| 1 | /* $Id: comparepaths.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - Path Comparison.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2022 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * The contents of this file may alternatively be used under the terms
|
|---|
| 18 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | *
|
|---|
| 23 | * You may elect to license modified versions of this file under the
|
|---|
| 24 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | */
|
|---|
| 26 |
|
|---|
| 27 |
|
|---|
| 28 | /*********************************************************************************************************************************
|
|---|
| 29 | * Header Files *
|
|---|
| 30 | *********************************************************************************************************************************/
|
|---|
| 31 | #include "internal/iprt.h"
|
|---|
| 32 | #include <iprt/path.h>
|
|---|
| 33 | #include <iprt/errcore.h>
|
|---|
| 34 | #include <iprt/string.h>
|
|---|
| 35 | #include <iprt/uni.h>
|
|---|
| 36 |
|
|---|
| 37 |
|
|---|
| 38 | /**
|
|---|
| 39 | * Helper for RTPathCompare() and RTPathStartsWith().
|
|---|
| 40 | *
|
|---|
| 41 | * @returns similar to strcmp.
|
|---|
| 42 | * @param pszPath1 Path to compare.
|
|---|
| 43 | * @param pszPath2 Path to compare.
|
|---|
| 44 | * @param fLimit Limit the comparison to the length of \a pszPath2
|
|---|
| 45 | * @internal
|
|---|
| 46 | */
|
|---|
| 47 | static int rtPathCompare(const char *pszPath1, const char *pszPath2, bool fLimit)
|
|---|
| 48 | {
|
|---|
| 49 | if (pszPath1 == pszPath2)
|
|---|
| 50 | return 0;
|
|---|
| 51 | if (!pszPath1)
|
|---|
| 52 | return -1;
|
|---|
| 53 | if (!pszPath2)
|
|---|
| 54 | return 1;
|
|---|
| 55 |
|
|---|
| 56 | #if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
|
|---|
| 57 | for (;;)
|
|---|
| 58 | {
|
|---|
| 59 | RTUNICP uc1;
|
|---|
| 60 | int rc = RTStrGetCpEx(&pszPath1, &uc1);
|
|---|
| 61 | if (RT_SUCCESS(rc))
|
|---|
| 62 | {
|
|---|
| 63 | RTUNICP uc2;
|
|---|
| 64 | rc = RTStrGetCpEx(&pszPath2, &uc2);
|
|---|
| 65 | if (RT_SUCCESS(rc))
|
|---|
| 66 | {
|
|---|
| 67 | if (uc1 == uc2)
|
|---|
| 68 | {
|
|---|
| 69 | if (uc1)
|
|---|
| 70 | { /* likely */ }
|
|---|
| 71 | else
|
|---|
| 72 | return 0;
|
|---|
| 73 | }
|
|---|
| 74 | else
|
|---|
| 75 | {
|
|---|
| 76 | if (uc1 == '\\')
|
|---|
| 77 | uc1 = '/';
|
|---|
| 78 | else
|
|---|
| 79 | uc1 = RTUniCpToUpper(uc1);
|
|---|
| 80 | if (uc2 == '\\')
|
|---|
| 81 | uc2 = '/';
|
|---|
| 82 | else
|
|---|
| 83 | uc2 = RTUniCpToUpper(uc2);
|
|---|
| 84 | if (uc1 != uc2)
|
|---|
| 85 | {
|
|---|
| 86 | if (fLimit && uc2 == '\0')
|
|---|
| 87 | return 0;
|
|---|
| 88 | return uc1 > uc2 ? 1 : -1; /* (overflow/underflow paranoia) */
|
|---|
| 89 | }
|
|---|
| 90 | }
|
|---|
| 91 | }
|
|---|
| 92 | else
|
|---|
| 93 | return 1;
|
|---|
| 94 | }
|
|---|
| 95 | else
|
|---|
| 96 | return -1;
|
|---|
| 97 | }
|
|---|
| 98 | #else
|
|---|
| 99 | if (!fLimit)
|
|---|
| 100 | return strcmp(pszPath1, pszPath2);
|
|---|
| 101 | return strncmp(pszPath1, pszPath2, strlen(pszPath2));
|
|---|
| 102 | #endif
|
|---|
| 103 | }
|
|---|
| 104 |
|
|---|
| 105 |
|
|---|
| 106 | /**
|
|---|
| 107 | * Compares two paths.
|
|---|
| 108 | *
|
|---|
| 109 | * The comparison takes platform-dependent details into account,
|
|---|
| 110 | * such as:
|
|---|
| 111 | * <ul>
|
|---|
| 112 | * <li>On DOS-like platforms, both separator chars (|\| and |/|) are considered
|
|---|
| 113 | * to be equal.
|
|---|
| 114 | * <li>On platforms with case-insensitive file systems, mismatching characters
|
|---|
| 115 | * are uppercased and compared again.
|
|---|
| 116 | * </ul>
|
|---|
| 117 | *
|
|---|
| 118 | * @returns @< 0 if the first path less than the second path.
|
|---|
| 119 | * @returns 0 if the first path identical to the second path.
|
|---|
| 120 | * @returns @> 0 if the first path greater than the second path.
|
|---|
| 121 | *
|
|---|
| 122 | * @param pszPath1 Path to compare (must be an absolute path).
|
|---|
| 123 | * @param pszPath2 Path to compare (must be an absolute path).
|
|---|
| 124 | *
|
|---|
| 125 | * @remarks File system details are currently ignored. This means that you won't
|
|---|
| 126 | * get case-insensitive compares on unix systems when a path goes into a
|
|---|
| 127 | * case-insensitive filesystem like FAT, HPFS, HFS, NTFS, JFS, or
|
|---|
| 128 | * similar. For NT, OS/2 and similar you'll won't get case-sensitive
|
|---|
| 129 | * compares on a case-sensitive file system.
|
|---|
| 130 | */
|
|---|
| 131 | RTDECL(int) RTPathCompare(const char *pszPath1, const char *pszPath2)
|
|---|
| 132 | {
|
|---|
| 133 | return rtPathCompare(pszPath1, pszPath2, false /* full path lengths */);
|
|---|
| 134 | }
|
|---|
| 135 |
|
|---|
| 136 |
|
|---|
| 137 | /**
|
|---|
| 138 | * Checks if a path starts with the given parent path.
|
|---|
| 139 | *
|
|---|
| 140 | * This means that either the path and the parent path matches completely, or
|
|---|
| 141 | * that the path is to some file or directory residing in the tree given by the
|
|---|
| 142 | * parent directory.
|
|---|
| 143 | *
|
|---|
| 144 | * The path comparison takes platform-dependent details into account,
|
|---|
| 145 | * see RTPathCompare() for details.
|
|---|
| 146 | *
|
|---|
| 147 | * @returns |true| when \a pszPath starts with \a pszParentPath (or when they
|
|---|
| 148 | * are identical), or |false| otherwise.
|
|---|
| 149 | *
|
|---|
| 150 | * @param pszPath Path to check, must be an absolute path.
|
|---|
| 151 | * @param pszParentPath Parent path, must be an absolute path.
|
|---|
| 152 | * No trailing directory slash!
|
|---|
| 153 | */
|
|---|
| 154 | RTDECL(bool) RTPathStartsWith(const char *pszPath, const char *pszParentPath)
|
|---|
| 155 | {
|
|---|
| 156 | if (pszPath == pszParentPath)
|
|---|
| 157 | return true;
|
|---|
| 158 | if (!pszPath || !pszParentPath)
|
|---|
| 159 | return false;
|
|---|
| 160 |
|
|---|
| 161 | if (rtPathCompare(pszPath, pszParentPath, true /* limited by path 2 */) != 0)
|
|---|
| 162 | return false;
|
|---|
| 163 |
|
|---|
| 164 | const size_t cchParentPath = strlen(pszParentPath);
|
|---|
| 165 | if (RTPATH_IS_SLASH(pszPath[cchParentPath]))
|
|---|
| 166 | return true;
|
|---|
| 167 | if (pszPath[cchParentPath] == '\0')
|
|---|
| 168 | return true;
|
|---|
| 169 |
|
|---|
| 170 | /* Deal with pszParentPath = root (or having a trailing slash). */
|
|---|
| 171 | if ( cchParentPath > 0
|
|---|
| 172 | && RTPATH_IS_SLASH(pszParentPath[cchParentPath - 1])
|
|---|
| 173 | && RTPATH_IS_SLASH(pszPath[cchParentPath - 1]))
|
|---|
| 174 | return true;
|
|---|
| 175 |
|
|---|
| 176 | return false;
|
|---|
| 177 | }
|
|---|
| 178 |
|
|---|
