| 1 | /* $Id: RTPathParseSimple.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - RTPathParseSimple
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "internal/iprt.h"
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| 32 | #include <iprt/path.h>
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| 33 |
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| 34 | #include <iprt/assert.h>
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| 35 | #include <iprt/ctype.h>
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| 36 |
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| 37 |
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| 38 | /**
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| 39 | * Parses a path.
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| 40 | *
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| 41 | * It figures the length of the directory component, the offset of
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| 42 | * the file name and the location of the suffix dot.
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| 43 | *
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| 44 | * @returns The path length.
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| 45 | *
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| 46 | * @param pszPath Path to find filename in.
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| 47 | * @param pcchDir Where to put the length of the directory component. If
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| 48 | * no directory, this will be 0. Optional.
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| 49 | * @param poffName Where to store the filename offset.
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| 50 | * If empty string or if it's ending with a slash this
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| 51 | * will be set to -1. Optional.
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| 52 | * @param poffSuff Where to store the suffix offset (the last dot).
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| 53 | * If empty string or if it's ending with a slash this
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| 54 | * will be set to -1. Optional.
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| 55 | */
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| 56 | RTDECL(size_t) RTPathParseSimple(const char *pszPath, size_t *pcchDir, ssize_t *poffName, ssize_t *poffSuff)
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| 57 | {
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| 58 | /*
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| 59 | * First deal with the root as it is always more fun that you'd think.
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| 60 | */
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| 61 | const char *psz = pszPath;
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| 62 | size_t cchRoot = 0;
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| 63 |
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| 64 | #if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
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| 65 | if (RT_C_IS_ALPHA(*psz) && RTPATH_IS_VOLSEP(psz[1]))
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| 66 | {
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| 67 | /* Volume specifier. */
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| 68 | cchRoot = 2;
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| 69 | psz += 2;
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| 70 | }
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| 71 | else if (RTPATH_IS_SLASH(*psz) && RTPATH_IS_SLASH(psz[1]))
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| 72 | {
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| 73 | /* UNC - there are exactly two prefix slashes followed by a namespace
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| 74 | or computer name, which can be empty on windows. */
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| 75 | cchRoot = 2;
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| 76 | psz += 2;
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| 77 | while (!RTPATH_IS_SLASH(*psz) && *psz)
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| 78 | {
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| 79 | cchRoot++;
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| 80 | psz++;
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| 81 | }
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| 82 | }
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| 83 | #endif
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| 84 | while (RTPATH_IS_SLASH(*psz))
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| 85 | {
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| 86 | cchRoot++;
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| 87 | psz++;
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| 88 | }
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| 89 |
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| 90 | /*
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| 91 | * Do the remainder.
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| 92 | */
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| 93 | const char *pszName = psz;
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| 94 | const char *pszLastDot = NULL;
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| 95 | for (;; psz++)
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| 96 | {
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| 97 | switch (*psz)
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| 98 | {
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| 99 | default:
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| 100 | break;
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| 101 |
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| 102 | /* handle separators. */
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| 103 | #if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
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| 104 | case '\\':
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| 105 | #endif
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| 106 | case '/':
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| 107 | pszName = psz + 1;
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| 108 | pszLastDot = NULL;
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| 109 | break;
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| 110 |
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| 111 | case '.':
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| 112 | pszLastDot = psz;
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| 113 | break;
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| 114 |
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| 115 | /*
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| 116 | * The end. Complete the results.
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| 117 | */
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| 118 | case '\0':
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| 119 | {
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| 120 | ssize_t offName = *pszName != '\0' ? pszName - pszPath : -1;
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| 121 | if (poffName)
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| 122 | *poffName = offName;
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| 123 |
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| 124 | if (poffSuff)
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| 125 | {
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| 126 | ssize_t offSuff = -1;
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| 127 | if ( pszLastDot
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| 128 | && pszLastDot != pszName
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| 129 | && pszLastDot[1] != '\0')
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| 130 | {
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| 131 | offSuff = pszLastDot - pszPath;
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| 132 | Assert(offSuff > offName);
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| 133 | }
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| 134 | *poffSuff = offSuff;
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| 135 | }
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| 136 |
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| 137 | if (pcchDir)
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| 138 | {
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| 139 | size_t cch = offName < 0 ? psz - pszPath : offName - 1 < (ssize_t)cchRoot ? cchRoot : offName - 1;
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| 140 | while (cch > cchRoot && RTPATH_IS_SLASH(pszPath[cch - 1]))
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| 141 | cch--;
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| 142 | *pcchDir = cch;
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| 143 | }
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| 144 |
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| 145 | return psz - pszPath;
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| 146 | }
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| 147 | }
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| 148 | }
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| 149 |
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| 150 | /* will never get here */
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| 151 | }
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| 152 |
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