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annotate lib/same.c @ 40186:8964917f9574

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autoupdate
author Karl Berry <karl@freefriends.org>
date Mon, 18 Feb 2019 08:02:49 -0800
parents b06060465f09
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2092
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1 /* Determine whether two file names refer to the same file.
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2
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3 Copyright (C) 1997-2000, 2002-2006, 2009-2019 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
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8 (at your option) any later version.
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9
0cf0dc1ce656 add copyright/no-warranty comment
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10 This program is distributed in the hope that it will be useful,
0cf0dc1ce656 add copyright/no-warranty comment
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
0cf0dc1ce656 add copyright/no-warranty comment
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
0cf0dc1ce656 add copyright/no-warranty comment
Jim Meyering <jim@meyering.net>
parents: 1857
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13 GNU General Public License for more details.
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parents: 1857
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14
0cf0dc1ce656 add copyright/no-warranty comment
Jim Meyering <jim@meyering.net>
parents: 1857
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15 You should have received a copy of the GNU General Public License
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Paul Eggert <eggert@cs.ucla.edu>
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16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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17
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Jim Meyering <jim@meyering.net>
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18 /* written by Jim Meyering */
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19
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20 #include <config.h>
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21
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22 #include <fcntl.h>
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23 #include <stdbool.h>
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24 #include <stdio.h>
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25 #include <unistd.h>
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26 #include <stdlib.h>
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27 #include <sys/types.h>
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28 #include <sys/stat.h>
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29 #include <ctype.h>
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30 #include <errno.h>
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31
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32 #include <string.h>
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33
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34 #include <limits.h>
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35 #ifndef _POSIX_NAME_MAX
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36 # define _POSIX_NAME_MAX 14
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37 #endif
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38
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39 #include "same.h"
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40 #include "dirname.h"
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41 #include "error.h"
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42 #include "same-inode.h"
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43
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44 #ifndef MIN
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45 # define MIN(a, b) ((a) < (b) ? (a) : (b))
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46 #endif
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47
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48 /* Whether file name components are silently truncated (behavior that
00bffdd9af60 same: new function same_nameat
Paul Eggert <eggert@cs.ucla.edu>
parents: 19484
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49 POSIX stopped allowing in 2008). This enables checks whether
00bffdd9af60 same: new function same_nameat
Paul Eggert <eggert@cs.ucla.edu>
parents: 19484
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50 truncated base names are the same, while checking the directories. */
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51 #if !_POSIX_NO_TRUNC && HAVE_FPATHCONF && defined _PC_NAME_MAX
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52 # define CHECK_TRUNCATION true
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53 #else
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54 # define CHECK_TRUNCATION false
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55 #endif
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56
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57 /* Return nonzero if SOURCE and DEST point to the same name in the same
f47e2d0bff02 New file (function extracted from ln.c).
Jim Meyering <jim@meyering.net>
parents:
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58 directory. */
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59
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60 bool
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61 same_name (const char *source, const char *dest)
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62 {
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63 return same_nameat (AT_FDCWD, source, AT_FDCWD, dest);
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64 }
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65
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66 /* Likewise, but interpret the file names relative to SOURCE_FD and DEST_FD,
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67 in the style of openat. */
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68
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69 bool
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70 same_nameat (int source_dfd, char const *source,
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71 int dest_dfd, char const *dest)
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72 {
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73 /* Compare the basenames. */
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74 char const *source_basename = last_component (source);
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75 char const *dest_basename = last_component (dest);
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76 size_t source_baselen = base_len (source_basename);
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77 size_t dest_baselen = base_len (dest_basename);
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78 bool identical_basenames =
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79 (source_baselen == dest_baselen
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80 && memcmp (source_basename, dest_basename, dest_baselen) == 0);
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81 bool compare_dirs = identical_basenames;
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82 bool same = false;
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83
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84 #if CHECK_TRUNCATION
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85 size_t slen_max = HAVE_LONG_FILE_NAMES ? 255 : _POSIX_NAME_MAX;
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86 size_t min_baselen = MIN (source_baselen, dest_baselen);
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87 if (slen_max <= min_baselen
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88 && memcmp (source_basename, dest_basename, slen_max) == 0)
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89 compare_dirs = true;
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90 #endif
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91
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92 if (compare_dirs)
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93 {
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94 struct stat source_dir_stats;
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95 struct stat dest_dir_stats;
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96
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97 /* Compare the parent directories (via the device and inode numbers). */
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98 char *source_dirname = dir_name (source);
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99 int flags = AT_SYMLINK_NOFOLLOW;
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100 if (fstatat (source_dfd, source_dirname, &source_dir_stats, flags) != 0)
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101 {
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102 /* Shouldn't happen. */
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103 error (1, errno, "%s", source_dirname);
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104 }
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105 free (source_dirname);
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106
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107 char *dest_dirname = dir_name (dest);
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108
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109 #if CHECK_TRUNCATION
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110 int destdir_errno = 0;
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111 int open_flags = O_SEARCH | O_CLOEXEC | O_DIRECTORY;
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112 int destdir_fd = openat (dest_dfd, dest_dirname, open_flags);
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113 if (destdir_fd < 0 || fstat (destdir_fd, &dest_dir_stats) != 0)
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114 destdir_errno = errno;
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115 else if (SAME_INODE (source_dir_stats, dest_dir_stats))
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116 {
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117 same = identical_basenames;
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118 if (! same)
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119 {
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120 errno = 0;
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121 long name_max = fpathconf (destdir_fd, _PC_NAME_MAX);
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122 if (name_max < 0)
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123 destdir_errno = errno;
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124 else
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125 same = (name_max <= min_baselen
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126 && (memcmp (source_basename, dest_basename, name_max)
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127 == 0));
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128 }
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129 }
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Paul Eggert <eggert@cs.ucla.edu>
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130 close (destdir_fd);
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parents: 19484
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131 if (destdir_errno != 0)
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132 {
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133 /* Shouldn't happen. */
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134 error (1, destdir_errno, "%s", dest_dirname);
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135 }
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136 #else
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137 if (fstatat (dest_dfd, dest_dirname, &dest_dir_stats, flags) != 0)
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138 {
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139 /* Shouldn't happen. */
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diff changeset
140 error (1, errno, "%s", dest_dirname);
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 12069
diff changeset
141 }
4910
de285d9e7c4d Merge from coreutils.
Paul Eggert <eggert@cs.ucla.edu>
parents: 4674
diff changeset
142 same = SAME_INODE (source_dir_stats, dest_dir_stats);
de285d9e7c4d Merge from coreutils.
Paul Eggert <eggert@cs.ucla.edu>
parents: 4674
diff changeset
143 #endif
de285d9e7c4d Merge from coreutils.
Paul Eggert <eggert@cs.ucla.edu>
parents: 4674
diff changeset
144
4179
7dd6887fa0db Optimization: Avoid unnecessary stat() calls.
Bruno Haible <bruno@clisp.org>
parents: 3966
diff changeset
145 free (dest_dirname);
7dd6887fa0db Optimization: Avoid unnecessary stat() calls.
Bruno Haible <bruno@clisp.org>
parents: 3966
diff changeset
146 }
7dd6887fa0db Optimization: Avoid unnecessary stat() calls.
Bruno Haible <bruno@clisp.org>
parents: 3966
diff changeset
147
4910
de285d9e7c4d Merge from coreutils.
Paul Eggert <eggert@cs.ucla.edu>
parents: 4674
diff changeset
148 return same;
1857
f47e2d0bff02 New file (function extracted from ln.c).
Jim Meyering <jim@meyering.net>
parents:
diff changeset
149 }