/* $Id: RTPathAbsDup.cpp 78048 2019-04-09 01:21:09Z vboxsync $ */
/** @file
 * IPRT - RTPathAbsDup
 */

/*
 * Copyright (C) 2006-2019 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
 * VirtualBox OSE 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.
 */


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

#include <iprt/err.h>
#include <iprt/param.h>
#include <iprt/string.h>


/**
 * Same as RTPathAbs only the result is RTStrDup()'ed.
 *
 * @returns Pointer to real path. Use RTStrFree() to free this string.
 * @returns NULL if RTPathAbs() or RTStrDup() fails.
 * @param   pszPath         The path to resolve.
 */
RTDECL(char *) RTPathAbsDup(const char *pszPath)
{
    /* Try with a static buffer first. */
    char szPath[RTPATH_MAX];
    int rc = RTPathAbs(pszPath, szPath, sizeof(szPath));
    if (RT_SUCCESS(rc))
        return RTStrDup(szPath);

    /* If it looks like we ran out of buffer space, double the size until
       we reach 64 KB. */
    if (rc == VERR_FILENAME_TOO_LONG || rc == VERR_BUFFER_OVERFLOW)
    {
        size_t cbBuf = RTPATH_MAX;
        do
        {
            cbBuf *= 2;
            char *pszBuf = RTStrAlloc(cbBuf);
            if (!pszBuf)
                break;
            rc = RTPathAbs(pszPath, pszBuf, cbBuf);
            if (RT_SUCCESS(rc))
                return pszBuf;
            RTStrFree(pszBuf);
        } while (cbBuf <= _32K);
    }
    return NULL;
}