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Diffstat (limited to 'src/VBox/Runtime/common/path/RTPathFindCommon.cpp.h')
| -rw-r--r-- | src/VBox/Runtime/common/path/RTPathFindCommon.cpp.h | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/path/RTPathFindCommon.cpp.h b/src/VBox/Runtime/common/path/RTPathFindCommon.cpp.h new file mode 100644 index 00000000..196a26a0 --- /dev/null +++ b/src/VBox/Runtime/common/path/RTPathFindCommon.cpp.h @@ -0,0 +1,267 @@ +/* $Id: RTPathFindCommon.cpp.h $ */ +/** @file + * IPRT - RTPathFindCommon - Code Template. + * + * This file included multiple times with different path style macros. + */ + +/* + * Copyright (C) 2020-2023 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 + */ + +#include "rtpath-root-length-template.cpp.h" + + +/** Helper for skipping slashes, given a pointer to the first one. */ +DECLINLINE(const char *) RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(const char *pszSlash) +{ + for (;;) + { + char ch; + do + ch = *++pszSlash; + while (RTPATH_IS_SLASH(ch)); + + /* Also skip '/./' sequences. */ + if ( ch != '.' + || !RTPATH_IS_SLASH(pszSlash[1])) + break; + pszSlash++; + } + return pszSlash; +} + + +static size_t RTPATH_STYLE_FN(rtPathFindCommon)(size_t cPaths, const char **papszPaths, uint32_t fFlags) +{ + /* + * Check for '..' elements before we start doing anything. + * + * They are currently not supported at all (lazy) and we shun them for + * security reasons. Iff we want to support them properly, we'd have to: + * 1. Note down exactly where the root specification ends for each of + * the paths so we can prevent '..' from messing with it. + * 2. When encountering '..', we'd have to ascend all paths. + * 3. When encountering a difference, we'd have to see if it's eliminated + * by a following '..' sequence. + * 4. When returning anything, we'd have to see if it could be affected by + * a '..' sequence later in any of the paths. + * + * We could kind of RTAbsPath the secondary paths, however it wouldn't work + * for the primary path we use as reference. + * + * Summa summarum: Annoyingly tedious, so just forget it. + */ + if (!(fFlags & RTPATHFINDCOMMON_F_IGNORE_DOTDOT)) + for (size_t i = 0; i < cPaths; i++) + { + const char * const psz = papszPaths[i]; + const char *pszDot = strchr(psz, '.'); + while (pszDot) + { + if ( pszDot[1] == '.' + && (RTPATH_IS_SLASH(pszDot[2]) || pszDot[2] == '\0') + && ( pszDot == psz + || RTPATH_IS_SLASH(pszDot[-1]) +#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS + || (pszDot[-1] == ':' && psz + 2 == pszDot && !(fFlags & RTPATH_STR_F_NO_START)) +#endif + ) + ) + return 0; + pszDot = strchr(pszDot + 1, '.'); + } + } + + /* + * We use the first path as the reference for the return length. + */ + const char * pszPath0 = papszPaths[0]; + const char * pszPath0EndLastComp = pszPath0; + const char * const pszPath0Start = pszPath0; + + /* + * Deal with root stuff as appropriate. + */ + if (fFlags & RTPATH_STR_F_NO_START) + { + /* We ignore leading slashes when RTPATH_STR_F_NO_START is specified: */ + for (size_t i = 0; i < cPaths; i++) + { + const char *psz = papszPaths[i]; + papszPaths[i] = RTPATH_IS_SLASH(*psz) ? RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(psz) : psz; + } + pszPath0EndLastComp = pszPath0 = papszPaths[0]; + } +#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS + else if (RTPATH_IS_SLASH(pszPath0[0])) + { + /* UNC requires a little bit of special magic to make sure we have + exactly two slashes in each path and don't mix things up. */ + char ch; + if ( RTPATH_IS_SLASH(pszPath0[1]) + && (ch = pszPath0[2]) != '\0' + && !RTPATH_IS_SLASH(ch)) + { + pszPath0 += 2; + for (size_t i = 1; i < cPaths; i++) + { + const char *psz = papszPaths[i]; + if ( RTPATH_IS_SLASH(psz[0]) + && RTPATH_IS_SLASH(psz[1]) + && (ch = psz[2]) != '\0' + && !RTPATH_IS_SLASH(ch)) + papszPaths[i] = psz + 2; + else + return 0; + } + } + else + { + for (size_t i = 1; i < cPaths; i++) + { + const char *psz = papszPaths[i]; + if ( RTPATH_IS_SLASH(psz[0]) + && RTPATH_IS_SLASH(psz[1]) + && (ch = psz[2]) != '\0' + && !RTPATH_IS_SLASH(ch)) + return 0; + if (!RTPATH_IS_SLASH(psz[0])) + return 0; + papszPaths[i] = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(psz); + } + pszPath0EndLastComp = pszPath0 = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(pszPath0); + } + } + /* Skip past the drive letter if there is one, as that eliminates the need + to handle ':' in the main loop below. */ + else if ( RT_C_IS_ALPHA(pszPath0[0]) + && pszPath0[1] == ':') + { + /* Drive letter part first: */ + char const chDrv = RT_C_TO_UPPER(pszPath0[0]); + pszPath0 += 2; + pszPath0EndLastComp = pszPath0; + + for (size_t i = 1; i < cPaths; i++) + { + const char *psz = papszPaths[i]; + if ( ( psz[0] != chDrv + && RT_C_TO_UPPER(psz[0]) != chDrv) + || psz[1] != ':') + return 0; + papszPaths[i] = psz + 2; + } + + /* Subsequent slashes or lack thereof. */ + if (RTPATH_IS_SLASH(*pszPath0)) + { + for (size_t i = 1; i < cPaths; i++) + { + const char *psz = papszPaths[i]; + if (!RTPATH_IS_SLASH(*psz)) + return pszPath0EndLastComp - pszPath0Start; + papszPaths[i] = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(psz); + } + pszPath0EndLastComp = pszPath0 = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(pszPath0); + } + else + for (size_t i = 1; i < cPaths; i++) + if (RTPATH_IS_SLASH(*papszPaths[i])) + return pszPath0EndLastComp - pszPath0Start; + } +#endif + + /* + * Main compare loop. + */ + for (;;) + { + RTUNICP uc0; + int rc = RTStrGetCpEx(&pszPath0, &uc0); + AssertRCReturn(rc, 0); + if (!RTPATH_IS_SLASH(uc0)) + { + if (uc0 != 0) + { + for (size_t i = 1; i < cPaths; i++) + { + RTUNICP uc; + rc = RTStrGetCpEx(&papszPaths[i], &uc); + AssertRCReturn(rc, 0); + if (uc == uc0) + { /* likely */} +#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS + else if ( RTUniCpToUpper(uc) == RTUniCpToUpper(uc0) + || RTUniCpToLower(uc) == RTUniCpToLower(uc0)) + { /* less likely */} +#endif + else + return pszPath0EndLastComp - pszPath0Start; + } + } + else + { + /* pszPath0 is at an end. Check the state of the others as we must + return the whole pszPath0 length if their are also at the end of + at a slash. */ + for (size_t i = 1; i < cPaths; i++) + { + char ch = *papszPaths[i]; + if ( ch != '\0' + && !RTPATH_IS_SLASH(ch)) + return pszPath0EndLastComp - pszPath0Start; + } + return pszPath0 - 1 - pszPath0Start; + } + } + else + { + /* pszPath0 is at a slash. Check whether all the other are too or are at + the end of the string. If any other string ends here, we can return + the length up to but not including the slash. */ + bool fDone = false; + for (size_t i = 1; i < cPaths; i++) + { + char ch = *papszPaths[i]; + if (ch == '\0') + fDone = true; + else if (RTPATH_IS_SLASH(ch)) + papszPaths[i] = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(papszPaths[i]); + else + return pszPath0EndLastComp - pszPath0Start; + } + if (fDone) + return pszPath0 - pszPath0Start; + pszPath0EndLastComp = pszPath0 = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(pszPath0 - 1); + } + } +} + |