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  • /*
     * Asterisk -- A telephony toolkit for Linux.
     *
     * While Loop and ExecIf Implementations
     * 
     * Copyright 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\n";
    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 = "";
    
    
    
    STANDARD_LOCAL_USER;
    
    LOCAL_USER_DECL;
    
    static int execif_exec(struct ast_channel *chan, void *data) {
    	int res=0;
        struct localuser *u;
    	LOCAL_USER_ADD(u);
    	char *myapp = NULL;
    	char *mydata = NULL;
    	char *expr = NULL;
    	struct ast_app *app = NULL;
    
    	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) && (app = pbx_findapp(myapp))) {
    			res = pbx_exec(chan, app, mydata, 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;
    }