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annotate lib/same.c @ 17363:5a51fb7777a9

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sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin Problem reported by Marco Atzeri in <http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>. * lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]: Simply delegate to the system <sys/select.h> in this case too. Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to be needed on Solaris either. * lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]: Simply delgate to the system <sys/time.h> in this case.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 19 Mar 2013 09:08:47 -0700
parents e542fd46ad6f
children 344018b6e5d7
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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, 2009-2013 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
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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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 <stdbool.h>
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23 #include <stdio.h>
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24 #include <unistd.h>
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25 #include <stdlib.h>
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26 #include <sys/types.h>
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27 #include <sys/stat.h>
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28 #include <ctype.h>
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29 #include <errno.h>
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30
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31 #include <string.h>
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32
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33 #include <limits.h>
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34 #ifndef _POSIX_NAME_MAX
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35 # define _POSIX_NAME_MAX 14
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36 #endif
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37
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38 #include "same.h"
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39 #include "dirname.h"
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40 #include "error.h"
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41 #include "same-inode.h"
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42
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43 #ifndef MIN
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44 # define MIN(a, b) ((a) < (b) ? (a) : (b))
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45 #endif
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46
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47 /* Return nonzero if SOURCE and DEST point to the same name in the same
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48 directory. */
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49
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50 bool
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51 same_name (const char *source, const char *dest)
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52 {
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53 /* Compare the basenames. */
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54 char const *source_basename = last_component (source);
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55 char const *dest_basename = last_component (dest);
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56 size_t source_baselen = base_len (source_basename);
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57 size_t dest_baselen = base_len (dest_basename);
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58 bool identical_basenames =
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59 (source_baselen == dest_baselen
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60 && memcmp (source_basename, dest_basename, dest_baselen) == 0);
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61 bool compare_dirs = identical_basenames;
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62 bool same = false;
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63
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64 #if ! _POSIX_NO_TRUNC && HAVE_PATHCONF && defined _PC_NAME_MAX
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65 /* This implementation silently truncates components of file names. If
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66 the base names might be truncated, check whether the truncated
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67 base names are the same, while checking the directories. */
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68 size_t slen_max = HAVE_LONG_FILE_NAMES ? 255 : _POSIX_NAME_MAX;
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69 size_t min_baselen = MIN (source_baselen, dest_baselen);
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70 if (slen_max <= min_baselen
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71 && memcmp (source_basename, dest_basename, slen_max) == 0)
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72 compare_dirs = true;
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73 #endif
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74
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75 if (compare_dirs)
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76 {
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77 struct stat source_dir_stats;
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78 struct stat dest_dir_stats;
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79 char *source_dirname, *dest_dirname;
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80
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81 /* Compare the parent directories (via the device and inode numbers). */
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82 source_dirname = dir_name (source);
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83 dest_dirname = dir_name (dest);
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84
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85 if (stat (source_dirname, &source_dir_stats))
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86 {
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87 /* Shouldn't happen. */
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88 error (1, errno, "%s", source_dirname);
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89 }
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90
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91 if (stat (dest_dirname, &dest_dir_stats))
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92 {
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93 /* Shouldn't happen. */
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94 error (1, errno, "%s", dest_dirname);
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95 }
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96
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97 same = SAME_INODE (source_dir_stats, dest_dir_stats);
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98
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99 #if ! _POSIX_NO_TRUNC && HAVE_PATHCONF && defined _PC_NAME_MAX
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100 if (same && ! identical_basenames)
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101 {
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102 long name_max = (errno = 0, pathconf (dest_dirname, _PC_NAME_MAX));
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103 if (name_max < 0)
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104 {
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105 if (errno)
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106 {
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107 /* Shouldn't happen. */
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108 error (1, errno, "%s", dest_dirname);
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109 }
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110 same = false;
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111 }
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112 else
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113 same = (name_max <= min_baselen
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114 && memcmp (source_basename, dest_basename, name_max) == 0);
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115 }
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116 #endif
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117
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118 free (source_dirname);
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119 free (dest_dirname);
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120 }
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121
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122 return same;
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123 }