/* $Id: rtPathVolumeSpecLen.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
/** @file
 * IPRT - rtPathVolumeSpecLen
 */

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



/**
 * Returns the length of the volume name specifier of the given path.
 * If no such specifier zero is returned.
 */
DECLHIDDEN(size_t) rtPathVolumeSpecLen(const char *pszPath)
{
#if defined (RT_OS_OS2) || defined (RT_OS_WINDOWS)
    if (pszPath && *pszPath)
    {
        /* UNC path. */
        /** @todo r=bird: it's UNC and we have to check that the next char isn't a
         *        slash, then skip both the server and the share name. */
        if (    (pszPath[0] == '\\' || pszPath[0] == '/')
            &&  (pszPath[1] == '\\' || pszPath[1] == '/'))
            return strcspn(pszPath + 2, "\\/") + 2;

        /* Drive letter. */
        if (    pszPath[1] == ':'
            &&  RT_C_IS_ALPHA(pszPath[0]))
            return 2;
    }
    return 0;

#else
    /* This isn't quite right when looking at the above stuff, but it works assuming that '//' does not mean UNC. */
    /// @todo (dmik) well, it's better to consider there's no volume name
    //  at all on *nix systems
    NOREF(pszPath);
    return 0;
//    return pszPath && pszPath[0] == '/';
#endif
}