314 lines
8.6 KiB
C
314 lines
8.6 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright 2004 - 2005, Anthony Minessale <anthmct@yahoo.com>
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*
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* Anthony Minessale <anthmct@yahoo.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief While Loop Implementation
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*
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* \author Anthony Minessale <anthmct@yahoo.com>
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*
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* \ingroup applications
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/file.h"
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#include "asterisk/logger.h"
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#include "asterisk/channel.h"
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#include "asterisk/utils.h"
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#include "asterisk/config.h"
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#include "asterisk/pbx.h"
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#include "asterisk/module.h"
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#include "asterisk/lock.h"
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#include "asterisk/options.h"
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static char *start_app = "While";
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static char *start_desc =
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" While(<expr>): Start a While Loop. Execution will return to this\n"
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"point when EndWhile() is called until expr is no longer true.\n";
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static char *start_synopsis = "Start a while loop";
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static char *stop_app = "EndWhile";
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static char *stop_desc =
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" EndWhile(): Return to the previous called While()\n";
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static char *stop_synopsis = "End a while loop";
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static char *exit_app = "ExitWhile";
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static char *exit_desc =
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" ExitWhile(): Exits a While() loop, whether or not the conditional has been satisfied.\n";
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static char *exit_synopsis = "End a While loop";
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static char *continue_app = "ContinueWhile";
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static char *continue_desc =
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" ContinueWhile(): Returns to the top of the while loop and re-evaluates the conditional.\n";
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static char *continue_synopsis = "Restart a While loop";
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#define VAR_SIZE 64
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static const char *get_index(struct ast_channel *chan, const char *prefix, int index) {
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char varname[VAR_SIZE];
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snprintf(varname, VAR_SIZE, "%s_%d", prefix, index);
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return pbx_builtin_getvar_helper(chan, varname);
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}
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static struct ast_exten *find_matching_priority(struct ast_context *c, const char *exten, int priority, const char *callerid)
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{
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struct ast_exten *e;
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struct ast_include *i;
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struct ast_context *c2;
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for (e=ast_walk_context_extensions(c, NULL); e; e=ast_walk_context_extensions(c, e)) {
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if (ast_extension_match(ast_get_extension_name(e), exten)) {
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int needmatch = ast_get_extension_matchcid(e);
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if ((needmatch && ast_extension_match(ast_get_extension_cidmatch(e), callerid)) ||
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(!needmatch)) {
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/* This is the matching extension we want */
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struct ast_exten *p;
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for (p=ast_walk_extension_priorities(e, NULL); p; p=ast_walk_extension_priorities(e, p)) {
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if (priority != ast_get_extension_priority(p))
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continue;
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return p;
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}
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}
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}
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}
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/* No match; run through includes */
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for (i=ast_walk_context_includes(c, NULL); i; i=ast_walk_context_includes(c, i)) {
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for (c2=ast_walk_contexts(NULL); c2; c2=ast_walk_contexts(c2)) {
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if (!strcmp(ast_get_context_name(c2), ast_get_include_name(i))) {
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e = find_matching_priority(c2, exten, priority, callerid);
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if (e)
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return e;
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}
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}
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}
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return NULL;
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}
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static int find_matching_endwhile(struct ast_channel *chan)
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{
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struct ast_context *c;
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int res=-1;
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if (ast_rdlock_contexts()) {
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ast_log(LOG_ERROR, "Failed to lock contexts list\n");
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return -1;
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}
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for (c=ast_walk_contexts(NULL); c; c=ast_walk_contexts(c)) {
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struct ast_exten *e;
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if (!ast_rdlock_context(c)) {
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if (!strcmp(ast_get_context_name(c), chan->context)) {
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/* This is the matching context we want */
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int cur_priority = chan->priority + 1, level=1;
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for (e = find_matching_priority(c, chan->exten, cur_priority, chan->cid.cid_num); e; e = find_matching_priority(c, chan->exten, ++cur_priority, chan->cid.cid_num)) {
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if (!strcasecmp(ast_get_extension_app(e), "WHILE")) {
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level++;
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} else if (!strcasecmp(ast_get_extension_app(e), "ENDWHILE")) {
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level--;
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}
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if (level == 0) {
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res = cur_priority;
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break;
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}
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}
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}
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ast_unlock_context(c);
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if (res > 0) {
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break;
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}
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}
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}
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ast_unlock_contexts();
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return res;
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}
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static int _while_exec(struct ast_channel *chan, void *data, int end)
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{
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int res=0;
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const char *while_pri = NULL;
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char *my_name = NULL;
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const char *condition = NULL, *label = NULL;
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char varname[VAR_SIZE], end_varname[VAR_SIZE];
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const char *prefix = "WHILE";
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size_t size=0;
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int used_index_i = -1, x=0;
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char used_index[VAR_SIZE] = "0", new_index[VAR_SIZE] = "0";
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if (!chan) {
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/* huh ? */
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return -1;
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}
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/* dont want run away loops if the chan isn't even up
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this is up for debate since it slows things down a tad ......
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*/
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if (ast_waitfordigit(chan,1) < 0)
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return -1;
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for (x=0;;x++) {
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if (get_index(chan, prefix, x)) {
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used_index_i = x;
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} else
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break;
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}
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snprintf(used_index, VAR_SIZE, "%d", used_index_i);
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snprintf(new_index, VAR_SIZE, "%d", used_index_i + 1);
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if (!end)
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condition = ast_strdupa(data);
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size = strlen(chan->context) + strlen(chan->exten) + 32;
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my_name = alloca(size);
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memset(my_name, 0, size);
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snprintf(my_name, size, "%s_%s_%d", chan->context, chan->exten, chan->priority);
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if (ast_strlen_zero(label)) {
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if (end)
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label = used_index;
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else if (!(label = pbx_builtin_getvar_helper(chan, my_name))) {
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label = new_index;
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pbx_builtin_setvar_helper(chan, my_name, label);
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}
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}
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snprintf(varname, VAR_SIZE, "%s_%s", prefix, label);
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while_pri = pbx_builtin_getvar_helper(chan, varname);
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if ((while_pri = pbx_builtin_getvar_helper(chan, varname)) && !end) {
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snprintf(end_varname,VAR_SIZE,"END_%s",varname);
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}
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if ((!end && !pbx_checkcondition(condition)) || (end == 2)) {
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/* Condition Met (clean up helper vars) */
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const char *goto_str;
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pbx_builtin_setvar_helper(chan, varname, NULL);
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pbx_builtin_setvar_helper(chan, my_name, NULL);
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snprintf(end_varname,VAR_SIZE,"END_%s",varname);
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if ((goto_str=pbx_builtin_getvar_helper(chan, end_varname))) {
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ast_parseable_goto(chan, goto_str);
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pbx_builtin_setvar_helper(chan, end_varname, NULL);
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} else {
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int pri = find_matching_endwhile(chan);
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if (pri > 0) {
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ast_verb(3, "Jumping to priority %d\n", pri);
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chan->priority = pri;
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} else {
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ast_log(LOG_WARNING, "Couldn't find matching EndWhile? (While at %s@%s priority %d)\n", chan->context, chan->exten, chan->priority);
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}
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}
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return res;
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}
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if (!end && !while_pri) {
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char *goto_str;
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size = strlen(chan->context) + strlen(chan->exten) + 32;
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goto_str = alloca(size);
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memset(goto_str, 0, size);
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snprintf(goto_str, size, "%s,%s,%d", chan->context, chan->exten, chan->priority);
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pbx_builtin_setvar_helper(chan, varname, goto_str);
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}
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else if (end && while_pri) {
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/* END of loop */
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snprintf(end_varname, VAR_SIZE, "END_%s", varname);
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if (! pbx_builtin_getvar_helper(chan, end_varname)) {
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char *goto_str;
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size = strlen(chan->context) + strlen(chan->exten) + 32;
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goto_str = alloca(size);
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memset(goto_str, 0, size);
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snprintf(goto_str, size, "%s,%s,%d", chan->context, chan->exten, chan->priority+1);
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pbx_builtin_setvar_helper(chan, end_varname, goto_str);
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}
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ast_parseable_goto(chan, while_pri);
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}
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return res;
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}
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static int while_start_exec(struct ast_channel *chan, void *data) {
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return _while_exec(chan, data, 0);
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}
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static int while_end_exec(struct ast_channel *chan, void *data) {
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return _while_exec(chan, data, 1);
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}
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static int while_exit_exec(struct ast_channel *chan, void *data) {
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return _while_exec(chan, data, 2);
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}
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static int while_continue_exec(struct ast_channel *chan, void *data)
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{
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int x;
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const char *prefix = "WHILE", *while_pri=NULL;
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for (x = 0; ; x++) {
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const char *tmp = get_index(chan, prefix, x);
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if (tmp)
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while_pri = tmp;
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else
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break;
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}
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if (while_pri)
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ast_parseable_goto(chan, while_pri);
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return 0;
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}
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static int unload_module(void)
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{
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int res;
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res = ast_unregister_application(start_app);
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res |= ast_unregister_application(stop_app);
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res |= ast_unregister_application(exit_app);
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res |= ast_unregister_application(continue_app);
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return res;
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}
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static int load_module(void)
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{
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int res;
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res = ast_register_application(start_app, while_start_exec, start_synopsis, start_desc);
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res |= ast_register_application(stop_app, while_end_exec, stop_synopsis, stop_desc);
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res |= ast_register_application(exit_app, while_exit_exec, exit_synopsis, exit_desc);
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res |= ast_register_application(continue_app, while_continue_exec, continue_synopsis, continue_desc);
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return res;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "While Loops and Conditional Execution");
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