app_while.c File Reference

While Loop Implementation. More...

#include "asterisk.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/channel.h"

Include dependency graph for app_while.c:

Go to the source code of this file.

Macros
#define	VAR_SIZE   64

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
static int	_while_exec (struct ast_channel *chan, const char *data, int end)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	find_matching_endwhile (struct ast_channel *chan)
static struct ast_exten *	find_matching_priority (struct ast_context *c, const char *exten, int priority, const char *callerid)
static const char *	get_index (struct ast_channel *chan, const char *prefix, int idx)
static int	load_module (void)
static int	unload_module (void)
static int	while_continue_exec (struct ast_channel *chan, const char *data)
static int	while_end_exec (struct ast_channel *chan, const char *data)
static int	while_exit_exec (struct ast_channel *chan, const char *data)
static int	while_start_exec (struct ast_channel *chan, const char *data)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "While Loops and Conditional Execution" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }
static const struct ast_module_info *	ast_module_info = &__mod_info
static char *	continue_app = "ContinueWhile"
static char *	exit_app = "ExitWhile"
static char *	start_app = "While"
static char *	stop_app = "EndWhile"

Detailed Description

While Loop Implementation.

Author

Anthony Minessale anthm.nosp@m.ct@y.nosp@m.ahoo..nosp@m.com

Definition in file app_while.c.

Macro Definition Documentation

VAR_SIZE

#define VAR_SIZE   64

Definition at line 105 of file app_while.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 362 of file app_while.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 362 of file app_while.c.

_while_exec()

static int _while_exec ( struct ast_channel *  chan, const char *  data, int  end  )

static

Definition at line 197 of file app_while.c.

{
    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(ast_channel_context(chan)) + strlen(ast_channel_exten(chan)) + 32;
    my_name = ast_alloca(size);
    memset(my_name, 0, size);
    snprintf(my_name, size, "%s_%s_%d", ast_channel_context(chan), ast_channel_exten(chan), ast_channel_priority(chan));
 
    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);
                ast_channel_priority_set(chan, pri);
            } else {
                ast_log(LOG_WARNING, "Couldn't find matching EndWhile? (While at %s@%s priority %d)\n", ast_channel_context(chan), ast_channel_exten(chan), ast_channel_priority(chan));
            }
        }
        ast_channel_unlock(chan);
        return res;
    }
 
    if (!end && !while_pri) {
        char *goto_str;
        size = strlen(ast_channel_context(chan)) + strlen(ast_channel_exten(chan)) + 32;
        goto_str = ast_alloca(size);
        memset(goto_str, 0, size);
        snprintf(goto_str, size, "%s,%s,%d", ast_channel_context(chan), ast_channel_exten(chan), ast_channel_priority(chan));
        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(ast_channel_context(chan)) + strlen(ast_channel_exten(chan)) + 32;
            goto_str = ast_alloca(size);
            memset(goto_str, 0, size);
            snprintf(goto_str, size, "%s,%s,%d", ast_channel_context(chan), ast_channel_exten(chan), ast_channel_priority(chan)+1);
            pbx_builtin_setvar_helper(chan, end_varname, goto_str);
        }
        ast_parseable_goto(chan, while_pri);
    }
 
    return res;
}

References ast_alloca, ast_channel_context(), ast_channel_exten(), ast_channel_lock, ast_channel_priority(), ast_channel_priority_set(), ast_channel_unlock, ast_log, ast_parseable_goto(), ast_strdupa, ast_verb, ast_waitfordigit(), ast_exten::data, end, find_matching_endwhile(), get_index(), ast_exten::label, LOG_WARNING, NULL, pbx_builtin_getvar_helper(), pbx_builtin_setvar_helper(), pbx_checkcondition(), prefix, and VAR_SIZE.

Referenced by while_end_exec(), while_exit_exec(), and while_start_exec().

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 362 of file app_while.c.

find_matching_endwhile()

static int find_matching_endwhile ( struct ast_channel *  chan )

static

Definition at line 152 of file app_while.c.

{
    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), ast_channel_context(chan))) {
                /* This is the matching context we want */
                int cur_priority = ast_channel_priority(chan) + 1, level=1;
 
                for (e = find_matching_priority(c, ast_channel_exten(chan), cur_priority,
                    S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL));
                    e;
                    e = find_matching_priority(c, ast_channel_exten(chan), ++cur_priority,
                        S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->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;
}

References ast_channel_caller(), ast_channel_context(), ast_channel_exten(), ast_channel_priority(), ast_get_context_name(), ast_get_extension_app(), ast_log, ast_rdlock_context(), ast_rdlock_contexts(), ast_unlock_context(), ast_unlock_contexts(), ast_walk_contexts(), c, find_matching_priority(), LOG_ERROR, NULL, and S_COR.

Referenced by _while_exec().

find_matching_priority()

static struct ast_exten * find_matching_priority ( struct ast_context *  c, const char *  exten, int  priority, const char *  callerid  )

static

Definition at line 115 of file app_while.c.

{
    struct ast_exten *e;
    struct ast_context *c2;
    int idx;
 
    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 (idx = 0; idx < ast_context_includes_count(c); idx++) {
        const struct ast_include *i = ast_context_includes_get(c, idx);
 
        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;
}

References ast_context_includes_count(), ast_context_includes_get(), ast_extension_match(), ast_get_context_name(), ast_get_extension_cidmatch(), ast_get_extension_matchcid(), ast_get_extension_name(), ast_get_extension_priority(), ast_get_include_name(), ast_walk_context_extensions(), ast_walk_contexts(), ast_walk_extension_priorities(), c, find_matching_priority(), NULL, and priority.

Referenced by find_matching_endwhile(), and find_matching_priority().

get_index()

static const char * get_index ( struct ast_channel *  chan, const char *  prefix, int  idx  )

static

Definition at line 108 of file app_while.c.

                                                                                    {
    char varname[VAR_SIZE];
 
    snprintf(varname, VAR_SIZE, "%s_%d", prefix, idx);
    return pbx_builtin_getvar_helper(chan, varname);
}

References pbx_builtin_getvar_helper(), prefix, and VAR_SIZE.

Referenced by _while_exec(), and while_continue_exec().

load_module()

static int load_module ( void  )

static

Definition at line 350 of file app_while.c.

{
    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;
}

References ast_register_application_xml, continue_app, exit_app, start_app, stop_app, while_continue_exec(), while_end_exec(), while_exit_exec(), and while_start_exec().

unload_module()

static int unload_module ( void  )

static

Definition at line 338 of file app_while.c.

{
    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;
}

References ast_unregister_application(), continue_app, exit_app, start_app, and stop_app.

while_continue_exec()

static int while_continue_exec ( struct ast_channel *  chan, const char *  data  )

static

Definition at line 319 of file app_while.c.

{
    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;
}

References ast_parseable_goto(), get_index(), NULL, prefix, and tmp().

Referenced by load_module().

while_end_exec()

static int while_end_exec ( struct ast_channel *  chan, const char *  data  )

static

Definition at line 311 of file app_while.c.

                                                                      {
    return _while_exec(chan, data, 1);
}

References _while_exec(), and ast_exten::data.

Referenced by load_module().

while_exit_exec()

static int while_exit_exec ( struct ast_channel *  chan, const char *  data  )

static

Definition at line 315 of file app_while.c.

                                                                       {
    return _while_exec(chan, data, 2);
}

References _while_exec(), and ast_exten::data.

Referenced by load_module().

while_start_exec()

static int while_start_exec ( struct ast_channel *  chan, const char *  data  )

static

Definition at line 307 of file app_while.c.

                                                                        {
    return _while_exec(chan, data, 0);
}

References _while_exec(), and ast_exten::data.

Referenced by load_module().

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "While Loops and Conditional Execution" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }

static

Definition at line 362 of file app_while.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 362 of file app_while.c.

continue_app

char* continue_app = "ContinueWhile"

static

Definition at line 103 of file app_while.c.

Referenced by load_module(), and unload_module().

exit_app

char* exit_app = "ExitWhile"

static

Definition at line 102 of file app_while.c.

Referenced by load_module(), and unload_module().

start_app

char* start_app = "While"

static

Definition at line 100 of file app_while.c.

Referenced by load_module(), and unload_module().

stop_app

char* stop_app = "EndWhile"

static

Definition at line 101 of file app_while.c.

Referenced by load_module(), and unload_module().