Mercurial > hg > octave-kai > gnulib-hg

annotate lib/exclude.c @ 3618:72422d1e9181

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Include unlocked-io.h.
author Jim Meyering <jim@meyering.net>
date Sat, 17 Nov 2001 13:29:42 +0000 (2001-11-17)
parents c08cb8ae6c9c
children 62c996889465
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1 /* exclude.c -- exclude file names
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2
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3 Copyright 1992, 1993, 1994, 1997, 1999, 2000, 2001 Free Software
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4 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 #if HAVE_STDBOOL_H
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28 # include <stdbool.h>
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29 #else
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30 typedef enum {false = 0, true = 1} bool;
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31 #endif
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32
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33 #include <errno.h>
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34 #ifndef errno
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35 extern int errno;
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36 #endif
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37 #include <stdio.h>
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38 #if HAVE_SYS_TYPES_H
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39 # include <sys/types.h>
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40 #endif
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41 #if HAVE_STDLIB_H
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42 # include <stdlib.h>
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43 #endif
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44 #if HAVE_STRING_H
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45 # include <string.h>
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46 #endif
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47 #if HAVE_STRINGS_H
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48 # include <strings.h>
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49 #endif
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50 #if HAVE_INTTYPES_H
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51 # include <inttypes.h>
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52 #else
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53 # if HAVE_STDINT_H
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54 # include <stdint.h>
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55 # endif
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56 #endif
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57
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58 #include "exclude.h"
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59 #include "fnmatch.h"
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60 #include "unlocked-io.h"
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61 #include "xalloc.h"
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62
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63 #ifndef SIZE_MAX
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64 # define SIZE_MAX ((size_t) -1)
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65 #endif
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66
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67 /* Verify a requirement at compile-time (unlike assert, which is runtime). */
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68 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
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69
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70 verify (EXCLUDE_macros_do_not_collide_with_FNM_macros,
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71 (((EXCLUDE_ANCHORED | EXCLUDE_INCLUDE | EXCLUDE_WILDCARDS)
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72 & (FNM_FILE_NAME | FNM_NOESCAPE | FNM_PERIOD | FNM_LEADING_DIR
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73 | FNM_CASEFOLD))
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74 == 0));
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75
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76 /* An exclude pattern-options pair. The options are fnmatch options
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77 ORed with EXCLUDE_* options. */
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78
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79 struct patopts
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80 {
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81 char const *pattern;
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82 int options;
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83 };
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84
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85 /* An exclude list, of pattern-options pairs. */
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86
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87 struct exclude
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88 {
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89 struct patopts *exclude;
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90 size_t exclude_alloc;
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91 size_t exclude_count;
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92 };
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93
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94 /* Return a newly allocated and empty exclude list. */
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95
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96 struct exclude *
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97 new_exclude (void)
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98 {
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99 struct exclude *ex = (struct exclude *) xmalloc (sizeof *ex);
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100 ex->exclude_count = 0;
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101 ex->exclude_alloc = (1 << 6); /* This must be a power of 2. */
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102 ex->exclude = (struct patopts *) xmalloc (ex->exclude_alloc
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103 * sizeof ex->exclude[0]);
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104 return ex;
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105 }
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106
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107 /* Free the storage associated with an exclude list. */
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108
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109 void
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110 free_exclude (struct exclude *ex)
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111 {
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112 free (ex->exclude);
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113 free (ex);
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114 }
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115
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116 /* Return zero if PATTERN matches F, obeying OPTIONS, except that
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117 (unlike fnmatch) wildcards are disabled in PATTERN. */
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118
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119 static int
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120 fnmatch_no_wildcards (char const *pattern, char const *f, int options)
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121 {
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122 if (! (options & FNM_LEADING_DIR))
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123 return ((options & FNM_CASEFOLD)
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124 ? strcasecmp (pattern, f)
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125 : strcmp (pattern, f));
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126 else
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127 {
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128 size_t patlen = strlen (pattern);
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129 int r = ((options & FNM_CASEFOLD)
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130 ? strncasecmp (pattern, f, patlen)
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131 : strncmp (pattern, f, patlen));
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132 if (! r)
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133 {
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134 r = f[patlen];
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135 if (r == '/')
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136 r = 0;
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137 }
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138 return r;
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139 }
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140 }
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141
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142 /* Return true if EX excludes F. */
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143
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144 bool
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145 excluded_filename (struct exclude const *ex, char const *f)
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146 {
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147 size_t exclude_count = ex->exclude_count;
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148
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149 /* If no options are given, the default is to include. */
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150 if (exclude_count == 0)
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151 return false;
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152 else
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153 {
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154 struct patopts const *exclude = ex->exclude;
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155 size_t i;
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156
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157 /* Otherwise, the default is the opposite of the first option. */
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158 bool excluded = !! (exclude[0].options & EXCLUDE_INCLUDE);
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159
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160 /* Scan through the options, seeing whether they change F from
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161 excluded to included or vice versa. */
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162 for (i = 0; i < exclude_count; i++)
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163 {
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164 char const *pattern = exclude[i].pattern;
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165 int options = exclude[i].options;
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166 if (excluded == !! (options & EXCLUDE_INCLUDE))
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167 {
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168 int (*matcher) PARAMS ((char const *, char const *, int)) =
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169 (options & EXCLUDE_WILDCARDS
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170 ? fnmatch
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171 : fnmatch_no_wildcards);
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172 bool matched = ((*matcher) (pattern, f, options) == 0);
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173 char const *p;
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174
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175 if (! (options & EXCLUDE_ANCHORED))
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176 for (p = f; *p && ! matched; p++)
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177 if (*p == '/' && p[1] != '/')
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178 matched = ((*matcher) (pattern, p + 1, options) == 0);
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179
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180 excluded ^= matched;
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181 }
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182 }
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183
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184 return excluded;
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185 }
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186 }
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187
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188 /* Append to EX the exclusion PATTERN with OPTIONS. */
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189
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190 void
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191 add_exclude (struct exclude *ex, char const *pattern, int options)
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192 {
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193 struct patopts *patopts;
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194
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195 if (ex->exclude_alloc <= ex->exclude_count)
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196 {
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197 size_t s = 2 * ex->exclude_alloc;
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198 if (! (0 < s && s <= SIZE_MAX / sizeof ex->exclude[0]))
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199 xalloc_die ();
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200 ex->exclude_alloc = s;
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201 ex->exclude = (struct patopts *) xrealloc (ex->exclude,
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202 s * sizeof ex->exclude[0]);
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203 }
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204
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205 patopts = &ex->exclude[ex->exclude_count++];
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206 patopts->pattern = pattern;
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207 patopts->options = options;
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208 }
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209
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210 /* Use ADD_FUNC to append to EX the patterns in FILENAME, each with
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211 OPTIONS. LINE_END terminates each pattern in the file. Return -1
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212 on failure, 0 on success. */
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213
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214 int
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215 add_exclude_file (void (*add_func) PARAMS ((struct exclude *,
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216 char const *, int)),
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217 struct exclude *ex, char const *filename, int options,
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218 char line_end)
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219 {
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220 bool use_stdin = filename[0] == '-' && !filename[1];
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221 FILE *in;
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222 char *buf;
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223 char *p;
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224 char const *pattern;
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225 char const *lim;
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226 size_t buf_alloc = (1 << 10); /* This must be a power of two. */
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227 size_t buf_count = 0;
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228 int c;
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229 int e = 0;
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230
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231 if (use_stdin)
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232 in = stdin;
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233 else if (! (in = fopen (filename, "r")))
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234 return -1;
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235
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236 buf = xmalloc (buf_alloc);
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237
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238 while ((c = getc (in)) != EOF)
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239 {
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240 buf[buf_count++] = c;
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241 if (buf_count == buf_alloc)
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242 {
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243 buf_alloc *= 2;
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244 if (! buf_alloc)
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245 xalloc_die ();
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246 buf = xrealloc (buf, buf_alloc);
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247 }
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248 }
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249
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250 if (ferror (in))
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251 e = errno;
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252
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253 if (!use_stdin && fclose (in) != 0)
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254 e = errno;
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255
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256 buf = xrealloc (buf, buf_count + 1);
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257
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258 for (pattern = p = buf, lim = buf + buf_count; p <= lim; p++)
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259 if (p < lim ? *p == line_end : buf < p && p[-1])
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260 {
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261 *p = '\0';
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262 (*add_func) (ex, pattern, options);
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263 pattern = p + 1;
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264 }
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265
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266 errno = e;
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267 return e ? -1 : 0;
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268 }