a866a75900
This branch adds additional methods to dialplan functions, whereby the result buffers are now dynamic buffers, which can be expanded to the size of any result. No longer are variable substitutions limited to 4095 bytes of data. In addition, the common case of needing buffers much smaller than that will enable substitution to only take up the amount of memory actually needed. The existing variable substitution routines are still available, but users of those API calls should transition to using the dynamic-buffer APIs. Reviewboard: http://reviewboard.digium.com/r/174/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@191140 65c4cc65-6c06-0410-ace0-fbb531ad65f3
106 lines
2.7 KiB
C
106 lines
2.7 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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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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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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<para>Example: Set(junky=${RAND(1,8)});
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Sets junky to a random number between 1 and 8, inclusive.</para>
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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, "%d", &min_int) != 1)
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min_int = 0;
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if (ast_strlen_zero(args.max) || sscanf(args.max, "%d", &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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