/*

 * Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>

 *

 * This file is part of Open5GS.

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Affero General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>.

 */

#include "core-config-private.h"

#include "ogs-core.h"

char *ogs_strerror(ogs_err_t err, char *buf, size_t size)

{

#if defined(_WIN32)

    /*

     * The following code is stolen from APR Library

     * http://svn.apache.org/repos/asf/apr/apr/trunk/misc/unix/errorcodes.c

     */

    size_t len = 0, i;

    LPTSTR msg = (LPTSTR)buf;

    len = FormatMessage(

            FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,

            NULL,

            err,

            MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), /* Default Language */

            msg,

            (DWORD)(size/sizeof(TCHAR)),

            NULL);

    if (len) {

        /* FormatMessage put the message in the buffer, but it may

         * have embedded a newline (\r\n), and possible more than one.

         * Remove the newlines replacing them with a space. This is not

         * as visually perfect as moving all the remaining message over,

         * but more efficient.

         */

        i = len;

        while (i) {

            i--;

            if ((buf[i] == '\r') || (buf[i] == '\n'))

                buf[i] = ' ';

        }

    }

    else {

        /* Windows didn't provide us with a message.  Even stuff like */

        ogs_snprintf(buf, size, "Unrecognized Win32 error code %d", (int)err);

    }

    return buf;

#elif defined(HAVE_STRERROR_R)

#if defined(STRERROR_R_CHAR_P)

    return strerror_r(err, buf, size);

#else

    int ret = strerror_r(err, buf, size);

    if (ret == 0)

        return buf;

    else

        return NULL;

#endif

#else

#error TODO

#endif

}