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annotate lib/stat.c @ 4739:04758f7475fd

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Merge changes from glibc.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 26 Sep 2003 07:35:01 +0000
parents 7135d3d3d962
children a535859efd14
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1 /* Work around the bug in some systems whereby stat/lstat succeeds when
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2 given the zero-length file name argument. The stat/lstat from SunOS 4.1.4
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3 has this bug. Also work around a deficiency in Solaris systems (up to at
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4 least Solaris 9) regarding the semantics of `lstat ("symlink/", sbuf).'
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5
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6 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free
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7 Software Foundation, Inc.
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8
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9 This program is free software; you can redistribute it and/or modify
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10 it under the terms of the GNU General Public License as published by
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11 the Free Software Foundation; either version 2, or (at your option)
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12 any later version.
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13
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14 This program is distributed in the hope that it will be useful,
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15 but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 GNU General Public License for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with this program; if not, write to the Free Software Foundation,
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21 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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23 /* written by Jim Meyering */
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25 #include <config.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 <errno.h>
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30 #ifndef errno
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31 extern int errno;
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32 #endif
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33 #if defined LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
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34 # include <stdlib.h>
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35 # include <string.h>
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36
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37 # ifdef STAT_MACROS_BROKEN
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38 # undef S_ISLNK
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39 # endif
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40
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41 # ifndef S_ISLNK
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42 # ifdef S_IFLNK
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43 # define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
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44 # else
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45 # define S_ISLNK(m) 0
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46 # endif
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47 # endif
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48
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49 # include "xalloc.h"
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50
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51 /* lstat works differently on Linux and Solaris systems. POSIX (see
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52 `pathname resolution' in the glossary) requires that programs like `ls'
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53 take into consideration the fact that FILE has a trailing slash when
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54 FILE is a symbolic link. On Linux systems, the lstat function already
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55 has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
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56 `lstat("symlink/.",sbuf)', but on Solaris it does not.
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57
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58 If FILE has a trailing slash and specifies a symbolic link,
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59 then append a `.' to FILE and call lstat a second time. */
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60
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61 static int
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62 slash_aware_lstat (const char *file, struct stat *sbuf)
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63 {
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64 size_t len;
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65 char *new_file;
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66
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67 int lstat_result = lstat (file, sbuf);
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68
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69 if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
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70 return lstat_result;
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71
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72 len = strlen (file);
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73 if (file[len - 1] != '/')
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74 return lstat_result;
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75
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76 /* FILE refers to a symbolic link and the name ends with a slash.
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77 Append a `.' to FILE and repeat the lstat call. */
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78
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79 /* Add one for the `.' we'll append, and one more for the trailing NUL. */
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80 new_file = xmalloc (len + 1 + 1);
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81 memcpy (new_file, file, len);
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82 new_file[len] = '.';
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83 new_file[len + 1] = 0;
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84
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85 lstat_result = lstat (new_file, sbuf);
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86 free (new_file);
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87
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88 return lstat_result;
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89 }
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90 #endif /* LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK */
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91
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92 /* This is a wrapper for stat/lstat.
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93 If FILE is the empty string, fail with errno == ENOENT.
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94 Otherwise, return the result of calling the real stat/lstat.
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95
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96 This works around the bug in some systems whereby stat/lstat succeeds when
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97 given the zero-length file name argument. The stat/lstat from SunOS 4.1.4
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98 has this bug. */
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99
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100 /* This function also provides a version of lstat with consistent semantics
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101 when FILE specifies a symbolic link and has a trailing slash. */
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102
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103 #ifdef LSTAT
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104 # define rpl_xstat rpl_lstat
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105 # if ! LSTAT_FOLLOWS_SLASHED_SYMLINK
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106 # define xstat_return_val(F, S) slash_aware_lstat (F, S)
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107 # else
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108 # define xstat_return_val(F, S) lstat (F, S)
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109 # endif
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110 #else
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111 # define rpl_xstat rpl_stat
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112 # define xstat_return_val(F, S) stat (F, S)
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113 #endif
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114
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115 int
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116 rpl_xstat (const char *file, struct stat *sbuf)
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117 {
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118 if (file && *file == 0)
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119 {
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120 errno = ENOENT;
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121 return -1;
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122 }
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123
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124 return xstat_return_val (file, sbuf);
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125 }