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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/ )
* \ingroup functions
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/module.h"
#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>
<para>Example: Set(junky=${RAND(1,8)});
Sets junky to a random number between 1 and 8, inclusive.</para>
</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);
if (ast_strlen_zero(args.min) || sscanf(args.min, "%30d", &min_int) != 1)
min_int = 0;
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;
ast_debug(1, "max<min\n");
}
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");
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