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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Runtime/common/path/comparepaths.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/path/comparepaths.cpp b/src/VBox/Runtime/common/path/comparepaths.cpp new file mode 100644 index 00000000..79ac2edd --- /dev/null +++ b/src/VBox/Runtime/common/path/comparepaths.cpp @@ -0,0 +1,178 @@ +/* $Id: comparepaths.cpp $ */ +/** @file + * IPRT - Path Comparison. + */ + +/* + * 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/errcore.h> +#include <iprt/string.h> +#include <iprt/uni.h> + + +/** + * Helper for RTPathCompare() and RTPathStartsWith(). + * + * @returns similar to strcmp. + * @param pszPath1 Path to compare. + * @param pszPath2 Path to compare. + * @param fLimit Limit the comparison to the length of \a pszPath2 + * @internal + */ +static int rtPathCompare(const char *pszPath1, const char *pszPath2, bool fLimit) +{ + if (pszPath1 == pszPath2) + return 0; + if (!pszPath1) + return -1; + if (!pszPath2) + return 1; + +#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2) + for (;;) + { + RTUNICP uc1; + int rc = RTStrGetCpEx(&pszPath1, &uc1); + if (RT_SUCCESS(rc)) + { + RTUNICP uc2; + rc = RTStrGetCpEx(&pszPath2, &uc2); + if (RT_SUCCESS(rc)) + { + if (uc1 == uc2) + { + if (uc1) + { /* likely */ } + else + return 0; + } + else + { + if (uc1 == '\\') + uc1 = '/'; + else + uc1 = RTUniCpToUpper(uc1); + if (uc2 == '\\') + uc2 = '/'; + else + uc2 = RTUniCpToUpper(uc2); + if (uc1 != uc2) + { + if (fLimit && uc2 == '\0') + return 0; + return uc1 > uc2 ? 1 : -1; /* (overflow/underflow paranoia) */ + } + } + } + else + return 1; + } + else + return -1; + } +#else + if (!fLimit) + return strcmp(pszPath1, pszPath2); + return strncmp(pszPath1, pszPath2, strlen(pszPath2)); +#endif +} + + +/** + * Compares two paths. + * + * The comparison takes platform-dependent details into account, + * such as: + * <ul> + * <li>On DOS-like platforms, both separator chars (|\| and |/|) are considered + * to be equal. + * <li>On platforms with case-insensitive file systems, mismatching characters + * are uppercased and compared again. + * </ul> + * + * @returns @< 0 if the first path less than the second path. + * @returns 0 if the first path identical to the second path. + * @returns @> 0 if the first path greater than the second path. + * + * @param pszPath1 Path to compare (must be an absolute path). + * @param pszPath2 Path to compare (must be an absolute path). + * + * @remarks File system details are currently ignored. This means that you won't + * get case-insensitive compares on unix systems when a path goes into a + * case-insensitive filesystem like FAT, HPFS, HFS, NTFS, JFS, or + * similar. For NT, OS/2 and similar you'll won't get case-sensitive + * compares on a case-sensitive file system. + */ +RTDECL(int) RTPathCompare(const char *pszPath1, const char *pszPath2) +{ + return rtPathCompare(pszPath1, pszPath2, false /* full path lengths */); +} + + +/** + * Checks if a path starts with the given parent path. + * + * This means that either the path and the parent path matches completely, or + * that the path is to some file or directory residing in the tree given by the + * parent directory. + * + * The path comparison takes platform-dependent details into account, + * see RTPathCompare() for details. + * + * @returns |true| when \a pszPath starts with \a pszParentPath (or when they + * are identical), or |false| otherwise. + * + * @param pszPath Path to check, must be an absolute path. + * @param pszParentPath Parent path, must be an absolute path. + * No trailing directory slash! + */ +RTDECL(bool) RTPathStartsWith(const char *pszPath, const char *pszParentPath) +{ + if (pszPath == pszParentPath) + return true; + if (!pszPath || !pszParentPath) + return false; + + if (rtPathCompare(pszPath, pszParentPath, true /* limited by path 2 */) != 0) + return false; + + const size_t cchParentPath = strlen(pszParentPath); + if (RTPATH_IS_SLASH(pszPath[cchParentPath])) + return true; + if (pszPath[cchParentPath] == '\0') + return true; + + /* Deal with pszParentPath = root (or having a trailing slash). */ + if ( cchParentPath > 0 + && RTPATH_IS_SLASH(pszParentPath[cchParentPath - 1]) + && RTPATH_IS_SLASH(pszPath[cchParentPath - 1])) + return true; + + return false; +} + |