Mon Jul 14 17:25:18 2008

Asterisk developer's documentation


func_math.c File Reference

Math related dialplan function. More...

#include "asterisk.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/logger.h"
#include "asterisk/utils.h"
#include "asterisk/app.h"
#include "asterisk/config.h"

Include dependency graph for func_math.c:

Go to the source code of this file.

Enumerations

enum  TypeOfFunctions {
  ADDFUNCTION, DIVIDEFUNCTION, MULTIPLYFUNCTION, SUBTRACTFUNCTION,
  MODULUSFUNCTION, GTFUNCTION, LTFUNCTION, GTEFUNCTION,
  LTEFUNCTION, EQFUNCTION
}
enum  TypeOfResult { FLOAT_RESULT, INT_RESULT, HEX_RESULT, CHAR_RESULT }

Functions

 AST_MODULE_INFO_STANDARD (ASTERISK_GPL_KEY,"Mathematical dialplan function")
static int load_module (void)
static int math (struct ast_channel *chan, char *cmd, char *parse, char *buf, size_t len)
static int unload_module (void)

Variables

static struct ast_custom_function math_function


Detailed Description

Math related dialplan function.

Author:
Andy Powell

Mark Spencer <markster@digium.com>

Definition in file func_math.c.


Enumeration Type Documentation

enum TypeOfFunctions

Enumerator:
ADDFUNCTION 
DIVIDEFUNCTION 
MULTIPLYFUNCTION 
SUBTRACTFUNCTION 
MODULUSFUNCTION 
GTFUNCTION 
LTFUNCTION 
GTEFUNCTION 
LTEFUNCTION 
EQFUNCTION 

Definition at line 44 of file func_math.c.

00044                      {
00045    ADDFUNCTION,
00046    DIVIDEFUNCTION,
00047    MULTIPLYFUNCTION,
00048    SUBTRACTFUNCTION,
00049    MODULUSFUNCTION,
00050    GTFUNCTION,
00051    LTFUNCTION,
00052    GTEFUNCTION,
00053    LTEFUNCTION,
00054    EQFUNCTION
00055 };

enum TypeOfResult

Enumerator:
FLOAT_RESULT 
INT_RESULT 
HEX_RESULT 
CHAR_RESULT 

Definition at line 57 of file func_math.c.

00057                   {
00058    FLOAT_RESULT,
00059    INT_RESULT,
00060    HEX_RESULT,
00061    CHAR_RESULT
00062 };


Function Documentation

AST_MODULE_INFO_STANDARD ( ASTERISK_GPL_KEY  ,
"Mathematical dialplan function"   
)

static int load_module ( void   )  [static]

Definition at line 263 of file func_math.c.

References ast_custom_function_register(), and math_function.

00264 {
00265    return ast_custom_function_register(&math_function);
00266 }

static int math ( struct ast_channel chan,
char *  cmd,
char *  parse,
char *  buf,
size_t  len 
) [static]

Definition at line 64 of file func_math.c.

References ADDFUNCTION, AST_APP_ARG, AST_DECLARE_APP_ARGS, ast_log(), AST_STANDARD_APP_ARGS, ast_strlen_zero(), DIVIDEFUNCTION, FLOAT_RESULT, GTEFUNCTION, GTFUNCTION, HEX_RESULT, INT_RESULT, LOG_WARNING, LTEFUNCTION, LTFUNCTION, MODULUSFUNCTION, MULTIPLYFUNCTION, and SUBTRACTFUNCTION.

00066 {
00067    double fnum1;
00068    double fnum2;
00069    double ftmp = 0;
00070    char *op;
00071    int iaction = -1;
00072    int type_of_result = FLOAT_RESULT;
00073    char *mvalue1, *mvalue2 = NULL, *mtype_of_result;
00074    int negvalue1 = 0;
00075    AST_DECLARE_APP_ARGS(args,
00076               AST_APP_ARG(argv0);
00077               AST_APP_ARG(argv1);
00078    );
00079 
00080    if (ast_strlen_zero(parse)) {
00081       ast_log(LOG_WARNING, "Syntax: Math(<number1><op><number 2>[,<type_of_result>]) - missing argument!\n");
00082       return -1;
00083    }
00084 
00085    AST_STANDARD_APP_ARGS(args, parse);
00086 
00087    if (args.argc < 1) {
00088       ast_log(LOG_WARNING, "Syntax: Math(<number1><op><number 2>[,<type_of_result>]) - missing argument!\n");
00089       return -1;
00090    }
00091 
00092    mvalue1 = args.argv0;
00093 
00094    if (mvalue1[0] == '-') {
00095       negvalue1 = 1;
00096       mvalue1++;
00097    }
00098 
00099    if ((op = strchr(mvalue1, '*'))) {
00100       iaction = MULTIPLYFUNCTION;
00101       *op = '\0';
00102    } else if ((op = strchr(mvalue1, '/'))) {
00103       iaction = DIVIDEFUNCTION;
00104       *op = '\0';
00105    } else if ((op = strchr(mvalue1, '%'))) {
00106       iaction = MODULUSFUNCTION;
00107       *op = '\0';
00108    } else if ((op = strchr(mvalue1, '>'))) {
00109       iaction = GTFUNCTION;
00110       *op = '\0';
00111       if (*(op + 1) == '=') {
00112          *++op = '\0';
00113          iaction = GTEFUNCTION;
00114       }
00115    } else if ((op = strchr(mvalue1, '<'))) {
00116       iaction = LTFUNCTION;
00117       *op = '\0';
00118       if (*(op + 1) == '=') {
00119          *++op = '\0';
00120          iaction = LTEFUNCTION;
00121       }
00122    } else if ((op = strchr(mvalue1, '='))) {
00123       *op = '\0';
00124       if (*(op + 1) == '=') {
00125          *++op = '\0';
00126          iaction = EQFUNCTION;
00127       } else
00128          op = NULL;
00129    } else if ((op = strchr(mvalue1, '+'))) {
00130       iaction = ADDFUNCTION;
00131       *op = '\0';
00132    } else if ((op = strchr(mvalue1, '-'))) { /* subtraction MUST always be last, in case we have a negative first number */
00133       iaction = SUBTRACTFUNCTION;
00134       *op = '\0';
00135    }
00136 
00137    if (op)
00138       mvalue2 = op + 1;
00139 
00140    /* detect wanted type of result */
00141    mtype_of_result = args.argv1;
00142    if (mtype_of_result) {
00143       if (!strcasecmp(mtype_of_result, "float")
00144           || !strcasecmp(mtype_of_result, "f"))
00145          type_of_result = FLOAT_RESULT;
00146       else if (!strcasecmp(mtype_of_result, "int")
00147           || !strcasecmp(mtype_of_result, "i"))
00148          type_of_result = INT_RESULT;
00149       else if (!strcasecmp(mtype_of_result, "hex")
00150           || !strcasecmp(mtype_of_result, "h"))
00151          type_of_result = HEX_RESULT;
00152       else if (!strcasecmp(mtype_of_result, "char")
00153           || !strcasecmp(mtype_of_result, "c"))
00154          type_of_result = CHAR_RESULT;
00155       else {
00156          ast_log(LOG_WARNING, "Unknown type of result requested '%s'.\n",
00157                mtype_of_result);
00158          return -1;
00159       }
00160    }
00161 
00162    if (!mvalue1 || !mvalue2) {
00163       ast_log(LOG_WARNING,
00164             "Supply all the parameters - just this once, please\n");
00165       return -1;
00166    }
00167 
00168    if (sscanf(mvalue1, "%lf", &fnum1) != 1) {
00169       ast_log(LOG_WARNING, "'%s' is not a valid number\n", mvalue1);
00170       return -1;
00171    }
00172 
00173    if (sscanf(mvalue2, "%lf", &fnum2) != 1) {
00174       ast_log(LOG_WARNING, "'%s' is not a valid number\n", mvalue2);
00175       return -1;
00176    }
00177 
00178    if (negvalue1)
00179       fnum1 = 0 - fnum1;
00180 
00181    switch (iaction) {
00182    case ADDFUNCTION:
00183       ftmp = fnum1 + fnum2;
00184       break;
00185    case DIVIDEFUNCTION:
00186       if (fnum2 <= 0)
00187          ftmp = 0;         /* can't do a divide by 0 */
00188       else
00189          ftmp = (fnum1 / fnum2);
00190       break;
00191    case MULTIPLYFUNCTION:
00192       ftmp = (fnum1 * fnum2);
00193       break;
00194    case SUBTRACTFUNCTION:
00195       ftmp = (fnum1 - fnum2);
00196       break;
00197    case MODULUSFUNCTION:
00198       {
00199          int inum1 = fnum1;
00200          int inum2 = fnum2;
00201 
00202          ftmp = (inum1 % inum2);
00203 
00204          break;
00205       }
00206    case GTFUNCTION:
00207       ast_copy_string(buf, (fnum1 > fnum2) ? "TRUE" : "FALSE", len);
00208       break;
00209    case LTFUNCTION:
00210       ast_copy_string(buf, (fnum1 < fnum2) ? "TRUE" : "FALSE", len);
00211       break;
00212    case GTEFUNCTION:
00213       ast_copy_string(buf, (fnum1 >= fnum2) ? "TRUE" : "FALSE", len);
00214       break;
00215    case LTEFUNCTION:
00216       ast_copy_string(buf, (fnum1 <= fnum2) ? "TRUE" : "FALSE", len);
00217       break;
00218    case EQFUNCTION:
00219       ast_copy_string(buf, (fnum1 == fnum2) ? "TRUE" : "FALSE", len);
00220       break;
00221    default:
00222       ast_log(LOG_WARNING,
00223             "Something happened that neither of us should be proud of %d\n",
00224             iaction);
00225       return -1;
00226    }
00227 
00228    if (iaction < GTFUNCTION || iaction > EQFUNCTION) {
00229       if (type_of_result == FLOAT_RESULT)
00230          snprintf(buf, len, "%f", ftmp);
00231       else if (type_of_result == INT_RESULT)
00232          snprintf(buf, len, "%i", (int) ftmp);
00233       else if (type_of_result == HEX_RESULT)
00234          snprintf(buf, len, "%x", (unsigned int) ftmp);
00235       else if (type_of_result == CHAR_RESULT)
00236          snprintf(buf, len, "%c", (unsigned char) ftmp);
00237    }
00238 
00239    return 0;
00240 }

static int unload_module ( void   )  [static]

Definition at line 258 of file func_math.c.

References ast_custom_function_unregister(), and math_function.

00259 {
00260    return ast_custom_function_unregister(&math_function);
00261 }


Variable Documentation

struct ast_custom_function math_function [static]

Definition at line 242 of file func_math.c.

Referenced by load_module(), and unload_module().


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