RTPathAppend.cpp revision b6cc4092c1e80655a5bc19dc125e772a8d2b870d
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * IPRT - RTPathAppend
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * Copyright (C) 2009 Sun Microsystems, Inc.
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * available from http://www.virtualbox.org. This file is free software;
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * you can redistribute it and/or modify it under the terms of the GNU
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * General Public License (GPL) as published by the Free Software
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * The contents of this file may alternatively be used under the terms
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * of the Common Development and Distribution License Version 1.0
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fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * VirtualBox OSE distribution, in which case the provisions of the
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * CDDL are applicable instead of those of the GPL.
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fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * additional information or have any questions.
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync/*******************************************************************************
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync* Header Files *
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync*******************************************************************************/
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * Figures the length of the root part of the path.
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * @returns length of the root specifier.
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * @retval 0 if none.
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * @param pszPath The path to investigate.
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * @remarks Unnecessary root slashes will not be counted. The caller will have
b6cc4092c1e80655a5bc19dc125e772a8d2b870dvboxsync * to deal with it where it matters. (Unlike rtPathRootSpecLen which
b6cc4092c1e80655a5bc19dc125e772a8d2b870dvboxsync * counts them.)
b6cc4092c1e80655a5bc19dc125e772a8d2b870dvboxsyncstatic size_t rtPathRootSpecLen2(const char *pszPath)
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync /* fend of wildlife. */
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync /* Root slash? */
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync /* Find the end of the server name. */
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync /* Find the end of the share name */
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync /* Drive specifier? */
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsyncRTDECL(int) RTPathAppend(char *pszPath, size_t cbPathDst, const char *pszAppend)
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync char *pszPathEnd = (char *)memchr(pszPath, '\0', cbPathDst);
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * Special cases.
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * Balance slashes and check for buffer overflow.
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync bool fAddSlash = false;
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync if ((size_t)(pszPathEnd - pszPath) + cchAppend >= cbPathDst)
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync if ((size_t)(pszPathEnd - pszPath) + 1 + cchAppend >= cbPathDst)
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync /* One slash is sufficient at this point. */
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync if ((size_t)(pszPathEnd - pszPath) + cchAppend >= cbPathDst)
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync /* No slashes needed in the appended bit. */
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync /* In the leading path we can skip unnecessary trailing slashes, but
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync be sure to leave one. */
b6cc4092c1e80655a5bc19dc125e772a8d2b870dvboxsync size_t const cchRoot = rtPathRootSpecLen2(pszPath);
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync while ( (size_t)(pszPathEnd - pszPath) > RT_MAX(1, cchRoot)
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync if ((size_t)(pszPathEnd - pszPath) + cchAppend >= cbPathDst)
fe02cc356f7bd01a7ffbcd6ceb8ca09bb1c35330vboxsync * What remains now is the just the copying.