109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2006, Digium, Inc.
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* Copyright (C) 2006, Claude Patry
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Generate Random Number
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*
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* \author Claude Patry <cpatry@gmail.com>
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* \author Tilghman Lesher ( http://asterisk.drunkcoder.com/ )
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* \ingroup functions
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/module.h"
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/utils.h"
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#include "asterisk/app.h"
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/*** DOCUMENTATION
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<function name="RAND" language="en_US">
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<synopsis>
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Choose a random number in a range.
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</synopsis>
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<syntax>
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<parameter name="min" />
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<parameter name="max" />
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</syntax>
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<description>
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<para>Choose a random number between <replaceable>min</replaceable> and <replaceable>max</replaceable>.
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<replaceable>min</replaceable> defaults to <literal>0</literal>, if not specified, while <replaceable>max</replaceable> defaults
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to <literal>RAND_MAX</literal> (2147483647 on many systems).</para>
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<example title="Set random number between 1 and 8, inclusive">
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exten => s,1,Set(junky=${RAND(1,8)})
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</example>
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</description>
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</function>
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***/
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static int acf_rand_exec(struct ast_channel *chan, const char *cmd,
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char *parse, char *buffer, size_t buflen)
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{
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int min_int, response_int, max_int;
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AST_DECLARE_APP_ARGS(args,
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AST_APP_ARG(min);
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AST_APP_ARG(max);
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);
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AST_STANDARD_APP_ARGS(args, parse);
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if (ast_strlen_zero(args.min) || sscanf(args.min, "%30d", &min_int) != 1)
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min_int = 0;
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if (ast_strlen_zero(args.max) || sscanf(args.max, "%30d", &max_int) != 1)
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max_int = RAND_MAX;
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if (max_int < min_int) {
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int tmp = max_int;
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max_int = min_int;
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min_int = tmp;
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ast_debug(1, "max<min\n");
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}
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response_int = min_int + (ast_random() % (max_int - min_int + 1));
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ast_debug(1, "%d was the lucky number in range [%d,%d]\n", response_int, min_int, max_int);
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snprintf(buffer, buflen, "%d", response_int);
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return 0;
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}
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static struct ast_custom_function acf_rand = {
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.name = "RAND",
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.read = acf_rand_exec,
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.read_max = 12,
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};
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static int unload_module(void)
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{
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ast_custom_function_unregister(&acf_rand);
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return 0;
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}
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static int load_module(void)
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{
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return ast_custom_function_register(&acf_rand);
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Random number dialplan function");
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