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annotate lib/exclude.c @ 5159:a535859efd14

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Merge from coreutils.
author Paul Eggert <eggert@cs.ucla.edu>
date Sat, 07 Aug 2004 00:09:38 +0000
parents 559c5f9c9e45
children 7c24a825b51d
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1 /* exclude.c -- exclude file names
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2
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3 Copyright (C) 1992, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003,
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4 2004 Free Software Foundation, Inc.
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; see the file COPYING.
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18 If not, write to the Free Software Foundation,
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19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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20
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21 /* Written by Paul Eggert <eggert@twinsun.com> */
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22
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23 #if HAVE_CONFIG_H
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24 # include <config.h>
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25 #endif
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26
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27 #include <stdbool.h>
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28
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29 #include <ctype.h>
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30 #include <errno.h>
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31 #include <stddef.h>
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32 #include <stdio.h>
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33 #include <stdlib.h>
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34 #include <string.h>
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35
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36 #include "exclude.h"
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37 #include "fnmatch.h"
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38 #include "unlocked-io.h"
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39 #include "xalloc.h"
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40
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41 #if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII)
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42 # define IN_CTYPE_DOMAIN(c) true
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43 #else
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44 # define IN_CTYPE_DOMAIN(c) isascii (c)
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45 #endif
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46
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47 static inline bool
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48 is_space (unsigned char c)
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49 {
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50 return IN_CTYPE_DOMAIN (c) && isspace (c);
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51 }
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52
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53 /* Verify a requirement at compile-time (unlike assert, which is runtime). */
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54 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
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55
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56 /* Non-GNU systems lack these options, so we don't need to check them. */
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57 #ifndef FNM_CASEFOLD
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58 # define FNM_CASEFOLD 0
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59 #endif
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60 #ifndef FNM_LEADING_DIR
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61 # define FNM_LEADING_DIR 0
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62 #endif
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63
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64 verify (EXCLUDE_macros_do_not_collide_with_FNM_macros,
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65 (((EXCLUDE_ANCHORED | EXCLUDE_INCLUDE | EXCLUDE_WILDCARDS)
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66 & (FNM_PATHNAME | FNM_NOESCAPE | FNM_PERIOD | FNM_LEADING_DIR
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67 | FNM_CASEFOLD))
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68 == 0));
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69
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70 /* An exclude pattern-options pair. The options are fnmatch options
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71 ORed with EXCLUDE_* options. */
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72
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73 struct patopts
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74 {
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75 char const *pattern;
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76 int options;
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77 };
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78
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79 /* An exclude list, of pattern-options pairs. */
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80
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81 struct exclude
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82 {
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83 struct patopts *exclude;
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84 size_t exclude_alloc;
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85 size_t exclude_count;
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86 };
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87
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88 /* Return a newly allocated and empty exclude list. */
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89
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90 struct exclude *
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91 new_exclude (void)
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92 {
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93 return xzalloc (sizeof *new_exclude ());
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94 }
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95
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96 /* Free the storage associated with an exclude list. */
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97
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98 void
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99 free_exclude (struct exclude *ex)
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100 {
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101 free (ex->exclude);
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102 free (ex);
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103 }
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104
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105 /* Return zero if PATTERN matches F, obeying OPTIONS, except that
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106 (unlike fnmatch) wildcards are disabled in PATTERN. */
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107
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108 static int
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109 fnmatch_no_wildcards (char const *pattern, char const *f, int options)
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110 {
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111 if (! (options & FNM_LEADING_DIR))
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112 return ((options & FNM_CASEFOLD)
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113 ? strcasecmp (pattern, f)
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114 : strcmp (pattern, f));
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115 else
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116 {
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117 size_t patlen = strlen (pattern);
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118 int r = ((options & FNM_CASEFOLD)
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119 ? strncasecmp (pattern, f, patlen)
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120 : strncmp (pattern, f, patlen));
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121 if (! r)
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122 {
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123 r = f[patlen];
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124 if (r == '/')
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125 r = 0;
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126 }
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127 return r;
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128 }
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129 }
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130
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131 /* Return true if EX excludes F. */
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132
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133 bool
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134 excluded_filename (struct exclude const *ex, char const *f)
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135 {
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136 size_t exclude_count = ex->exclude_count;
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137
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138 /* If no options are given, the default is to include. */
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139 if (exclude_count == 0)
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140 return false;
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141 else
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142 {
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143 struct patopts const *exclude = ex->exclude;
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144 size_t i;
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145
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146 /* Otherwise, the default is the opposite of the first option. */
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147 bool excluded = !! (exclude[0].options & EXCLUDE_INCLUDE);
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148
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149 /* Scan through the options, seeing whether they change F from
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150 excluded to included or vice versa. */
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151 for (i = 0; i < exclude_count; i++)
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152 {
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153 char const *pattern = exclude[i].pattern;
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154 int options = exclude[i].options;
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155 if (excluded == !! (options & EXCLUDE_INCLUDE))
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156 {
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157 int (*matcher) (char const *, char const *, int) =
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158 (options & EXCLUDE_WILDCARDS
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159 ? fnmatch
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160 : fnmatch_no_wildcards);
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161 bool matched = ((*matcher) (pattern, f, options) == 0);
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162 char const *p;
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163
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164 if (! (options & EXCLUDE_ANCHORED))
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165 for (p = f; *p && ! matched; p++)
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166 if (*p == '/' && p[1] != '/')
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167 matched = ((*matcher) (pattern, p + 1, options) == 0);
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168
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169 excluded ^= matched;
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170 }
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171 }
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172
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173 return excluded;
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174 }
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175 }
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176
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177 /* Append to EX the exclusion PATTERN with OPTIONS. */
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178
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179 void
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180 add_exclude (struct exclude *ex, char const *pattern, int options)
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181 {
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182 struct patopts *patopts;
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183
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184 if (ex->exclude_count == ex->exclude_alloc)
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185 ex->exclude = x2nrealloc (ex->exclude, &ex->exclude_alloc,
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186 sizeof *ex->exclude);
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187
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188 patopts = &ex->exclude[ex->exclude_count++];
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189 patopts->pattern = pattern;
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190 patopts->options = options;
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191 }
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192
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193 /* Use ADD_FUNC to append to EX the patterns in FILENAME, each with
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194 OPTIONS. LINE_END terminates each pattern in the file. If
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195 LINE_END is a space character, ignore trailing spaces and empty
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196 lines in FILE. Return -1 on failure, 0 on success. */
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197
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198 int
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199 add_exclude_file (void (*add_func) (struct exclude *, char const *, int),
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200 struct exclude *ex, char const *filename, int options,
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201 char line_end)
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202 {
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203 bool use_stdin = filename[0] == '-' && !filename[1];
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204 FILE *in;
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205 char *buf = NULL;
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206 char *p;
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207 char const *pattern;
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208 char const *lim;
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209 size_t buf_alloc = 0;
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210 size_t buf_count = 0;
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211 int c;
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212 int e = 0;
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213
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214 if (use_stdin)
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215 in = stdin;
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216 else if (! (in = fopen (filename, "r")))
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217 return -1;
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218
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219 while ((c = getc (in)) != EOF)
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220 {
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221 if (buf_count == buf_alloc)
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222 buf = x2realloc (buf, &buf_alloc);
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223 buf[buf_count++] = c;
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224 }
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225
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226 if (ferror (in))
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227 e = errno;
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228
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229 if (!use_stdin && fclose (in) != 0)
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230 e = errno;
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231
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232 buf = xrealloc (buf, buf_count + 1);
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233 buf[buf_count] = line_end;
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234 lim = buf + buf_count + ! (buf_count == 0 || buf[buf_count - 1] == line_end);
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235 pattern = buf;
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236
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237 for (p = buf; p < lim; p++)
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238 if (*p == line_end)
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239 {
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240 char *pattern_end = p;
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241
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242 if (is_space (line_end))
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243 {
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244 for (; ; pattern_end--)
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245 if (pattern_end == pattern)
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246 goto next_pattern;
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247 else if (! is_space (pattern_end[-1]))
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248 break;
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249 }
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250
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251 *pattern_end = '\0';
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252 (*add_func) (ex, pattern, options);
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253
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254 next_pattern:
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255 pattern = p + 1;
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256 }
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257
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258 errno = e;
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259 return e ? -1 : 0;
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260 }