func_extstate.c

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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"
 
#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">
        <since>
            <version>1.6.0</version>
        </since>
        <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");