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  • /*
     * Asterisk -- An open source telephony toolkit.
     *
     * Copyright (C) 2006, Digium, Inc.
     * Copyright (C) 2006, Claude Patry
     *
     * 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 Generate Random Number
    
     * \author Claude Patry <cpatry@gmail.com>
     * \author Tilghman Lesher ( http://asterisk.drunkcoder.com/ )
    
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     * \ingroup functions
    
    /*** MODULEINFO
    	<support_level>core</support_level>
     ***/
    
    
    #include "asterisk/channel.h"
    #include "asterisk/pbx.h"
    #include "asterisk/utils.h"
    #include "asterisk/app.h"
    
    
    /*** DOCUMENTATION
    	<function name="RAND" language="en_US">
    		<synopsis>
    
    			Choose a random number in a range.
    
    		</synopsis>
    		<syntax>
    			<parameter name="min" />
    			<parameter name="max" />
    		</syntax>
    		<description>
    
    			<para>Choose a random number between <replaceable>min</replaceable> and <replaceable>max</replaceable>.
    			<replaceable>min</replaceable> defaults to <literal>0</literal>, if not specified, while <replaceable>max</replaceable> defaults
    
    			to <literal>RAND_MAX</literal> (2147483647 on many systems).</para>
    
    			<example title="Set random number between 1 and 8, inclusive">
    			exten => s,1,Set(junky=${RAND(1,8)})
    			</example>
    
    		</description>
    	</function>
     ***/
    
    static int acf_rand_exec(struct ast_channel *chan, const char *cmd,
    
    			 char *parse, char *buffer, size_t buflen)
    
    {
    	int min_int, response_int, max_int;
    
    	AST_DECLARE_APP_ARGS(args,
    
    			     AST_APP_ARG(min);
    			     AST_APP_ARG(max);
    
    	AST_STANDARD_APP_ARGS(args, parse);
    
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    	if (ast_strlen_zero(args.min) || sscanf(args.min, "%30d", &min_int) != 1)
    
    		min_int = 0;
    
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    	if (ast_strlen_zero(args.max) || sscanf(args.max, "%30d", &max_int) != 1)
    
    		max_int = RAND_MAX;
    
    	if (max_int < min_int) {
    		int tmp = max_int;
    
    		max_int = min_int;
    		min_int = tmp;
    
    	}
    
    	response_int = min_int + (ast_random() % (max_int - min_int + 1));
    
    	ast_debug(1, "%d was the lucky number in range [%d,%d]\n", response_int, min_int, max_int);
    
    	snprintf(buffer, buflen, "%d", response_int);
    
    
    	return 0;
    
    static struct ast_custom_function acf_rand = {
    
    	.name = "RAND",
    	.read = acf_rand_exec,
    
    	.read_max = 12,
    
    static int unload_module(void)
    
    {
    	ast_custom_function_unregister(&acf_rand);
    
    	return 0;
    }
    
    
    static int load_module(void)
    
    {
    	return ast_custom_function_register(&acf_rand);
    }
    
    
    AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Random number dialplan function");