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  • /*
     * Asterisk -- A telephony toolkit for Linux.
     *
     * Eval application
     *
    
     * Copyright (c) 2004 - 2005, Tilghman Lesher.  All rights reserved.
    
     *
     * Tilghman Lesher <app_eval__v001@the-tilghman.com>
     *
     * $Id$
     *
     * This code is released by the author with no restrictions on usage.
     *
     */
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <unistd.h>
    #include <string.h>
    
    
    #include "asterisk.h"
    
    ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
    
    
    #include "asterisk/file.h"
    #include "asterisk/logger.h"
    #include "asterisk/options.h"
    #include "asterisk/channel.h"
    #include "asterisk/pbx.h"
    #include "asterisk/module.h"
    
    
    /* Maximum length of any variable */
    #define MAXRESULT	1024
    
    static char *tdesc = "Reevaluates strings";
    
    static char *app_eval = "Eval";
    
    
    static char *eval_synopsis = "Evaluates a string";
    
    
    static char *eval_descrip =
    
    "Usage: Eval(newvar=somestring)\n"
    
    "  Normally Asterisk evaluates variables inline.  But what if you want to\n"
    "store variable offsets in a database, to be evaluated later?  Eval is\n"
    "the answer, by allowing a string to be evaluated twice in the dialplan,\n"
    "the first time as part of the normal dialplan, and the second using Eval.\n";
    
    STANDARD_LOCAL_USER;
    
    LOCAL_USER_DECL;
    
    static int eval_exec(struct ast_channel *chan, void *data)
    {
    	int res=0;
    	struct localuser *u;
    	char *s, *newvar=NULL, tmp[MAXRESULT];
    
    	static int dep_warning = 0;
    
    	if (!dep_warning) {
    		ast_log(LOG_WARNING, "This application has been deprecated in favor of the dialplan function, EVAL\n");
    		dep_warning = 1;
    	}
    
    
    	LOCAL_USER_ADD(u);
    
    	/* Check and parse arguments */
    	if (data) {
    		s = ast_strdupa((char *)data);
    		if (s) {
    			newvar = strsep(&s, "=");
    			if (newvar && (newvar[0] != '\0')) {
    				memset(tmp, 0, MAXRESULT);
    				pbx_substitute_variables_helper(chan, s, tmp, MAXRESULT - 1);
    				pbx_builtin_setvar_helper(chan, newvar, tmp);
    			}
    		} else {
    			ast_log(LOG_ERROR, "Out of memory\n");
    			res = -1;
    		}
    	}
    
    	LOCAL_USER_REMOVE(u);
    	return res;
    }
    
    int unload_module(void)
    {
    	STANDARD_HANGUP_LOCALUSERS;
    	return ast_unregister_application(app_eval);
    }
    
    int load_module(void)
    {
    	return ast_register_application(app_eval, eval_exec, eval_synopsis, eval_descrip);
    }
    
    char *description(void)
    {
    	return tdesc;
    }
    
    int usecount(void)
    {
    	int res;
    	STANDARD_USECOUNT(res);
    	return res;
    }
    
    char *key()
    {
    	return ASTERISK_GPL_KEY;
    }