/* $Id: RTPathStripFilename.cpp $ */
/** @file
 * IPRT - RTPathStripFilename
 */

/*
 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
 *
 * This file is part of VirtualBox base platform packages, as
 * available from https://www.virtualbox.org.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation, in version 3 of the
 * License.
 *
 * 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>.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
 * in the VirtualBox distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 *
 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
 */


/*********************************************************************************************************************************
*   Header Files                                                                                                                 *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/path.h>
#include <iprt/ctype.h>


/**
 * Strips the filename from a path. Truncates the given string in-place by overwriting the
 * last path separator character with a null byte in a platform-neutral way.
 *
 * @param   pszPath     Path from which filename should be extracted, will be truncated.
 *                      If the string contains no path separator, it will be changed to a "." string.
 */
RTDECL(void) RTPathStripFilename(char *pszPath)
{
    char *psz = pszPath;
    char *pszLastSep = NULL;


    for (;; psz++)
    {
        switch (*psz)
        {
            /* handle separators. */
#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
            case ':':
                pszLastSep = psz + 1;
                if (RTPATH_IS_SLASH(psz[1]))
                    pszPath = psz + 1;
                else
                    pszPath = psz;
                break;

            case '\\':
#endif
            case '/':
                pszLastSep = psz;
                break;

            /* the end */
            case '\0':
                if (!pszLastSep)
                {
                    /* no directory component */
                    pszPath[0] = '.';
                    pszPath[1] = '\0';
                }
                else if (pszLastSep == pszPath)
                {
                    /* only root. */
                    pszLastSep[1] = '\0';
                }
                else
                    pszLastSep[0] = '\0';
                return;
        }
    }
    /* will never get here */
}