[commit] r6189 - in freeswitch/trunk: build conf src src/include src/mod/applications/mod_commands src/mod/applications/mod_expr - Freeswitch-svn

8 Nov 2007

Author: anthm
Date: Thu Nov  8 18:46:26 2007
New Revision: 6189

Added:
   freeswitch/trunk/src/mod/applications/mod_expr/
   freeswitch/trunk/src/mod/applications/mod_expr/Makefile
   freeswitch/trunk/src/mod/applications/mod_expr/conio.h
   freeswitch/trunk/src/mod/applications/mod_expr/exprconf.h
   freeswitch/trunk/src/mod/applications/mod_expr/expreval.c
   freeswitch/trunk/src/mod/applications/mod_expr/expreval.dsp
   freeswitch/trunk/src/mod/applications/mod_expr/expreval.dsw
   freeswitch/trunk/src/mod/applications/mod_expr/expreval.h
   freeswitch/trunk/src/mod/applications/mod_expr/expreval.html
   freeswitch/trunk/src/mod/applications/mod_expr/exprfunc.c
   freeswitch/trunk/src/mod/applications/mod_expr/exprilfs.h
   freeswitch/trunk/src/mod/applications/mod_expr/exprincl.h
   freeswitch/trunk/src/mod/applications/mod_expr/exprinit.c
   freeswitch/trunk/src/mod/applications/mod_expr/exprmem.c
   freeswitch/trunk/src/mod/applications/mod_expr/exprmem.h
   freeswitch/trunk/src/mod/applications/mod_expr/exprobj.c
   freeswitch/trunk/src/mod/applications/mod_expr/exprpars.c
   freeswitch/trunk/src/mod/applications/mod_expr/exprpriv.h
   freeswitch/trunk/src/mod/applications/mod_expr/exprtmpl.html
   freeswitch/trunk/src/mod/applications/mod_expr/exprutil.c
   freeswitch/trunk/src/mod/applications/mod_expr/exprval.c
   freeswitch/trunk/src/mod/applications/mod_expr/license.txt
   freeswitch/trunk/src/mod/applications/mod_expr/mod_expr.c
   freeswitch/trunk/src/mod/applications/mod_expr/readme.txt
Modified:
   freeswitch/trunk/build/modules.conf.in
   freeswitch/trunk/conf/modules.conf.xml
   freeswitch/trunk/src/include/switch_utils.h
   freeswitch/trunk/src/mod/applications/mod_commands/mod_commands.c
   freeswitch/trunk/src/switch_channel.c
   freeswitch/trunk/src/switch_utils.c

Log:
add some logic tools

Modified: freeswitch/trunk/build/modules.conf.in
==============================================================================

--- freeswitch/trunk/build/modules.conf.in	(original)
+++ freeswitch/trunk/build/modules.conf.in	Thu Nov  8 18:46:26 2007
@@ -7,6 +7,7 @@
 applications/mod_fifo
 applications/mod_voicemail
 applications/mod_limit
+applications/mod_expr
 #applications/mod_ivrtest
 #applications/mod_soundtouch
 #applications/mod_rss

Modified: freeswitch/trunk/conf/modules.conf.xml
==============================================================================
--- freeswitch/trunk/conf/modules.conf.xml	(original)
+++ freeswitch/trunk/conf/modules.conf.xml	Thu Nov  8 18:46:26 2007
@@ -36,6 +36,7 @@
     <load module="mod_commands"/>
     <load module="mod_conference"/>
     <load module="mod_dptools"/>
+    <load module="mod_expr"/>
     <load module="mod_fifo"/>
     <load module="mod_voicemail"/>
     <load module="mod_limit"/>

Modified: freeswitch/trunk/src/include/switch_utils.h
==============================================================================
--- freeswitch/trunk/src/include/switch_utils.h	(original)
+++ freeswitch/trunk/src/include/switch_utils.h	Thu Nov  8 18:46:26 2007
@@ -298,7 +298,10 @@
 */
 SWITCH_DECLARE(unsigned int) switch_separate_string(char *buf, char delim, char **array, int arraylen);
 
+SWITCH_DECLARE(switch_bool_t) switch_is_number(const char *str);
+SWITCH_DECLARE(char *) switch_strip_spaces(const char *str);
 SWITCH_DECLARE(const char *) switch_stristr(const char *str, const char *instr);
+SWITCH_DECLARE(switch_bool_t) switch_is_lan_addr(const char *ip);
 
 /*!
   \brief Escape a string by prefixing a list of characters with an escape character

Modified: freeswitch/trunk/src/mod/applications/mod_commands/mod_commands.c
==============================================================================
--- freeswitch/trunk/src/mod/applications/mod_commands/mod_commands.c	(original)
+++ freeswitch/trunk/src/mod/applications/mod_commands/mod_commands.c	Thu Nov  8 18:46:26 2007
@@ -40,6 +40,138 @@
 SWITCH_MODULE_LOAD_FUNCTION(mod_commands_load);
 SWITCH_MODULE_DEFINITION(mod_commands, mod_commands_load, NULL, NULL);
 
+
+typedef enum {
+    O_NONE,
+    O_EQ,
+    O_NE,
+    O_GT,
+    O_GE,
+    O_LT,
+    O_LE
+} o_t;
+
+SWITCH_STANDARD_API(qq_function)
+{
+    int argc;
+	char *mydata = NULL, *argv[3];
+    char *expr;
+    char *a, *b;
+    float a_f = 0.0, b_f = 0.0;
+    o_t o = O_NONE;
+    int is_true = 0;
+    char *p;
+
+    if (!cmd) {
+        goto error;
+    }
+
+    mydata = strdup(cmd);
+    assert(mydata);
+
+    if ((p = strchr(mydata, '?'))) {
+        *p = ':';
+    } else {
+        goto error;
+    }
+
+    argc = switch_separate_string(mydata, ':', argv, (sizeof(argv) / sizeof(argv[0])));
+
+    if (argc != 3) {
+        goto error;
+    }
+
+    a = argv[0];
+    
+    if ((expr = strchr(a, '!'))) {
+        *expr++ = '\0';
+        if (*expr == '=') {
+            o = O_NE;
+        }
+    } else if ((expr = strchr(a, '>'))) {
+        if (*(expr+1) == '=') {
+            *expr++ = '\0';
+            o = O_GE;
+        } else {
+            o = O_GT;
+        }
+    } else if ((expr = strchr(a, '<'))) {
+        if (*(expr+1) == '=') {
+            *expr++ = '\0';
+            o = O_LE;
+        } else {
+            o = O_LT;
+        }
+    } else if ((expr = strchr(a, '='))) {
+        *expr++ = '\0';
+        if (*expr == '=') {
+            o = O_EQ;
+        }
+    }
+
+
+    if (o) {
+        char *s_a = NULL, *s_b = NULL;
+        int a_is_num, b_is_num;
+        *expr++ = '\0';
+        b = expr;
+        s_a = switch_strip_spaces(a);
+        s_b = switch_strip_spaces(b);
+        a_is_num = switch_is_number(s_a);
+        b_is_num = switch_is_number(s_b);
+
+        a_f = a_is_num ? atof(s_a) : (float) strlen(s_a);
+        b_f = b_is_num ? atof(s_b) : (float) strlen(s_b);
+        
+        switch (o) {
+        case O_EQ:
+            if (!a_is_num && !b_is_num) {
+                is_true = !strcmp(s_a, s_b);
+            } else {
+                is_true = a_f == b_f;
+            }
+            break;
+        case O_NE:
+            is_true = a_f != b_f;
+            break;
+        case O_GT:
+            is_true = a_f > b_f;
+            break;
+        case O_GE:
+            is_true = a_f >= b_f;
+            break;
+        case O_LT:
+            is_true = a_f < b_f;
+            break;
+        case O_LE:
+            is_true = a_f <= b_f;
+            break;
+        default:
+            break;
+        }
+        switch_safe_free(s_a);
+        switch_safe_free(s_b);
+        stream->write_function(stream, "%s", is_true ? argv[1] : argv[2]);
+        goto ok;
+    } 
+
+ error:
+    stream->write_function(stream, "!err!");    
+ ok:
+
+    switch_safe_free(mydata);
+    return SWITCH_STATUS_SUCCESS;
+    
+    
+}
+
+
+SWITCH_STANDARD_API(lan_addr_function)
+{
+	stream->write_function(stream, "%s", switch_is_lan_addr(cmd) ? "yes" : "no");
+	return SWITCH_STATUS_SUCCESS;
+}
+
 SWITCH_STANDARD_API(status_function)
 {
 	uint8_t html = 0;
@@ -1502,6 +1634,8 @@
 	SWITCH_ADD_API(commands_api_interface, "sched_api", "Schedule an api command", sched_api_function, "[+]<time> <group_name> <command_string>");
 	SWITCH_ADD_API(commands_api_interface, "sched_del", "Delete a Scheduled task", sched_del_function, "<task_id>|<group_id>");
 	SWITCH_ADD_API(commands_api_interface, "xml_wrap", "Wrap another api command in xml", xml_wrap_api_function, "<command> <args>");
+	SWITCH_ADD_API(commands_api_interface, "is_lan_addr", "see if an ip is a lan addr", lan_addr_function, "<ip>");
+	SWITCH_ADD_API(commands_api_interface, "qq", "Eval a conditional", qq_function, "<expr> ? <true val> : <false val>");
 
 	/* indicate that the module should continue to be loaded */
 	return SWITCH_STATUS_NOUNLOAD;

Added: freeswitch/trunk/src/mod/applications/mod_expr/Makefile
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/Makefile	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,6 @@
+BASE=../../../..
+LOCAL_SOURCES=expreval.c exprinit.c exprobj.c exprutil.c exprfunc.c exprmem.c exprpars.c exprval.c
+LOCAL_OBJS=expreval.o exprinit.o exprobj.o exprutil.o exprfunc.o exprmem.o exprpars.o exprval.o
+LOCAL_LIBADD=-lm
+include $(BASE)/build/modmake.rules
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/conio.h
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/conio.h	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,161 @@
+/* A conio implementation for Mingw/Dev-C++.
+ *
+ * Written by:
+ * Hongli Lai <hongli@telekabel.nl>
+ * tkorrovi <tkorrovi@altavista.net> on 2002/02/26. 
+ * Andrew Westcott <ajwestco@users.sourceforge.net>
+ *
+ * Offered for use in the public domain without any warranty.
+ */
+
+#ifndef _CONIO_H_
+#define _CONIO_H_
+
+
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define BLINK 0
+
+typedef enum
+{
+    BLACK,
+    BLUE,
+    GREEN,
+    CYAN,
+    RED,
+    MAGENTA,
+    BROWN,
+    LIGHTGRAY,
+    DARKGRAY,
+    LIGHTBLUE,
+    LIGHTGREEN,
+    LIGHTCYAN,
+    LIGHTRED,
+    LIGHTMAGENTA,
+    YELLOW,
+    WHITE
+} COLORS;
+
+
+#define cgets	_cgets
+#define cprintf	_cprintf
+#define cputs	_cputs
+#define cscanf	_cscanf
+#define ScreenClear clrscr
+
+/* blinkvideo */
+
+void clreol (void);
+void clrscr (void);
+
+int _conio_gettext (int left, int top, int right, int bottom,
+                    char *str);
+/* _conio_kbhit */
+
+void delline (void);
+
+/* gettextinfo */
+void gotoxy(int x, int y);
+/*
+highvideo
+insline
+intensevideo
+lowvideo
+movetext
+normvideo
+*/
+
+void gotoxy(int x, int y);
+
+void puttext (int left, int top, int right, int bottom, char *str);
+
+// Screen Variables
+
+/* ScreenCols
+ScreenGetChar
+ScreenGetCursor
+ScreenMode
+ScreenPutChar
+ScreenPutString
+ScreenRetrieve
+ScreenRows
+ScreenSetCursor
+ScreenUpdate
+ScreenUpdateLine
+ScreenVisualBell
+_set_screen_lines */
+
+void _setcursortype (int type);
+
+void textattr (int _attr);
+
+void textbackground (int color);
+
+void textcolor (int color);
+
+/* textmode */
+
+int wherex (void);
+
+int wherey (void);
+
+/* window */
+
+
+
+/*  The code below was part of Mingw's conio.h  */
+/*
+ * conio.h
+ *
+ * Low level console I/O functions. Pretty please try to use the ANSI
+ * standard ones if you are writing new code.
+ *
+ * This file is part of the Mingw32 package.
+ *
+ * Contributors:
+ *  Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
+ *
+ *  THIS SOFTWARE IS NOT COPYRIGHTED
+ *
+ *  This source code is offered for use in the public domain. You may
+ *  use, modify or distribute it freely.
+ *
+ *  This code is distributed in the hope that it will be useful but
+ *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
+ *  DISCLAMED. This includes but is not limited to warranties of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * $Revision: 1.4 $
+ * $Author: hongli $
+ * $Date: 2002/04/26 19:31:25 $
+ *
+ */
+
+char*	_cgets (char*);
+int	_cprintf (const char*, ...);
+int	_cputs (const char*);
+int	_cscanf (char*, ...);
+
+int	_getch (void);
+int	_getche (void);
+int	_kbhit (void);
+int	_putch (int);
+int	_ungetch (int);
+
+
+int	getch (void);
+int	getche (void);
+int	kbhit (void);
+int	putch (int);
+int	ungetch (int);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _CONIO_H_ */

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprconf.h
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprconf.h	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,29 @@
+/*
+    File: exprconf.h
+    Auth: Brian Allen Vanderburg II
+    Date: Thursday, October 20, 2005
+    Desc: Configuration for ExprEval
+
+    This file is part of ExprEval.
+*/
+
+#ifndef __BAVII_EXPRCONF_H
+#define __BAVII_EXPRCONF_H
+
+/*
+    Error checking level
+
+    0: Don't check any errors (don't use errno).  Divide by 0
+    is avoided and the part that divides by 0 is 0. For example
+    '4+1/0' is 4.
+
+    1: Check math errors.
+*/
+#define EXPR_ERROR_LEVEL_NONE 0
+#define EXPR_ERROR_LEVEL_CHECK 1
+
+#ifndef EXPR_ERROR_LEVEL
+#define EXPR_ERROR_LEVEL EXPR_ERROR_LEVEL_CHECK
+#endif
+
+#endif /* __BAVII_EXPRCONF_H */

Added: freeswitch/trunk/src/mod/applications/mod_expr/expreval.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/expreval.c	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,268 @@
+/*
+    File: expreval.c
+    Auth: Brian Allen Vanderburg II
+    Date: Wednesday, April 30, 2003
+    Desc: Evaluation routines for the ExprEval library
+
+    This file is part of ExprEval.
+*/
+
+/* Includes */
+#include "exprincl.h"
+
+#include "exprpriv.h"
+
+/* Defines for error checking */
+#include <errno.h>
+
+#if(EXPR_ERROR_LEVEL >= EXPR_ERROR_LEVEL_CHECK)
+#define EXPR_RESET_ERR() errno = 0
+#define EXPR_CHECK_ERR() if(errno) return EXPR_ERROR_OUTOFRANGE
+#else
+#define EXPR_RESET_ERR()
+#define EXPR_CHECK_ERR()
+#endif
+
+
+/* This routine will evaluate an expression */
+int exprEval(exprObj *obj, EXPRTYPE *val)
+    {
+    EXPRTYPE dummy;
+
+    if(val ==  NULL)
+        val = &dummy;
+
+    /* Make sure it was parsed successfully */
+    if(!obj->parsedbad && obj->parsedgood && obj->headnode)
+        {
+        /* Do NOT reset the break count.  Let is accumulate
+           between calls until breaker function is called */
+        return exprEvalNode(obj, obj->headnode, 0, val);
+        }
+    else
+        return EXPR_ERROR_BADEXPR;
+    }
+
+/* Evaluate a node */
+int exprEvalNode(exprObj *obj, exprNode *nodes, int curnode, EXPRTYPE *val)
+    {
+    int err;
+    int pos;
+    EXPRTYPE d1, d2;
+
+    if(obj == NULL || nodes == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    /* Update n to point to correct node */
+    nodes += curnode;
+
+    /* Check breaker count */
+    if(obj->breakcur-- <= 0)
+        {
+        /* Reset count before returning */
+        obj->breakcur = obj->breakcount;
+                
+        if(exprGetBreakResult(obj))
+            {
+            return EXPR_ERROR_BREAK;
+            }
+        }
+
+    switch(nodes->type)
+        {
+        case EXPR_NODETYPE_MULTI:
+            {
+            /* Multi for multiple expressions in one string */
+            for(pos = 0; pos < nodes->data.oper.nodecount; pos++)
+                {
+                err = exprEvalNode(obj, nodes->data.oper.nodes, pos, val);
+                if(err)
+                    return err;
+                }
+            break;
+            }
+
+        case EXPR_NODETYPE_ADD:
+            {
+            /* Addition */
+            err = exprEvalNode(obj, nodes->data.oper.nodes, 0, &d1);
+
+            if(!err)
+                err = exprEvalNode(obj, nodes->data.oper.nodes, 1, &d2);
+
+            if(!err)
+                *val = d1 + d2;
+            else
+                return err;
+
+            break;
+            }
+
+        case EXPR_NODETYPE_SUBTRACT:
+            {
+            /* Subtraction */
+            err = exprEvalNode(obj, nodes->data.oper.nodes, 0, &d1);
+            
+            if(!err)
+                err = exprEvalNode(obj, nodes->data.oper.nodes, 1, &d2);
+
+            if(!err)
+                *val = d1 - d2;
+            else
+                return err;
+
+            break;
+            }
+
+        case EXPR_NODETYPE_MULTIPLY:
+            {
+            /* Multiplication */
+            err = exprEvalNode(obj, nodes->data.oper.nodes, 0, &d1);
+
+            if(!err)
+                err = exprEvalNode(obj, nodes->data.oper.nodes, 1, &d2);
+
+            if(!err)
+                *val = d1 * d2;
+            else
+                return err;
+
+            break;
+            }
+
+        case EXPR_NODETYPE_DIVIDE:
+            {
+            /* Division */
+            err = exprEvalNode(obj, nodes->data.oper.nodes, 0, &d1);
+
+            if(!err)
+                err = exprEvalNode(obj, nodes->data.oper.nodes, 1, &d2);
+
+            if(!err)
+                {
+                if(d2 != 0.0)
+                    *val = d1 / d2;
+                else
+                    {
+#if(EXPR_ERROR_LEVEL >= EXPR_ERROR_LEVEL_CHECK)
+                    return EXPR_ERROR_DIVBYZERO;
+#else
+                    *val = 0.0;
+                    return EXPR_ERROR_NOERROR;
+#endif
+                    }
+                }
+            else
+                return err;
+
+            break;
+            }
+
+        case EXPR_NODETYPE_EXPONENT:
+            {
+            /* Exponent */
+            err = exprEvalNode(obj, nodes->data.oper.nodes, 0, &d1);
+
+            if(!err)
+                err = exprEvalNode(obj, nodes->data.oper.nodes, 1, &d2);
+
+            if(!err)
+                {
+                EXPR_RESET_ERR();
+                *val = pow(d1, d2);
+                EXPR_CHECK_ERR();
+                }
+            else
+                return err;
+
+            break;
+            }
+
+        case EXPR_NODETYPE_NEGATE:
+            {
+            /* Negative value */
+            err = exprEvalNode(obj, nodes->data.oper.nodes, 0, &d1);
+
+            if(!err)
+                *val = -d1;
+            else
+                return err;
+           
+            break;
+            }
+
+
+        case EXPR_NODETYPE_VALUE:
+            {
+            /* Directly access the value */
+            *val = nodes->data.value.value;
+            break;
+            }
+
+        case EXPR_NODETYPE_VARIABLE:
+            {
+            /* Directly access the variable or constant */
+            *val = *(nodes->data.variable.vaddr);
+            break;
+            }
+
+        case EXPR_NODETYPE_ASSIGN:
+            {
+            /* Evaluate assignment subnode */
+            err = exprEvalNode(obj, nodes->data.assign.node, 0, val);
+
+            if(!err)
+                {
+                /* Directly assign the variable */
+                *(nodes->data.assign.vaddr) = *val;
+                }
+            else
+                return err;
+            
+            break;
+            }
+
+        case EXPR_NODETYPE_FUNCTION:
+            {
+            /* Evaluate the function */
+            if(nodes->data.function.fptr == NULL)
+                {
+                /* No function pointer means we are not using
+                   function solvers.  See if the function has a
+                   type to solve directly. */
+                switch(nodes->data.function.type)
+                    {
+                    /* This is to keep the file from being too crowded.
+                       See exprilfs.h for the definitions. */
+#include "exprilfs.h"
+                   
+
+                    default:
+                        {
+                        return EXPR_ERROR_UNKNOWN;
+                        }
+                    }
+                }
+            else
+                {
+                /* Call the correct function */
+                return (*(nodes->data.function.fptr))(obj,
+                    nodes->data.function.nodes, nodes->data.function.nodecount,
+                    nodes->data.function.refs, nodes->data.function.refcount, val);
+                }
+
+            break;
+            }
+
+        default:
+            {
+            /* Unknown node type */
+            return EXPR_ERROR_UNKNOWN;
+            }
+        }
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/expreval.dsp
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/expreval.dsp	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,164 @@
+# Microsoft Developer Studio Project File - Name="expreval" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Static Library" 0x0104
+
+CFG=expreval - Win32 Debug
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "expreval.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "expreval.mak" CFG="expreval - Win32 Debug"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "expreval - Win32 Release" (based on "Win32 (x86) Static Library")
+!MESSAGE "expreval - Win32 Debug" (based on "Win32 (x86) Static Library")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "expreval - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "Release"
+# PROP Intermediate_Dir "Release"
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_MBCS" /D "_LIB" /YX /FD /c
+# ADD CPP /nologo /G6 /MT /W3 /GX /O2 /Op /D "WIN32" /D "NDEBUG" /D "_MBCS" /D "_LIB" /YX /FD /c
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ELSEIF  "$(CFG)" == "expreval - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "Debug"
+# PROP Intermediate_Dir "Debug"
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_MBCS" /D "_LIB" /YX /FD /GZ /c
+# ADD CPP /nologo /G6 /MTd /Za /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_MBCS" /D "_LIB" /YX /FD /GZ /c
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ENDIF 
+
+# Begin Target
+
+# Name "expreval - Win32 Release"
+# Name "expreval - Win32 Debug"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=.\expreval.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprfunc.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprinit.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprmem.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprobj.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprpars.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprutil.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprval.c
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# Begin Source File
+
+SOURCE=.\exprconf.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\expreval.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprilfs.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprincl.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprmem.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprpriv.h
+# End Source File
+# End Group
+# Begin Source File
+
+SOURCE=.\expreval.html
+# End Source File
+# Begin Source File
+
+SOURCE=.\exprtmpl.html
+# End Source File
+# Begin Source File
+
+SOURCE=.\license.txt
+# End Source File
+# Begin Source File
+
+SOURCE=.\readme.txt
+# End Source File
+# End Target
+# End Project

Added: freeswitch/trunk/src/mod/applications/mod_expr/expreval.dsw
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/expreval.dsw	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,59 @@
+Microsoft Developer Studio Workspace File, Format Version 6.00
+# WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE!
+
+###############################################################################
+
+Project: "expreval"=.\expreval.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+}}}
+
+###############################################################################
+
+Project: "imagegen"=.\imagegen\imagegen.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+    Begin Project Dependency
+    Project_Dep_Name expreval
+    End Project Dependency
+}}}
+
+###############################################################################
+
+Project: "test"=.\test\test.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+    Begin Project Dependency
+    Project_Dep_Name expreval
+    End Project Dependency
+}}}
+
+###############################################################################
+
+Global:
+
+Package=<5>
+{{{
+}}}
+
+Package=<3>
+{{{
+}}}
+
+###############################################################################
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/expreval.h
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/expreval.h	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,127 @@
+/*
+    File: expreval.h
+    Auth: Brian Allen Vanderburg II
+    Date: Thursday, April 24, 2003
+    Desc: Main include file for ExprEval library
+
+    This file is part of ExprEval.
+*/
+
+
+/* Include once */
+#ifndef __BAVII_EXPREVAL_H
+#define __BAVII_EXPREVAL_H
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Define type of data to use */
+typedef double EXPRTYPE;
+
+/* Defines for various things */
+
+/* Max id size */
+#define EXPR_MAXIDENTSIZE 255
+
+/* Error values */
+enum
+    {
+    EXPR_ERROR_UNKNOWN = -1, /* Unknown error */
+    EXPR_ERROR_NOERROR = 0, /* No Error */
+    EXPR_ERROR_MEMORY, /* Memory allocation failed */
+    EXPR_ERROR_NULLPOINTER, /* Null pointer passed to function */
+    EXPR_ERROR_NOTFOUND, /* Item not found in a list */
+    EXPR_ERROR_UNMATCHEDCOMMENT, /* Unmatched comment tags */
+    EXPR_ERROR_INVALIDCHAR, /* Invalid characters in expression */
+    EXPR_ERROR_ALREADYEXISTS, /* An item already called create */
+    EXPR_ERROR_ALREADYPARSEDBAD, /* Expression parsed already, but unsuccessfully. call free or clear */
+    EXPR_ERROR_ALREADYPARSEDGOOD, /* Expression parsed already, successfully, call free or clear */
+    EXPR_ERROR_EMPTYEXPR, /* Empty expression string passed to parse */
+    EXPR_ERROR_UNMATCHEDPAREN, /* Unmatched parenthesis */
+    EXPR_ERROR_SYNTAX, /* Syntax error in expression */
+    EXPR_ERROR_MISSINGSEMICOLON, /* Missing semicolon at end of expression */
+    EXPR_ERROR_BADIDENTIFIER, /* Identifier was to big or not formed right */
+    EXPR_ERROR_NOSUCHFUNCTION, /* Function does not exist in function list */
+    EXPR_ERROR_BADNUMBERARGUMENTS, /* Bad number of arguments in a function call */
+    EXPR_ERROR_BADEXPR, /* This is a bad expression to evaluate. It has not been parsed or has unsuccessfully */
+    EXPR_ERROR_UNABLETOASSIGN, /* Unable to do an assignment, maybe no variable list */
+    EXPR_ERROR_DIVBYZERO, /* Attempted a division by zero */
+    EXPR_ERROR_NOVARLIST, /* No variable list found but one is needed */
+    EXPR_ERROR_BREAK, /* Expression was broken by break function */
+    EXPR_ERROR_CONSTANTASSIGN, /* Assignment to a constant */
+    EXPR_ERROR_REFCONSTANT, /* Constant used as a reference parameter */
+    EXPR_ERROR_OUTOFRANGE, /* A bad value was passed to a function */
+
+    EXPR_ERROR_USER /* Custom errors should be larger than this */
+    };
+
+/* Macros */
+
+/* Forward declarations */
+typedef struct _exprNode exprNode;
+typedef struct _exprFuncList exprFuncList;
+typedef struct _exprValList exprValList;
+typedef struct _exprObj exprObj;
+
+/* Function types */
+typedef int (*exprFuncType)(exprObj *obj, exprNode *nodes, int nodecount, EXPRTYPE **refs, int refcount, EXPRTYPE *val);
+typedef int (*exprBreakFuncType)(exprObj *obj);
+
+
+
+/* Functions */
+
+/* Version information function */
+void exprGetVersion(int *major, int *minor);
+
+/* Functions for function lists */
+int exprFuncListCreate(exprFuncList **flist);
+int exprFuncListAdd(exprFuncList *flist, char *name, exprFuncType ptr, int min, int max, int refmin, int refmax);
+int exprFuncListFree(exprFuncList *flist);
+int exprFuncListClear(exprFuncList *flist);
+int exprFuncListInit(exprFuncList *flist);
+
+/* Functions for value lists */
+int exprValListCreate(exprValList **vlist);
+int exprValListAdd(exprValList *vlist, char *name, EXPRTYPE val);
+int exprValListSet(exprValList *vlist, char *name, EXPRTYPE val);
+int exprValListGet(exprValList *vlist, char *name, EXPRTYPE *val);
+int exprValListAddAddress(exprValList *vlist, char *name, EXPRTYPE *addr);
+int exprValListGetAddress(exprValList *vlist, char *name, EXPRTYPE **addr);
+void *exprValListGetNext(exprValList *vlist, char **name, EXPRTYPE *value, EXPRTYPE** addr, void *cookie);
+int exprValListFree(exprValList *vlist);
+int exprValListClear(exprValList *vlist);
+int exprValListInit(exprValList *vlist);
+
+/* Functions for expression objects */
+int exprCreate(exprObj **obj, exprFuncList *flist, exprValList *vlist, exprValList *clist,
+    exprBreakFuncType breaker, void *userdata);
+int exprFree(exprObj *obj);
+int exprClear(exprObj *obj);
+int exprParse(exprObj *obj, char *expr);
+int exprEval(exprObj *obj, EXPRTYPE *val);
+int exprEvalNode(exprObj *obj, exprNode *nodes, int curnode, EXPRTYPE *val);
+exprFuncList *exprGetFuncList(exprObj *obj);
+exprValList *exprGetVarList(exprObj *obj);
+exprValList *exprGetConstList(exprObj *obj);
+exprBreakFuncType exprGetBreakFunc(exprObj *obj);
+int exprGetBreakResult(exprObj *obj);
+void* exprGetUserData(exprObj *obj);
+void exprSetUserData(exprObj *obj, void *userdata);
+void exprSetBreakCount(exprObj *obj, int count);
+void exprGetErrorPosition(exprObj *obj, int *start, int *end);
+
+/* Other useful routines */
+int exprValidIdent(char *name);
+
+/* Name mangling */
+#ifdef __cplusplus
+}
+#endif
+
+
+
+#endif /* __BAVII_EXPREVAL_H */

Added: freeswitch/trunk/src/mod/applications/mod_expr/expreval.html
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/expreval.html	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,1334 @@
+<html>
+<head>
+<title>ExprEval Library</title>
+<style type="text/css">
+.valid {
+  color: #00AA00;
+}
+.invalid {
+  color: #FF0000;
+}
+.excomment {
+  color: #0000FF;
+}
+.container {
+  margin-top: 10px;
+  margin-bottom: 10px;
+  padding-left: 4px;
+  padding-right: 4px;
+  border-top: 1px solid #000000;
+  border-right: 1px solid #000000;
+  border-bottom: 1px solid #000000;
+  border-left: 1px solid #000000;
+  background-color: #BBBBBB;
+}
+body {
+  background-color: #AAAAAA;
+}
+</style>
+</head>
+<body>
+
+<div align="center">
+    <h1>ExprEval Library</h1>
+    <hr>
+</div>
+
+<div align="left" class="container">
+    <h2>Contents</h2>
+    <h3>
+        <ul>
+            <a href="#Introduction">Introduction</a><br>
+            <a href="#License">License</a><br>
+            <a href="#Syntax">Expression Syntax</a><br>
+            <a href="#Using">Using ExprEval in an Application</a><br>
+            <a href="#FastVar">Fast Variable Access</a><br>
+            <a href="#InternalFuncConst">Using the Internal Functions and Constants</a><br>
+            <a href="#CustomFunc">Creating Custom Functions</a><br>
+            <a href="#Reference">Reference</a><br>
+            <a href="#Compiling">Compiling the ExprEval Library</a><br>
+            <a href="#Drawbacks">Drawbacks/Problems</a><br>
+            <a href="#Solutions">Problems and Solutions</a><br>
+            <a href="#Example">Example Use</a><br>
+        </ul>
+    </h3>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Introduction">Introduction</a></h2>
+    <blockquote>
+        <p>ExprEval Help document.  This document is probably full of
+            bugs and mispellings.  I may get around to proofreading
+            it later.</p>
+        <p>ExprEval is a C based expression evaluation library.
+            It is entirely C based, but can be used in C++ programs
+            as well..  The source code is provided for the library
+            so that it can be recompiled for the specific system
+            or compiler.</p>
+        <p>ExprEval makes adding mathematical expression support to
+            an application easy.  It takes an expression string and
+            parses it, and then it can evaluate it over and over.
+            This library also has support for functions, constants,
+            and variables.  All of these items are stored in
+            seperate lists so they can be shared among expressions or
+            they can be private to a single expression or any mix and
+            match.  It is up to the developer how to link them together.
+            You can also create your own custom functions.</p>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="License">License</a></h2>
+    <blockquote>
+        <p>This library is licensed under the
+        <a href="license.txt">ExprEval License.</a>
+        </p>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Syntax">Expression Syntax</a></h2>
+    <blockquote>
+        <p>Expressions have pretty much the same syntax as they
+            would have on paper, with the following exceptions:
+            <ul>
+                <li>Each expression must end with a semicolon. This
+                    is because the expression string can actually
+                    contain multiple expressions.  The semicolon is
+                    used to mark the end of the expression.<br>
+                    <b>Examples:</b>
+                    <ul>
+                        <li>4*x+5;</li>
+                        <li>y=5+2;g=4+6;</li>
+                        <li>y=r*sin(a);x=r*cos(a);</li>
+                    </ul>
+                </li>
+                <li>The asterisk '*' must be used to multiply.<br>
+                    <b>Examples:</b>
+                    <ul>
+                        <li>y=5*6; <b class="valid">Valid</b></li>
+                        <li>g=(x+1)*(x-1); <b class="valid">Valid</b></li>
+                        <li>g=(x+1)(x-1); <b class="invalid">Invalid</b></li>
+                    </ul>
+                </li>
+            </ul>
+        </p>
+        <p>More than one expression may be contained within an expression string.
+            As shown above, each expression must end with a semicolon, even if
+            only one expression is in the string. The value of an expression
+            string is the value of the last expression in the string.<br>
+            <b>Examlples:</b>
+            <ul>
+                <li>g=7; <b class="excomment">Value: 7</b></li>
+                <li>k=z+1; <b class="excomment">Value: z+1</b></li>
+                <li>r=4;k=6;o=9+r-k; <b class="excomment">Value: 9+r-k</b></li>
+            </ul>
+        </p>
+        <p>Some functions may take reference parameters.  These parameters are
+            references to other variables.  You can mix reference parameters
+            with normal parameters.  The order of the normal parameters must
+            remain the same and the order of the reference parameters must
+            remain the same.<br>
+            <b>Examples:</b>
+            <ul>
+                <li>min(1,2,3,4,&mval); <b class="excomment">&mval is a reference to a variable mval</b></li>
+                <li>min(1,2,&mval,3,4); <b class="excomment">You may mix them inside like this.</b></li>
+                <li>min(1,2,(&mval),3,4); <b class="invalid">You may not nest reference parameters in any way</b></li>
+            </ul>
+        </p>
+        <p>Expressions may also be nested with parenthesis.<br>
+        <b>Examples:</b>
+            <ul>
+                <li>y=sin(x-cos(5+max(4,5,6*x)));</li>
+                <li>6+(5-2*(x+y));</li>
+            </ul>
+        </p>
+        <p>Expressions may also have whitespace characters and comments.
+            Whitespace characters such as newlines, linefeeds, carriage
+            returns, spaces, and tabs are ignored.  Comments begin with
+            the pound sign '#' and end at the end of the line.<br>
+            <b>Example:</b>
+            <ul>
+                <pre>
+#Set the x value
+x = d * cos(r);
+
+#Set the y value
+y = d * sin(r);
+                </pre>
+            </ul>
+        </p>
+        <p>If a variable is used in an expression, but that variable does not exist,
+            it is considered zero.  If it does exist then its value is used instead.
+        </p>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Using">Using ExprEval in an Application</a></h2>
+    <blockquote>
+        <p>Using ExprEval in an application can be a little difficult.
+            You generally follow these steps:
+            <ul>
+                <li>Create function, variable, and constant lists</li>
+                <li>Create the expression object</li>
+                <li>Parse the expression</li>
+                <li>Evaluate the expression as needed</li>
+                <li>Free the expression object</li>
+                <li>Free the function, variable, and constant lists</li>
+            </ul>
+            You can manipulate the lists in any order after their creation.
+            However, functions are translated during the parse, so after
+            parsing an expression, manipulating the function list will make
+            no change to an expression.  Variables and constants can be
+            manipulated after a parse to change the result of an expression.
+            However, you must add any constants to be used by an expression
+            to the constant list <b>BEFORE</b> parsing the expression,
+            otherwise it will be seen as a variable.  Applications can change
+            both variables and constants, however the expression can only
+            change variables.  Expressions may <b>NOT</b> assign to a constant
+            and expressions may <b>NOT</b> use constants as a reference parameter.</p>
+        <p><b>Function, variable, and constant list example:</b>
+            <ul>
+                <pre>
+exprFuncList *flist;
+exprValList *vlist;
+exprValList *clist;
+exprObj *obj;
+EXPRTYPE result;
+int err;
+
+/* Create function list */
+err = exprFuncListCreate(&flist);
+if(err != EXPR_ERROR_NOERROR)
+    {
+    ...
+    }
+
+/* Initialize internal functions */
+err = exprFuncListInit(flist);
+if(err != EXPR_ERROR_NOERROR)
+    {
+    ...
+    }
+
+/* Create variable list */
+err = exprValListCreate(&vlist);
+if(err != EXPR_ERROR_NOERROR)
+    {
+    ...
+    }
+
+/* Create the constant list */
+err = exprValListCreate(&clist);
+if(err != EXPR_ERROR_NOERROR)
+    {
+    ...
+    }
+
+/* Initialize internal constants */
+err = exprValListInit(clist);
+if(err != EXPR_ERROR_NOERROR)
+    {
+    ...
+    }
+
+/* Add any application defined functions, constants, or variables to the lists here or down below */
+                </pre>
+            </ul>
+        </p>
+        <p><b>Expression object example:</b>
+            <ul>
+                <pre>
+err = exprCreate(&obj, flist, vlist, clist, NULL, 0);
+if(err != EXPR_ERROR_NOERROR)
+    {
+    ...
+    }
+
+/* Add any application defined functions, constants, or variables to the lists here or down below.
+   This is the last time you can for the functions or constants. */
+                </pre>
+            </ul>
+        </p>
+        <p><b>Expression parse example:</b>
+            <ul>
+                <pre>
+/* Functions and constants may be added or changed here */
+
+err = exprParse(obj, "2+sin(M_PI)+3*x;");
+if(err != EXPR_ERROR_NOERROR)
+    {
+    ...
+    }
+
+/* Changes to the function or constant lists do not change the expression now */
+                </pre>
+            </ul>
+        </p>
+        <p><b>Expression evaluation example:</b>
+            <ul>
+                <pre>
+/* Add or change any variables */
+
+err = exprEval(obj, &result);
+if(err != EXPR_ERROR_NOERRO)
+    {
+    ...
+    }
+else
+    {
+    printf("Expression Result: %f\n", result);
+    }
+                </pre>
+            </ul>
+        </p>
+        <p><b>Free the expression object and lists example:</b>
+            <ul>
+                <pre>
+exprFree(obj);
+exprValListFree(vlist);
+exprValListFree(clist);
+exprFuncListFree(flist);
+                </pre>
+            </ul>
+        </p>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="FastVar">Fast Variable Access</a></h2>
+    <blockquote>
+        <p>A new feature in ExprEval is fast variable access.  This
+            is simply a technique of quickly accessing variables
+            by directly accessing their memory locations instead
+            of using the value list functions.  Fast variable access
+            is always used internally in ExprEval.  You must
+            NOT clear a variable list until after all expressions
+            using it are completely finished evaluating.  Then you
+            must reparse the expressions before using them again.
+            The reason is simple. When fast variable access is used,
+            the variable memory location is directly accessed If you
+            clear a variable list and then evaluate an expression,
+            it will access invalid memory.</p>
+        <p>You can also use fast variable access in you application
+            to dramatically speed up loops.  This is accomplished as
+            follows:
+            <ul>
+                <li>Add the desired variable to the variable list</li>
+                <li>Get the address of the variable with exprValListGetAddress</li>
+                <li>In the loop(s), directly set/get the variable any time needed: *var = 0.0;</li>
+            </ul>
+        </p>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="InternalFuncConst">Using the Internal Functions and Constants</a></h2>
+    <blockquote>
+        <p>To use the internal functions, they must first be initialized
+            into a function list with exprFuncListInit.  To use the
+            internal constants, they must first be initialized into a
+            value list with exprValListInit.  For a list of the
+            internal functions and constants, see the application
+            help template file: <a href="exprtmpl.html">ExprTmpl.html</a>
+            You may use this file in your own applications so you don't
+            have to write a detail on the functions in ExprEval.  All
+            you have to do is add you own functions and constants to
+            the file if there are any.
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="CustomFunc">Creating Custom Functions</a></h2>
+    <blockquote>
+        <p>Custom functions can be created for use by the library.
+            This is how a function should look
+            <ul>
+                <pre>
+int custom_func(exprObj *obj, exprNode *nodes, int nodecount, EXPRTYPE **refs, int refcount, EXPRTYPE *val)
+    {
+    }
+                </pre>
+            </ul>
+
+            obj is a pointer to the expression object that called
+            the function, nodes is a pointer to an array of nodes
+            that are the parameters of this function, nodecount is
+            the number of items in the array (the number of parameters),
+            refs is an array of pointers to referenced variables,
+            refcount is the number of referenced variables,
+            and val is a pointer to a variable to recieve the result
+            of the function.  The function should return an error value
+            indicating the error status of the function.
+        </p>
+        <p>Solving a function typically goes as follows:
+            <ul>
+                <li>Verifiy the number of arguments, if needed</li>
+                <li>Evaluate the subnodes that you need.  You do not have to
+                    evaluate every subnode if you do not need it</li>
+                <li>Check for possible error conditions (division by zero)</li>
+                <li>Clear math errors (If function uses any math routines)</li>
+                <li>Calculate the result</li>
+                <li>Check for math errors (If the function uses any math routines)</li>
+                <li>return EXPR_ERROR_NOERROR</li>
+            </ul>
+        </p>
+        <p><b>Example:</b>
+            <ul>
+                <pre>
+int custom_func(exprObj *obj, exprNode *nodes, int count, EXPRTYPE **refs, int refcount, EXPRTYPE *val)
+    {
+    int err;
+    EXPRTYPE d1, d2;
+
+    /* Need 2 arguments */
+    if(nodecount != 2)
+        return EXPR_ERROR_BADNUMBERARGUMENTS;
+
+    /* Eval arg 1 */
+    err = exprEvalNode(obj, nodes, 0, &d1);
+    if(err != EXPR_ERROR_NOERROR)
+        return err;
+
+    /* Eval arg 2 */
+    err = exprEvalNode(obj, nodes, 1, &d2);
+    if(err != EXPR_ERROR_NOERROR)
+        return err;
+
+    /* Make sure arg 2 is not 0.0 */
+    if(d2 == 0.0)
+        {
+        *val = 0.0;
+        return EXPR_ERROR_NOERROR;
+        }
+
+    /* Do math */
+    *val = atan(d1 / d2); /* No need to worry about divide by zero */
+
+
+    return EXPR_ERROR_NOERROR;
+    }
+                </pre>
+            </ul>
+        </p>
+        <p>In order to use a custom function, it must be added to
+            a function list before the expression is parsed by using
+            exprFuncListAdd</p>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Reference">Reference</a></h2>
+    <blockquote>
+        <p><b>Headers:</b>
+            <ul>
+                <li>expreval.h - Include file</li>
+            </ul>
+        <p>
+        <p><b>Defines:</b>
+            <ul>
+                <li>EXPR_MAXIDENTSIZE - Maximum identifier, constant,
+                    or function name size</li>
+                <li>EXPR_ERROR_NOERROR - No error has occurred</li>
+                <li>EXPR_ERROR_MEMORY - A memory allocation error occured.
+                    For function and value lists, the name may have been
+                    invalid</li>
+                <li>EXPR_ERROR_NULLPOINTER - A null pointer was passed to
+                    a function that needed a valid pointer.</li>
+                <li>EXPR_ERROR_NOTFOUND - An item was not found in the
+                    function or value list</li>
+                <li>EXPR_ERROR_UNMATHEDCOMMENT - Comment is missing opening
+                    or closing mark.</li>
+                <li>EXPR_ERROR_INVALIDCHAR - Invalid characters were found
+                    in the expression</li>
+                <li>EXPR_ERROR_ALREADYEXISTS - An item already exists or created.</li>
+                <li>EXPR_ERROR_ALREADYPARSEDBAD - An expression was already
+                    parsed into this object, but unsuccessfully.  Free the
+                    expression before creating and parsing again</li>
+                <li>EXPR_ERROR_ALREADYPARSEDGOOD - An expression was already
+                    parsed into this object successfully.  Free the expression
+                    before creating and parsing again</li>
+                <li>EXPR_ERROR_EMPTYEXPR - An empty expression string was passed
+                    to be parsed</li>
+                <li>EXPR_ERROR_UNMATHEDPAREN - Unmathed opening or closing
+                    parenthesis were found</li>
+                <li>EXPR_ERROR_SYNTAX - A syntax error is in the expression</li>
+                <li>EXPR_ERROR_MISSINGSEMICOLON - An expression is missing a
+                    semicolon</li>
+                <li>EXPR_ERROR_BADIDENTIFIER - A bad identifier was used in
+                    the expression</li>
+                <li>EXPR_ERROR_NOSUCHFUNCTION - Function used in the expression
+                    does not exist in the function list</li>
+                <li>EXPR_ERROR_BADNUMBERARGUMENTS - A bad number of arguments
+                    was passed to the expression function</li>
+                <li>EXPR_ERROR_BADEXPR - Can not evaluate an expression because
+                    it does not exist or has not been parsed successfully.</li>
+                <li>EXPR_ERROR_UNABLETOASSIGN - Unable to do an assignment because
+                    a variable list has not been associated with the expression object</li>
+                <li>EXPR_ERROR_DIVBYZERO - An attemp to divide by zero has occured</li>
+                <li>EXPR_ERROR_NOVARLIST - No variable list for the expression</li>
+                <li>EXPR_ERROR_BREAK - The expression was broken by the break function</li>
+                <li>EXPR_ERROR_CONSTANTASSIGN - The expresion attempted to assign to a constant.</li>
+                <li>EXPR_ERROR_REFCONSTANT - The expression attempted to pass a constant as a
+                    reference parameter.</li>
+                <li>EXPR_ERROR_OUTOFRANGE - A bad value was passed to a function.</li>
+                <li>EXPR_ERROR_USER - Custom error values need to be larger than this.</li>
+            </ul>
+        </p>
+        <p><b>Objects:</b>
+            <ul>
+                <li>exprObj - The expression object</li>
+                <li>exprFuncList - A function lists for the expresions</li>
+                <li>exprValList - A value list for constants or variables</li>
+                <li>exprNode - An individual node in a parsed expression tree</li>
+            </ul>
+        </p>
+        <p><b>Types:</b>
+            <ul>
+                <li>EXPRTYPE - Type for the value of an expression (double)</li>
+                <li>exprFuncType - Custom function type. Defined as:<br>
+                typedef int (*exprFuncType)(exprObj *obj, exprNode *nodes, int nodecount, EXPRTYPE **refs, int refcount, EXPRTYPE *val);</li>
+                <li>exprBreakFuncType  - Breaker function pointer to stop evaluation if the result is nonzero.
+                    Defined as:<br>
+                    typedef int (*exprBreakFuncType)(exprObj *o);</li>
+            </ul>
+        </p>
+        <p><b>Version information functions:</b>
+            <ul>
+                <li>void exprGetVersion(int *major, int *mino);<br>
+                    Comments:
+                    <ul>
+                        <li>Gets the version of the ExprEval library</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*major - Pointer to int to get major version number</li>
+                        <li>*minor - Pointer to int to get minor version number</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Nothing</li>
+                    </ul>
+                </li>
+            </ul>
+        </p>
+        <p><b>Function list functions:</b>
+            <ul>
+                <li>int exprFuncListCreate(exprFuncList **flist);<br>
+                    Comments:
+                    <ul>
+                        <li>Creates a function lists and updates a pointer to point to it</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>**flist - Pointer to a pointer to the function list</li>
+                    </ul>
+                    Returns
+                    <ul>
+                        <li>Error code of the function.  On success, the pointer
+                            passed by address will point to the new function list</li>
+                    </ul>
+                </li><br>
+                <li>int exprFuncListAdd(exprFuncList *flist, exprFuncType ptr, char *name, int min, int max, int refmin, int refmax);<br>
+                    Comments:
+                    <ul>
+                        <li>Adds a function to the function list.  Returns error if
+                            the function already exists.</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*flist - Pointer to an already created function list</li>
+                        <li>ptr - Pointer to a custom function</li>
+                        <li>*name - Name of the custom function</li>
+                        <li>min - Minimum number of arguments for the function, negative for no minimum</li>
+                        <li>max - Maximum number of arguments for the function, negative for no maximum</li>
+                        <li>refmin - Minimum number of ref arguments</li>
+                        <li>refmax - Maxmimum number of ref arguments</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprFuncListFree(exprFuncList *flist);<br>
+                    Comments:
+                    <ul>
+                        <li>Free the function list entirely</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*flist - Pointer to the function list to free</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprFuncListClear(exprFuncList *flist);<br>
+                    Comments:
+                    <ul>
+                        <li>Clear the functions from the function list</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*flist - Pointer to the function list to clear</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprFuncListInit(exprFuncList *flist);<br>
+                    Comments:
+                    <ul>
+                        <li>Initializes internal functions into the funtion list</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*flist - Function list to initialize</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li>
+            </ul>
+        </p>
+        <p><b>Value list functions:</b>
+            <ul>
+                <li>int exprValListCreate(exprValList **vlist);<br>
+                    Comments:
+                    <ul>
+                        <li>Creates a value list for variables or constants</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>**vlist - Pointer to a pointer to the value list.</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function.  On success, the pointer will
+                            be updated to point to the value list</li>
+                    </ul>
+                </li><br>
+                <li>int exprValListAdd(exprValList *vlist, char *name, EXPRTYPE val);<br>
+                    Comments:
+                    <ul>
+                        <li>Add a value in a value list.  Returns error if value
+                            already exists.</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*vlist - Value list to add a value to</li>
+                        <li>*name - Name of the value to add</li>
+                        <li>val - Value of the value to add</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprValListSet(exprValList *vlist, char *name, EXPRTYPE val);<br>
+                    Comments:
+                    <ul>
+                        <li>Set a value in a value list.</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*vlist - Value list to set a value in</li>
+                        <li>*name - Name of the value to set</li>
+                        <li>val - Value of the value to set</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprValListGet(exprValList *vlist, char *name, EXPRTYPE *val)<br>
+                    Comment:
+                    <ul>
+                        <li>Get the value of a variable or constant in a value list</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*vlist - Value list to use</li>
+                        <li>*name - Name of the value to get</li>
+                        <li>*val - Pointer to variable to get the value</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprValListAddAddress(exprValList *vlist, char *name, EXPRTYPE *addr)<br>
+                    Comment:
+                    <ul>
+                        <li>This function is used to add a named value to the value list, but
+                            uses an outside variable such as a stack variable to store the
+                            value.  This outside variable is used to set/get the value instead
+                            of the internal list value.  You must ensure that this outside
+                            variable exists as long as the expression is using it's address.</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*vlist - Value list to use</li>
+                        <li>*name - Name of the value to add</li>
+                        <li>*addr - Address of the value being added</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprValListGetAddress(exprValList *vlist, char *name, EXPRTYPE **addr)<br>
+                    Comment:
+                    <ul>
+                        <li>Get the memory address of a variable in a value list</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*vlist - Value list to use</li>
+                        <li>*name - Name of the value to get</li>
+                        <li>**addr - Pointer to a pointer to store the address of the value
+                            This will be NULL if the name is not in the list.</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>void *exprValListGetNext(exprValList *vlist, char **name, EXPRTYPE *value, EXPRTYPE** addr, void *cookie);<br>
+                    Comment:
+                    <ul>
+                        <li>This is used to enumerate the items in the value list.
+                            Do NOT change the list while enumerating the items. Any
+                            of the information items can be NULL if it is not needed.</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*vlist - Value list to use</li>
+                        <li>**name - Address of a pointer that will point to the
+                            name. Do not edit the name.</li>
+                        <li>*value - The current value of the item.</li>
+                        <li>**addr - Address of a pointer to store the address of the value.</li>
+                        <li>*cookie - NULL to find the first item, the return value to find
+                            subsequent items.</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>NULL if the item could not be found.  Otherwise a cookie
+                            to be used to find additional items.</li>
+                    </ul>
+                </li><br>
+                <li>int exprValListFree(exprValList *vlist);<br>
+                    Comments:
+                    <ul>
+                        <li>Completely free the value list</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*vlist - Value list to free</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprValListClear(exprValList *vlist);<br>
+                    Comments:
+                    <ul>
+                        <li>Set the values in the list to 0.0</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*vlist - Value list to reset</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprValListInit(exprValList *vlist);<br>
+                    Comments:
+                    <ul>
+                        <li>Initialize internal constants into a value list</li>
+                    </ul>
+                    Paramters:
+                    <ul>
+                        <li>*vlist - Value list to initialize</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li>
+            </ul>
+        </p>
+        <p><b>Expression functions:</b>
+            <ul>
+                <li>int exprCreate(exprObj **obj, exprFuncList *flist, exprValList *vlist, exprValList *clist, exprBreakFuncType breaker, void *userdata);<br>
+                    Comments:
+                    <ul>
+                        <li>Create an expression object to use</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>**obj - Pointer to a pointer to an expression object</li>
+                        <li>*flist - Function list to associate with the expression</li>
+                        <li>*vlist - Variable value list to associate with the expression</li>
+                        <li>*clist - Constant value list to associate with the expression</li>
+                        <li>breaker - Breaker function callback to associate with the expression.
+                            Used by functions that may be infinite loops (such as the for function)</li>
+                        <li>userdata - User data to associate with the expression</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprFree(exprObj *obj);<br>
+                    Comments:
+                    <ul>
+                        <li>Completely free the expression object</li>
+                    </ul>
+                    Paramters:
+                    <ul>
+                        <li>*obj - Expression object to free</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprClear(exprObj *obj);<br>
+                    Comments:
+                    <ul>
+                        <li>Clear an expression, but keep list and callback associations.
+                            You can then parse another expression without calling create</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - Expression object to clear</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprParse(exprObj *obj, char *expr);<br>
+                    Comments:
+                    <ul>
+                        <li>Parse an expression string into an expression object</li>
+                    </ul>
+                    Paramters:
+                    <ul>
+                        <li>*obj - Expression object to use</li>
+                        <li>*expr - Expression string to parse</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprEval(exprObj *obj, EXPRTYPE *val);<br>
+                    Comments:
+                    <ul>
+                        <li>Evaluate a parsed expression.  This function does not
+                        reset the breaker count at each call, but instead accumulates
+                        the count until the breaker function is called.  Then the count
+                        is reset to the value specified in exprSetBreakerCount.</li>
+                    </ul>
+                    Paramters:
+                    <ul>
+                        <li>*obj - Expression object to evaluate</li>
+                        <li>*val = Pointer to variable to get result of evaluation.
+                            This can be NULL if the result is not needed.</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>int exprEvalNode(exprObj *obj, exprNode *nodes, int curnode, EXPRTYPE *val);<br>
+                    Comments:
+                    <ul>
+                        <li>Evaluate a node of an expression.
+                            Used by custom functions</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - Expression object being used</li>
+                        <li>*nodes - Pointer to a node or list of nodes</li>
+                        <li>curnode - Index to the node to evaluate</li>
+                        <li>*val - Pointer to variable to get evaluation result</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Error code of the function</li>
+                    </ul>
+                </li><br>
+                <li>exprFuncList *exprGetFuncList(exprObj *obj);<br>
+                    Comments:
+                    <ul>
+                        <li>Gets the function list associated with an expression</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - expression object</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Pointer fo an exprFuncList object or NULL</li>
+                    </ul>
+                </li><br>
+                <li>exprValList *exprGetVarList(exprObj *obj);<br>
+                    Comments:
+                    <ul>
+                        <li>Gets the variable list associated with an expression</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - expression object</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Pointer to an exprValList object or NULL</li>
+                    </ul>
+                </li><br>
+                <li>exprValList *exprGetConstList(exprObj *obj);<br>
+                    Comments:
+                    <ul>
+                        <li>Gets the constant list associated with an expression</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - expression object</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Pointer to an exprValList object or NULL</li>
+                    </ul>
+                </li><br>
+                <li>exprBreakFuncType exprGetBreakFunc(exprObj *obj);<br>
+                    Comments:
+                    <ul>
+                        <li>Gets the breaker callback of the expression</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - expression object</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Pointer to the callback function or NULL</li>
+                    </ul>
+                </li><br>
+                <li>int exprGetBreakResult(exprObj *obj);<br>
+                    Comments:
+                    <ul>
+                        <li>Get the result of the breaker function</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - expression object</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>zero to continue, nonzero to break</li>
+                    </ul>
+                </li><br>
+                <li>void* exprGetUserData(exprObj *obj);<br>
+                    Comments:
+                    <ul>
+                        <li>Gets the user data associated with an expression</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - expression object</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>User data</li>
+                    </ul>
+                </li><br>
+                <li>void exprSetUserData(exprObj *obj, void *userdata);<br>
+                    Comments:
+                    <ul>
+                        <li>Sets the user data of an expression</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - expresion object</li>
+                        <li>userdata - user data to set</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Nothing</li>
+                    </ul>
+                </li><br>
+                <li>void exprSetBreakCount(exprObj *obj, int count);<br>
+                    Comments:
+                    <ul>
+                        <li>Set how often the breaker function is tested.
+                            The default is 100000.  This means the breaker
+                            function is tested once every 100000 times the
+                            exprEvalNode function is called for an expression.
+                            A smaller value tests the breaker function more often
+                            and a larger value tests the breaker function less. The
+                            breaker value is NOT reset during each call to exprEval,
+                            but is accumulated across calles to exprEval
+                            until the breaker function is finally called.</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - expression object</li>
+                        <li>count - how many times exprEvalNode gets called before the
+                            breaker function is tested</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Nothing</li>
+                    </ul>
+                </li><br>
+                <li>void exprGetErrorPosition(exprObj *obj, int *start, int *end);<br>
+                    Comments:
+                    <ul>
+                        <li>Gets the start and ending positions in the expression string
+                            of the last parse error.  The positions include any newline
+                            characters that may be in the string.</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*obj - expression object</li>
+                        <li>*start - pointer to an integer to get the start error position,
+                            -1 if unknown</li>
+                        <li>*end - pointer to an integer to get the end error position,
+                            -1 if unknown</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>Nothing</li>
+                    </ul>
+            </ul>
+        </p>
+        <p><b>Some useful functions</b>
+            <ul>
+                <li>int exprValidIdent(char *name);<br>
+                    Comments:
+                    <ul>
+                        <li>Determine if an identifier is valid</li>
+                    </ul>
+                    Parameters:
+                    <ul>
+                        <li>*name - identifier to check</li>
+                    </ul>
+                    Returns:
+                    <ul>
+                        <li>0 on invalid. anything else on valid</li>
+                    </ul>
+                </li><br>
+            </ul>
+        </p>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Compiling">Compiling the ExprEval library</a></h2>
+    <p>Compiling the ExprEval library is pretty simple.  Just
+        compile all of the source files (*.c) and link them into
+        a library.  You need to keep "expreval.h" for the header file.</p>
+    <p>You may have to make some changes to the library.  I've
+        tried to make doing so as simple as possible.  If you
+        need to change the include files or some macros or whatnot,
+        edit the file "exprincl.h"  This file includes any other files
+        needed.  You should not have to change to much.  I have
+        tried to stick as close to ANSI/ISO C as I can.</p>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Drawbacks">Drawbacks/Problems</a></h2>
+    <p>The following is a list of some basic drawbacks of this
+        library:
+        <ul>
+            <li>This library is an expression evaluator, and nothing
+                else.  It does not simplify expressions and it
+                does not do advanced math such as calculating the
+                integrals and differentials of expression.</li>
+            <li>This library has no way of detecting overflows
+                except for those caused by the internal math
+                routines.  Adding two very very large numbers
+                may cause an overflow to occur.</li>
+            <li>This library is not super easy to use in an application.
+                It has been designed to give much control to the
+                developer. Because of this, the function/value lists
+                are seperate from the expression objects, allowing
+                the developer to use them however they need.</li>
+            <li>There is no way to delete a single function, variable,
+                or constant from a list.  This is because I see no
+                real need to do so because of the way the library
+                works.  There is no need to delete function from
+                a function list or constants from a constant list.
+                There are are also no decent reasons to delete
+                variables from a variable list until you are completely
+                done and delete all of them.</li>
+        </ul>
+    </p>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Solutions">Problems and Solutions</a></h2>
+    
+    <ul>
+        <li><b>Variables do not seem to change in a release/optimized build.</b><br>
+            I have noticed a small problem with this.  Rarely, a variable may not
+            appear to change in a release build.  The reason is to do with compiler
+            optimizations.  For example, look at the following code:
+            <blockquote>
+                <pre>
+EXPRTYPE k;
+
+/* Add variable to the list */
+exprValListAddAddress(list, "k", &k);
+
+k = 0.0;
+
+/* Evaluate expression */
+for(int x = 0; x < 100; x++)
+    {
+    exprEval(expr, &result);
+    
+    doSomething(k);
+    }
+                </pre>
+            </blockquote>
+            Inside the loop, the variable 'k' does not appear to be changing, so
+            the compiler may optimize it by loading it into a register before the
+            loop and not accessing it from memory during the loop, even if
+            the expression does change it.  One way to avoid this is to use the
+            'volatile' keyword with the variable.  Then the compiler must
+            accesss it from memory each time it is accessed.
+            <blockquote>
+                <pre>
+volatile EXPRTYPE k;
+
+/* Add variable to the list */
+exprValListAddAddress(list, "k", (EXPRTYPE*)&k);
+
+k = 0.0;
+
+/* Evaluate expression */
+for(int x = 0; x < 100; x++)
+    {
+    exprEval(expr, &result);
+    
+    doSomething(k);
+    }
+                </pre>
+            </blockquote>
+        </li>
+        
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Example">Example Use with Fast Variable Access</a></h2>
+
+    <p>This is an example application of this library.  It is a
+        graphics program that calculates the color value of a
+        pixel based on it's X,Y co-ordinate.  It uses a made-up
+        image library called graphic-lib.  It uses faster variable
+        access by using the exprValListGetAddress function.</p>
+    <p>Note that this codes has not actually been tested.  See the
+        test applications (test and imagegen) for other examples.</p>
+
+    <blockquote>
+        <pre>
+/* Include files */
+#include <stdio.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include "graphiclib.h"
+#include "expreval.h"
+
+char *transerr(int err)
+    {
+    /* Translate error code into message */
+    }
+
+void gen_image(char *name, int w, int h, char *expr);
+    {
+    exprFuncList *f = NULL;
+    exprValList *v = NULL;
+    exprValList *c = NULL;
+    exprObj *o = NULL;
+    int x, y, err;
+    jmp_buf jumper;
+    int image;
+    EXPRTYPE *v_x, *v_y;
+    EXPRTYPE *v_r, *v_g, *v_b;
+    EXPRTYPE global_value;
+
+    /* Error handling */
+    err = setjmp(jumper);
+    if(err)
+        {
+        if(err != ID_IMAGENOERROR)
+            printf("Error %d occurred: %s\n", err, transerr(err));
+
+        exprFree(o);
+        exprFreeFuncList(f);
+        exprFreeValList(v);
+        exprFreeValList(c);
+
+        image_free(image);
+        return;
+        }
+
+    /* Set up lists */
+
+    /* Function list */
+    err = exprFuncListCreate(&f);
+    if(err != EXPR_ERROR_NOERROR)
+        longjmp(jumper, err);
+
+    err = exprFuncListInit(f);
+    if(err != EXPR_ERROR_NOERROR)
+        {
+        printf("Function list init error. Functions may not be available.\n");
+        }
+
+    /* Variable list */
+    err = exprValListCreate(&v);
+    if(err != EXPR_ERROR_NOERROR)
+        longjmp(jumper, err);
+
+    /* Constant list */
+    err = exprValListCreate(&c);
+    if(err != EXPR_ERROR_NOERROR)
+        {
+        printf("Constants not available\n");
+        }
+    else
+        {
+        err = exprValListInit(c);
+        if(err != EXPR_ERROR_NOERROR)
+            printf("Constant list init error. Constants may not be available.\n");
+        }
+
+    /* Create and parse the expression */
+
+    /* Create */
+    err = exprCreate(&o, f, v, c, NULL, 0);
+    if(err != EXPR_ERROR_NOERROR)
+        longjmp(jumper, err);
+
+    /* Parse expression */
+    err = exprParse(o, expr);
+    if(err != EXPR_ERROR_NOERROR)
+        longjmp(jumper, err);
+
+
+    /* Create the image */
+    image = image_create(w, h);
+    if(image == 0)
+        {
+        longjmp(jumper, ID_IMAGECREATEERROR);
+        }
+
+    /* Add width and height to variable list */
+    exprValListAdd(v, "w", (EXPRTYPE)w);
+    exprValListAdd(v, "h", (EXPRTYPE)h);
+
+    /* Add x and y to the list */
+    exprValListAdd(v, "x", 0.0);
+    exprValListAdd(v, "y", 0.0);
+
+    /* Add r, g, and b to the list */
+    exprValListAdd(v, "r", 0.0);
+    exprValListAdd(v, "g", 0.0);
+    exprValListAdd(b, "b", 0.0);
+
+    /* Get addresses.  Assume no error */
+    exprValListGetAddress(v, "x", &v_x);
+    exprValListGetAddress(v, "y", &v_y);
+
+    exprValListGetAddress(v, "r", &v_r);
+    exprValListGetAddress(v, "g", &v_g);
+    exprValListGetAddress(v, "g", &v_b);
+    
+    /* A way to add global variables that can be used by two different lists. */
+    exprValListAddAddress(v, "global", &global_value);
+    /* exprValListAddAddress(v2, "global", &global_value); */
+    
+    /* Also, exprValListAddAddress can be used to add variables directly.
+       Instead of:
+       
+       EXPRTYPE *a;
+       
+       exprValListAdd(v, "a", 0.0);
+       exprValListGetAddresss(v, "a", &a);
+       
+       You can do:
+       
+       EXPRTYPE a;
+       
+       exprValListAddAddresss(v, "a", &a);
+       
+       If you do this, you must ensure that the stack variable exists as long
+       as it is used by expression, otherwise it may cause a memory access
+       violation. */
+    
+
+    for(y = 0; y < h; y++)
+        {
+        for(x = 0; x < w; x++)
+            {
+            /* Directly set the x and y variables */
+            *v_x = (EXPRTYPE)x;
+            *v_y = (EXPRTYPE)y;
+
+            /* Eval expression, ignoring errors */
+            exprEval(o);
+
+            /* Set pixel, using variables directly */
+            image_setpixel(image, x, y, (int)(*v_r), (int)(*v_g), (int)(*v_b));
+            }
+        }
+
+    /* Save image */
+    image_save(image, name);
+
+    /* Done */
+    longjmp(jumper, ID_IMAGENOERROR);
+    }
+
+void main(void)
+    {
+    char name[MAXPATH]
+    char tmp[10];
+    char expr[4096];
+    int sx, sy;
+
+    printf("Image name to save: ");
+    gets(name);
+
+    printf("Image width: ");
+    gets(tmp);
+    sx = atoi(tmp);
+
+    printf("Image height: ");
+    gets(tmp);
+    sy = atoi(tmp);
+
+    printf("Color Expression (Use x, y, w, h Set r, g, b): ");
+    gets(expr);
+
+    gen_image(name, sx, sy, expr);
+    }
+
+        </pre>
+    </blockquote>
+</div>
+
+</body>
+</html>

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprfunc.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprfunc.c	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,329 @@
+/*
+    File: exprfunc.c
+    Auth: Brian Allen Vanderburg II
+    Date: Thursday, April 24, 2003
+    Desc: Expression function list routines
+
+    This file is part of ExprEval.
+*/
+
+
+
+/* Includes */
+#include "exprincl.h"
+
+#include "exprpriv.h"
+#include "exprmem.h"
+
+/* Internal functions */
+static exprFunc *exprCreateFunc(char *name, exprFuncType ptr, int type, int min, int max, int refmin, int refmax);
+static void exprFuncListFreeData(exprFunc *func);
+
+
+/* This function creates the function list, */
+int exprFuncListCreate(exprFuncList **flist)
+    {
+    exprFuncList *tmp;
+
+    if(flist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    *flist = NULL; /* Set to NULL initially */
+
+    tmp = exprAllocMem(sizeof(exprFuncList));
+
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY; /* Could not allocate memory */
+
+    /* Update pointer */
+    *flist = tmp;
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* Add a function to the list */
+int exprFuncListAdd(exprFuncList *flist, char *name, exprFuncType ptr, int min, int max, int refmin, int refmax)
+    {
+    exprFunc *tmp;
+    exprFunc *cur;
+    int result;
+
+    if(flist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    /* Make sure the name is valid */
+    if(!exprValidIdent(name))
+        return EXPR_ERROR_BADIDENTIFIER;
+
+    /* Fix values only if none are negative (negative values mean no limit) */
+
+    /* if both are neg, no min or max number of args */
+    /* if min is neg, max pos, no min number of args but a maximum */
+    /* if min is pos, max neg, there is a min number of args, but no max */
+    /* if both pos, then a min and max limit.  We swap to make sure it works
+       right. I.E.  Min of 3 and max of 2 would make function unusable */
+    if(min >= 0 && max >= 0)
+        {
+        if(min > max)
+            {
+            result = min;
+            min = max;
+            max = result;
+            }
+        }
+
+    if(refmin >= 0 && refmax >= 0)
+        {
+        if(refmin > refmax)
+            {
+            result = refmin;
+            refmin = max;
+            refmax = result;
+            }
+        }
+
+    if(flist->head == NULL)
+        {
+        /* Create the node right here */
+        tmp = exprCreateFunc(name, ptr, EXPR_NODETYPE_FUNCTION, min, max, refmin, refmax);
+
+        if(tmp == NULL)
+            return EXPR_ERROR_MEMORY;
+
+        flist->head = tmp;
+        return EXPR_ERROR_NOERROR;
+        }
+
+    /* See if it already exists */
+    cur = flist->head;
+    
+    while(cur)
+        {
+        result = strcmp(name, cur->fname);
+        
+        if(result == 0)
+            return EXPR_ERROR_ALREADYEXISTS;
+            
+        cur = cur->next;
+        }
+        
+    /* It did not exist, so add it at the head */
+    tmp = exprCreateFunc(name, ptr, EXPR_NODETYPE_FUNCTION, min, max, refmin, refmax);
+        
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+            
+    tmp->next = flist->head;
+    flist->head = tmp;
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* Add a function node type to the list
+   This works pretty much the same way, except the function
+   pointer is NULL and the node type specifies the function
+   to do.  exprEvalNode handles this, instead of calling
+   a function solver. */
+int exprFuncListAddType(exprFuncList *flist, char *name, int type, int min, int max, int refmin, int refmax)
+    {
+    exprFunc *tmp;
+    exprFunc *cur;
+    int result;
+
+    if(flist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    /* Make sure the name is valid */
+    if(!exprValidIdent(name))
+        return EXPR_ERROR_BADIDENTIFIER;
+
+    /* Fix values only if none are negative (negative values mean no limit) */
+
+    /* if both are neg, no min or max number of args */
+    /* if min is neg, max pos, no min number of args but a maximum */
+    /* if min is pos, max neg, there is a min number of args, but no max */
+    /* if both pos, then a min and max limit.  We swap to make sure it works
+       right. I.E.  Min of 3 and max of 2 would make function unusable */
+    if(min >= 0 && max >= 0)
+        {
+        if(min > max)
+            {
+            result = min;
+            min = max;
+            max = result;
+            }
+        }
+
+    if(refmin >= 0 && refmax >= 0)
+        {
+        if(refmin > refmax)
+            {
+            result = refmin;
+            refmin = max;
+            refmax = result;
+            }
+        }
+
+    if(flist->head == NULL)
+        {
+        /* Create the node right here */
+        tmp = exprCreateFunc(name, NULL, type, min, max, refmin, refmax);
+
+        if(tmp == NULL)
+            return EXPR_ERROR_MEMORY;
+
+        flist->head = tmp;
+        return EXPR_ERROR_NOERROR;
+        }
+
+    /* See if it already exists */
+    cur = flist->head;
+    
+    while(cur)
+        {
+        result = strcmp(name, cur->fname);
+        
+        if(result == 0)
+            return EXPR_ERROR_ALREADYEXISTS;
+            
+        cur = cur->next;
+        }
+        
+    /* It did not exist, so add it at the head */
+    tmp = exprCreateFunc(name, NULL, type, min, max, refmin, refmax);
+    
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+        
+    tmp->next = flist->head;
+    flist->head = tmp;
+    return EXPR_ERROR_NOERROR;
+    }
+
+
+/* Get the function from a list along with it's min an max data */
+int exprFuncListGet(exprFuncList *flist, char *name, exprFuncType *ptr, int *type, int *min, int *max, int *refmin, int *refmax)
+    {
+    exprFunc *cur;
+    int result;
+
+    if(flist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    if(name == NULL || name[0] == '\0')
+        return EXPR_ERROR_NOTFOUND;
+
+    /* Search for the item */
+    cur = flist->head;
+    
+    while(cur)
+        {
+        result = strcmp(name, cur->fname);
+
+        if(result == 0)
+            {
+            /* We found it. */
+            *ptr = cur->fptr;
+            *min = cur->min;
+            *max = cur->max;
+            *refmin = cur->refmin;
+            *refmax = cur->refmax;
+            *type = cur->type;
+
+            /* return now */
+            return EXPR_ERROR_NOERROR;
+            }
+            
+        cur = cur->next;
+        }
+
+    /* If we got here, we did not find the item in the list */
+    return EXPR_ERROR_NOTFOUND;
+    }
+
+/* This routine will free the function list */
+int exprFuncListFree(exprFuncList *flist)
+    {
+    /* Make sure it exists, if not it is not error */
+    if(flist == NULL)
+        return EXPR_ERROR_NOERROR;
+
+    /* Free the nodes */
+    exprFuncListFreeData(flist->head);
+
+    /* Free the container */
+    exprFreeMem(flist);
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* This routine will clear the function list */
+int exprFuncListClear(exprFuncList *flist)
+    {
+    if(flist == NULL)
+        return EXPR_ERROR_NOERROR;
+
+    /* Free the nodes only */
+    if(flist->head)
+        {
+        exprFuncListFreeData(flist->head);
+
+        flist->head = NULL;
+        }
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* This routine will free any child nodes, and then free itself */
+void exprFuncListFreeData(exprFunc *func)
+    {
+    exprFunc *next;
+    
+    while(func)
+        {
+        /* Remember the next item */
+        next = func->next;
+
+        /* Free name */
+        exprFreeMem(func->fname);
+
+        /* Free ourself */
+        exprFreeMem(func);
+        
+        func = next;
+        }
+    }
+
+/* This routine will create the function object */
+exprFunc *exprCreateFunc(char *name, exprFuncType ptr, int type, int min, int max, int refmin, int refmax)
+    {
+    exprFunc *tmp;
+    char *vtmp;
+
+    /* We already checked the name in exprFuncListAdd */
+
+    /* Create it */
+    tmp = exprAllocMem(sizeof(exprFunc));
+    if(tmp == NULL)
+        return NULL;
+
+    /* Allocate space for the name */
+    vtmp = exprAllocMem(strlen(name) + 1);
+
+    if(vtmp == NULL)
+        {
+        exprFreeMem(tmp);
+        return NULL;
+        }
+
+    /* Copy the data over */
+    strcpy(vtmp, name);
+    tmp->fname = vtmp;
+    tmp->fptr = ptr;
+    tmp->min = min;
+    tmp->max = max;
+    tmp->refmin = refmin;
+    tmp->refmax = refmax;
+    tmp->type = type;
+
+    return tmp;
+    }

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprilfs.h
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprilfs.h	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,1064 @@
+/*
+    File: exprilfs.h
+    Auth: Brian Allen Vanderburg II
+    Date: Tuesday, February 28, 2006
+    Desc: Inline Function Solvers for exprEvalNode
+
+    This file is part of ExprEval.
+*/
+
+/*
+    This is here to help prevent expreval.c from getting
+    too crowded.
+
+    Provided variables:
+    obj: expression object point
+    nodes: function node with paramters
+    d1, d2: variables
+    err: error
+    val: value pointer for resuld
+    pos: integer
+
+    Also EXPR_RESET_ERR() and EXPR_CHECK_ERR()
+
+    The chunks below are included inside a statement that looks like this:
+
+    switch(nodes->data.function.type)
+        {
+        #include "exprilfs.h"
+
+        default:
+            {
+            return EXPR_ERROR_UNKNOWN;
+            }
+        }
+*/
+
+
+
+/* abs */
+case EXPR_NODEFUNC_ABS:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        if(d1 >= 0)
+            *val = d1;
+        else
+            *val = -d1;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* mod */
+case EXPR_NODEFUNC_MOD:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = fmod(d1, d2);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* ipart */
+case EXPR_NODEFUNC_IPART:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        modf(d1, val);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* fpart */
+case EXPR_NODEFUNC_FPART:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = modf(d1, &d2);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* min */
+case EXPR_NODEFUNC_MIN:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        for(pos = 1; pos < nodes->data.function.nodecount; pos++)
+            {
+            err = exprEvalNode(obj, nodes->data.function.nodes, pos, &d2);
+            if(!err)
+                {
+                if(d2 < d1)
+                    d1 = d2;
+                }
+            else
+                return err;
+            }
+        }
+    else
+        return err;
+
+    *val = d1;
+
+    break;
+    }
+
+/* max */
+case EXPR_NODEFUNC_MAX:
+    {
+    int pos;
+
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        for(pos = 1; pos < nodes->data.function.nodecount; pos++)
+            {
+            err = exprEvalNode(obj, nodes->data.function.nodes, pos, &d2);
+            if(!err)
+                {
+                if(d2 > d1)
+                    d1 = d2;
+                }
+            else
+                return err;
+            }
+        }
+    else
+        return err;
+
+    *val = d1;
+
+    break;
+    }
+
+/* pow */
+case EXPR_NODEFUNC_POW:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = pow(d1, d2);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* sqrt */
+case EXPR_NODEFUNC_SQRT:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+    
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = sqrt(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* sin */
+case EXPR_NODEFUNC_SIN:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = sin(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* sinh */
+case EXPR_NODEFUNC_SINH:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = sinh(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* asin */
+case EXPR_NODEFUNC_ASIN:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = asin(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* cos */
+case EXPR_NODEFUNC_COS: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = cos(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* cosh */
+case EXPR_NODEFUNC_COSH: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = cosh(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* acos */
+case EXPR_NODEFUNC_ACOS: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = acos(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* tan */
+case EXPR_NODEFUNC_TAN: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = tan(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* tanh */
+case EXPR_NODEFUNC_TANH: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = tanh(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* atan */
+case EXPR_NODEFUNC_ATAN: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = atan(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* atan2 */
+case EXPR_NODEFUNC_ATAN2: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = atan2(d1, d2);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* log */
+case EXPR_NODEFUNC_LOG: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = log10(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* pow10 */
+case EXPR_NODEFUNC_POW10: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = pow(10.0, d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* ln */
+case EXPR_NODEFUNC_LN: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = log(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* exp */
+case EXPR_NODEFUNC_EXP: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = exp(d1);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+case EXPR_NODEFUNC_LOGN: 
+    {
+    EXPRTYPE l1, l2;
+
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        l1 = log(d1);
+        EXPR_CHECK_ERR();
+        l2 = log(d2);
+        EXPR_CHECK_ERR();
+
+
+        if(l2 == 0.0)
+            {
+#if(EXPR_ERROR_LEVEL >= EXPR_ERROR_LEVEL_CHECK)
+            return EXPR_ERROR_OUTOFRANGE;
+#else
+            *val = 0.0;
+            return EXPR_ERROR_NOERROR;
+#endif
+            }
+
+        *val = l1 / l2;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* ceil */
+case EXPR_NODEFUNC_CEIL: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1); 
+
+    if(!err)
+        {
+        *val = ceil(d1);
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* floor */
+case EXPR_NODEFUNC_FLOOR: 
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        *val = floor(d1);
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* rand */
+case EXPR_NODEFUNC_RAND:
+    {
+    long a;
+    
+    /* Perform random routine directly */
+    a = ((long)(*(nodes->data.function.refs[0]))) * 214013L + 2531011L;
+    *(nodes->data.function.refs[0]) = (EXPRTYPE)a;
+
+    *val =  (EXPRTYPE)((a >> 16) & 0x7FFF) / (EXPRTYPE)(32768);
+    break;
+    }
+
+/* random */
+case EXPR_NODEFUNC_RANDOM:
+    {
+    EXPRTYPE diff, rval;
+    long a;
+
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+
+    if(!err)
+        {
+        diff = d2 - d1;
+
+        /* Perform random routine directly */
+        a = ((long)(*(nodes->data.function.refs[0]))) * 214013L + 2531011L;
+        *(nodes->data.function.refs[0]) = (EXPRTYPE)a;
+
+        rval = (EXPRTYPE)((a >> 16) & 0x7FFF) / (EXPRTYPE)(32767);
+
+        *val = (rval * diff) + d1;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* randomize */
+case EXPR_NODEFUNC_RANDOMIZE:
+    {
+    static int curcall = 0;
+
+    curcall++;
+
+    *(nodes->data.function.refs[0]) = (EXPRTYPE)((clock() + 1024 + curcall) * time(NULL));
+
+    break;
+    }
+
+/* deg */
+case EXPR_NODEFUNC_DEG:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+    
+    if(!err)
+        {
+        *val = (180.0 * d1) / M_PI;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* rad */
+case EXPR_NODEFUNC_RAD:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+    
+    if(!err)
+        {
+        *val = (M_PI * d1) / 180.0;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* recttopolr */
+case EXPR_NODEFUNC_RECTTOPOLR:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+    
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = sqrt((d1 * d1) + (d2 * d2));
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* recttopola */
+case EXPR_NODEFUNC_RECTTOPOLA:
+    {
+    EXPRTYPE tmp;
+
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+    
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        tmp = atan2(d2, d1);
+        EXPR_CHECK_ERR();
+
+        if(tmp < 0.0)
+            *val = tmp = (2.0 * M_PI);
+        else
+            *val = tmp;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* poltorectx */
+case EXPR_NODEFUNC_POLTORECTX:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+    
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = d1 * cos(d2);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* poltorecty */
+case EXPR_NODEFUNC_POLTORECTY:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+    
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        *val = d1 * sin(d2);
+        EXPR_CHECK_ERR();
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* if */
+case EXPR_NODEFUNC_IF:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        if(d1 != 0.0)
+            {
+            err = exprEvalNode(obj, nodes->data.function.nodes, 1, val);
+            if(err)
+                return err;
+            }
+        else
+            {
+            err = exprEvalNode(obj, nodes->data.function.nodes, 2, val);
+            if(err)
+                return err;
+            }
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* select */
+case EXPR_NODEFUNC_SELECT:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        if(d1 < 0.0)
+            {
+            err = exprEvalNode(obj, nodes->data.function.nodes, 1, val);
+            if(err)
+                return err;
+            }
+        else if(d1 == 0.0)
+            {
+            err = exprEvalNode(obj, nodes->data.function.nodes, 2, val);
+            if(err)
+                return err;
+            }
+        else
+            {
+            if(nodes->data.function.nodecount == 3)
+                {
+                err = exprEvalNode(obj, nodes->data.function.nodes, 2, val);
+                if(err)
+                    return err;
+                }
+            else
+                {
+                err = exprEvalNode(obj, nodes->data.function.nodes, 3, val);
+                if(err)
+                    return err;
+                }
+            }
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* equal */
+case EXPR_NODEFUNC_EQUAL:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+    
+    if(!err)
+        {
+        *val = (d1 == d2) ? 1.0 : 0.0;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* above */
+case EXPR_NODEFUNC_ABOVE:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+    
+    if(!err)
+        {
+        *val = (d1 > d2) ? 1.0 : 0.0;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* below */
+case EXPR_NODEFUNC_BELOW:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+    
+    if(!err)
+        {
+        *val = (d1 < d2) ? 1.0 : 0.0;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* avg */
+case EXPR_NODEFUNC_AVG:
+    {
+    d2 = 0.0;
+    
+    for(pos = 0; pos < nodes->data.function.nodecount; pos++)
+        {
+        err = exprEvalNode(obj, nodes->data.function.nodes, pos, &d1);
+        if(!err)
+            {
+            d2 += d1;
+            }
+        else
+            return err;
+        }
+
+    *val = d2 / (EXPRTYPE)(nodes->data.function.nodecount);
+
+    break;
+    }
+
+/* clip */
+case EXPR_NODEFUNC_CLIP:
+    {
+    EXPRTYPE v;
+
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &v);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+    
+    if(!err)
+        {
+        if(v < d1)
+            *val = d1;
+        else if(v > d2)
+            *val = d2;
+        else
+            *val = v;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* clamp */
+case EXPR_NODEFUNC_CLAMP:
+    {
+    EXPRTYPE v, tmp;
+
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &v);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+    
+    if(!err)
+        {
+        EXPR_RESET_ERR();
+        tmp = fmod(v - d1, d2 - d1);
+        EXPR_CHECK_ERR();
+
+        if(tmp < 0.0)
+            *val = tmp * d2;
+        else
+            *val = tmp + d1;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* pntchange */
+case EXPR_NODEFUNC_PNTCHANGE:
+    {
+    EXPRTYPE n1, n2, pnt;
+    EXPRTYPE odiff, ndiff, perc;
+
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 2, &n1);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 3, &n2);
+
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 4, &pnt);
+    
+    if(!err)
+        {
+        odiff = d2 - d1;
+        ndiff = n2 - n1;
+
+        if(odiff == 0.0)
+            {
+            *val = d1;
+            return EXPR_ERROR_NOERROR;
+            }
+
+        perc = (pnt - d1) / odiff;
+
+        *val = n1 + (perc * ndiff);
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* poly */
+case EXPR_NODEFUNC_POLY:
+    {
+    EXPRTYPE total, curpow;
+
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+
+    if(!err)
+        {
+        curpow = (EXPRTYPE)(nodes->data.function.nodecount) - 2.0;
+        total = 0.0;
+
+        for(pos = 1; pos < nodes->data.function.nodecount; pos++)
+            {
+            err = exprEvalNode(obj, nodes->data.function.nodes, pos, &d2);
+            if(err)
+                return err;
+
+            EXPR_RESET_ERR();
+            total = total + (d2 * pow(d1, curpow));
+            EXPR_CHECK_ERR();
+
+            curpow = curpow - 1.0;
+            }
+        }
+    else
+        return err;
+
+    *val = total;
+    break;
+    }
+
+/* and */
+case EXPR_NODEFUNC_AND:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+    
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+
+    if(!err)
+        {
+        if(d1 == 0.0 || d2 == 0.0)
+            *val = 0.0;
+        else
+            *val = 1.0;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* or */
+case EXPR_NODEFUNC_OR:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+    
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &d2);
+
+    if(!err)
+        {
+        if(d1 != 0.0 || d2 != 0.0)
+            *val = 1.0;
+        else
+            *val = 0.0;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* not */
+case EXPR_NODEFUNC_NOT:
+    {
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+    
+    if(!err)
+        {
+        if(d1 != 0.0)
+            *val = 0.0;
+        else
+            *val = 1.0;
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* for */
+case EXPR_NODEFUNC_FOR:
+    {
+    int pos;
+    EXPRTYPE test;
+
+    err = exprEvalNode(obj, nodes->data.function.nodes, 0, &d1);
+    
+    if(!err)
+        err = exprEvalNode(obj, nodes->data.function.nodes, 1, &test);
+
+    if(!err)
+        {
+        while(test != 0.0)
+            {
+            for(pos = 3; pos < nodes->data.function.nodecount; pos++)
+                {
+                err = exprEvalNode(obj, nodes->data.function.nodes, pos, val);
+                if(err)
+                    return err;
+                }
+
+            err = exprEvalNode(obj, nodes->data.function.nodes, 2, &d1);
+            if(err)
+                return err;
+
+            err = exprEvalNode(obj, nodes->data.function.nodes, 1, &test);
+            if(err)
+                return err;
+            }
+        }
+    else
+        return err;
+
+    break;
+    }
+
+/* many */
+case EXPR_NODEFUNC_MANY:
+    {
+    for(pos = 0; pos < nodes->data.function.nodecount; pos++)
+        {
+        err = exprEvalNode(obj, nodes->data.function.nodes, pos, val);
+        if(err)
+            return err;
+        }
+
+    break;
+    }
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprincl.h
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprincl.h	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,101 @@
+/*
+    File: exprincl.h
+    Auth: Brian Allen Vanderburg II
+    Date: Thursday, April 24, 2003
+    Desc: Includes, macros, etc needed by this library
+
+    This file is part of ExprEval.
+*/
+
+#ifndef __BAVII_EXPRINCL_H
+#define __BAVII_EXPRINCL_H
+
+
+/* Includes and macros and whatnot for building the library */
+
+/* Memory routines.  memory.h for VC++, mem.h for BC++ */
+#ifdef __TURBOC__
+#include <mem.h>
+#else
+#include <memory.h>
+#endif
+
+/* Memory allocation */
+#include <malloc.h>
+
+/* String routines */
+#include <string.h>
+
+/* Character manipulation routines */
+#include <ctype.h>
+
+/* Standard routines */
+#include <stdlib.h>
+
+/* Math routines */
+#include <math.h>
+
+/* Time */
+#include <time.h>
+
+
+/* Math constants.  VC++ does not seem to have these */
+#ifndef M_E
+#define M_E 2.7182818284590452354
+#endif
+
+#ifndef M_LOG2E
+#define M_LOG2E 1.4426950408889634074
+#endif
+
+#ifndef M_LOG10E
+#define M_LOG10E 0.43429448190325182765
+#endif
+
+#ifndef M_LN2
+#define M_LN2 0.69314718055994530942
+#endif
+
+#ifndef M_LN10
+#define M_LN10 2.30258509299404568402
+#endif
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+#ifndef M_PI_2
+#define M_PI_2 1.57079632679489661923
+#endif
+
+#ifndef M_PI_4
+#define M_PI_4 0.78539816339744830962
+#endif
+
+#ifndef M_1_PI
+#define M_1_PI 0.31830988618379067154
+#endif
+
+#ifndef M_2_PI
+#define M_2_PI 0.63661977236758134308
+#endif
+
+#ifndef M_1_SQRTPI
+#define M_1_SQRTPI 0.56418958354776
+#endif
+
+#ifndef M_2_SQRTPI
+#define M_2_SQRTPI 1.12837916709551257390
+#endif
+
+#ifndef M_SQRT2
+#define M_SQRT2 1.41421356237309504880
+#endif
+
+#ifndef M_1_SQRT2
+#define M_1_SQRT2 0.70710678118654752440
+#endif
+
+
+
+#endif /* __BAVII_EXPRINCL_H */

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprinit.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprinit.c	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,115 @@
+/*
+    File: exprinit.c
+    Auth: Brian Allen Vanderburg II
+    Date: Thursday, May 1, 2003
+    Desc: Extra functions and routines for ExprEval
+
+    This file is part of ExprEval.
+*/
+
+/* Include files */
+#include "exprincl.h"
+
+#include "exprpriv.h"
+
+
+/* Macro for adding a function node type */
+#define EXPR_ADDFUNC_TYPE(name, type, argmin, argmax, refmin, refmax) \
+err = exprFuncListAddType(flist, name, type, argmin, argmax, refmin, refmax); \
+if(err != EXPR_ERROR_NOERROR) \
+    return err;
+
+/* Macro for adding a constant */
+#define EXPR_ADDCONST(name, val) \
+err = exprValListAdd(vlist, name, val); \
+if(err != EXPR_ERROR_NOERROR) \
+    return err;
+
+/* Call this function to initialize these functions into a function list */
+int exprFuncListInit(exprFuncList *flist)
+    {
+    int err;
+
+    if(flist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    EXPR_ADDFUNC_TYPE("abs", EXPR_NODEFUNC_ABS, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("mod", EXPR_NODEFUNC_MOD, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("ipart", EXPR_NODEFUNC_IPART, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("fpart", EXPR_NODEFUNC_FPART, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("min", EXPR_NODEFUNC_MIN, 1, -1, 0, 0);
+    EXPR_ADDFUNC_TYPE("max", EXPR_NODEFUNC_MAX, 1, -1, 0, 0);
+    EXPR_ADDFUNC_TYPE("pow", EXPR_NODEFUNC_POW, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("sqrt", EXPR_NODEFUNC_SQRT, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("sin", EXPR_NODEFUNC_SIN, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("sinh", EXPR_NODEFUNC_SINH, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("asin", EXPR_NODEFUNC_ASIN, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("cos", EXPR_NODEFUNC_COS, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("cosh", EXPR_NODEFUNC_COSH, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("acos", EXPR_NODEFUNC_ACOS, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("tan", EXPR_NODEFUNC_TAN, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("tanh", EXPR_NODEFUNC_TANH, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("atan", EXPR_NODEFUNC_ATAN, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("atan2", EXPR_NODEFUNC_ATAN2, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("log", EXPR_NODEFUNC_LOG, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("pow10", EXPR_NODEFUNC_POW10, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("ln", EXPR_NODEFUNC_LN, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("exp", EXPR_NODEFUNC_EXP, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("logn", EXPR_NODEFUNC_LOGN, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("ceil", EXPR_NODEFUNC_CEIL, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("floor", EXPR_NODEFUNC_FLOOR, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("rand", EXPR_NODEFUNC_RAND, 0, 0, 1, 1);
+    EXPR_ADDFUNC_TYPE("random", EXPR_NODEFUNC_RANDOM, 2, 2, 1, 1);
+    EXPR_ADDFUNC_TYPE("randomize", EXPR_NODEFUNC_RANDOMIZE, 0, 0, 1, 1);
+    EXPR_ADDFUNC_TYPE("deg", EXPR_NODEFUNC_DEG, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("rad", EXPR_NODEFUNC_RAD, 1, 1, 0, 0);
+    EXPR_ADDFUNC_TYPE("recttopolr", EXPR_NODEFUNC_RECTTOPOLR, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("recttopola", EXPR_NODEFUNC_RECTTOPOLA, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("poltorectx", EXPR_NODEFUNC_POLTORECTX, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("poltorecty", EXPR_NODEFUNC_POLTORECTY, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("if", EXPR_NODEFUNC_IF, 3, 3, 0, 0);
+    EXPR_ADDFUNC_TYPE("select", EXPR_NODEFUNC_SELECT, 3, 4, 0, 0);
+    EXPR_ADDFUNC_TYPE("equal", EXPR_NODEFUNC_EQUAL, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("above", EXPR_NODEFUNC_ABOVE, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("below", EXPR_NODEFUNC_BELOW, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("avg", EXPR_NODEFUNC_AVG, 1, -1, 0, 0);
+    EXPR_ADDFUNC_TYPE("clip", EXPR_NODEFUNC_CLIP, 3, 3, 0, 0);
+    EXPR_ADDFUNC_TYPE("clamp", EXPR_NODEFUNC_CLAMP, 3, 3, 0, 0);
+    EXPR_ADDFUNC_TYPE("pntchange", EXPR_NODEFUNC_PNTCHANGE, 5, 5, 0, 0);
+    EXPR_ADDFUNC_TYPE("poly", EXPR_NODEFUNC_POLY, 2, -1, 0, 0);
+    EXPR_ADDFUNC_TYPE("and", EXPR_NODEFUNC_AND, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("or", EXPR_NODEFUNC_OR, 2, 2, 0, 0);
+    EXPR_ADDFUNC_TYPE("not", EXPR_NODEFUNC_NOT, 1 ,1, 0, 0);
+    EXPR_ADDFUNC_TYPE("for", EXPR_NODEFUNC_FOR, 4, -1, 0, 0);
+    EXPR_ADDFUNC_TYPE("many", EXPR_NODEFUNC_MANY, 1, -1, 0, 0);
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* Call this function to initialize some constants into a value list */
+int exprValListInit(exprValList *vlist)
+    {
+    int err;
+
+    if(vlist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    EXPR_ADDCONST("M_E", M_E);
+    EXPR_ADDCONST("M_LOG2E", M_LOG2E);
+    EXPR_ADDCONST("M_LOG10E", M_LOG10E);
+    EXPR_ADDCONST("M_LN2", M_LN2);
+    EXPR_ADDCONST("M_LN10", M_LN10);
+    EXPR_ADDCONST("M_PI", M_PI);
+    EXPR_ADDCONST("M_PI_2", M_PI_2);
+    EXPR_ADDCONST("M_PI_4", M_PI_4);
+    EXPR_ADDCONST("M_1_PI", M_1_PI);
+    EXPR_ADDCONST("M_2_PI", M_2_PI);
+    EXPR_ADDCONST("M_1_SQRTPI", M_1_SQRTPI);
+    EXPR_ADDCONST("M_2_SQRTPI", M_2_SQRTPI);
+    EXPR_ADDCONST("M_SQRT2", M_SQRT2);
+    EXPR_ADDCONST("M_1_SQRT2", M_1_SQRT2);
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprmem.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprmem.c	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,39 @@
+/*
+    File: exprmem.c
+    Auth: Brian Allen Vanderburg II
+    Date: Wednesday, April 30, 2003
+    Desc: Memory functions for ExprEval
+
+    This file is part of ExprEval.
+*/
+
+/* Includes */
+#include "exprincl.h"
+
+#include "exprmem.h"
+
+/* Allocate memory and zero it */
+void* exprAllocMem(size_t size)
+    {
+    void *data = malloc(size);
+    
+    if(data)
+        {
+        memset(data, 0, size);
+        }
+    
+    return data;
+    }
+
+/* Free memory */
+void exprFreeMem(void *data)
+    {
+    if(data)
+        free(data);
+    }
+
+/* Allocate a list of nodes */
+exprNode *exprAllocNodes(size_t count)
+    {
+    return exprAllocMem(count * sizeof(exprNode));
+    }

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprmem.h
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprmem.h	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,21 @@
+/*
+    File: exprmem.h
+    Auth: Brian Allen Vanderburg II
+    Date: Wednesday, April 30, 2003
+    Desc: Memory functions for ExprEval
+
+    This file is part of ExprEval.
+*/
+
+#ifndef __BAVII_EXPRMEM_H
+#define __BAVII_EXPRMEM_H
+
+/* Needed for exprNode */
+#include "exprpriv.h"
+
+void* exprAllocMem(size_t size);
+void exprFreeMem(void *data);
+exprNode *exprAllocNodes(size_t count);
+
+
+#endif /* __BAVII_EXPRMEM_H */

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprobj.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprobj.c	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,237 @@
+/*
+    File: exprobj.c
+    Auth: Brian Allen Vanderburg II
+    Date: Tuesday, April 29, 2003
+    Desc: Functions for the exprObj type
+
+    This file is part of ExprEval.
+*/
+
+/* Includes */
+#include "exprincl.h"
+
+#include "exprpriv.h"
+#include "exprmem.h"
+
+/* Internal functions */
+static void exprFreeNodeData(exprNode *node);
+
+
+/* Function to create an expression object */
+int exprCreate(exprObj **obj, exprFuncList *flist, exprValList *vlist, exprValList *clist,
+    exprBreakFuncType breaker, void *userdata)
+    {
+    exprObj *tmp;
+
+    /* Allocate memory for the object */
+    tmp = exprAllocMem(sizeof(exprObj));
+
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+
+
+    /* Assign data */
+    tmp->flist = flist;
+    tmp->vlist = vlist;
+    tmp->clist = clist;
+    tmp->breakerfunc = breaker;
+    tmp->userdata = userdata;
+    tmp->breakcount = 100000; /* Default breaker count setting */
+    tmp->breakcur = 0;
+
+    /* Update pointer */
+    *obj = tmp;
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+
+/* Free the expression */
+int exprFree(exprObj *obj)
+    {
+    if(obj == NULL)
+        return EXPR_ERROR_NOERROR;
+
+    /* First free the node data */
+    exprFreeNodeData(obj->headnode);
+    exprFreeMem(obj->headnode);
+
+    /* Free ourself */
+    exprFreeMem(obj);
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* Clear expression, keep lists, etc */
+int exprClear(exprObj *obj)
+    {
+    if(obj == NULL)
+        return EXPR_ERROR_NOERROR;
+
+    /* Free the node data only, keep function, variable, constant lists */
+    exprFreeNodeData(obj->headnode);
+    exprFreeMem(obj->headnode);
+
+    obj->headnode = NULL;
+    obj->parsedbad = 0;
+    obj->parsedgood = 0;
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+
+/* Get functions to get information about the expression object */
+
+/* Get the function list */
+exprFuncList *exprGetFuncList(exprObj *obj)
+    {
+    return (obj == NULL) ? NULL : obj->flist;
+    }
+
+/* Get the variable list */
+exprValList *exprGetVarList(exprObj *obj)
+    {
+    return (obj == NULL) ? NULL : obj->vlist;
+    }
+
+/* Get the constant list */
+exprValList *exprGetConstList(exprObj *obj)
+    {
+    return (obj == NULL) ? NULL : obj->clist;
+    }
+
+/* Get the breaker function */
+exprBreakFuncType exprGetBreakFunc(exprObj *obj)
+    {
+    return (obj == NULL) ? NULL : obj->breakerfunc;
+    }
+
+/* Check for break status */
+int exprGetBreakResult(exprObj *obj)
+    {
+    if(obj == NULL)
+        return 0;
+
+    if(obj->breakerfunc == NULL)
+        return 0;
+
+    return (*(obj->breakerfunc))(obj);
+    }
+
+/* Get the user data */
+void *exprGetUserData(exprObj *obj)
+    {
+    return (obj == NULL) ? NULL : obj->userdata;
+    }
+
+
+/* Set functions to set certain data */
+
+/* Set user data */
+void exprSetUserData(exprObj *obj, void *userdata)
+    {
+    if(obj)
+        obj->userdata = userdata;
+    }
+
+
+/* Set breaker count */
+void exprSetBreakCount(exprObj *obj, int count)
+    {
+    if(obj)
+        {
+        /* If count is negative, make it positive */
+        if(count < 0)
+            count = -count;
+
+        obj->breakcount = count;
+
+        /* Make sure the current value is not bigger than count */
+        if(obj->breakcur > count)
+            obj->breakcur = count;
+        }
+    }
+
+/* Get error position */
+void exprGetErrorPosition(exprObj *obj, int *start, int *end)
+    {
+    if(obj)
+        {
+        if(start)
+            *start = obj->starterr;
+
+        if(end)
+            *end = obj->enderr;
+        }
+    }
+
+/* This function will free a node's data */
+static void exprFreeNodeData(exprNode *node)
+    {
+    int pos;
+
+    if(node == NULL)
+        return;
+
+    /* free data based on type */
+    switch(node->type)
+        {
+        case EXPR_NODETYPE_ADD:
+        case EXPR_NODETYPE_SUBTRACT:
+        case EXPR_NODETYPE_MULTIPLY:
+        case EXPR_NODETYPE_DIVIDE:
+        case EXPR_NODETYPE_EXPONENT:
+        case EXPR_NODETYPE_NEGATE:
+        case EXPR_NODETYPE_MULTI:
+            /* Free operation data */
+            if(node->data.oper.nodes)
+                {
+                for(pos = 0; pos < node->data.oper.nodecount; pos++)
+                    exprFreeNodeData(&(node->data.oper.nodes[pos]));
+
+                exprFreeMem(node->data.oper.nodes);
+                }
+
+            break;
+
+
+        case EXPR_NODETYPE_VALUE:
+            /* Nothing to free for value */
+            break;
+
+        case EXPR_NODETYPE_VARIABLE:
+            /* Nothing to free for variable */
+            break;
+
+        case EXPR_NODETYPE_FUNCTION:
+            /* Free data of each subnode */
+            if(node->data.function.nodes)
+                {
+                for(pos = 0; pos < node->data.function.nodecount; pos++)
+                    exprFreeNodeData(&(node->data.function.nodes[pos]));
+
+                /* Free the subnode array */
+                exprFreeMem(node->data.function.nodes);
+                }
+
+            /* Free reference variable list */
+            if(node->data.function.refs)
+                exprFreeMem(node->data.function.refs);
+
+            break;
+
+        case EXPR_NODETYPE_ASSIGN:
+            /* Free subnode data */
+            if(node->data.assign.node)
+                {
+                exprFreeNodeData(node->data.assign.node);
+
+                /* Free the subnode */
+                exprFreeMem(node->data.assign.node);
+                }
+
+            break;
+        }
+    }
+
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprpars.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprpars.c	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,1558 @@
+/*
+    File: exprpars.c
+    Auth: Brian Allen Vanderburg II
+    Date: Wednesday, April 30, 2003
+    Desc: Actual parsing routines for this library
+
+    This file is part of ExprEval.
+*/
+
+/* Includes */
+#include "exprincl.h"
+
+#include "exprpriv.h"
+#include "exprmem.h"
+
+/* Data structure used by parser */
+typedef struct _exprToken
+    {
+    int type; /* token type */
+    int start; /* token start position */
+    int end; /* token end position */
+
+    union _tdata
+        {
+        char *str; /* string data */
+        EXPRTYPE val; /* value data */
+        } data;
+    } exprToken;
+
+/* Defines for token types */
+#define EXPR_TOKEN_UNKNOWN 0
+#define EXPR_TOKEN_OPAREN 1
+#define EXPR_TOKEN_CPAREN 2
+#define EXPR_TOKEN_IDENTIFIER 3
+#define EXPR_TOKEN_VALUE 4
+#define EXPR_TOKEN_PLUS 5
+#define EXPR_TOKEN_HYPHEN 6
+#define EXPR_TOKEN_ASTERISK 7
+#define EXPR_TOKEN_FSLASH 8
+#define EXPR_TOKEN_AMPERSAND 9
+#define EXPR_TOKEN_SEMICOLON 10
+#define EXPR_TOKEN_COMMA 11
+#define EXPR_TOKEN_EQUAL 12
+#define EXPR_TOKEN_HAT 13
+
+/* Internal functions */
+int exprMultiParse(exprObj *obj, exprNode *node, exprToken *tokens, int count);
+int exprInternalParse(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end);
+int exprInternalParseAssign(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index);
+int exprInternalParseAdd(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index);
+int exprInternalParseSub(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index);
+int exprInternalParseMul(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index);
+int exprInternalParseDiv(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index);
+int exprInternalParsePosNeg(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index);
+int exprInternalParseExp(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index);
+int exprInternalParseFunction(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int p1, int p2);
+int exprInternalParseVarVal(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end);
+int exprStringToTokenList(exprObj *obj, char *expr, exprToken **tokens, int *count);
+void exprFreeTokenList(exprToken *tokens, int count);
+
+/* This frees a token list */
+void exprFreeTokenList(exprToken *tokens, int count)
+    {
+    int pos;
+
+    if(tokens == NULL)
+        return;
+
+    for(pos = 0; pos < count; pos++)
+        {
+        if(tokens[pos].type == EXPR_TOKEN_IDENTIFIER)
+            exprFreeMem(tokens[pos].data.str);
+        }
+
+    exprFreeMem(tokens);
+    }
+
+/* This converts an expression string to a token list */
+int exprStringToTokenList(exprObj *obj, char *expr, exprToken **tokens, int *count)
+    {
+    int found;
+    exprToken *list;
+    int pass;
+    int pos, len;
+    int tpos;
+    int comment; /* Is a comment active */
+    int start, ilen;
+    char buf[EXPR_MAXIDENTSIZE + 1];
+
+    /* Set initial variables */
+    found = 0;
+    tpos = 0;
+    list = NULL;
+    comment = 0;
+    *tokens = NULL;
+    *count = 0;
+
+
+    /* Check string length */
+    len = strlen(expr);
+    if(len == 0)
+        return EXPR_ERROR_EMPTYEXPR;
+
+    /* Two passes, one to count, one to tokenize */
+    for(pass = 0; pass <= 1; pass++)
+        {
+        for(pos = 0; pos < len; pos++)
+            {
+            switch(expr[pos])
+                {
+                /* Comment */
+                case '#':
+                    {
+                    /* Only set it if a comment is not already active */
+                    if(!comment)
+                        comment = 1;
+
+                    break;
+                    }
+
+                /* Newline characters turn off comments */
+                case '\r':
+                case '\n':
+                    {
+                    /* If a comment is active, unset it */
+                    if(comment)
+                        comment = 0;
+
+                    break;
+                    }
+
+                /* Open parenthesis */
+                case '(':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_OPAREN;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Close parenthesis */
+                case ')':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_CPAREN;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Plus */
+                case '+':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_PLUS;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Hyphen */
+                case '-':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_HYPHEN;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Asterisk */
+                case '*':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_ASTERISK;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Forward slash */
+                case '/':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_FSLASH;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Hat */
+                case '^':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_HAT;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Ampersand */
+                case '&':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_AMPERSAND;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Semicolon */
+                case ';':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_SEMICOLON;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Comma */
+                case ',':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_COMMA;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Equal sign */
+                case '=':
+                    {
+                    if(!comment)
+                        {
+                        if(pass == 0)
+                            found++;
+                        else
+                            {
+                            list[tpos].type = EXPR_TOKEN_EQUAL;
+                            list[tpos].start = pos;
+                            list[tpos].end = pos;
+                            tpos++;
+                            }
+                        }
+
+                    break;
+                    }
+
+                /* Identifiers and values */
+                default:
+                    {
+                    if(!comment)
+                        {
+                        if(expr[pos] == '.' || isdigit(expr[pos]))
+                            {
+                            /* Value */
+                            start = pos;
+
+                            /* Find digits before a period */
+                            while(isdigit(expr[pos]))
+                                pos++;
+
+                            /* Find a period */
+                            if(expr[pos] == '.')
+                                pos++;
+
+                            /* Find digits after a period */
+                            while(isdigit(expr[pos]))
+                                pos++;
+
+                            /* pos is AFTER last item, back up */
+                            pos--;
+
+                            if(pass == 0)
+                                found++;
+                            else
+                                {
+                                ilen = pos - start + 1;
+
+                                /* Is the value to large */
+                                if(ilen > EXPR_MAXIDENTSIZE)
+                                    {
+                                    obj->starterr = start;
+                                    obj->enderr = pos;
+                                    exprFreeTokenList(list, found);
+                                    return EXPR_ERROR_BADIDENTIFIER;
+                                    }
+
+                                /* Create value token */
+                                strncpy(buf, expr + start, ilen);
+                                buf[ilen] = '\0';
+
+                                list[tpos].type = EXPR_TOKEN_VALUE;
+                                list[tpos].start = start;
+                                list[tpos].end = pos;
+                                list[tpos].data.val = (EXPRTYPE)atof(buf);
+                                tpos++;
+                                }
+                            }
+                        else if(expr[pos] == '_' || isalpha(expr[pos]))
+                            {
+                            /* Identifier */
+                            start = pos;
+
+                            /* Find rest of identifier */
+                            while(expr[pos] == '_' || isalnum(expr[pos]))
+                                pos++;
+
+                            /* pos is AFTER last item, back up */
+                            pos--;
+
+                            if(pass == 0)
+                                found++;
+                            else
+                                {
+                                ilen = pos - start + 1;
+
+                                /* Is the value to large */
+                                if(ilen > EXPR_MAXIDENTSIZE)
+                                    {
+                                    obj->starterr = start;
+                                    obj->enderr = pos;
+                                    exprFreeTokenList(list, found);
+                                    return EXPR_ERROR_BADIDENTIFIER;
+                                    }
+
+                                /* Create value token */
+                                strncpy(buf, expr + start, ilen);
+                                buf[ilen] = '\0';
+
+                                /* Allocate memory for identifier */
+                                list[tpos].data.str = exprAllocMem(ilen + 1);
+                                if(list[tpos].data.str == NULL)
+                                    {
+                                    exprFreeTokenList(list, found);
+                                    return EXPR_ERROR_MEMORY;
+                                    }
+
+                                list[tpos].type = EXPR_TOKEN_IDENTIFIER;
+                                list[tpos].start = start;
+                                list[tpos].end = pos;
+                                strcpy(list[tpos].data.str, buf);
+                                tpos++;
+                                }
+                            }
+                        else if(isspace(expr[pos]))
+                            {
+                            /* Spaces are ignored, do nothing */
+                            }
+                        else
+                            {
+                            /* Unknown */
+                            obj->starterr = obj->enderr = pos;
+                            exprFreeTokenList(list, found);
+                            return EXPR_ERROR_INVALIDCHAR;
+                            }
+                        }
+
+                    break;
+                    }
+                }
+            }
+
+        /* If pass is 0, allocate memory for next pass */
+        if(pass == 0)
+            {
+            /* First, make sure all comments were ended */
+            if(comment)
+                comment = 0;
+
+            /* Make sure the expression is not empty */
+            if(found == 0)
+                return EXPR_ERROR_EMPTYEXPR;
+
+            /* Allocate memory for token list */
+            list = exprAllocMem(found * sizeof(exprToken));
+            if(list == NULL)
+                return EXPR_ERROR_MEMORY;
+
+            tpos = 0;
+            }
+        }
+
+    *count = found;
+    *tokens = list;
+    return EXPR_ERROR_NOERROR;
+    }
+
+
+/* This is the main parsing routine */
+int exprParse(exprObj *obj, char *expr)
+    {
+    exprToken *tokens;
+    int count;
+    int err;
+    exprNode *tmp;
+
+    /* Make sure an object was passed */
+    if(obj == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    /* Clear expression error position */
+    obj->starterr = obj->enderr = -1;
+
+    /* Have we already been parsed? */
+    if(obj->parsedbad != 0)
+        return EXPR_ERROR_ALREADYPARSEDBAD;
+
+    if(obj->parsedgood != 0)
+        return EXPR_ERROR_ALREADYPARSEDGOOD;
+
+    /* Make sure an expression was passed */
+    if(expr == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    /* Create token list */
+    err = exprStringToTokenList(obj, expr, &tokens, &count);
+    if(err != EXPR_ERROR_NOERROR)
+        return err;
+    
+    /* Create head pointer */
+    tmp = exprAllocNodes(1);
+    if(tmp == NULL)
+        {
+        exprFreeTokenList(tokens, count);
+        return EXPR_ERROR_MEMORY;
+        }
+
+    obj->headnode = tmp;
+
+    /* Call the multiparse routine to parse subexpressions */
+    err = exprMultiParse(obj, tmp, tokens, count);
+
+    /* Free the token list */
+    exprFreeTokenList(tokens, count);
+
+    /* successful parse? */
+    if(err == EXPR_ERROR_NOERROR)
+        {
+        obj->parsedgood = 1;
+        obj->parsedbad = 0;
+        }
+    else
+        {
+        obj->parsedbad = 1;
+        obj->parsedgood = 0;
+        }
+
+    return err;
+    }
+
+
+/* Parse the subexpressions, each ending with semicolons */
+int exprMultiParse(exprObj *obj, exprNode *node, exprToken *tokens, int count)
+    {
+    int pos, plevel, last;
+    int num, cur, err;
+    exprNode *tmp;
+
+    plevel = 0;
+    num = 0;
+    last = -1;
+
+    /* First count the number of arguments */
+    for(pos = 0; pos < count; pos++)
+        {
+        switch(tokens[pos].type)
+            {
+            case EXPR_TOKEN_OPAREN:
+                /* increase plevel */
+                plevel++;
+                break;
+
+            case EXPR_TOKEN_CPAREN:
+                /* decrease plevel */
+                plevel--;
+
+                if(plevel < 0)
+                    {
+                    obj->starterr = tokens[pos].start;
+                    obj->enderr = tokens[pos].end;
+                    return EXPR_ERROR_UNMATCHEDPAREN;
+                    }
+
+                break;
+
+            case EXPR_TOKEN_SEMICOLON:
+                if(plevel == 0)
+                    {
+                    if(last == pos - 1 || pos == 0)
+                        {
+                        /* last semicolon is before us or we are at the start */
+                        obj->starterr = tokens[pos].start;
+                        obj->enderr = tokens[pos].end;
+                        return EXPR_ERROR_SYNTAX;
+                        }
+                    else
+                        {
+                        /* last semicolon is not right before us */
+                        num++;
+                        }
+                    }
+                else
+                    {
+                    /* Semicolon should not be in a parenthesis */
+                    obj->starterr = tokens[pos].start;
+                    obj->enderr = tokens[pos].end;
+                    return EXPR_ERROR_SYNTAX;
+                    }
+
+                last = pos; /* update position of last semicolon */
+                break;
+            }
+        }
+
+    /* plevel should be zero now */
+    if(plevel != 0)
+        return EXPR_ERROR_UNMATCHEDPAREN;
+
+    /* the last character should be a semicolon */
+    if(last != pos - 1)
+        return EXPR_ERROR_MISSINGSEMICOLON;
+
+    /* Now we know how many arguments there are */
+
+    /* Allocate array of subnodes */
+    tmp = exprAllocNodes(num);
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+
+    /* Set the current node's data */
+    node->type = EXPR_NODETYPE_MULTI;
+    node->data.oper.nodes = tmp;
+    node->data.oper.nodecount = num;
+
+    /* now we parse each subexpression */
+    last = 0; /* Not for last semicolon, but for first char of subexpr */
+    cur = 0;
+
+    for(pos = 0; pos < count; pos++)
+        {
+        if(tokens[pos].type == EXPR_TOKEN_SEMICOLON)
+            {
+            /* Everything from last up to pos - 1 is a parameter */
+            err = exprInternalParse(obj, &(tmp[cur]), tokens, last, pos - 1);
+            if(err != EXPR_ERROR_NOERROR)
+                return err;
+
+            /* Update last position and current argument */
+            last = pos + 1;
+            cur++;
+            }
+        }
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* This function parses each subnode and recurses if needed */
+int exprInternalParse(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end)
+    {
+    int pos;
+    int plevel = 0; /* Paren level */
+    int fgopen = -1; /* First paren group open index */
+    int fgclose = -1; /* First paren group close index */
+    int assignindex = -1; /* First = at plevel 0 for assignment */
+    int addsubindex = -1; /* Last + or - at plevel 0 for adding or subtracting */
+    int muldivindex = -1; /* Last * or / at plevel 0 for multiplying or dividing */
+    int expindex = -1; /* Last ^ fount at plevel 0 for exponents */
+    int posnegindex = -1; /* First +,- at plevel 0 for positive,negative */
+
+    /* Make sure some conditions are right */
+    if(start > end)
+        return EXPR_ERROR_UNKNOWN;
+
+    /* Scan the string for certain characters */
+    for(pos = start; pos <= end; pos++)
+        {
+        switch(tokens[pos].type)
+            {
+            case EXPR_TOKEN_OPAREN:
+                plevel++;
+
+                /* First group open? */
+                if(plevel == 1 && fgopen == -1)
+                    fgopen = pos;
+                break;
+
+            case EXPR_TOKEN_CPAREN:
+                plevel--;
+
+                /* First group close? */
+                if(plevel == 0 && fgclose == -1)
+                    fgclose = pos;
+
+                if(plevel < 0)
+                    {
+                    obj->starterr = tokens[pos].start;
+                    obj->enderr = tokens[pos].end;
+                    return EXPR_ERROR_UNMATCHEDPAREN;
+                    }
+                break;
+
+            case EXPR_TOKEN_EQUAL:
+                /* Assignment found */
+                if(plevel == 0)
+                    {
+                    if(assignindex == -1)
+                        assignindex = pos;
+                    }
+                break;
+
+            case EXPR_TOKEN_ASTERISK:
+            case EXPR_TOKEN_FSLASH:
+                /* Multiplication or division */
+                if(plevel == 0)
+                    muldivindex = pos;
+                break;
+
+            case EXPR_TOKEN_HAT:
+                /* Exponent */
+                if(plevel == 0)
+                    expindex = pos;
+                break;
+
+
+            case EXPR_TOKEN_PLUS:
+            case EXPR_TOKEN_HYPHEN:
+                /* Addition or positive or subtraction or negative*/
+                if(plevel == 0)
+                    {
+                    if(pos == start)
+                        {
+                        /* At the start area, positive/negative */
+                        if(posnegindex == -1)
+                            posnegindex = pos;
+                        }
+                    else
+                        {
+                        /* Not at start, check item in front */
+                        switch(tokens[pos - 1].type)
+                            {
+                            case EXPR_TOKEN_EQUAL: /* Equal sign */
+                            case EXPR_TOKEN_PLUS: /* Add/positive sign */
+                            case EXPR_TOKEN_HYPHEN: /* Subtract/negative sign */
+                            case EXPR_TOKEN_ASTERISK: /* Multiply sign */
+                            case EXPR_TOKEN_FSLASH: /* Divide sign */
+                            case EXPR_TOKEN_HAT: /* Exponent sign */
+
+                                /* After theses, it is positive/negative */
+                                if(posnegindex == -1)
+                                    posnegindex = pos;
+
+                                break;
+
+                            default:
+                                /* Otherwise it is addition/subtraction */
+                                addsubindex = pos;
+                                break;
+                            }
+                        }
+                    }
+                break;
+
+            }
+        }
+
+    /* plevel should now be zero */
+    if(plevel != 0)
+        return EXPR_ERROR_UNMATCHEDPAREN;
+
+    /* We must parse the data in a certain order to maintain the
+       correct order of operators at evaluation time */
+
+    /* First, take care of assignment */
+    if(assignindex != -1)
+        return exprInternalParseAssign(obj, node, tokens, start, end, assignindex);
+
+    /* Addition or subtraction is next */
+    if(addsubindex != -1)
+        {
+        if(tokens[addsubindex].type == EXPR_TOKEN_PLUS)
+            return exprInternalParseAdd(obj, node, tokens, start, end, addsubindex);
+        else
+            return exprInternalParseSub(obj, node, tokens, start, end, addsubindex);
+        }
+
+
+    /* Multiplycation or division */
+    if(muldivindex != -1)
+        {
+        if(tokens[muldivindex].type == EXPR_TOKEN_ASTERISK)
+            return exprInternalParseMul(obj, node, tokens, start, end, muldivindex);
+        else
+            return exprInternalParseDiv(obj, node, tokens, start, end, muldivindex);
+        }
+
+    /* Exponent */
+    if(expindex != -1)
+        return exprInternalParseExp(obj, node, tokens, start, end, expindex);
+
+    /* Negation */
+    if(posnegindex != -1)
+        return exprInternalParsePosNeg(obj, node, tokens, start, end, posnegindex);
+
+
+    /* Grouped parenthesis */
+    if(fgopen == start)
+        {
+        /* Closing paren. should be at the end */
+        if(fgclose == end)
+            {
+            /* Anything between them */
+            if(fgclose > fgopen + 1)
+                {
+                return exprInternalParse(obj, node, tokens, fgopen + 1, fgclose - 1);
+                }
+            else
+                {
+                /* Nothing between them */
+                obj->starterr = tokens[fgopen].start;
+                obj->enderr = tokens[fgclose].end;
+                return EXPR_ERROR_SYNTAX;
+                }
+            }
+        else /* Closing paren not at the end */
+            return EXPR_ERROR_SYNTAX;
+        }
+
+    /* Functions */
+    if(fgopen > start)
+        {
+        /* Closing paren should be at end */
+        if(fgclose == end)
+            {
+            return exprInternalParseFunction(obj, node, tokens, start, end, fgopen, fgclose);
+            }
+        else /* Closing paren not at end */
+            return EXPR_ERROR_SYNTAX;
+        }
+
+    /* If it was none of the above, it must be a variable or value */
+    return exprInternalParseVarVal(obj, node, tokens, start, end);
+    }
+
+/* Function to parse an assignment node */
+int exprInternalParseAssign(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index)
+    {
+    exprNode *tmp;
+    exprValList *l;
+    EXPRTYPE *addr;
+
+    /* Make sure the equal sign is not at the start or end */
+    if(index != start + 1 || index >= end)
+        {
+        obj->starterr = tokens[index].start;
+        obj->enderr = tokens[index].end;
+        return EXPR_ERROR_SYNTAX;
+        }
+
+    /* Make sure item before equal sign is an identifier */
+    if(tokens[index - 1].type != EXPR_TOKEN_IDENTIFIER)
+        {
+        obj->starterr = tokens[index - 1].start;
+        obj->enderr = tokens[index].end;
+        return EXPR_ERROR_SYNTAX;
+        }
+
+    /* Create expression subnode */
+    tmp = exprAllocNodes(1);
+    if(tmp == NULL)
+        {
+        return EXPR_ERROR_MEMORY;
+        }
+
+
+    /* Set the data */
+    node->type = EXPR_NODETYPE_ASSIGN;
+    node->data.assign.node = tmp;
+
+
+    /*
+        The fast access method directly accesses the memory address
+        of the variable's value at evaluation time.  Because of this,
+        we must make sure the variable does exists in the variable list.
+    */
+
+    /* Make sure name is not a constant name */
+    l = exprGetConstList(obj);
+    if(l)
+        {
+        exprValListGetAddress(l, tokens[index - 1].data.str, &addr);
+        if(addr)
+            {
+            obj->starterr = tokens[index - 1].start;
+            obj->enderr = tokens[index].end;
+            return EXPR_ERROR_CONSTANTASSIGN;
+            }
+        }
+
+    /* Get the variable list */
+    l = exprGetVarList(obj);
+    if(l == NULL)
+        return EXPR_ERROR_NOVARLIST;
+
+    /* Get variable address if already in the list */
+    exprValListGetAddress(l, tokens[index - 1].data.str, &addr);
+    if(addr == NULL) /* Variable not in the list, add it */
+        {
+        exprValListAdd(l, tokens[index - 1].data.str, 0.0);
+
+        /* Try to get address again */
+        exprValListGetAddress(l, tokens[index - 1].data.str, &addr);
+        if(addr == NULL) /* Could not add variable */
+            return EXPR_ERROR_MEMORY; /* Could not add variable to list */
+        }
+
+    node->data.assign.vaddr = addr;
+
+    /* Parse the subnode */
+    return exprInternalParse(obj, tmp, tokens, index + 1, end);
+    }
+
+/* Function to parse an addition operator */
+int exprInternalParseAdd(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index)
+    {
+    exprNode *tmp;
+    int err;
+
+    /* Make sure plus sign is at a good place */
+    if(index <= start || index >= end)
+        {
+        obj->starterr = tokens[index].start;
+        obj->enderr = tokens[index].end;
+        return EXPR_ERROR_SYNTAX;
+        }
+
+    /* Allocate space for 2 subnodes */
+    tmp = exprAllocNodes(2);
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+
+
+    /* Set the data */
+    node->type = EXPR_NODETYPE_ADD;
+    node->data.oper.nodes = tmp;
+    node->data.oper.nodecount = 2;
+
+    /* parse the left side */
+    err = exprInternalParse(obj, &(tmp[0]), tokens, start, index - 1);
+    if(err != EXPR_ERROR_NOERROR)
+        return err;
+
+    /* parse the right side */
+    return exprInternalParse(obj, &(tmp[1]), tokens, index + 1, end);
+    }
+
+/* Function to parse a subtraction operator */
+int exprInternalParseSub(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index)
+    {
+    exprNode *tmp;
+    int err;
+
+    /* Make sure minus sign is at a good place */
+    if(index <= start || index >= end)
+        {
+        obj->starterr = tokens[index].start;
+        obj->enderr = tokens[index].end;
+        return EXPR_ERROR_SYNTAX;
+        }
+
+    /* Allocate space for 2 subnodes */
+    tmp = exprAllocNodes(2);
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+
+
+    /* Set the data */
+    node->type = EXPR_NODETYPE_SUBTRACT;
+    node->data.oper.nodes = tmp;
+    node->data.oper.nodecount = 2;
+    
+    /* parse the left side */
+    err = exprInternalParse(obj, &(tmp[0]), tokens, start, index - 1);
+    if(err != EXPR_ERROR_NOERROR)
+        return err;
+
+    /* parse the right side */
+    return exprInternalParse(obj, &(tmp[1]), tokens, index + 1, end);
+    }
+
+/* Function to parse a multiplication operator */
+int exprInternalParseMul(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index)
+    {
+    exprNode *tmp;
+    int err;
+
+    /* Make sure times sign is at a good place */
+    if(index <= start || index >= end)
+        {
+        obj->starterr = tokens[index].start;
+        obj->enderr = tokens[index].end;
+        return EXPR_ERROR_SYNTAX;
+        }
+
+
+    /* Allocate space for 2 subnodes */
+    tmp = exprAllocNodes(2);
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+
+
+    /* Set the data */
+    node->type = EXPR_NODETYPE_MULTIPLY;
+    node->data.oper.nodes = tmp;
+    node->data.oper.nodecount = 2;
+
+    /* parse the left side */
+    err = exprInternalParse(obj, &(tmp[0]), tokens, start, index - 1);
+    if(err != EXPR_ERROR_NOERROR)
+        return err;
+
+    /* parse the right side */
+    return exprInternalParse(obj, &(tmp[1]), tokens, index + 1, end);
+    }
+
+/* Function to parse a division operator */
+int exprInternalParseDiv(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index)
+    {
+    exprNode *tmp;
+    int err;
+
+    /* Make sure slash sign is at a good place */
+    if(index <= start || index >= end)
+        {
+        obj->starterr = tokens[index].start;
+        obj->enderr = tokens[index].end;
+        return EXPR_ERROR_SYNTAX;
+        }
+
+
+    /* Allocate space for 2 subnodes */
+    tmp = exprAllocNodes(2);
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+
+
+    /* Set the data */
+    node->type = EXPR_NODETYPE_DIVIDE;
+    node->data.oper.nodes = tmp;
+    node->data.oper.nodecount = 2;
+
+    /* parse the left side */
+    err = exprInternalParse(obj, &(tmp[0]), tokens, start, index - 1);
+    if(err != EXPR_ERROR_NOERROR)
+        return err;
+
+    /* parse the right side */
+    return exprInternalParse(obj, &(tmp[1]), tokens, index + 1, end);
+    }
+
+/* Function to parse an exponent operator */
+int exprInternalParseExp(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index)
+    {
+    exprNode *tmp;
+    int err;
+
+    /* Make sure exponent sign is at a good place */
+    if(index <= start || index >= end)
+        {
+        obj->starterr = tokens[index].start;
+        obj->enderr = tokens[index].end;
+        return EXPR_ERROR_SYNTAX;
+        }
+
+
+    /* Allocate space for 2 subnodes */
+    tmp = exprAllocNodes(2);
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+
+
+    /* Set the data */
+    node->type = EXPR_NODETYPE_EXPONENT;
+    node->data.oper.nodes = tmp;
+    node->data.oper.nodecount = 2;
+
+    /* parse the left side */
+    err = exprInternalParse(obj, &(tmp[0]), tokens, start, index - 1);
+    if(err != EXPR_ERROR_NOERROR)
+        return err;
+
+    /* parse the right side */
+    return exprInternalParse(obj, &(tmp[1]), tokens, index + 1, end);
+    }
+
+/* Function to parse for positive and negative */
+int exprInternalParsePosNeg(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int index)
+    {
+    exprNode *tmp;
+
+    /* Position should be the same as start */
+    if(index != start)
+        {
+        obj->starterr = tokens[index].start;
+        obj->enderr = tokens[index].end;
+        return EXPR_ERROR_UNKNOWN;
+        }
+
+    /* If it is a positive, just parse the internal of it */
+    if(tokens[index].type == EXPR_TOKEN_PLUS)
+        return exprInternalParse(obj, node, tokens, index + 1, end);
+    else
+        {
+        /* Allocate subnode */
+        tmp = exprAllocNodes(1);
+        if(tmp == NULL)
+            return EXPR_ERROR_NOERROR;
+
+
+        /* Set data */
+        node->type = EXPR_NODETYPE_NEGATE;
+        node->data.oper.nodes = tmp;
+        node->data.oper.nodecount = 1;
+
+        /* Parse the subnode */
+        return exprInternalParse(obj, tmp, tokens, index + 1, end);
+        }
+    }
+
+/* Function will parse a call to a function */
+int exprInternalParseFunction(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end, int p1, int p2)
+    {
+    int pos;
+    int num, cur;
+    int refnum, refcur;
+    int plevel = 0;
+    int lv, err;
+    exprNode *tmp;
+    exprFuncType fptr;
+    int argmin, argmax;
+    int refargmin, refargmax;
+    int type;
+    exprFuncList *l;
+    exprValList *vars;
+    EXPRTYPE *addr;
+    EXPRTYPE **reftmp;
+
+    /* We should have a function list */
+    l = exprGetFuncList(obj);
+    if(l == NULL)
+        return EXPR_ERROR_NOSUCHFUNCTION;
+
+    /* check paren. location */
+    if(p2 <= p1)
+        return EXPR_ERROR_SYNTAX;
+
+    /* second paren. should not be after the end */
+    if(p2 > end)
+        return EXPR_ERROR_SYNTAX;
+
+    /* Item before parenthesis should be an identifier */
+    if(tokens[p1 - 1].type != EXPR_TOKEN_IDENTIFIER)
+        {
+        obj->starterr = tokens[p1 - 1].start;
+        obj->enderr = tokens[p1].end;
+        return EXPR_ERROR_SYNTAX;
+        }
+
+
+    /* Look up the function */
+    err = exprFuncListGet(l, tokens[p1 - 1].data.str, &fptr, &type, &argmin, &argmax, &refargmin, &refargmax);
+    if(err != EXPR_ERROR_NOERROR)
+        {
+        if(err == EXPR_ERROR_NOTFOUND)
+            {
+            obj->starterr = tokens[p1 - 1].start;
+            obj->enderr = tokens[p1 - 1].end;
+            return EXPR_ERROR_NOSUCHFUNCTION;
+            }
+        else
+            return err;
+        }
+
+    /* Make sure the function exists */
+    if(fptr == NULL && type == 0)
+        {
+        obj->starterr = tokens[p1 - 1].start;
+        obj->enderr = tokens[p1 - 1].end;
+        return EXPR_ERROR_NOSUCHFUNCTION;
+        }
+
+    /* Count arguments */
+    if(p2 == p1 + 1)
+        {
+        num = 0;
+        refnum = 0;
+        }
+    else
+        {
+        num = 1;
+        refnum = 0;
+
+
+        /* count commas */
+        for(pos = p1 + 1; pos < p2; pos++)
+            {
+            switch(tokens[pos].type)
+                {
+                case EXPR_TOKEN_OPAREN:
+                    plevel++;
+                    break;
+
+                case EXPR_TOKEN_CPAREN:
+                    plevel--;
+                    if(plevel < 0)
+                        {
+                        obj->starterr = tokens[pos].start;
+                        obj->enderr = tokens[pos].end;
+                        return EXPR_ERROR_UNMATCHEDPAREN;
+                        }
+                    break;
+
+                case EXPR_TOKEN_COMMA:
+                    /* Found comma */
+                    if(plevel == 0)
+                        num++;
+                    break;
+
+                case EXPR_TOKEN_AMPERSAND:
+                    /* Found reference mark */
+                    if(plevel == 0)
+                        {
+                        /* This may only occur after the open parenthesis or comma */
+                        if(tokens[pos - 1].type == EXPR_TOKEN_OPAREN || tokens[pos - 1].type == EXPR_TOKEN_COMMA)
+                            refnum++;
+                        else
+                            return EXPR_ERROR_SYNTAX;
+                        }
+                    break;
+                }
+            }
+
+        /* plevel should be zero */
+        if(plevel != 0)
+            return EXPR_ERROR_UNMATCHEDPAREN;
+        }
+
+    /* We now have the number of total arguments and
+       number of ref arguments.  Get number of normal
+       arguments */
+    num = num - refnum;
+
+    /* Make sure number of arguments is correct */
+    /* Here we make sure the limits are greater
+       or equal to zero because any negative number
+       could be used to specify no limit */
+    if(argmin >= 0 && num < argmin)
+        {
+        obj->starterr = tokens[p1 - 1].start;
+        obj->enderr = tokens[p2].end;
+        return EXPR_ERROR_BADNUMBERARGUMENTS;
+        }
+
+    if(argmax >= 0 && num > argmax)
+        {
+        obj->starterr = tokens[p1 - 1].start;
+        obj->enderr = tokens[p2].end;
+        return EXPR_ERROR_BADNUMBERARGUMENTS;
+        }
+
+    if(refargmin >= 0 && refnum < refargmin)
+        {
+        obj->starterr = tokens[p1 - 1].start;
+        obj->enderr = tokens[p2].end;
+        return EXPR_ERROR_BADNUMBERARGUMENTS;
+        }
+
+    if(refargmax >= 0 && refnum > refargmax)
+        {
+        obj->starterr = tokens[p1 - 1].start;
+        obj->enderr = tokens[p2].end;
+        return EXPR_ERROR_BADNUMBERARGUMENTS;
+        }
+
+    /* Set tmp to null in case of no arguments */
+    tmp = NULL;
+    reftmp = NULL;
+
+    if(num > 0)
+        {
+        /* Allocate subnodes */
+        tmp = exprAllocNodes(num);
+        if(tmp == NULL)
+            return EXPR_ERROR_MEMORY;
+        }
+
+    if(refnum > 0)
+        {
+        /* Allocate ref pointers */
+        reftmp = exprAllocMem(sizeof(EXPRTYPE*) * refnum);
+        if(reftmp == NULL)
+            {
+            exprFreeMem(tmp);
+            return EXPR_ERROR_MEMORY;
+            }
+        }
+
+
+
+    /* Set this node's data */
+    node->type = EXPR_NODETYPE_FUNCTION;
+    node->data.function.fptr = fptr;
+    node->data.function.nodecount = num;
+    node->data.function.nodes = tmp;
+    node->data.function.refcount = refnum;
+    node->data.function.refs = reftmp;
+    node->data.function.type = type;
+
+    /* parse each subnode */
+    if(num + refnum > 0)
+        {
+        plevel = 0;
+        cur = 0;
+        refcur = 0;
+        lv = p1 + 1;
+
+        /* look for commas if more than 1 arg */
+        if(num + refnum > 1)
+            {
+            for(pos = p1 + 1; pos < p2; pos++)
+                {
+                switch(tokens[pos].type)
+                    {
+                    case EXPR_TOKEN_OPAREN:
+                        plevel++;
+                        break;
+
+                    case EXPR_TOKEN_CPAREN:
+                        plevel--;
+                        break; /* Already checked paren nesting above */
+
+                    case EXPR_TOKEN_COMMA:
+                        /* Found comma */
+                        if(plevel == 0)
+                            {
+                            /* parse inside */
+                            if(tokens[lv].type == EXPR_TOKEN_AMPERSAND)
+                                {
+                                if(lv != pos - 2)
+                                    {
+                                    obj->starterr = tokens[lv].start;
+                                    obj->enderr = tokens[pos].end;
+                                    return EXPR_ERROR_SYNTAX;
+                                    }
+
+                                /* It is a reference */
+                                if(tokens[lv + 1].type != EXPR_TOKEN_IDENTIFIER)
+                                    {
+                                    obj->starterr = tokens[lv].start;
+                                    obj->enderr = tokens[lv + 1].end;
+                                    return EXPR_ERROR_SYNTAX;
+                                    }
+
+                                
+                                /* Make sure it is not a constant */
+                                vars = exprGetConstList(obj);
+                                if(vars)
+                                    {
+                                    exprValListGetAddress(vars, tokens[lv + 1].data.str, &addr);
+                                    if(addr)
+                                        {
+                                        obj->starterr = tokens[lv].start;
+                                        obj->enderr = tokens[lv + 1].start;
+                                        return EXPR_ERROR_REFCONSTANT;
+                                        }
+                                    }
+
+                                /* Get variable list */
+                                vars = exprGetVarList(obj);
+                                if(vars == NULL)
+                                    return EXPR_ERROR_NOVARLIST;
+
+                                /* Get variable address */
+                                exprValListGetAddress(vars, tokens[lv + 1].data.str, &addr);
+                                if(addr == NULL)
+                                    {
+                                    /* Add variable to list */
+                                    exprValListAdd(vars, tokens[lv + 1].data.str, 0.0);
+
+                                    /* Try to get address again */
+                                    exprValListGetAddress(vars, tokens[lv + 1].data.str, &addr);
+                                    if(addr == NULL)
+                                        return EXPR_ERROR_MEMORY; /* Could not add variable */
+                                    }
+
+                                /* Set reference item */
+                                reftmp[refcur] = addr;
+
+                                /* increase ref arg number and lv position*/
+                                refcur++;
+                                lv = pos + 1;
+                                }
+                            else
+                                {
+                                err = exprInternalParse(obj, &(tmp[cur]), tokens, lv, pos - 1);
+                                if(err != EXPR_ERROR_NOERROR)
+                                    return err;
+
+                                /* increase arg number and lv position*/
+                                lv = pos + 1;
+                                cur++;
+                                }
+                            }
+                        break;
+                    }
+                }
+            }
+
+        /* lv should point after the last comma, or open paren. if only 1 arg */
+        if(tokens[lv].type == EXPR_TOKEN_AMPERSAND)
+            {
+            if(lv != p2 - 2)
+                {
+                obj->starterr = tokens[lv].start;
+                obj->enderr = tokens[p2].end; 
+                return EXPR_ERROR_SYNTAX;
+                }
+
+            /* It is a reference */
+            if(tokens[lv + 1].type != EXPR_TOKEN_IDENTIFIER)
+                {
+                obj->starterr = tokens[lv].start;
+                obj->enderr = tokens[lv + 1].end;
+                return EXPR_ERROR_SYNTAX;
+                }
+            
+            /* Make sure it is not a constant */
+            vars = exprGetConstList(obj);
+            if(vars)
+                {
+                exprValListGetAddress(vars, tokens[lv + 1].data.str, &addr);
+                if(addr)
+                    {
+                    obj->starterr = tokens[lv].start;
+                    obj->enderr = tokens[lv + 1].start;
+                    return EXPR_ERROR_REFCONSTANT;
+                    }
+                }
+
+            /* Get variable list */
+            vars = exprGetVarList(obj);
+            if(vars == NULL)
+                return EXPR_ERROR_NOVARLIST;
+
+            /* Get variable address */
+            exprValListGetAddress(vars, tokens[lv + 1].data.str, &addr);
+            if(addr == NULL)
+                {
+                /* Add variable to list */
+                exprValListAdd(vars, tokens[lv + 1].data.str, 0.0);
+
+                /* Try to get address again */
+                exprValListGetAddress(vars, tokens[lv + 1].data.str, &addr);
+                if(addr == NULL)
+                    return EXPR_ERROR_MEMORY; /* Could not add variable */
+                }
+
+            /* Set reference item */
+            reftmp[refcur] = addr;
+            }
+        else
+            {
+            err = exprInternalParse(obj, &(tmp[cur]), tokens, lv, p2 - 1);
+            if(err != EXPR_ERROR_NOERROR)
+                return err;
+            }
+        }
+
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* Parse a variable or value */
+int exprInternalParseVarVal(exprObj *obj, exprNode *node, exprToken *tokens, int start, int end)
+    {
+    exprValList *l;
+    EXPRTYPE *addr;
+
+
+    /* Make sure positions are correct */
+    if(start != end)
+        {
+        return EXPR_ERROR_UNKNOWN;
+        }
+    
+    
+    /* Are we an identifier */
+    if(tokens[start].type == EXPR_TOKEN_IDENTIFIER)
+        {
+        /* we are an identifier */
+
+        /* check to see if it is a constant */
+        l = exprGetConstList(obj);
+        if(l != NULL)
+            {
+            if(exprValListGetAddress(l, tokens[start].data.str, &addr) == EXPR_ERROR_NOERROR)
+                {
+                /* We found it in the constant list */
+
+                /*
+                    Treat is like a variable node so application can change
+                    constant value and it will reflect in expression
+                */
+
+                node->type = EXPR_NODETYPE_VARIABLE;
+                node->data.variable.vaddr = addr;
+                return EXPR_ERROR_NOERROR;
+                }
+            }
+
+        /* Not found in the constant list, so it must be a variable */
+
+        /* Set node type */
+        node->type = EXPR_NODETYPE_VARIABLE;
+
+        /*
+            The fast access method directly accesses the memory address
+            of the variable's value at evaluation time.  Because of this,
+            we must make sure the variable does exists in the variable list.
+        */
+
+        /* Get the variable list */
+        l = exprGetVarList(obj);
+        if(l == NULL)
+            return EXPR_ERROR_NOVARLIST;
+
+        /* Get variable address if already in the list */
+        exprValListGetAddress(l, tokens[start].data.str, &addr);
+        if(addr == NULL) /* Variable not in the list, add it */
+            {
+            exprValListAdd(l, tokens[start].data.str, 0.0);
+
+            /* Try to get address again */
+            exprValListGetAddress(l, tokens[start].data.str, &addr);
+            if(addr == NULL) /* Could not add variable */
+                return EXPR_ERROR_MEMORY; /* Could not add variable to list */
+            }
+
+        node->data.variable.vaddr = addr;
+
+        return EXPR_ERROR_NOERROR;
+        }
+    else if(tokens[start].type == EXPR_TOKEN_VALUE)
+        {
+        /* we are a value */
+        node->type = EXPR_NODETYPE_VALUE;
+        node->data.value.value = tokens[start].data.val;
+        return EXPR_ERROR_NOERROR;
+        }
+    else
+        {
+        obj->starterr = tokens[start].start;
+        obj->enderr = tokens[end].end;
+        return EXPR_ERROR_UNKNOWN;
+        }
+    }

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprpriv.h
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprpriv.h	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,215 @@
+/*
+    File: exprpriv.h
+    Auth: Brian Allen Vanderburg II
+    Date: Tuesday, February 28, 2006
+    Desc: Private include file for ExprEval library
+
+    This file is part of ExprEval.
+*/
+
+
+/* Include once */
+#ifndef __BAVII_EXPRPRIV_H
+#define __BAVII_EXPRPRIV_H
+
+/* Need some definitions, NULL, etc */
+#include <stddef.h>
+
+/* Include config and main expreval header */
+#include "expreval.h"
+#include "exprconf.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+    Version number
+*/
+#define EXPR_VERSIONMAJOR 2
+#define EXPR_VERSIONMINOR 7
+
+/* Node types */
+enum
+    {
+    EXPR_NODETYPE_UNKNOWN = 0,
+    EXPR_NODETYPE_MULTI,
+    EXPR_NODETYPE_ADD,
+    EXPR_NODETYPE_SUBTRACT,
+    EXPR_NODETYPE_MULTIPLY,
+    EXPR_NODETYPE_DIVIDE,
+    EXPR_NODETYPE_EXPONENT,
+    EXPR_NODETYPE_NEGATE,
+    EXPR_NODETYPE_VALUE,
+    EXPR_NODETYPE_VARIABLE,
+    EXPR_NODETYPE_ASSIGN,
+    EXPR_NODETYPE_FUNCTION
+    };
+
+/* Functions can be evaluated directly in EXPREVAL.  If fptr
+   is NULL, type is used to determine what the function is */
+enum
+    {
+    EXPR_NODEFUNC_UNKNOWN = 0,
+    EXPR_NODEFUNC_ABS,
+    EXPR_NODEFUNC_MOD,
+    EXPR_NODEFUNC_IPART,
+    EXPR_NODEFUNC_FPART,
+    EXPR_NODEFUNC_MIN,
+    EXPR_NODEFUNC_MAX,
+    EXPR_NODEFUNC_POW,
+    EXPR_NODEFUNC_SQRT,
+    EXPR_NODEFUNC_SIN,
+    EXPR_NODEFUNC_SINH,
+    EXPR_NODEFUNC_ASIN,
+    EXPR_NODEFUNC_COS,
+    EXPR_NODEFUNC_COSH,
+    EXPR_NODEFUNC_ACOS,
+    EXPR_NODEFUNC_TAN,
+    EXPR_NODEFUNC_TANH,
+    EXPR_NODEFUNC_ATAN,
+    EXPR_NODEFUNC_ATAN2,
+    EXPR_NODEFUNC_LOG,
+    EXPR_NODEFUNC_POW10,
+    EXPR_NODEFUNC_LN,
+    EXPR_NODEFUNC_EXP,
+    EXPR_NODEFUNC_LOGN,
+    EXPR_NODEFUNC_CEIL,
+    EXPR_NODEFUNC_FLOOR,
+    EXPR_NODEFUNC_RAND,
+    EXPR_NODEFUNC_RANDOM,
+    EXPR_NODEFUNC_RANDOMIZE,
+    EXPR_NODEFUNC_DEG,
+    EXPR_NODEFUNC_RAD,
+    EXPR_NODEFUNC_RECTTOPOLR,
+    EXPR_NODEFUNC_RECTTOPOLA,
+    EXPR_NODEFUNC_POLTORECTX,
+    EXPR_NODEFUNC_POLTORECTY,
+    EXPR_NODEFUNC_IF,
+    EXPR_NODEFUNC_SELECT,
+    EXPR_NODEFUNC_EQUAL,
+    EXPR_NODEFUNC_ABOVE,
+    EXPR_NODEFUNC_BELOW,
+    EXPR_NODEFUNC_AVG,
+    EXPR_NODEFUNC_CLIP,
+    EXPR_NODEFUNC_CLAMP,
+    EXPR_NODEFUNC_PNTCHANGE,
+    EXPR_NODEFUNC_POLY,
+    EXPR_NODEFUNC_AND,
+    EXPR_NODEFUNC_OR,
+    EXPR_NODEFUNC_NOT,
+    EXPR_NODEFUNC_FOR,
+    EXPR_NODEFUNC_MANY
+    };
+
+/* Forward declarations */
+typedef struct _exprFunc exprFunc;
+typedef struct _exprVal exprVal;
+
+/* Expression object */
+struct _exprObj
+    {
+    struct _exprFuncList *flist; /* Functions */
+    struct _exprValList *vlist; /* Variables */
+    struct _exprValList *clist; /* Constants */
+    struct _exprNode *headnode; /* Head parsed node */
+
+    exprBreakFuncType breakerfunc; /* Break function type */
+
+    void *userdata; /* User data, can be any 32 bit value */
+    int parsedgood; /* non-zero if successfully parsed */
+    int parsedbad; /* non-zero if parsed but unsuccessful */
+    int breakcount; /* how often to check the breaker function */
+    int breakcur; /* do we check the breaker function yet */
+    int starterr; /* start position of an error */
+    int enderr; /* end position of an error */
+    };
+
+/* Object for a function */
+struct _exprFunc
+    {
+    char *fname; /* Name of the function */
+    exprFuncType fptr; /* Function pointer */
+    int min, max; /* Min and max args for the function. */
+    int refmin, refmax; /* Min and max ref. variables for the function */
+    int type; /* Function node type.  exprEvalNOde solves the function */
+
+    struct _exprFunc *next; /* For linked list */
+    };
+
+/* Function list object */
+struct _exprFuncList
+    {
+    struct _exprFunc *head;
+    };
+
+/* Object for values */
+struct _exprVal
+    {
+    char *vname; /* Name of the value */
+    EXPRTYPE vval; /* Value of the value */
+    EXPRTYPE *vptr; /* Pointer to a value.  Used only if not NULL */
+
+    struct _exprVal *next; /* For linked list */
+    };
+
+/* Value list */
+struct _exprValList
+    {
+    struct _exprVal *head;
+    };
+
+/* Expression node type */
+struct _exprNode
+    {
+    int type; /* Node type */
+
+    union _data /* Union of info for various types */
+        {
+        struct _oper
+            {
+            struct _exprNode *nodes; /* Operation arguments */
+            int nodecount; /* Number of arguments */
+            } oper;
+
+        struct _variable
+            {
+            EXPRTYPE *vaddr; /* Used if EXPR_FAST_VAR_ACCESS defined */
+            } variable;
+
+        struct _value
+            {
+            EXPRTYPE value; /* Value if type is value */
+            } value;
+
+        struct _assign /* Assignment struct */
+            {
+            EXPRTYPE *vaddr; /* Used if EXPR_FAST_VAR_ACCESS defined */
+            struct _exprNode *node; /* Node to evaluate */
+            } assign;
+
+        struct _function
+            {
+            exprFuncType fptr; /* Function pointer */
+            struct _exprNode *nodes; /* Array of argument nodes */
+            int nodecount; /* Number of argument nodes */
+            EXPRTYPE **refs; /* Reference variables */
+            int refcount; /* Number of variable references (not a reference counter) */
+            int type; /* Type of function for exprEvalNode if fptr is NULL */
+            } function;
+        } data;
+    };
+
+
+
+/* Functions for function lists */
+int exprFuncListAddType(exprFuncList *flist, char *name, int type, int min, int max, int refmin, int refmax);
+int exprFuncListGet(exprFuncList *flist, char *name, exprFuncType *ptr, int *type, int *min, int *max, int *refmin, int *refmax);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __BAVII_EXPRPRIV_H */
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprtmpl.html
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprtmpl.html	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,828 @@
+<html>
+
+<head>
+<title>Expression Help</title>
+<style type="text/css">
+.valid {
+  color: #00AA00;
+}
+.invalid {
+  color: #FF0000;
+}
+.excomment {
+  color: #0000FF;
+}
+.container {
+  margin-top: 10px;
+  margin-bottom: 10px;
+  padding-left: 4px;
+  padding-right: 4px;
+  border-top: 1px solid #000000;
+  border-right: 1px solid #000000;
+  border-bottom: 1px solid #000000;
+  border-left: 1px solid #000000;
+  background-color: #BBBBBB;
+}
+body {
+  background-color: #AAAAAA;
+}
+</style>
+</head>
+
+<body>
+
+<div align="center">
+    <h1>Expression Help</h1>
+    <hr>
+</div>
+
+<div align="left" class="container">
+    <h2>Contents</h2>
+    <h3>
+        <ul>
+            <li><a href="#Syntax">Expression Syntax</a></li>
+            <li><a href="#Operators">Order of Operators</a></li>
+            <li><a href="#InternalFunc">ExprEval Internal Functions</a></li>
+            <li><a href="#InternalConst">ExprEval Internal Constants</a></li>
+            <li><a href="#AppFunc">Application Internal Functions</a></li>
+            <li><a href="#AppConst">Application Internal Constants</a></li>
+            <li><a href="#AppVar">Application Internal Variables</a></li>
+        </ul>
+    </h3>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Syntax">Expression Syntax</a></h2>
+    <blockquote>
+        <p>Expressions have pretty much the same syntax as they
+            would have on paper, with the following exceptions:
+            <ul>
+                <li>Each expression must end with a semicolon. This
+                    is because the expression string can actually
+                    contain multiple expressions.  The semicolon is
+                    used to mark the end of the expression.<br>
+                    <b>Examples:</b>
+                    <ul>
+                        <li>4*x+5;</li>
+                        <li>y=5+2;g=4+6;</li>
+                        <li>y=r*sin(a);x=r*cos(a);</li>
+                    </ul>
+                </li>
+                <li>The asterisk '*' must be used to multiply.<br>
+                    <b>Examples:</b>
+                    <ul>
+                        <li>y=5*6; <b class="valid">Valid</b></li>
+                        <li>g=(x+1)*(x-1); <b class="valid">Valid</b></li>
+                        <li>g=(x+1)(x-1); <b class="invalid">Invalid</b></li>
+                    </ul>
+                </li>
+            </ul>
+        </p>
+        <p>More than one expression may be contained within an expression string.
+            As shown above, each expression must end with a semicolon, even if
+            only one expression is in the string. The value of an expression
+            string is the value of the last expression in the string.<br>
+            <b>Examlples:</b>
+            <ul>
+                <li>g=7; <b class="excomment">Value: 7</b></li>
+                <li>k=z+1; <b class="excomment">Value: z+1</b></li>
+                <li>r=4;k=6;o=9+r-k; <b class="excomment">Value: 9+r-k</b></li>
+            </ul>
+        </p>
+        <p>Some functions may take reference parameters.  These parameters are
+            references to other variables.  You can mix reference parameters
+            with normal parameters.  The order of the normal parameters must
+            remain the same and the order of the reference parameters must
+            remain the same.<br>
+            <b>Examples:</b>
+            <ul>
+                <li>min(1,2,3,4,&mval); <b class="excomment">&mval is a reference to a variable mval</b></li>
+                <li>min(1,2,&mval,3,4); <b class="excomment">You may mix them inside like this.</b></li>
+                <li>min(1,2,(&mval),3,4); <b class="invalid">You may not nest reference parameters in any way</b></li>
+            </ul>
+        </p>
+        <p>Expressions may also be nested with parenthesis.<br>
+        <b>Examples:</b>
+            <ul>
+                <li>y=sin(x-cos(5+max(4,5,6*x)));</li>
+                <li>6+(5-2*(x+y));</li>
+            </ul>
+        </p>
+        <p>Expressions may also have whitespace characters and comments.
+            Whitespace characters such as newlines, linefeeds, carriage
+            returns, spaces, and tabs are ignored.  Comments begin with
+            the pound sign '#' and end at the end of the line.<br>
+            <b>Example:</b>
+            <ul>
+                <pre>
+#Set the x value
+x = d * cos(r);
+
+#Set the y value
+y = d * sin(r);
+                </pre>
+            </ul>
+        </p>
+        <p>If a variable is used in an expression, but that variable does not exist,
+            it is considered zero.  If it does exist then its value is used instead.
+        </p>
+        <p><b>Notice:</b> An expression can <b>NOT</b> assign to a constant and an
+            expression can <b>NOT</b> use a constant as a reference parameter.
+        </p>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="Operators">Order of operators.</a></h2>
+    <blockquote>
+        <p>The order of operators are processed correctly in ExprEval.
+        The parameters to functions may be evaluated out of order, depending
+        on the function itself.</p>
+
+        The following illustrates the order of operators:
+        <table align="center" border="1" width="75%">
+            <tr>
+                <td align="center"><b>Operator</b></td>
+                <td align="center"><b>Direction</b></td>
+                <td align="center"><b>Example</b></td>
+            </tr>
+            <tr>
+                <td>Functions and Parenthesis</td>
+                <td>N/A</td>
+                <td>(x + 5) * sin(d);</td>
+            </tr>
+            <tr>
+                <td>Negation</td>
+                <td>Right to Left</td>
+                <td>y = -2;</td>
+            </tr>
+            <tr>
+                <td>Exponents</td>
+                <td>Left to Right</td>
+                <td>y = x ^ 2;</td>
+            </tr>
+            <tr>
+                <td>Multiplication and Division</td>
+                <td>Left to Right</td>
+                <td>x * 5 / y;</td>
+            </tr>
+            <tr>
+                <td>Addition and Subtraction</td>
+                <td>Left to Right</td>
+                <td>4 + 5 - 3;</td>
+            </tr>
+            <tr>
+                <td>Assignment</td>
+                <td>Right to Left</td>
+                <td>x = y = z = 0;</td>
+            </tr>
+        </table>
+
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="InternalFunc">ExprEval Internal Functions</a></h2>
+    <blockquote>
+        The following functions are provided with ExprEval:
+        <table align="center" border="1" width="75%">
+            <tr>
+                <td align="center"><b>Function</b></td>
+                <td align="center"><b>Min. Args</b></td>
+                <td align="center"><b>Max. Args</b></td>
+                <td align="center"><b>Min. Ref Args</b></td>
+                <td align="center"><b>Max. Ref Args</b></td>
+                <td align="center"><b>Result/Comment</b></td>
+            </tr>
+            <tr>
+                <td>abs(v)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Absolute value of v.<br>
+                    abs(-4.3) returns 4.3</td>
+            </tr>
+            <tr>
+                <td>mod(v,d)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Remainder of v/d.<br>
+                    mod(5.2,2.5) return 0.2</td>
+            </tr>
+            <tr>
+                <td>ipart(v)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The integer part of v.<br>
+                    ipart(3.2) returns 3</td>
+            </tr>
+            <tr>
+                <td>fpart(v)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The fractional part of v.<br>
+                    fpart(3.2) returns 0.2</td>
+            </tr>
+            <tr>
+                <td>min(v,...)</td>
+                <td>1</td>
+                <td>None</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The minimum number passed.<br>
+                    min(3,2,-5,-2,7) returns -5</td>
+            </tr>
+            <tr>
+                <td>max(v,...)</td>
+                <td>1</td>
+                <td>None</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The maximum number passed.<br>
+                    max(3,2,-5,-2,7) returns 7</td>
+            </tr>
+
+            <tr>
+                <td>pow(a,b)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The value a raised to the power b.<br>
+                    pow(3.2,1.7) returns 3.2<sup>1.7</sup></td>
+            </tr>
+            <tr>
+                <td>sqrt(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The square root of a.</br>
+                    sqrt(16) returns 4</td>
+            </tr>
+
+            <tr>
+                <td>sin(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The sine of a radians.<br>
+                    sin(1.5) returns around 0.997</td>
+            </tr>
+            <tr>
+                <td>sinh(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The hyperbolic sine of a.<br>
+                    sinh(1.5) returns around 2.129</td>
+            </tr>
+            <tr>
+                <td>asin(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The arc-sine of a in radians.<br>
+                    asin(0.5) returns around 0.524</td>
+            </tr>
+
+            <tr>
+                <td>cos(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The cosine of a radians.<br>
+                    cos(1.5) returns around 0.0707</td>
+            </tr>
+            <tr>
+                <td>cosh(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The hyperbolic cosine of a.</br>
+                    cosh(1.5) returns around 2.352</td>
+            </tr>
+            <tr>
+                <td>acos(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The arc-cosine of a in radians.<br>
+                    acos(0.5) returns around 1.047</td>
+            </tr>
+
+            <tr>
+                <td>tan(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The tangent of a radians.<br>
+                    tan(1.5) returns around 14.101</td>
+            </tr>
+            <tr>
+                <td>tanh(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The hyperbolic tangent of a.</br>
+                    tanh(1.5) returns around 0.905</td>
+            </tr>
+            <tr>
+                <td>atan(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The arc-tangent of a in radians.<br>
+                    atan(0.3) returns about 0.291</td>
+            </tr>
+            <tr>
+                <td>atan2(y,x)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The arc-tangent of y/x, with quadrant correction.<br>
+                    atan2(4,3) returns about 0.927</td>
+            </tr>
+
+            <tr>
+                <td>log(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The base 10 logarithm of a.<br>
+                    log(100) returns 2</td>
+            </tr>
+            <tr>
+                <td>pow10(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>10 raised to the power of a.<br>
+                    pow10(2) returns 100</td>
+            </tr>
+            <tr>
+                <td>ln(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The base e logarithm of a.<br>
+                    ln(2.8) returns around 1.030</td>
+            </tr>
+            <tr>
+                <td>exp(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>e raised to the power of a.<br>
+                    exp(2) returns around 7.389</td>
+            </tr>
+            <tr>
+                <td>logn(a,b)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>The base b logarithm of a.<br>
+                    logn(16,2) returns 4</td>
+            </tr>
+
+            <tr>
+                <td>ceil(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Rounds a up to the nearest integer.<br>
+                    ceil(3.2) returns 4</td>
+            </tr>
+            <tr>
+                <td>floor(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Rounds a down to the nearest integer.<br>
+                    floor(3.2) returns 3</td>
+            </tr>
+
+            <tr>
+                <td>rand(&seed)</td>
+                <td>0</td>
+                <td>0</td>
+                <td>1</td>
+                <td>1</td>
+                <td>Returns a number between 0 up to but not including 1.</td>
+            </tr>
+            <tr>
+                <td>random(a,b,&seed)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>1</td>
+                <td>1</td>
+                <td>Returns a number between a up to and including b.</td>
+            </tr>
+            <tr>
+                <td>randomize(&seed)</td>
+                <td>0</td>
+                <td>0</td>
+                <td>1</td>
+                <td>1</td>
+                <td>Seed the random number generator with a value
+                    based on the current time.<br>
+                    Return value is unknown</td>
+            </tr>
+
+            <tr>
+                <td>deg(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns a radians converted to degrees.<br>
+                    deg(3.14) returns around 179.909</td>
+            </tr>
+            <tr>
+                <td>rad(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns a degrees converted to radians.<br>
+                    rad(180) returns around 3.142</td>
+            </tr>
+            <tr>
+                <td>recttopolr(x,y)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns the polar radius of the rectangular co-ordinates.<br>
+                    recttopolr(2,3) returns around 3.606</td>
+            </tr>
+            <tr>
+                <td>recttopola(x,y)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns the polar angle (0...2PI) in radians of the rectangular co-ordinates.<br>
+                    recttopola(2,3) returns around 0.588</td>
+            </tr>
+            <tr>
+                <td>poltorectx(r,a)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns the x rectangular co-ordinate of the polar
+                    co-ordinates.<br>
+                    poltorectx(3,1.5) returns around 0.212</td>
+            </tr>
+            <tr>
+                <td>poltorecty(r,a)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns the y rectangular co-ordinate of the polar
+                    co-ordinates.<br>
+                    poltorecty(3,1.5) returns around 2.992</td>
+            </tr>
+
+            <tr>
+                <td>if(c,t,f)</td>
+                <td>3</td>
+                <td>3</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Evaluates and returns t if c is not 0.0.
+                    Else evaluates and returns f.<br>
+                    if(0.1,2.1,3.9) returns 2.1</td>
+            </tr>
+            <tr>
+                <td>select(c,n,z[,p])</td>
+                <td>3</td>
+                <td>4</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns n if c is less than 0.0.  Returns z
+                    if c is 0.0.  If c is greater than 0.0 and only
+                    three arguments were passed, returns z.  If c
+                    is greater than 0.0 and four arguments were passed,
+                    return p.<br>
+                    select(3,1,4,5) returns 5</td>
+            </tr>
+            <tr>
+                <td>equal(a,b)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns 1.0 if a is equal to b. Else returns 0.0<br>
+                    equal(3,2) returns 0.0</td>
+            </tr>
+            <tr>
+                <td>above(a,b)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns 1.0 if a is above b. Else returns 0.0<br>
+                    above(3,2) returns 1.0</td>
+            </tr>
+            <tr>
+                <td>below(a,b)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns 1.0 if a is below b. Else returns 0.0<br>
+                    below(3,2) returns 0.0</td>
+            </tr>
+
+            <tr>
+                <td>avg(a,...)</td>
+                <td>1</td>
+                <td>None</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns the average of the values passed.<br>
+                    avg(3,3,6) returns 4</td>
+            </tr>
+            <tr>
+                <td>clip(v,min,max)</td>
+                <td>3</td>
+                <td>3</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Clips v to the range from min to max.  If v is less
+                    than min, it returns min.  If v is greater than
+                    max it returns max. Otherwise it returns v.<br>
+                    clip(3,1,2) returns 2</td>
+            </tr>
+            <tr>
+                <td>clamp(v,min,max)</td>
+                <td>3</td>
+                <td>3</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Clamps v to the range from min to max, looping
+                    if needed.<br>
+                    clamp(8.2,1.3,4.7) returns 1.4</td>
+            </tr>
+            <tr>
+                <td>pntchange(side1old, side2old, side1new, side2new, oldpnt)</td>
+                <td>5</td>
+                <td>5</td>
+                <td>0</td>
+                <td>0</td>
+                <td>This is used to translate points from different
+                    scale.  It works no matter the orientation as long
+                    as the sides are lined up correctly.<br>
+                    pntchange(-1,1,0,480,-0.5) returns 120 (x example)<br>
+                    pntchange(-1,1,480,0,-0.5) returns 360 (y example)</td>
+            </tr>
+            <tr>
+                <td>poly(x,c1,...)</td>
+                <td>2</td>
+                <td>None</td>
+                <td>0</td>
+                <td>0</td>
+                <td>This function calculates the polynomial.  x is the value
+                    to use in the polynomial. c1 and on are the coefficients.<br>
+                    poly(4,6,9,3,1,4) returns 2168<br>
+                    same as 6*4<sup>4</sup> + 9*4<sup>3</sup> + 3*4<sup>2</sup> + 1*4<sup>1</sup> + 4*4<sup>0</sup></td>
+            </tr>
+
+            <tr>
+                <td>and(a,b)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns 0.0 if either a or b are 0.0 Else returns 1.0<br>
+                    and(2.1,0.0) returns 0.0</td>
+            </tr>
+            <tr>
+                <td>or(a,b)</td>
+                <td>2</td>
+                <td>2</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns 0.0 if both a and b are 0.0 Else returns 1.0<br>
+                    or(2.1,0.0) returns 1.0</td>
+            </tr>
+            <tr>
+                <td>not(a)</td>
+                <td>1</td>
+                <td>1</td>
+                <td>0</td>
+                <td>0</td>
+                <td>Returns 1.0 if a is 0.0 Else returns 0.0<br>
+                    not(0.3) returns 0.0</td>
+            </tr>
+            <tr>
+                <td>for(init,test,inc,a1,...)</td>
+                <td>4</td>
+                <td>None</td>
+                <td>0</td>
+                <td>0</td>
+                <td>This function acts like a for loop in C. First init is
+                    evaluated.  Then test is evaluated.  As long as the
+                    test is not 0.0, the action statements (a1 to an) are
+                    evaluated, the inc statement is evaluated, and the test
+                    is evaluated again.  The result is the result of the
+                    final action statement.<br>
+                    for(x=0,below(x,11),x=x+1,y=y+x) returns 55.0 (if y was
+                    initially 0.0)</td>
+            </tr>
+            <tr>
+                <td>many(expr,...)</td>
+                <td>1</td>
+                <td>None</td>
+                <td>0</td>
+                <td>0</td>
+                <td>This function treats many subexpressions as a single object
+                    (function). It is mainly for the 'for' function.<br>
+                    for(many(j=5,k=1),above(j*k,0.001),many(j=j+5,k=k/2),0)</td>
+            </tr>
+
+
+        </table>
+
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="InternalConst">ExprEval Internal Constants</a></h2>
+    <blockquote>
+        The following constants are provided with ExprEval:
+        <table align="center" border="1" width="75%">
+            <tr>
+                <td align="center"><b>Constant</b></td>
+                <td align="center"><b>Math Form</b></td>
+                <td align="center"><b>Value</b></td>
+            </tr>
+            <tr>
+                <td>M_E</td>
+                <td>e</td>
+                <td>2.7182818284590452354</td>
+            </tr>
+            <tr>
+                <td>M_LOG2E</td>
+                <td>log<sub>2</sub>(e)</td>
+                <td>1.4426950408889634074</td>
+            </tr>
+            <tr>
+                <td>M_LOG10E</td>
+                <td>log<sub>10</sub>(e)</td>
+                <td>0.43429448190325182765</td>
+            </tr>
+            <tr>
+                <td>M_LN2</td>
+                <td>ln(2)</td>
+                <td>0.69314718055994530942</td>
+            </tr>
+            <tr>
+                <td>M_LN10</td>
+                <td>ln(10)</td>
+                <td>2.30258509299404568402</td>
+            </tr>
+            <tr>
+                <td>M_PI</td>
+                <td>π</td>
+                <td>3.14159265358979323846</td>
+            </tr>
+            <tr>
+                <td>M_PI_2</td>
+                <td>π/2</td>
+                <td>1.57079632679489661923</td>
+            </tr>
+            <tr>
+                <td>M_PI_4</td>
+                <td>π/4</td>
+                <td>0.78539816339744830962</td>
+            </tr>
+            <tr>
+                <td>M_1_PI</td>
+                <td>1/π</td>
+                <td>0.31830988618379067154</td>
+            </tr>
+            <tr>
+                <td>M_2_PI</td>
+                <td>2/π</td>
+                <td>0.63661977236758134308</td>
+            </tr>
+            <tr>
+                <td>M_1_SQRTPI</td>
+                <td>1/√(π)</td>
+                <td>0.56418958354776</td>
+            </tr>
+            <tr>
+                <td>M_2_SQRTPI</td>
+                <td>2/√(π)</td>
+                <td>1.12837916709551257390</td>
+            </tr>
+            <tr>
+                <td>M_SQRT2</td>
+                <td>√(2)</td>
+                <td>1.41421356237309504880</td>
+            </tr>
+            <tr>
+                <td>M_1_SQRT2</td>
+                <td>1/√(2)</td>
+                <td>0.70710678118654752440</td>
+            </tr>
+        </table>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="AppFunc">Application Internal Functions</a></h2>
+    <blockquote>
+        Application defined expression functions go here.
+        <table align="center" border="1" width="75%">
+            <tr>
+                <td align="center"><b>Function</b></td>
+                <td align="center"><b>Min. Args</b></td>
+                <td align="center"><b>Max. Args</b></td>
+                <td align="center"><b>Min. Ref Args</b></td>
+                <td align="center"><b>Max. Ref Args</b></td>
+                <td align="center"><b>Result/Comment</b></td>
+            </tr>
+            <tr>
+                <td></td>
+                <td></td>
+                <td></td>
+                <td></td>
+                <td></td>
+                <td></td>
+            </tr>
+        </table>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="AppConst">Application Internal Constants</a></h2>
+    <blockquote>
+        Application defined expression constants go here.
+        <table align="center" border="1" width="75%">
+            <tr>
+                <td align="center"><b>Constant</b></td>
+                <td align="center"><b>Math Form</b></td>
+                <td align="center"><b>Value</b></td>
+            </tr>
+            <tr>
+                <td></td>
+                <td></td>
+                <td></td>
+            </tr>
+        </table>
+    </blockquote>
+</div>
+
+<div align="left" class="container">
+    <h2><a name="AppVar">Application Internal Variables</a></h2>
+    <blockquote>
+        Application defined expression variables go here.
+        <table align="center" border="1" width="75%">
+            <tr>
+                <td align="center"><b>Variable</b></td>
+                <td align="center"><b>Math Form</b></td>
+                <td align="center"><b>Value</b></td>
+            </tr>
+            <tr>
+                <td></td>
+                <td></td>
+                <td></td>
+            </tr>
+        </table>
+    </blockquote>
+</div>
+
+</body>
+
+</html>
+
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprutil.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprutil.c	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,43 @@
+/*
+    File: exprutil.c
+    Auth: Brian Allen Vanderburg II
+    Date: Monday, April 28, 2003
+    Desc: Utility functions for use by this library
+
+    This file is part of ExprEval.
+*/
+
+/* Include files */
+#include "exprincl.h"
+
+#include "exprpriv.h"
+
+
+/* Return the version number */
+void exprGetVersion(int *major, int *minor)
+    {
+    *major = EXPR_VERSIONMAJOR;
+    *minor = EXPR_VERSIONMINOR;
+    }
+
+/* This utility function determines if an identifier is valid */
+int exprValidIdent(char *name)
+    {
+    if(name == NULL) /* Null string */
+        return 0;
+
+    /* First must be letter or underscore */
+    if(isalpha(*name) || *name == '_')
+        name++; /* Point to next letter */
+    else
+        return 0; /* Not letter or underscore, maybe empty*/
+
+    /* others can be letter, number, or underscore */
+    while(isalnum(*name) || *name == '_')
+        name++;
+
+    /* When the while breaks out, we should be at the end */
+    return (*name == '\0') ? 1 : 0;
+    }
+
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/exprval.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/exprval.c	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,395 @@
+/*
+    File: exprval.c
+    Auth: Brian Allen Vanderburg II
+    Date: Thursday, April 24, 2003
+    Desc: Value lists for variables and constants
+
+    This file is part of ExprEval.
+*/
+
+/* Includes */
+#include "exprincl.h"
+
+#include "exprpriv.h"
+#include "exprmem.h"
+
+
+/* Internal functions */
+static exprVal *exprCreateVal(char *name, EXPRTYPE val, EXPRTYPE *addr);
+static void exprValListFreeData(exprVal *val);
+static void exprValListResetData(exprVal *val);
+
+/* This function creates the value list, */
+int exprValListCreate(exprValList **vlist)
+    {
+    exprValList *tmp;
+
+    if(vlist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    *vlist = NULL; /* Set to NULL initially */
+
+    tmp = exprAllocMem(sizeof(exprValList));
+
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY; /* Could not allocate memory */
+
+    /* Update pointer */
+    *vlist = tmp;
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* Add a value to the list */
+int exprValListAdd(exprValList *vlist, char *name, EXPRTYPE val)
+    {
+    exprVal *tmp;
+    exprVal *cur;
+    int result;
+
+    if(vlist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    /* Make sure the name is valid */
+    if(!exprValidIdent(name))
+        return EXPR_ERROR_BADIDENTIFIER;
+
+    if(vlist->head == NULL)
+        {
+        /* Create the node right here */
+        tmp = exprCreateVal(name, val, NULL);
+
+        if(tmp == NULL)
+            return EXPR_ERROR_MEMORY;
+
+        vlist->head = tmp;
+        return EXPR_ERROR_NOERROR;
+        }
+
+    /* See if already exists */
+    cur = vlist->head;
+
+    while(cur)
+        {
+        result = strcmp(name, cur->vname);
+        
+        if(result == 0)
+            return EXPR_ERROR_ALREADYEXISTS;
+            
+        cur = cur->next;
+        }
+        
+    /* We did not find it, create it and add it to the beginning */
+    tmp = exprCreateVal(name, val, NULL);
+
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+        
+    tmp->next = vlist->head;
+    vlist->head = tmp;
+    
+    return EXPR_ERROR_NOERROR;
+    }
+    
+/* Set a value in the list */
+int exprValListSet(exprValList *vlist, char *name, EXPRTYPE val)
+    {
+    exprVal *cur;
+    int result;
+
+    if(vlist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    if(name == NULL || name[0] == '\0')
+        return EXPR_ERROR_NOTFOUND;
+
+    /* Find and set it */
+    cur = vlist->head;
+
+    while(cur)
+        {
+        result = strcmp(name, cur->vname);
+        
+        if(result == 0)
+            {
+            if(cur->vptr)
+                *(cur->vptr) = val;
+            else
+                cur->vval = val;
+                
+            return EXPR_ERROR_NOERROR;                
+            }
+            
+        cur = cur->next;
+        }
+        
+    return EXPR_ERROR_NOTFOUND;
+    }    
+
+/* Get the value from a list  */
+int exprValListGet(exprValList *vlist, char *name, EXPRTYPE *val)
+    {
+    exprVal *cur;
+    int result;
+
+    if(vlist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    if(name == NULL || name[0] == '\0')
+        return EXPR_ERROR_NOTFOUND;
+
+    /* Search for the item */
+    cur = vlist->head;
+
+    while(cur)
+        {
+        result = strcmp(name, cur->vname);
+
+        if(result == 0)
+            {
+            /* We found it. */
+            if(cur->vptr)
+                *val = *(cur->vptr);
+            else
+                *val = cur->vval;
+
+            /* return now */
+            return EXPR_ERROR_NOERROR;
+            }
+
+        cur = cur->next;
+        }
+
+    /* If we got here, we did not find the item in the list */
+    return EXPR_ERROR_NOTFOUND;
+    }
+    
+/* Add an address to the list */
+int exprValListAddAddress(exprValList *vlist, char *name, EXPRTYPE *addr)
+    {
+    exprVal *tmp;
+    exprVal *cur;
+    int result;
+
+    if(vlist == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+    /* Make sure the name is valid */
+    if(!exprValidIdent(name))
+        return EXPR_ERROR_BADIDENTIFIER;
+
+    if(vlist->head == NULL)
+        {
+        /* Create the node right here */
+        tmp = exprCreateVal(name, (EXPRTYPE)0.0, addr);
+
+        if(tmp == NULL)
+            return EXPR_ERROR_MEMORY;
+
+        vlist->head = tmp;
+        return EXPR_ERROR_NOERROR;
+        }
+
+    /* See if it already exists */
+    cur = vlist->head;
+    
+    while(cur)
+        {
+        result = strcmp(name, cur->vname);
+
+        if(result == 0)
+            return EXPR_ERROR_ALREADYEXISTS;
+            
+        cur = cur->next;
+        }
+        
+    /* Add it to the list */
+    tmp = exprCreateVal(name, (EXPRTYPE)0.0, addr);
+
+    if(tmp == NULL)
+        return EXPR_ERROR_MEMORY;
+        
+    tmp->next = vlist->head;
+    vlist->head = tmp;
+
+    return EXPR_ERROR_NOERROR;
+    }    
+
+/* Get memory address of a variable value in a value list */
+int exprValListGetAddress(exprValList *vlist, char *name, EXPRTYPE **addr)
+    {
+    exprVal *cur;
+    int result;
+
+    /* Not found yet */
+    *addr = NULL;
+
+    if(vlist == NULL || addr == NULL)
+        return EXPR_ERROR_NULLPOINTER;
+
+
+    if(name == NULL || name[0] == '\0')
+        return EXPR_ERROR_NOTFOUND;
+
+    /* Search for the item */
+    cur = vlist->head;
+
+    while(cur)
+        {
+        result = strcmp(name, cur->vname);
+
+        if(result == 0)
+            {
+            /* We found it. */
+            if(cur->vptr)
+                *addr = cur->vptr;
+            else
+                *addr = &(cur->vval);
+
+            /* return now */
+            return EXPR_ERROR_NOERROR;
+            }
+            
+        cur = cur->next;
+        }
+
+    /* If we got here, we did not find it in the list */
+    return EXPR_ERROR_NOTFOUND;
+    }
+    
+/* This function is used to enumerate the values in a value list */
+void *exprValListGetNext(exprValList *vlist, char **name, EXPRTYPE *value, EXPRTYPE** addr, void *cookie)
+    {
+    exprVal *cur;
+    
+    if(vlist == NULL)
+        return NULL;
+        
+    /* Get the current item */
+    cur = (exprVal*)cookie;
+    
+    /* Find the next item */
+    if(cur == NULL)
+        cur = vlist->head;
+    else
+        cur = cur->next;
+        
+    /* Set up the data */
+    if(cur)
+        {
+        if(name)
+            *name = cur->vname;
+           
+        if(value)
+            {
+            if(cur->vptr)
+                *value = *(cur->vptr);
+            else
+                *value = cur->vval;
+            }
+            
+        if(addr)
+            {
+            if(cur->vptr)
+                *addr = cur->vptr;
+            else
+                *addr = &(cur->vval);
+            }                                
+        }
+        
+    /* If there was no value, return NULL, otherwise, return the item */
+    return (void*)cur;
+    }
+
+/* This routine will free the value list */
+int exprValListFree(exprValList *vlist)
+    {
+    /* Make sure it exists, if not it is not error */
+    if(vlist == NULL)
+        return EXPR_ERROR_NOERROR;
+
+    /* Free the nodes */
+    exprValListFreeData(vlist->head);
+
+    /* Freethe container */
+    exprFreeMem(vlist);
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* This routine will reset the value list to 0.0 */
+int exprValListClear(exprValList *vlist)
+    {
+    if(vlist == NULL)
+        return EXPR_ERROR_NOERROR;
+
+    exprValListResetData(vlist->head);
+
+    return EXPR_ERROR_NOERROR;
+    }
+
+/* This routine will free any child nodes, and then free itself */
+static void exprValListFreeData(exprVal *val)
+    {
+    exprVal *next;
+    
+    while(val)
+        {
+        /* Remember the next */
+        next = val->next;
+        
+        /* Free name */
+        exprFreeMem(val->vname);
+
+        /* Free ourself */
+        exprFreeMem(val);
+        
+        val = next;
+        }
+    }
+
+/* This routine will reset variables to 0.0 */
+static void exprValListResetData(exprVal *val)
+    {
+    while(val)
+        {
+        /* Reset data */
+        if(val->vptr)
+            *(val->vptr) = 0.0;
+      
+        val->vval = 0.0;
+        
+        val = val->next;
+        }
+    }
+
+/* This routine will create the value object */
+static exprVal *exprCreateVal(char *name, EXPRTYPE val, EXPRTYPE *addr)
+    {
+    exprVal *tmp;
+    char *vtmp;
+
+    /* Name already tested in exprValListAdd */
+
+    /* Create it */
+    tmp = exprAllocMem(sizeof(exprVal));
+    if(tmp == NULL)
+        return NULL;
+
+    /* Allocate space for the name */
+    vtmp = exprAllocMem(strlen(name) + 1);
+
+    if(vtmp == NULL)
+        {
+        exprFreeMem(tmp);
+        return NULL;
+        }
+
+    /* Copy the data over */
+    strcpy(vtmp, name);
+    tmp->vname = vtmp;
+    tmp->vval = val;
+    tmp->vptr = addr;
+
+    return tmp;
+    }

Added: freeswitch/trunk/src/mod/applications/mod_expr/license.txt
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/license.txt	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,21 @@
+ExprEval - Expression Evaluation Library
+Version 2.0
+
+Copyright (C) 2004 Brian Allen Vanderburg II
+
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+

Added: freeswitch/trunk/src/mod/applications/mod_expr/mod_expr.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/mod_expr.c	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,198 @@
+/* 
+ * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ * Copyright (C) 2005/2006, Anthony Minessale II <anthmct@yahoo.com>
+ *
+ * Version: MPL 1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ *
+ * The Initial Developer of the Original Code is
+ * Anthony Minessale II <anthmct@yahoo.com>
+ * Portions created by the Initial Developer are Copyright (C)
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * 
+ * Anthony Minessale II <anthmct@yahoo.com>
+ *
+ * mod_expr.c -- Framework Demo Module
+ *
+ */
+#include <switch.h>
+#include "expreval.h"
+
+/* Breaker function to break out of long expression functions
+   such as the 'for' function */
+int breaker(exprObj *o)
+{
+    /* Return nonzero to break out */
+    return -1;
+}
+
+
+SWITCH_STANDARD_API(expr_function)
+{
+    exprObj *e = NULL;
+    exprFuncList *f = NULL;
+    exprValList *v = NULL;
+    exprValList *c = NULL;
+    EXPRTYPE last_expr;
+	const char *expr;
+	int err;
+    char val[512] = "", *p;
+    char *m_cmd = NULL;
+    size_t len = strlen(cmd) + 3;
+
+
+    m_cmd = malloc(len);
+    assert(m_cmd);
+    switch_copy_string(m_cmd, cmd, len);
+    
+    for (p = m_cmd; p && *p; p++) {
+        if (*p == '|') {
+            *p = ';';
+        }
+    }
+
+    p = m_cmd + (strlen(m_cmd) - 1);
+    if (*p != ';') {
+        p++;
+        *p = ';';
+        p++;
+        *p = '\0';
+    }
+
+    expr = m_cmd;
+
+    /* Create function list */
+    err = exprFuncListCreate(&f);
+    if(err != EXPR_ERROR_NOERROR)
+        goto error;
+
+    /* Init function list with internal functions */
+    err = exprFuncListInit(f);
+    if(err != EXPR_ERROR_NOERROR)
+        goto error;
+
+    /* Add custom function */
+    //err = exprFuncListAdd(f, my_func, "myfunc", 1, 1, 1, 1);
+    //if(err != EXPR_ERROR_NOERROR)
+	//goto error;
+
+    /* Create constant list */
+    err = exprValListCreate(&c);
+    if(err != EXPR_ERROR_NOERROR)
+        goto error;
+
+    /* Init constant list with internal constants */
+    err = exprValListInit(c);
+    if(err != EXPR_ERROR_NOERROR)
+        goto error;
+
+    /* Create variable list */
+    err = exprValListCreate(&v);
+    if(err != EXPR_ERROR_NOERROR)
+        goto error;
+
+    /* Create expression object */
+    err = exprCreate(&e, f, v, c, breaker, NULL);
+    if(err != EXPR_ERROR_NOERROR)
+        goto error;
+
+    /* Parse expression */
+    err = exprParse(e, (char *)expr);
+    printf("WTF %s\n", expr);
+    if(err != EXPR_ERROR_NOERROR)
+        goto error;
+
+    /* Enable soft errors */
+    //exprSetSoftErrors(e, 1);
+    
+	do {
+		err = exprEval(e, &last_expr);
+	} while (err);
+
+    snprintf(val, sizeof(val), "%0.10f", last_expr);
+    for (p = (val + strlen(val) - 1); p != val; p--) {
+        if (*p != '0') {
+            *(p+1) = '\0';
+            break;
+        } 
+    }
+
+    p = val + strlen(val) - 1;
+    if (*p == '.') {
+        *p = '\0';
+    }
+
+    stream->write_function(stream, "%s", val);
+
+
+    goto done;
+
+ error:
+    /* Alert user of error */
+    stream->write_function(stream, "!err!");
+
+
+ done:
+    /* Do cleanup */
+    if(e) {
+        exprFree(e); 
+    }
+
+    if(f) {
+        exprFuncListFree(f);
+    }
+
+    if(v) {
+        exprValListFree(v);
+    }
+
+    if(c) {
+        exprValListFree(c);
+    }
+
+    switch_safe_free(m_cmd);
+
+    return SWITCH_STATUS_SUCCESS;
+}
+
+
+SWITCH_MODULE_LOAD_FUNCTION(mod_expr_load);
+SWITCH_MODULE_DEFINITION(mod_expr, mod_expr_load, NULL, NULL);
+
+SWITCH_MODULE_LOAD_FUNCTION(mod_expr_load)
+{
+	switch_api_interface_t *commands_api_interface;
+    
+	/* connect my internal structure to the blank pointer passed to me */
+    *module_interface = switch_loadable_module_create_module_interface(pool, modname);
+    
+	SWITCH_ADD_API(commands_api_interface, "expr", "Eval an expession", expr_function, "<expr>");
+
+
+	/* indicate that the module should continue to be loaded */
+	return SWITCH_STATUS_SUCCESS;
+}
+
+/* For Emacs:
+ * Local Variables:
+ * mode:c
+ * indent-tabs-mode:nil
+ * tab-width:4
+ * c-basic-offset:4
+ * End:
+ * For VIM:
+ * vim:set softtabstop=4 shiftwidth=4 tabstop=4 expandtab:
+ */

Added: freeswitch/trunk/src/mod/applications/mod_expr/readme.txt
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/applications/mod_expr/readme.txt	Thu Nov  8 18:46:26 2007
@@ -0,0 +1,170 @@
+ExprEval - A C/C++ based expression evaluation library
+Written by: Brian Allen Vanderburg II
+Licensed under the ExprEval License
+------------------------------------------------------
+ExprEval is a mostly a C based expression evaluation
+library.  The only C++ part is the C++ Wrapper which
+encapsulates the complexity of the library usage.
+
+ExprEval supports the parsing of multiple expressions
+in a single expression string.  Each sub-expression
+must end with a semicolon.  It also supports the use
+of variables, constants, and functions.  Functions
+can take multiple arguments.  These arguments can
+also be expressions.
+
+ExprEval is very fast.  It first parses the expression
+string into a tree of actions to take.  After it has
+been parsed, an expression can be evaluated many times
+over an over.
+
+Functions, variables, and constants are stored in
+their own seperate lists.  This makes is where the
+lists can be shared among multiple expression objects.
+A function list can add all the functions needed, and
+then be added to each expression object, instead of
+added each needed function to each object.  The same
+goes for constant lists.  Variable lists make it where
+one expression can depend on a variable set in another.
+
+
+Saturday, July 1, 2006
+----------------------
+Version 2.6
+
+* Added a new value list function 'exprValListGetNext' that can be used to
+  enumerate the items in a value list.  Any of the items not needed (name,
+  value, or address) can be NULL.  For example:
+  
+  char *name;
+  EXPRTYPE val;
+  void *cookie;
+  
+  cookie = exprValListGetNext(vlist, &name, &value, NULL, NULL);
+  while(cookie)
+    {
+    /* Do something with name and value */
+    cookie = exprValListGetNext(vlist, &name, &value, NULL, cookie);
+    }
+    
+  You must make sure not to actually edit the returned name, because it is a
+  pointer into the value list to the name.  This can also be used to have one
+  value list store globals.  Global variables can be added to a value list, then
+  additional lists can be created, and before any variables are added
+  or the expression is parsed, the global list can be enumerated for name and
+  address and the exprValListAddAddress can be used to add them.  This way,
+  expressions can have their own private list, but some variables may be shared
+  on each expression through the global list.  This is useful especially if the
+  globals are not known at compile time, but can be adjusted by the user.
+  For example:
+  
+  exprValList *globals;
+  exprValList *v1;
+  exprValList *v2;
+  char *name;
+  EXPRTYPE *addr;
+  void *cookie;
+  
+  exprValListCreate(&globals);
+  /* Add variables to the list, perhaps read from a user file or something */
+  
+  exprValListCreate(&v1);
+  cookie = exprValListGetNext(globals, &name, NULL, &addr, NULL);
+  while(cookie)
+    {
+    exprValListAddAddress(v1, name, addr);
+    cookie = exprValListGetNext(globals, &name, NULL, &addr, cookie);
+    }
+  
+
+Friday, June 30, 2006
+---------------------
+Version 2.5
+
+* Added a new value list function 'exprValListAddAddress'.  This function adds
+  a named value to the list, but uses the addresss of a stack variable.  The
+  stack variable is then used to set/get the value instead of the internal list
+  value.  You must ensure that the stack variable exists as long as it is used
+  by the expression.  This can permit, for example, a value name to be shared
+  with two different value lists like such:
+  
+  EXPRTYPE global_value;
+  exprValListAddAddress(vlist, "global", &global_value);
+  exprValListAddAddress(vlist2, "global", &global_value);
+  
+  Like this, the value can be directly accessed by the application, and each
+  value list will share it.  This can also be used to replace code from this:
+  
+  EXPRTYPE *a;
+  exprValListAdd(vlist, "var", 0.0);
+  exprValListGetAddress(vlist, "var", &a);
+  
+  To look like this:
+  
+  EXPRTYPE a;
+  exprValListAddAddress(vlist, "var", &a);
+* Added a value list function exprValListSet to set the value of a variable
+  (using the slow search method).  This is because the add functions now return
+  and error if the item (function/value) already exists instead of setting the
+  value of the item.  You can still use the fast direct access method.
+* Changed internal lists for function and value lists from binary trees to
+  linked lists.
+  
+  
+
+
+Thursday, May 4, 2006
+---------------------
+Version 2.0
+
+* All internal functions are evaluated directly in the exprEvalNode call.
+  This gives some speed increase.
+* Removed parameter and reference count macros as well as functin creation
+  macro.  Parameter and reference count information can be set when adding
+  a function solver.
+* Removed exprMsgFuncType, since it is unused by the library.
+* Changed much of the internal names from one-letter variable names to
+  more meaningful names.
+
+Thursday, December 1, 2005
+--------------------------
+Version 1.8
+
+* Added support for the ^ operator to raise to a power.
+  The pow function can still be used.
+* Moved basic math code (add,subtract,multiply,divide,negate,exponent)
+  and multiple expression support from function solvers to the exprEvalNode
+  function.
+
+Tuesday, November 22, 2005
+--------------------------
+I still haven't been keeping up with history much.
+
+* Removed < and > as comments.  Instead use # as a 
+  comment to the end of the line
+* Added function exprGetErrorPosition to get start and
+  end position of parse error.
+
+Monday, May 3, 2004:  Version 1.0
+---------------------------------
+This is a pretty bad time to start the history part since
+ExprEval is pretty much up and running and very operational.
+
+* Added macro EXPR_MAJORVERSION
+* Added macro EXPR_MINORVERSION
+* Added function exprGetVersion
+* Added macro to make declaring functions easy:
+  EXPR_FUNCTIONSOLVER(func_name)
+* Added support for passing variable references to functions
+  with the ampersand.  Example: minmax(1,2,3,&min,&max)
+* Added macros for reference support:
+  EXPR_REQUIREREFCOUNT
+  EXPR_REQUIREREFCOUNTMIN
+  EXPR_REQUIREREFCOUNTMAX
+  EXPR_REQUIREREFCOUNTRANGE
+* Added feature to disable assigning to a variable with the
+  same name as a constant.
+* Added feature to enable applications to change the value of
+  a constant while the expression can not.  You must add
+  any constants to the constant list BEFORE you parse the
+  expression.

Modified: freeswitch/trunk/src/switch_channel.c
==============================================================================
--- freeswitch/trunk/src/switch_channel.c	(original)
+++ freeswitch/trunk/src/switch_channel.c	Thu Nov  8 18:46:26 2007
@@ -1374,9 +1374,20 @@
 					while(*e == ' ') {
 						*e-- = '\0';
 					}
-					if ((e = strchr(vval, ')'))) {
-						*e = '\0';
+					e = vval;
+					br = 1;
+					while(e && *e) {
+						if (*e == '(') {
+							br++;
+						} else if (br > 1 && *e == ')') {
+							br--;
+						} else if (br == 1 && *e == ')') {
+							*e = '\0';
+							break;
+						}
+						e++;
 					}
+
 					vtype = 2;
 				}
 
@@ -1398,7 +1409,7 @@
 
 					if (stream.data) {
 						char *expanded_vname = NULL;
-						
+
 						if ((expanded_vname = switch_channel_expand_variables(channel, (char *)vname)) == vname) {
 							expanded_vname = NULL;
 						} else {
@@ -1462,6 +1473,7 @@
 		}
 	}
 	free(indup);
+	
 	return data;
 }
 

Modified: freeswitch/trunk/src/switch_utils.c
==============================================================================
--- freeswitch/trunk/src/switch_utils.c	(original)
+++ freeswitch/trunk/src/switch_utils.c	Thu Nov  8 18:46:26 2007
@@ -197,6 +197,67 @@
     return SWITCH_TRUE;
 }
 
+SWITCH_DECLARE(switch_bool_t) switch_is_lan_addr(const char *ip)
+{
+
+
+	return (
+			strncmp(ip, "10.", 3) &&
+			strncmp(ip, "192.168.", 8) &&
+			strncmp(ip, "127.", 4) &&
+			strncmp(ip, "255.", 4) &&
+			strncmp(ip, "0.", 2) &&
+			strncmp(ip, "1.", 2) &&
+			strncmp(ip, "2.", 2) &&
+			strncmp(ip, "172.16.", 7) &&
+			strncmp(ip, "172.17.", 7) &&
+			strncmp(ip, "172.18.", 7) &&
+			strncmp(ip, "172.19.", 7) &&
+			strncmp(ip, "172.2", 5) &&
+			strncmp(ip, "172.30.", 7) &&
+			strncmp(ip, "172.31.", 7) &&
+			strncmp(ip, "192.0.2.", 8) &&
+			strncmp(ip, "169.254.", 8)
+			) ? SWITCH_FALSE : SWITCH_TRUE;
+	
+}
+
+
+SWITCH_DECLARE(char *) switch_strip_spaces(const char *str)
+{
+	const char *sp = str;
+	char *p, *s = NULL;
+	
+	while(sp && *sp && *sp == ' ') {
+		sp++;
+	}
+	
+	s = strdup(sp);
+
+	p = s + (strlen(s) - 1);
+
+	while(*p == ' ') {
+		*p-- = '\0';
+	}
+	
+	return s;
+}
+
+SWITCH_DECLARE(switch_bool_t) switch_is_number(const char *str)
+{
+	const char *p;
+	switch_bool_t r = SWITCH_TRUE;
+
+	for (p = str; p && *p; p++) {
+		if (!(*p == '.' || (*p > 47 && *p < 58))) {
+			r = SWITCH_FALSE;
+			break;
+		}
+	}
+
+	return r;
+}
+
 
 SWITCH_DECLARE(const char *) switch_stristr(const char *str, const char *instr)
 {
@@ -536,8 +597,7 @@
 	int argc;
 	char *ptr;
 	int quot = 0;
-	char qc = '"';
-	char *e;
+	char qc = '\'';
 	int x;
 
 	if (!buf || !array || !arraylen) {
@@ -568,13 +628,21 @@
 		array[argc++] = ptr;
 	}
 
-	/* strip quotes */
+	/* strip quotes and leading / trailing spaces */
 	for (x = 0; x < argc; x++) {
-		if (*(array[x]) == qc) {
+		char *p;
+
+		while(*(array[x]) == ' ') {
 			(array[x])++;
-			if ((e = strchr(array[x], qc))) {
-				*e = '\0';
-			}
+		}
+		p = array[x];
+		while((p = strchr(array[x], qc))) {
+			memmove(p, p+1, strlen(p));
+			p++;
+		}
+		p = array[x] + (strlen(array[x]) - 1);
+		while(*p == ' ') {
+			*p-- = '\0';
 		}
 	}

    

[commit] r6189 - in freeswitch/trunk: build conf src src/include src/mod/applications/mod_commands src/mod/applications/mod_expr

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