funcs/func_global.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2006, Tilghman Lesher
   5  *
   6  * Tilghman Lesher <func_global__200605@the-tilghman.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Global variable dialplan functions
  22  *
  23  * \author Tilghman Lesher <func_global__200605@the-tilghman.com>
  24  */
  25
  26 #include "asterisk.h"
  27
  28 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35
  36 #include "asterisk/module.h"
  37 #include "asterisk/channel.h"
  38 #include "asterisk/pbx.h"
  39 #include "asterisk/utils.h"
  40
  41 static int global_read(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
  42 {
  43         const char *var = pbx_builtin_getvar_helper(NULL, data);
  44
  45         *buf = '\0';
  46
  47         if (var)
  48                 ast_copy_string(buf, var, len);
  49
  50         return 0;
  51 }
  52
  53 static int global_write(struct ast_channel *chan, char *cmd, char *data, const char *value)
  54 {
  55         pbx_builtin_setvar_helper(NULL, data, value);
  56
  57         return 0;
  58 }
  59
  60 static struct ast_custom_function global_function = {
  61         .name = "GLOBAL",
  62         .synopsis = "Gets or sets the global variable specified",
  63         .syntax = "GLOBAL(<varname>)",
  64         .read = global_read,
  65         .write = global_write,
  66 };
  67
  68 static int unload_module(void)
  69 {
  70         int res = 0;
  71
  72         res |= ast_custom_function_unregister(&global_function);
  73
  74         return res;
  75 }
  76
  77 static int load_module(void)
  78 {
  79         int res = 0;
  80
  81         res |= ast_custom_function_register(&global_function);
  82
  83         return res;
  84 }
  85
  86 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Global variable dialplan functions");