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/*
* Asterisk -- A telephony toolkit for Linux.
*
* Conditional logic dialplan functions
*
* Copyright (C) 2005, Digium, Inc.
* Portions Copyright (C) 2005, Anthony Minessale II
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#include <stdlib.h>
#include <string.h>
#include <sys/types.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" /* for ast_true */
static char *builtin_function_isnull(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
{
char *ret_true = "1", *ret_false = "0";
return data && *data ? ret_false : ret_true;
}
static char *builtin_function_exists(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
{
char *ret_true = "1", *ret_false = "0";
return data && *data ? ret_true : ret_false;
}
static char *builtin_function_if(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
{
char *ret = NULL;
char *mydata = NULL;
char *expr = NULL;
char *iftrue = NULL;
char *iffalse = NULL;
if((mydata = ast_strdupa(data))) {
expr = mydata;
if ((iftrue = strchr(mydata, '?'))) {
*iftrue = '\0';
iftrue++;
if ((iffalse = strchr(iftrue, ':'))) {
*iffalse = '\0';
iffalse++;
}
} else
iffalse = "";
if (expr && iftrue) {
ret = ast_true(expr) ? iftrue : iffalse;
strncpy(buf, ret, len);
ret = buf;
} else {
ast_log(LOG_WARNING, "Syntax $(if <expr>?[<truecond>][:<falsecond>])\n");
ret = NULL;
}
} else {
ast_log(LOG_WARNING, "Memory Error!\n");
ret = NULL;
}
return ret;
}
#ifndef BUILTIN_FUNC
static
#endif
struct ast_custom_function isnull_function = {
.name = "ISNULL",
.synopsis = "NULL Test: Returns 1 if NULL or 0 otherwise",
.syntax = "ISNULL(<data>)",
.read = builtin_function_isnull,
};
#ifndef BUILTIN_FUNC
static
#endif
struct ast_custom_function exists_function = {
.name = "EXISTS",
.synopsis = "Existence Test: Returns 1 if exists, 0 otherwise",
.syntax = "EXISTS(<data>)",
.read = builtin_function_exists,
};
#ifndef BUILTIN_FUNC
static
#endif
struct ast_custom_function if_function = {
.name = "IF",
.synopsis = "Conditional: Returns the data following '?' if true else the data following ':'",
.syntax = "IF(<expr>?<true>:<false>)",
.read = builtin_function_if,
};
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