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annotate lib/stat.c @ 4060:bf15ee79dcc2

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* stat.c: New file. Contents mostly from xstat.in. Rework so that it may serve to define rpl_lstat, too.
author Jim Meyering <jim@meyering.net>
date Wed, 04 Dec 2002 10:11:15 +0000
parents
children 91433623b923
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4060
bf15ee79dcc2 * stat.c: New file. Contents mostly from xstat.in.
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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 SunOS4.1.4
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3 has this bug.
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4 Copyright (C) 1997-2002 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; if not, write to the Free Software Foundation,
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18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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19
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20 /* written by Jim Meyering */
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21
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22 #include <config.h>
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23
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24 #include <sys/types.h>
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25 #include <sys/stat.h>
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26 #include <errno.h>
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27 #ifndef errno
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28 extern int errno;
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29 #endif
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30 #ifdef LSTAT
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31 # include <string.h>
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32
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33 # if HAVE_STDLIB_H
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34 # include <stdlib.h>
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35 # endif
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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 # ifndef HAVE_DECL_FREE
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50 "this configure-time declaration test was not run"
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51 # endif
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52 # if !HAVE_DECL_FREE
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53 void free ();
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54 # endif
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55
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56 char *xmalloc ();
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57
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58 /* lstat works differently on Linux and Solaris systems. POSIX (see
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59 `pathname resolution' in the glossary) requires that programs like `ls'
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60 take into consideration the fact that FILE has a trailing slash when
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61 FILE is a symbolic link. On Linux systems, the lstat function already
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62 has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
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63 `lstat("symlink/.",sbuf)', but on Solaris it does not.
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64
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65 If FILE has a trailing slash and specifies a symbolic link,
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66 then append a `.' to FILE and call lstat a second time. */
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67
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68 static int
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69 slash_aware_lstat (const char *file, struct stat *sbuf)
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70 {
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71 size_t len;
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72 char *new_file;
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73
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74 int lstat_result = lstat (file, sbuf);
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75
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76 if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
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77 return lstat_result;
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78
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79 len = strlen (file);
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80 if (file[len - 1] != '/')
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81 return lstat_result;
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82
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83 /* FILE refers to a symbolic link and the name ends with a slash.
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84 Append a `.' to FILE and repeat the lstat call. */
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85
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86 /* Add one for the `.' we'll append, and one more for the trailing NUL. */
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87 new_file = xmalloc (len + 1 + 1);
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88 memcpy (new_file, file, len);
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89 new_file[len] = '.';
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90 new_file[len + 1] = 0;
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91
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92 lstat_result = lstat (new_file, sbuf);
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93 free (new_file);
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94
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95 return lstat_result;
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96 }
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97 #endif /* LSTAT */
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98
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99 /* This is a wrapper for stat/lstat.
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100 If FILE is the empty string, fail with errno == ENOENT.
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101 Otherwise, return the result of calling the real stat/lstat.
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102
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103 This works around the bug in some systems whereby stat/lstat succeeds when
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104 given the zero-length file name argument. The stat/lstat from SunOS4.1.4
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105 has this bug. */
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106
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107 /* This function also provides a version of lstat with consistent semantics
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108 when FILE specifies a symbolic link and has a trailing slash. */
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109
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110 #ifdef LSTAT
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111 # define rpl_xstat rpl_lstat
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112 # define xstat_return_val(F, S) slash_aware_lstat (F, S)
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113 #else
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114 # define rpl_xstat rpl_stat
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115 # define xstat_return_val(F, S) stat (F, S)
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116 #endif
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117
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118 int
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119 rpl_xstat (const char *file, struct stat *sbuf)
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120 {
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121 if (file && *file == 0)
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122 {
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123 errno = ENOENT;
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124 return -1;
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125 }
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126
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127 return xstat_return_val (file, sbuf);
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128 }