1 | /* $Id: simplepattern.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - RTStrSimplePattern.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2019 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 <iprt/string.h>
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32 | #include "internal/iprt.h"
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33 |
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34 | #include <iprt/assert.h>
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35 |
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36 |
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37 | RTDECL(bool) RTStrSimplePatternMatch(const char *pszPattern, const char *pszString)
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38 | {
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39 | #if 0
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40 | return RTStrSimplePatternNMatch(pszPattern, RTSTR_MAX, pszString, RTSTR_MAX);
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41 | #else
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42 | /* ASSUMES ASCII / UTF-8 */
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43 | for (;;)
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44 | {
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45 | char chPat = *pszPattern;
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46 | switch (chPat)
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47 | {
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48 | default:
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49 | if (*pszString != chPat)
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50 | return false;
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51 | break;
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52 |
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53 | case '*':
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54 | {
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55 | /* collapse '*' and '?', they are superfluous */
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56 | while ((chPat = *++pszPattern) == '*' || chPat == '?')
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57 | /* nothing */;
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58 |
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59 | /* if no more pattern, we're done now. */
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60 | if (!chPat)
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61 | return true;
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62 |
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63 | /* find chPat in the string and try get a match on the remaining pattern. */
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64 | for (;;)
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65 | {
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66 | char chStr = *pszString++;
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67 | if ( chStr == chPat
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68 | && RTStrSimplePatternMatch(pszPattern + 1, pszString))
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69 | return true;
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70 | if (!chStr)
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71 | return false;
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72 | }
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73 | /* won't ever get here */
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74 | break;
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75 | }
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76 |
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77 | case '?':
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78 | if (!*pszString)
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79 | return false;
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80 | break;
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81 |
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82 | case '\0':
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83 | return !*pszString;
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84 | }
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85 | pszString++;
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86 | pszPattern++;
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87 | }
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88 | #endif
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89 | }
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90 | RT_EXPORT_SYMBOL(RTStrSimplePatternMatch);
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91 |
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92 |
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93 | RTDECL(bool) RTStrSimplePatternNMatch(const char *pszPattern, size_t cchPattern,
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94 | const char *pszString, size_t cchString)
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95 | {
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96 | /* ASSUMES ASCII / UTF-8 */
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97 | for (;;)
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98 | {
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99 | char chPat = cchPattern ? *pszPattern : '\0';
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100 | switch (chPat)
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101 | {
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102 | default:
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103 | {
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104 | char chStr = cchString ? *pszString : '\0';
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105 | if (chStr != chPat)
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106 | return false;
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107 | break;
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108 | }
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109 |
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110 | case '*':
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111 | {
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112 | /* Collapse '*' and '?', they are superfluous. End of the pattern == match. */
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113 | do
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114 | {
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115 | if (!--cchPattern)
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116 | return true;
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117 | chPat = *++pszPattern;
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118 | } while (chPat == '*' || chPat == '?');
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119 | if (!chPat)
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120 | return true;
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121 |
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122 | /* Find chPat in the string and try get a match on the remaining pattern. */
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123 | for (;;)
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124 | {
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125 | if (!cchString--)
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126 | return false;
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127 | char chStr = *pszString++;
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128 | if ( chStr == chPat
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129 | && RTStrSimplePatternNMatch(pszPattern + 1, cchPattern - 1, pszString, cchString))
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130 | return true;
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131 | if (!chStr)
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132 | return false;
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133 | }
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134 | /* won't ever get here */
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135 | break;
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136 | }
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137 |
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138 | case '?':
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139 | if (!cchString || !*pszString)
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140 | return false;
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141 | break;
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142 |
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143 | case '\0':
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144 | return cchString == 0 || !*pszString;
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145 | }
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146 |
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147 | /* advance */
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148 | pszString++;
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149 | cchString--;
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150 | pszPattern++;
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151 | cchPattern--;
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152 | }
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153 | }
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154 | RT_EXPORT_SYMBOL(RTStrSimplePatternNMatch);
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155 |
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156 |
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157 | RTDECL(bool) RTStrSimplePatternMultiMatch(const char *pszPatterns, size_t cchPatterns,
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158 | const char *pszString, size_t cchString,
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159 | size_t *poffMatchingPattern)
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160 | {
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161 | const char *pszCur = pszPatterns;
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162 | while (*pszCur && cchPatterns)
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163 | {
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164 | /*
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165 | * Find the end of the current pattern.
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166 | */
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167 | unsigned char ch = '\0';
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168 | const char *pszEnd = pszCur;
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169 | while (cchPatterns && (ch = *pszEnd) != '\0' && ch != '|')
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170 | cchPatterns--, pszEnd++;
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171 |
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172 | /*
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173 | * Try match it.
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174 | */
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175 | if (RTStrSimplePatternNMatch(pszCur, pszEnd - pszCur, pszString, cchString))
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176 | {
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177 | if (poffMatchingPattern)
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178 | *poffMatchingPattern = pszCur - pszPatterns;
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179 | return true;
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180 | }
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181 |
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182 | /* advance */
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183 | if (!ch || !cchPatterns)
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184 | break;
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185 | cchPatterns--;
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186 | pszCur = pszEnd + 1;
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187 | }
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188 |
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189 | if (poffMatchingPattern)
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190 | *poffMatchingPattern = RTSTR_MAX;
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191 | return false;
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192 | }
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193 | RT_EXPORT_SYMBOL(RTStrSimplePatternMultiMatch);
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194 |
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