mirror of https://github.com/asterisk/asterisk
add MATH() dialplan function (bug #4473, with mods)
deprecate the Math() application git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5895 65c4cc65-6c06-0410-ace0-fbb531ad65f31.2-netsec
Kevin P. Fleming
20 years ago
parent
f3efc756ad
commit
79392ea53b
@ -0,0 +1,237 @@
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/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Maths relatad dialplan functions
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*
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* Copyright (C) 2004 - 2005, Andy Powell
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*
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* Updated by Mark Spencer <markster@digium.com>
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include "asterisk.h"
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/* ASTERISK_FILE_VERSION(__FILE__, "$Revision$") */
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/logger.h"
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#include "asterisk/utils.h"
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#include "asterisk/app.h"
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#include "asterisk/config.h"
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enum TypeOfFunctions
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{
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ADDFUNCTION,
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DIVIDEFUNCTION,
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MULTIPLYFUNCTION,
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SUBTRACTFUNCTION,
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MODULUSFUNCTION,
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GTFUNCTION,
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LTFUNCTION,
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GTEFUNCTION,
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LTEFUNCTION,
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EQFUNCTION
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};
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enum TypeOfResult
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{
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FLOAT_RESULT,
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INT_RESULT,
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HEX_RESULT,
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CHAR_RESULT
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};
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static char *builtin_function_math(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
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{
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int argc;
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char *argv[2];
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char *args;
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float fnum1;
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float fnum2;
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float ftmp = 0;
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char *op;
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int iaction=-1;
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int type_of_result=FLOAT_RESULT;
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/* dunno, big calulations :D */
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char user_result[30];
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char *mvalue1, *mvalue2=NULL, *mtype_of_result;
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if (!data || ast_strlen_zero(data)) {
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ast_log(LOG_WARNING, "Syntax: Math(<number1><op><number 2>[,<type_of_result>]) - missing argument!\n");
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return NULL;
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}
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args = ast_strdupa(data);
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argc = ast_separate_app_args(args, '|', argv, sizeof(argv) / sizeof(argv[0]));
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if (argc < 1) {
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ast_log(LOG_WARNING, "Syntax: Math(<number1><op><number 2>[,<type_of_result>]) - missing argument!\n");
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return NULL;
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}
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mvalue1 = argv[0];
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if ((op = strchr(mvalue1, '+'))) {
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iaction = ADDFUNCTION;
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*op = '\0';
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} else if ((op = strchr(mvalue1, '-'))) {
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iaction = SUBTRACTFUNCTION;
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*op = '\0';
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} else if ((op = strchr(mvalue1, '*'))) {
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iaction = MULTIPLYFUNCTION;
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*op = '\0';
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} else if ((op = strchr(mvalue1, '/'))) {
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iaction = DIVIDEFUNCTION;
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*op = '\0';
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} else if ((op = strchr(mvalue1, '%'))) {
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iaction = MODULUSFUNCTION;
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*op = '\0';
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} else if ((op = strchr(mvalue1, '>'))) {
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iaction = GTFUNCTION;
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*op = '\0';
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if (*(op+1) == '=') {
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*++op = '\0';
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iaction = GTEFUNCTION;
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}
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} else if ((op = strchr(mvalue1, '<'))) {
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iaction = LTFUNCTION;
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*op = '\0';
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if (*(op+1) == '=') {
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*++op = '\0';
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iaction = LTEFUNCTION;
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}
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} else if ((op = strchr(mvalue1, '='))) {
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iaction = GTFUNCTION;
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*op = '\0';
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if (*(op+1) == '=') {
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*++op = '\0';
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iaction = EQFUNCTION;
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} else
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op = NULL;
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}
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if (op)
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mvalue2 = op + 1;
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/* detect wanted type of result */
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mtype_of_result = argv[1];
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if (mtype_of_result)
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{
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if (!strcasecmp(mtype_of_result,"float") || !strcasecmp(mtype_of_result,"f"))
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type_of_result=FLOAT_RESULT;
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else if (!strcasecmp(mtype_of_result,"int") || !strcasecmp(mtype_of_result,"i"))
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type_of_result=INT_RESULT;
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else if (!strcasecmp(mtype_of_result,"hex") || !strcasecmp(mtype_of_result,"h"))
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type_of_result=HEX_RESULT;
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else if (!strcasecmp(mtype_of_result,"char") || !strcasecmp(mtype_of_result,"c"))
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type_of_result=CHAR_RESULT;
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else
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{
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ast_log(LOG_WARNING, "Unknown type of result requested '%s'.\n", mtype_of_result);
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return NULL;
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}
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}
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if (!mvalue1 || !mvalue2) {
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ast_log(LOG_WARNING, "Supply all the parameters - just this once, please\n");
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return NULL;
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}
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if (sscanf(mvalue1, "%f", &fnum1) != 1) {
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ast_log(LOG_WARNING, "'%s' is not a valid number\n", mvalue1);
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return NULL;
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}
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if (sscanf(mvalue2, "%f", &fnum2) != 1) {
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ast_log(LOG_WARNING, "'%s' is not a valid number\n", mvalue2);
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return NULL;
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}
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switch (iaction) {
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case ADDFUNCTION :
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ftmp = fnum1 + fnum2;
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break;
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case DIVIDEFUNCTION :
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if (fnum2 <= 0)
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ftmp = 0; /* can't do a divide by 0 */
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else
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ftmp = (fnum1 / fnum2);
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break;
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case MULTIPLYFUNCTION :
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ftmp = (fnum1 * fnum2);
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break;
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case SUBTRACTFUNCTION :
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ftmp = (fnum1 - fnum2);
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break;
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case MODULUSFUNCTION :
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{
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int inum1 = fnum1;
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int inum2 = fnum2;
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ftmp = (inum1 % inum2);
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break;
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}
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case GTFUNCTION :
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ast_copy_string (user_result, (fnum1 > fnum2)?"TRUE":"FALSE", sizeof (user_result));
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break;
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case LTFUNCTION :
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ast_copy_string (user_result, (fnum1 < fnum2)?"TRUE":"FALSE", sizeof (user_result));
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break;
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case GTEFUNCTION :
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ast_copy_string (user_result, (fnum1 >= fnum2)?"TRUE":"FALSE", sizeof (user_result));
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break;
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case LTEFUNCTION :
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ast_copy_string (user_result, (fnum1 <= fnum2)?"TRUE":"FALSE", sizeof (user_result));
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break;
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case EQFUNCTION :
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ast_copy_string (user_result, (fnum1 == fnum2)?"TRUE":"FALSE", sizeof (user_result));
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break;
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default :
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ast_log(LOG_WARNING, "Something happened that neither of us should be proud of %d\n", iaction);
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return NULL;
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}
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if (iaction < GTFUNCTION || iaction > EQFUNCTION) {
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if (type_of_result == FLOAT_RESULT)
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snprintf(user_result, sizeof(user_result), "%f", ftmp);
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else if (type_of_result == INT_RESULT)
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snprintf(user_result, sizeof(user_result), "%i", (int) ftmp);
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else if (type_of_result == HEX_RESULT)
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snprintf(user_result, sizeof(user_result), "%x", (unsigned int) ftmp);
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else if (type_of_result == CHAR_RESULT)
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snprintf(user_result, sizeof(user_result), "%c", (unsigned char) ftmp);
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}
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ast_copy_string(buf, user_result, len);
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return buf;
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}
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#ifndef BUILTIN_FUNC
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static
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#endif /* BUILTIN_FUNC */
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struct ast_custom_function math_function = {
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.name = "MATH",
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.synopsis = "Performs Mathematical Functions",
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.syntax = "MATH(<number1><op><number 2>[,<type_of_result>])",
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.desc = "Perform calculation on number 1 to number 2. Valid ops are: \n"
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" +,-,/,*,%,<,>,>=,<=,==\n"
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"and behave as their C equivalents.\n"
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"<type_of_result> - wanted type of result:\n"
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" f, float - float(default)\n"
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" i, int - integer,\n"
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" h, hex - hex,\n"
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" c, char - char\n"
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"Example: Set(i=${MATH(123%16,int)}) - sets var i=11",
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.read = builtin_function_math
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};
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