Asterisk.org: Developer Documentation (28 Oct 2009)

Wed Oct 28 15:47:54 2009

## Asterisk developer's documentation

# func_env.c

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    00001 /*
    00002  * Asterisk -- An open source telephony toolkit.
    00003  *
    00004  * Copyright (C) 1999 - 2005, Digium, Inc.
    00005  *
    00006  * See http://www.asterisk.org for more information about
    00007  * the Asterisk project. Please do not directly contact
    00008  * any of the maintainers of this project for assistance;
    00009  * the project provides a web site, mailing lists and IRC
    00010  * channels for your use.
    00011  *
    00012  * This program is free software, distributed under the terms of
    00013  * the GNU General Public License Version 2. See the LICENSE file
    00014  * at the top of the source tree.
    00015  */
    00016
    00017 /*! \file
    00018  *
    00019  * \brief Environment related dialplan functions
    00020  *
    00021  */
    00022
    00023 #include <stdlib.h>
    00024 #include <string.h>
    00025 #include <sys/types.h>
    00026
    00027 #include "asterisk.h"
    00028
    00029 /* ASTERISK_FILE_VERSION(__FILE__, "$Revision: 7221 $") */
    00030
    00031 #include "asterisk/channel.h"
    00032 #include "asterisk/pbx.h"
    00033 #include "asterisk/logger.h"
    00034 #include "asterisk/utils.h"
    00035 #include "asterisk/app.h"
    00036
    00037 static char *builtin_function_env_read(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
    00038 {
    00039    char *ret = "";
    00040
    00041    if (data) {
    00042       ret = getenv(data);
    00043       if (!ret)
    00044          ret = "";
    00045    }
    00046    ast_copy_string(buf, ret, len);
    00047
    00048    return buf;
    00049 }
    00050
    00051 static void builtin_function_env_write(struct ast_channel *chan, char *cmd, char *data, const char *value)
    00052 {
    00053    if (!ast_strlen_zero(data)) {
    00054       if (!ast_strlen_zero(value)) {
    00055          setenv(data, value, 1);
    00056       } else {
    00057          unsetenv(data);
    00058       }
    00059    }
    00060 }
    00061
    00062 #ifndef BUILTIN_FUNC
    00063 static
    00064 #endif
    00065 struct ast_custom_function env_function = {
    00066    .name = "ENV",
    00067    .synopsis = "Gets or sets the environment variable specified",
    00068    .syntax = "ENV(<envname>)",
    00069    .read = builtin_function_env_read,
    00070    .write = builtin_function_env_write,
    00071 };