pbx.c

				snprintf(buf + strlen(buf), size - strlen(buf), "%s=%s\n", var, val);
				if(strlen(buf) >= size) {
					ast_log(LOG_ERROR,"Data Buffer Size Exceeded!\n");
					break;
				}
				total++;
			} else 
				break;
		}
	}
	
	return total;
}

char *pbx_builtin_getvar_helper(struct ast_channel *chan, char *name) 
{
	struct ast_var_t *variables;
	struct varshead *headp;

	if (chan)
		headp=&chan->varshead;
	else
		headp=&globals;

	if (name) {
		AST_LIST_TRAVERSE(headp,variables,entries) {
			if (!strcmp(name, ast_var_name(variables)))
				return ast_var_value(variables);
		}
		if (headp != &globals) {
			/* Check global variables if we haven't already */
			headp = &globals;
			AST_LIST_TRAVERSE(headp,variables,entries) {
				if (!strcmp(name, ast_var_name(variables)))
					return ast_var_value(variables);
			}
		}
	}
	return NULL;
}

void pbx_builtin_setvar_helper(struct ast_channel *chan, char *name, char *value)
{
	struct ast_var_t *newvariable;
	struct varshead *headp;

	if (chan)
		headp = &chan->varshead;
	else
		headp = &globals;

	AST_LIST_TRAVERSE (headp, newvariable, entries) {
		if (strcasecmp(ast_var_name(newvariable), name) == 0) {
			/* there is already such a variable, delete it */
			AST_LIST_REMOVE(headp, newvariable, ast_var_t, entries);
			ast_var_delete(newvariable);
			break;
		}
	} 

	if (value) {
		if ((option_verbose > 1) && (headp == &globals))
			ast_verbose(VERBOSE_PREFIX_3 "Setting global variable '%s' to '%s'\n", name, value);
		newvariable = ast_var_assign(name, value);	
		AST_LIST_INSERT_HEAD(headp, newvariable, entries);
	}
}

int pbx_builtin_setvar(struct ast_channel *chan, void *data)
{
	char *name;
	char *value;
	char *stringp=NULL;

	if (!data || ast_strlen_zero(data)) {
		ast_log(LOG_WARNING, "Ignoring, since there is no variable to set\n");
		return 0;
	}

	stringp = ast_strdupa(data);
	name = strsep(&stringp,"=");
	value = strsep(&stringp,"\0"); 

	pbx_builtin_setvar_helper(chan, name, value);

	return(0);
}

int pbx_builtin_importvar(struct ast_channel *chan, void *data)
{
	char *name;
	char *value;
	char *stringp=NULL;
	char *channel;
	struct ast_channel *chan2=NULL;
	char tmp[4096]="";
	char *s;

	if (!data || ast_strlen_zero(data)) {
		ast_log(LOG_WARNING, "Ignoring, since there is no variable to set\n");
		return 0;
	}

	stringp = ast_strdupa(data);
	name = strsep(&stringp,"=");
	channel = strsep(&stringp,"|"); 
	value = strsep(&stringp,"\0");
	if (channel && value && name) {
		while((chan2 = ast_channel_walk_locked(chan2))) {
			if (!strcmp(chan2->name, channel))
				break;
			ast_mutex_unlock(&chan2->lock);
		}
		if (chan2) {
			s = alloca(strlen(value) + 4);
			if (s) {
				sprintf(s, "${%s}", value);
				pbx_substitute_variables_helper(chan2, s, tmp, sizeof(tmp) - 1);
			}
			ast_mutex_unlock(&chan2->lock);
		}
		pbx_builtin_setvar_helper(chan, name, tmp);
	}

	return(0);
}

static int pbx_builtin_setglobalvar(struct ast_channel *chan, void *data)
{
	char *name;
	char *value;
	char *stringp = NULL;

	if (!data || ast_strlen_zero(data)) {
		ast_log(LOG_WARNING, "Ignoring, since there is no variable to set\n");
		return 0;
	}

	stringp = data;
	name = strsep(&stringp, "=");
	value = strsep(&stringp, "\0"); 

	pbx_builtin_setvar_helper(NULL, name, value);

	return(0);
}

static int pbx_builtin_noop(struct ast_channel *chan, void *data)
{
	return 0;
}


void pbx_builtin_clear_globals(void)
{
	struct ast_var_t *vardata;
	while (!AST_LIST_EMPTY(&globals)) {
		vardata = AST_LIST_REMOVE_HEAD(&globals, ast_var_t, entries);
		ast_var_delete(vardata);
	}
}

static int pbx_checkcondition(char *condition) 
{
	return condition ? atoi(condition) : 0;
}

static int pbx_builtin_gotoif(struct ast_channel *chan, void *data)
{
	char *condition,*branch1,*branch2,*branch;
	char *s;
	int rc;
	char *stringp=NULL;

	if (!data || ast_strlen_zero(data)) {
		ast_log(LOG_WARNING, "Ignoring, since there is no variable to check\n");
		return 0;
	}
	
	s=ast_strdupa(data);
	stringp=s;
	condition=strsep(&stringp,"?");
	branch1=strsep(&stringp,":");
	branch2=strsep(&stringp,"");
	branch = pbx_checkcondition(condition) ? branch1 : branch2;
	
	if ((branch==NULL) || ast_strlen_zero(branch)) {
		ast_log(LOG_DEBUG, "Not taking any branch\n");
		return(0);
	}
	
	rc=pbx_builtin_goto(chan,branch);

	return(rc);
}           

static int pbx_builtin_saynumber(struct ast_channel *chan, void *data)
{
	int res = 0;
	char tmp[256];
	char *number = (char *) NULL;
	char *options = (char *) NULL;

	
	if (!data || ast_strlen_zero((char *)data)) {
                ast_log(LOG_WARNING, "SayNumber requires an argument (number)\n");
                return -1;
        }
        strncpy(tmp, (char *)data, sizeof(tmp)-1);
        number=tmp;
        strsep(&number, "|");
        options = strsep(&number, "|");
        if (options) { 
		if ( strcasecmp(options, "f") && strcasecmp(options,"m") && 
			strcasecmp(options, "c") && strcasecmp(options, "n") ) {
                   ast_log(LOG_WARNING, "SayNumber gender option is either 'f', 'm', 'c' or 'n'\n");
                   return -1;
		}
	}
	return res = ast_say_number(chan, atoi((char *) tmp), "", chan->language, options);
}

static int pbx_builtin_saydigits(struct ast_channel *chan, void *data)
{
	int res = 0;

	if (data)
		res = ast_say_digit_str(chan, (char *)data, "", chan->language);
	return res;
}
	
static int pbx_builtin_saycharacters(struct ast_channel *chan, void *data)
{
	int res = 0;

	if (data)
		res = ast_say_character_str(chan, (char *)data, "", chan->language);
	return res;
}
	
static int pbx_builtin_sayphonetic(struct ast_channel *chan, void *data)
{
	int res = 0;

	if (data)
		res = ast_say_phonetic_str(chan, (char *)data, "", chan->language);
	return res;
}
	
int load_pbx(void)
{
	int x;

	/* Initialize the PBX */
	if (option_verbose) {
		ast_verbose( "Asterisk PBX Core Initializing\n");
		ast_verbose( "Registering builtin applications:\n");
	}
        AST_LIST_HEAD_INIT(&globals);
	ast_cli_register(&show_applications_cli);
	ast_cli_register(&show_application_cli);
	ast_cli_register(&show_dialplan_cli);
	ast_cli_register(&show_switches_cli);

	/* Register builtin applications */
	for (x=0; x<sizeof(builtins) / sizeof(struct pbx_builtin); x++) {
		if (option_verbose)
			ast_verbose( VERBOSE_PREFIX_1 "[%s]\n", builtins[x].name);
		if (ast_register_application(builtins[x].name, builtins[x].execute, builtins[x].synopsis, builtins[x].description)) {
			ast_log(LOG_ERROR, "Unable to register builtin application '%s'\n", builtins[x].name);
			return -1;
		}
	}
	return 0;
}

/*
 * Lock context list functions ...
 */
int ast_lock_contexts()
{
	return ast_mutex_lock(&conlock);
}

int ast_unlock_contexts()
{
	return ast_mutex_unlock(&conlock);
}

/*
 * Lock context ...
 */
int ast_lock_context(struct ast_context *con)
{
	return ast_mutex_lock(&con->lock);
}

int ast_unlock_context(struct ast_context *con)
{
	return ast_mutex_unlock(&con->lock);
}

/*
 * Name functions ...
 */
const char *ast_get_context_name(struct ast_context *con)
{
	return con ? con->name : NULL;
}

const char *ast_get_extension_name(struct ast_exten *exten)
{
	return exten ? exten->exten : NULL;
}

const char *ast_get_extension_label(struct ast_exten *exten)
{
	return exten ? exten->label : NULL;
}

const char *ast_get_include_name(struct ast_include *inc)
{
	return inc ? inc->name : NULL;
}

const char *ast_get_ignorepat_name(struct ast_ignorepat *ip)
{
	return ip ? ip->pattern : NULL;
}

int ast_get_extension_priority(struct ast_exten *exten)
{
	return exten ? exten->priority : -1;
}

/*
 * Registrar info functions ...
 */
const char *ast_get_context_registrar(struct ast_context *c)
{
	return c ? c->registrar : NULL;
}

const char *ast_get_extension_registrar(struct ast_exten *e)
{
	return e ? e->registrar : NULL;
}

const char *ast_get_include_registrar(struct ast_include *i)
{
	return i ? i->registrar : NULL;
}

const char *ast_get_ignorepat_registrar(struct ast_ignorepat *ip)
{
	return ip ? ip->registrar : NULL;
}

int ast_get_extension_matchcid(struct ast_exten *e)
{
	return e ? e->matchcid : 0;
}

const char *ast_get_extension_cidmatch(struct ast_exten *e)
{
	return e ? e->cidmatch : NULL;
}

const char *ast_get_extension_app(struct ast_exten *e)
{
	return e ? e->app : NULL;
}

void *ast_get_extension_app_data(struct ast_exten *e)
{
	return e ? e->data : NULL;
}

const char *ast_get_switch_name(struct ast_sw *sw)
{
	return sw ? sw->name : NULL;
}

const char *ast_get_switch_data(struct ast_sw *sw)
{
	return sw ? sw->data : NULL;
}

const char *ast_get_switch_registrar(struct ast_sw *sw)
{
	return sw ? sw->registrar : NULL;
}

/*
 * Walking functions ...
 */
struct ast_context *ast_walk_contexts(struct ast_context *con)
{
	if (!con)
		return contexts;
	else
		return con->next;
}

struct ast_exten *ast_walk_context_extensions(struct ast_context *con,
	struct ast_exten *exten)
{
	if (!exten)
		return con ? con->root : NULL;
	else
		return exten->next;
}

struct ast_sw *ast_walk_context_switches(struct ast_context *con,
	struct ast_sw *sw)
{
	if (!sw)
		return con ? con->alts : NULL;
	else
		return sw->next;
}

struct ast_exten *ast_walk_extension_priorities(struct ast_exten *exten,
	struct ast_exten *priority)
{
	if (!priority)
		return exten;
	else
		return priority->peer;
}

struct ast_include *ast_walk_context_includes(struct ast_context *con,
	struct ast_include *inc)
{
	if (!inc)
		return con ? con->includes : NULL;
	else
		return inc->next;
}

struct ast_ignorepat *ast_walk_context_ignorepats(struct ast_context *con,
	struct ast_ignorepat *ip)
{
	if (!ip)
		return con ? con->ignorepats : NULL;
	else
		return ip->next;
}

int ast_context_verify_includes(struct ast_context *con)
{
	struct ast_include *inc;
	int res = 0;

	for (inc = ast_walk_context_includes(con, NULL); inc; inc = ast_walk_context_includes(con, inc))
		if (!ast_context_find(inc->rname)) {
			res = -1;
			ast_log(LOG_WARNING, "Context '%s' tries includes non-existant context '%s'\n",
					ast_get_context_name(con), inc->rname);
		}
	return res;
}


static int __ast_goto_if_exists(struct ast_channel *chan, char* context, char *exten, int priority, int async) 
{
	int (*goto_func)(struct ast_channel *chan, const char *context, const char *exten, int priority) = NULL;

	if(chan) {

		if (async) {
			goto_func = ast_async_goto;
		} else { 
			goto_func = ast_explicit_goto;
			priority--;
			if(priority < 0)
				priority = 0;
		}

		if (ast_exists_extension(chan, 
								 context ? context : chan->context,
								 exten ? exten : chan->exten,
								 priority,
								 chan->cid.cid_num)) {
			return goto_func(chan,
							 context ? context : chan->context,
							 exten ? exten : chan->exten,
							 priority);
		} else 
			return -3;
	}
	
	return -2;
}

int ast_goto_if_exists(struct ast_channel *chan, char* context, char *exten, int priority) {
	return __ast_goto_if_exists(chan, context, exten, priority, 0);
}

int ast_async_goto_if_exists(struct ast_channel *chan, char* context, char *exten, int priority) {
	return __ast_goto_if_exists(chan, context, exten, priority, 1);
}

int ast_parseable_goto(struct ast_channel *chan, const char *goto_string) 
{
	char *s;
	char *exten, *pri, *context;
	char *stringp=NULL;
	int ipri;
	int mode = 0;

	if (!goto_string || ast_strlen_zero(goto_string)) {
		ast_log(LOG_WARNING, "Goto requires an argument (optional context|optional extension|priority)\n");
		return -1;
	}
	s = ast_strdupa(goto_string);
	stringp=s;
	context = strsep(&stringp, "|");
	exten = strsep(&stringp, "|");
	if (!exten) {
		/* Only a priority in this one */
		pri = context;
		exten = NULL;
		context = NULL;
	} else {
		pri = strsep(&stringp, "|");
		if (!pri) {
			/* Only an extension and priority in this one */
			pri = exten;
			exten = context;
			context = NULL;
		}
	}
	if (*pri == '+') {
		mode = 1;
		pri++;
	} else if (*pri == '-') {
		mode = -1;
		pri++;
	}
	if (sscanf(pri, "%i", &ipri) != 1) {
		if ((ipri = ast_findlabel_extension(chan, context ? context : chan->context, (exten && strcasecmp(exten, "BYEXTENSION")) ? exten : chan->exten, 
			pri, chan->cid.cid_num)) < 1) {
			ast_log(LOG_WARNING, "Priority '%s' must be a number > 0, or valid label\n", pri);
			return -1;
		} else
			mode = 0;
	} 
	/* At this point we have a priority and maybe an extension and a context */

	if (exten && !strcasecmp(exten, "BYEXTENSION"))
		exten = NULL;

	if (mode) 
		ipri = chan->priority + (ipri * mode);

	/* This channel is currently in the PBX */
	ast_explicit_goto(chan, context, exten, ipri - 1);
	ast_cdr_update(chan);
	return 0;

}