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/*
* Asterisk -- A telephony toolkit for Linux.
*
* While Loop and ExecIf Implementations
*
* Copyright 2004 - 2005, Anthony Minessale <anthmct@yahoo.com>
*
* Anthony Minessale <anthmct@yahoo.com>
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/utils.h"
#include "asterisk/config.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/lock.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#define ALL_DONE(u,ret) {LOCAL_USER_REMOVE(u); return ret;}
static char *exec_app = "ExecIf";
static char *exec_desc = " ExecIF (<expr>|<app>|<data>)\n"
"If <expr> is true, execute and return the result of <app>(<data>).\n"
"If <expr> is true, but <app> is not found, then the application\n"
"will return a non-zero value.";
static char *exec_synopsis = "ExecIF (<expr>|<app>|<data>)";
static char *start_app = "While";
static char *start_desc = " While(<expr>)\n"
"Start a While Loop. Execution will return to this point when\n"
"EndWhile is called until expr is no longer true.\n";
static char *start_synopsis = "Start A While Loop";
static char *stop_app = "EndWhile";
static char *stop_desc = " EndWhile()\n"
"Return to the previous called While\n\n";
static char *stop_synopsis = "End A While Loop";
static char *tdesc = "While Loops and Conditional Execution";
STANDARD_LOCAL_USER;
LOCAL_USER_DECL;
static int execif_exec(struct ast_channel *chan, void *data) {
int res=0;
struct localuser *u;
char *myapp = NULL;
char *mydata = NULL;
char *expr = NULL;
struct ast_app *app = NULL;
LOCAL_USER_ADD(u);
expr = ast_strdupa((char *) data);
if ((myapp = strchr(expr,'|'))) {
*myapp = '\0';
myapp++;
if ((mydata = strchr(myapp,'|'))) {
*mydata = '\0';
mydata++;
} else
mydata = "";
if (ast_true(expr)) {
if ((app = pbx_findapp(myapp))) {
res = pbx_exec(chan, app, mydata, 1);
} else {
ast_log(LOG_WARNING, "Count not find application! (%s)\n", myapp);
res = -1;
}
}
} else {
ast_log(LOG_ERROR,"Invalid Syntax.\n");
res = -1;
}
ALL_DONE(u,res);
}
#define VAR_SIZE 64
static char *get_index(struct ast_channel *chan, const char *prefix, int index) {
char varname[VAR_SIZE];
snprintf(varname, VAR_SIZE, "%s_%d", prefix, index);
return pbx_builtin_getvar_helper(chan, varname);
}
static int _while_exec(struct ast_channel *chan, void *data, int end)
{
int res=0;
struct localuser *u;
char *while_pri = NULL;
char *goto_str = NULL, *my_name = NULL;
char *condition = NULL, *label = NULL;
char varname[VAR_SIZE], end_varname[VAR_SIZE];
const char *prefix = "WHILE";
size_t size=0;
int used_index_i = -1, x=0;
char used_index[VAR_SIZE] = "0", new_index[VAR_SIZE] = "0";
if (!chan) {
/* huh ? */
return -1;
}
LOCAL_USER_ADD(u);
/* dont want run away loops if the chan isn't even up
this is up for debate since it slows things down a tad ......
*/
if (ast_waitfordigit(chan,1) < 0)
ALL_DONE(u,-1);
for (x=0;;x++) {
if (get_index(chan, prefix, x)) {
used_index_i = x;
} else
break;
}
snprintf(used_index, VAR_SIZE, "%d", used_index_i);
snprintf(new_index, VAR_SIZE, "%d", used_index_i + 1);
if (!end) {
condition = ast_strdupa((char *) data);
}
size = strlen(chan->context) + strlen(chan->exten) + 32;
my_name = alloca(size);
memset(my_name, 0, size);
snprintf(my_name, size, "%s_%s_%d", chan->context, chan->exten, chan->priority);
if (!label || ast_strlen_zero(label)) {
if (end)
label = used_index;
else if (!(label = pbx_builtin_getvar_helper(chan, my_name))) {
label = new_index;
pbx_builtin_setvar_helper(chan, my_name, label);
}
}
snprintf(varname, VAR_SIZE, "%s_%s", prefix, label);
while_pri = pbx_builtin_getvar_helper(chan, varname);
if ((while_pri = pbx_builtin_getvar_helper(chan, varname)) && !end) {
snprintf(end_varname,VAR_SIZE,"END_%s",varname);
}
if (!end && !ast_true(condition)) {
/* Condition Met (clean up helper vars) */
pbx_builtin_setvar_helper(chan, varname, NULL);
pbx_builtin_setvar_helper(chan, my_name, NULL);
snprintf(end_varname,VAR_SIZE,"END_%s",varname);
if ((goto_str=pbx_builtin_getvar_helper(chan, end_varname))) {
pbx_builtin_setvar_helper(chan, end_varname, NULL);
ast_parseable_goto(chan, goto_str);
}
ALL_DONE(u,res);
}
if (!end && !while_pri) {
size = strlen(chan->context) + strlen(chan->exten) + 32;
goto_str = alloca(size);
memset(goto_str, 0, size);
snprintf(goto_str, size, "%s|%s|%d", chan->context, chan->exten, chan->priority);
pbx_builtin_setvar_helper(chan, varname, goto_str);
}
else if (end && while_pri) {
/* END of loop */
snprintf(end_varname, VAR_SIZE, "END_%s", varname);
if (! pbx_builtin_getvar_helper(chan, end_varname)) {
size = strlen(chan->context) + strlen(chan->exten) + 32;
goto_str = alloca(size);
memset(goto_str, 0, size);
snprintf(goto_str, size, "%s|%s|%d", chan->context, chan->exten, chan->priority+1);
pbx_builtin_setvar_helper(chan, end_varname, goto_str);
}
ast_parseable_goto(chan, while_pri);
}
ALL_DONE(u, res);
}
static int while_start_exec(struct ast_channel *chan, void *data) {
return _while_exec(chan, data, 0);
}
static int while_end_exec(struct ast_channel *chan, void *data) {
return _while_exec(chan, data, 1);
}
int unload_module(void)
{
STANDARD_HANGUP_LOCALUSERS;
ast_unregister_application(start_app);
ast_unregister_application(exec_app);
return ast_unregister_application(stop_app);
}
int load_module(void)
{
ast_register_application(start_app, while_start_exec, start_synopsis, start_desc);
ast_register_application(exec_app, execif_exec, exec_synopsis, exec_desc);
return ast_register_application(stop_app, while_end_exec, stop_synopsis, stop_desc);
}
char *description(void)
{
return tdesc;
}
int usecount(void)
{
int res;
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}
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