363 lines
9.7 KiB
C
363 lines
9.7 KiB
C
/*
|
|
* Asterisk -- An open source telephony toolkit.
|
|
*
|
|
* Copyright 2004 - 2005, Anthony Minessale <anthmct@yahoo.com>
|
|
*
|
|
* Anthony Minessale <anthmct@yahoo.com>
|
|
*
|
|
* See http://www.asterisk.org for more information about
|
|
* the Asterisk project. Please do not directly contact
|
|
* any of the maintainers of this project for assistance;
|
|
* the project provides a web site, mailing lists and IRC
|
|
* channels for your use.
|
|
*
|
|
* This program is free software, distributed under the terms of
|
|
* the GNU General Public License Version 2. See the LICENSE file
|
|
* at the top of the source tree.
|
|
*/
|
|
|
|
/*! \file
|
|
*
|
|
* \brief While Loop Implementation
|
|
*
|
|
* \author Anthony Minessale <anthmct@yahoo.com>
|
|
*
|
|
* \ingroup applications
|
|
*/
|
|
|
|
/*** MODULEINFO
|
|
<support_level>core</support_level>
|
|
***/
|
|
|
|
#include "asterisk.h"
|
|
|
|
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
|
|
|
|
#include "asterisk/pbx.h"
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/channel.h"
|
|
|
|
/*** DOCUMENTATION
|
|
<application name="While" language="en_US">
|
|
<synopsis>
|
|
Start a while loop.
|
|
</synopsis>
|
|
<syntax>
|
|
<parameter name="expr" required="true" />
|
|
</syntax>
|
|
<description>
|
|
<para>Start a While Loop. Execution will return to this point when
|
|
<literal>EndWhile()</literal> is called until expr is no longer true.</para>
|
|
</description>
|
|
<see-also>
|
|
<ref type="application">EndWhile</ref>
|
|
<ref type="application">ExitWhile</ref>
|
|
<ref type="application">ContinueWhile</ref>
|
|
</see-also>
|
|
</application>
|
|
<application name="EndWhile" language="en_US">
|
|
<synopsis>
|
|
End a while loop.
|
|
</synopsis>
|
|
<syntax />
|
|
<description>
|
|
<para>Return to the previous called <literal>While()</literal>.</para>
|
|
</description>
|
|
<see-also>
|
|
<ref type="application">While</ref>
|
|
<ref type="application">ExitWhile</ref>
|
|
<ref type="application">ContinueWhile</ref>
|
|
</see-also>
|
|
</application>
|
|
<application name="ExitWhile" language="en_US">
|
|
<synopsis>
|
|
End a While loop.
|
|
</synopsis>
|
|
<syntax />
|
|
<description>
|
|
<para>Exits a <literal>While()</literal> loop, whether or not the conditional has been satisfied.</para>
|
|
</description>
|
|
<see-also>
|
|
<ref type="application">While</ref>
|
|
<ref type="application">EndWhile</ref>
|
|
<ref type="application">ContinueWhile</ref>
|
|
</see-also>
|
|
</application>
|
|
<application name="ContinueWhile" language="en_US">
|
|
<synopsis>
|
|
Restart a While loop.
|
|
</synopsis>
|
|
<syntax />
|
|
<description>
|
|
<para>Returns to the top of the while loop and re-evaluates the conditional.</para>
|
|
</description>
|
|
<see-also>
|
|
<ref type="application">While</ref>
|
|
<ref type="application">EndWhile</ref>
|
|
<ref type="application">ExitWhile</ref>
|
|
</see-also>
|
|
</application>
|
|
***/
|
|
|
|
static char *start_app = "While";
|
|
static char *stop_app = "EndWhile";
|
|
static char *exit_app = "ExitWhile";
|
|
static char *continue_app = "ContinueWhile";
|
|
|
|
#define VAR_SIZE 64
|
|
|
|
|
|
static const char *get_index(struct ast_channel *chan, const char *prefix, int idx) {
|
|
char varname[VAR_SIZE];
|
|
|
|
snprintf(varname, VAR_SIZE, "%s_%d", prefix, idx);
|
|
return pbx_builtin_getvar_helper(chan, varname);
|
|
}
|
|
|
|
static struct ast_exten *find_matching_priority(struct ast_context *c, const char *exten, int priority, const char *callerid)
|
|
{
|
|
struct ast_exten *e;
|
|
struct ast_include *i;
|
|
struct ast_context *c2;
|
|
|
|
for (e=ast_walk_context_extensions(c, NULL); e; e=ast_walk_context_extensions(c, e)) {
|
|
if (ast_extension_match(ast_get_extension_name(e), exten)) {
|
|
int needmatch = ast_get_extension_matchcid(e);
|
|
if ((needmatch && ast_extension_match(ast_get_extension_cidmatch(e), callerid)) ||
|
|
(!needmatch)) {
|
|
/* This is the matching extension we want */
|
|
struct ast_exten *p;
|
|
for (p=ast_walk_extension_priorities(e, NULL); p; p=ast_walk_extension_priorities(e, p)) {
|
|
if (priority != ast_get_extension_priority(p))
|
|
continue;
|
|
return p;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* No match; run through includes */
|
|
for (i=ast_walk_context_includes(c, NULL); i; i=ast_walk_context_includes(c, i)) {
|
|
for (c2=ast_walk_contexts(NULL); c2; c2=ast_walk_contexts(c2)) {
|
|
if (!strcmp(ast_get_context_name(c2), ast_get_include_name(i))) {
|
|
e = find_matching_priority(c2, exten, priority, callerid);
|
|
if (e)
|
|
return e;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int find_matching_endwhile(struct ast_channel *chan)
|
|
{
|
|
struct ast_context *c;
|
|
int res=-1;
|
|
|
|
if (ast_rdlock_contexts()) {
|
|
ast_log(LOG_ERROR, "Failed to lock contexts list\n");
|
|
return -1;
|
|
}
|
|
|
|
for (c=ast_walk_contexts(NULL); c; c=ast_walk_contexts(c)) {
|
|
struct ast_exten *e;
|
|
|
|
if (!ast_rdlock_context(c)) {
|
|
if (!strcmp(ast_get_context_name(c), chan->context)) {
|
|
/* This is the matching context we want */
|
|
int cur_priority = chan->priority + 1, level=1;
|
|
|
|
for (e = find_matching_priority(c, chan->exten, cur_priority,
|
|
S_COR(chan->caller.id.number.valid, chan->caller.id.number.str, NULL));
|
|
e;
|
|
e = find_matching_priority(c, chan->exten, ++cur_priority,
|
|
S_COR(chan->caller.id.number.valid, chan->caller.id.number.str, NULL))) {
|
|
if (!strcasecmp(ast_get_extension_app(e), "WHILE")) {
|
|
level++;
|
|
} else if (!strcasecmp(ast_get_extension_app(e), "ENDWHILE")) {
|
|
level--;
|
|
}
|
|
|
|
if (level == 0) {
|
|
res = cur_priority;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ast_unlock_context(c);
|
|
if (res > 0) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ast_unlock_contexts();
|
|
return res;
|
|
}
|
|
|
|
static int _while_exec(struct ast_channel *chan, const char *data, int end)
|
|
{
|
|
int res=0;
|
|
const char *while_pri = NULL;
|
|
char *my_name = NULL;
|
|
const 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;
|
|
}
|
|
|
|
#if 0
|
|
/* don't want run away loops if the chan isn't even up
|
|
this is up for debate since it slows things down a tad ......
|
|
|
|
Debate is over... this prevents While/EndWhile from working
|
|
within the "h" extension. Not good.
|
|
*/
|
|
if (ast_waitfordigit(chan,1) < 0)
|
|
return -1;
|
|
#endif
|
|
|
|
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(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);
|
|
|
|
ast_channel_lock(chan);
|
|
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);
|
|
if ((while_pri = pbx_builtin_getvar_helper(chan, varname)) && !end) {
|
|
while_pri = ast_strdupa(while_pri);
|
|
snprintf(end_varname,VAR_SIZE,"END_%s",varname);
|
|
}
|
|
ast_channel_unlock(chan);
|
|
|
|
|
|
if ((!end && !pbx_checkcondition(condition)) || (end == 2)) {
|
|
/* Condition Met (clean up helper vars) */
|
|
const char *goto_str;
|
|
pbx_builtin_setvar_helper(chan, varname, NULL);
|
|
pbx_builtin_setvar_helper(chan, my_name, NULL);
|
|
snprintf(end_varname,VAR_SIZE,"END_%s",varname);
|
|
ast_channel_lock(chan);
|
|
if ((goto_str = pbx_builtin_getvar_helper(chan, end_varname))) {
|
|
ast_parseable_goto(chan, goto_str);
|
|
pbx_builtin_setvar_helper(chan, end_varname, NULL);
|
|
} else {
|
|
int pri = find_matching_endwhile(chan);
|
|
if (pri > 0) {
|
|
ast_verb(3, "Jumping to priority %d\n", pri);
|
|
chan->priority = pri;
|
|
} else {
|
|
ast_log(LOG_WARNING, "Couldn't find matching EndWhile? (While at %s@%s priority %d)\n", chan->context, chan->exten, chan->priority);
|
|
}
|
|
}
|
|
ast_channel_unlock(chan);
|
|
return res;
|
|
}
|
|
|
|
if (!end && !while_pri) {
|
|
char *goto_str;
|
|
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)) {
|
|
char *goto_str;
|
|
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);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int while_start_exec(struct ast_channel *chan, const char *data) {
|
|
return _while_exec(chan, data, 0);
|
|
}
|
|
|
|
static int while_end_exec(struct ast_channel *chan, const char *data) {
|
|
return _while_exec(chan, data, 1);
|
|
}
|
|
|
|
static int while_exit_exec(struct ast_channel *chan, const char *data) {
|
|
return _while_exec(chan, data, 2);
|
|
}
|
|
|
|
static int while_continue_exec(struct ast_channel *chan, const char *data)
|
|
{
|
|
int x;
|
|
const char *prefix = "WHILE", *while_pri=NULL;
|
|
|
|
for (x = 0; ; x++) {
|
|
const char *tmp = get_index(chan, prefix, x);
|
|
if (tmp)
|
|
while_pri = tmp;
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (while_pri)
|
|
ast_parseable_goto(chan, while_pri);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
int res;
|
|
|
|
res = ast_unregister_application(start_app);
|
|
res |= ast_unregister_application(stop_app);
|
|
res |= ast_unregister_application(exit_app);
|
|
res |= ast_unregister_application(continue_app);
|
|
|
|
return res;
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
int res;
|
|
|
|
res = ast_register_application_xml(start_app, while_start_exec);
|
|
res |= ast_register_application_xml(stop_app, while_end_exec);
|
|
res |= ast_register_application_xml(exit_app, while_exit_exec);
|
|
res |= ast_register_application_xml(continue_app, while_continue_exec);
|
|
|
|
return res;
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "While Loops and Conditional Execution");
|