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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2007, Digium, Inc.
*
* Modified from func_devstate.c by Russell Bryant <russell@digium.com>
* Adam Gundy <adam@starsilk.net>
* 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 Get the state of a hinted extension for dialplan control
*
* \author Adam Gundy <adam@starsilk.net>
*
* \ingroup functions
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 328259 $")
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/utils.h"
#include "asterisk/devicestate.h"
/*** DOCUMENTATION
<function name="EXTENSION_STATE" language="en_US">
<synopsis>
Get an extension's state.
</synopsis>
<syntax argsep="@">
<parameter name="extension" required="true" />
<parameter name="context">
<para>If it is not specified defaults to <literal>default</literal>.</para>
</parameter>
</syntax>
<description>
<para>The EXTENSION_STATE function can be used to retrieve the state from any
hinted extension. For example:</para>
<para>NoOp(1234@default has state ${EXTENSION_STATE(1234)})</para>
<para>NoOp(4567@home has state ${EXTENSION_STATE(4567@home)})</para>
<para>The possible values returned by this function are:</para>
<para>UNKNOWN | NOT_INUSE | INUSE | BUSY | INVALID | UNAVAILABLE | RINGING |
RINGINUSE | HOLDINUSE | ONHOLD</para>
</description>
</function>
***/
static const char *ast_extstate_str(int state)
{
const char *res = "UNKNOWN";
switch (state) {
case AST_EXTENSION_NOT_INUSE:
res = "NOT_INUSE";
break;
case AST_EXTENSION_INUSE:
res = "INUSE";
break;
case AST_EXTENSION_BUSY:
res = "BUSY";
break;
case AST_EXTENSION_UNAVAILABLE:
res = "UNAVAILABLE";
break;
case AST_EXTENSION_RINGING:
res = "RINGING";
break;
case AST_EXTENSION_INUSE | AST_EXTENSION_RINGING:
res = "RINGINUSE";
break;
case AST_EXTENSION_INUSE | AST_EXTENSION_ONHOLD:
res = "HOLDINUSE";
break;
case AST_EXTENSION_ONHOLD:
res = "ONHOLD";
break;
}
return res;
}
static int extstate_read(struct ast_channel *chan, const char *cmd, char *data,
char *buf, size_t len)
{
char *exten, *context;
if (ast_strlen_zero(data)) {
ast_log(LOG_WARNING, "EXTENSION_STATE requires an extension\n");
return -1;
}
context = exten = data;
strsep(&context, "@");
if (ast_strlen_zero(context))
context = "default";
if (ast_strlen_zero(exten)) {
ast_log(LOG_WARNING, "EXTENSION_STATE requires an extension\n");
return -1;
}
ast_copy_string(buf,
ast_extstate_str(ast_extension_state(chan, context, exten)), len);
return 0;
}
static struct ast_custom_function extstate_function = {
.name = "EXTENSION_STATE",
.read = extstate_read,
.read_max = 12,
};
static int unload_module(void)
{
int res;
res = ast_custom_function_unregister(&extstate_function);
return res;
}
static int load_module(void)
{
int res;
res = ast_custom_function_register(&extstate_function);
return res ? AST_MODULE_LOAD_DECLINE : AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Gets an extension's state in the dialplan");
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