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annotate lib/stat.c @ 5382:72833e3704a0

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* getdate.y [!TEST]: Include <stdio.h>, since we use sprintf now. (get_date): Overparenthesize to avoid GCC warning.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 02 Nov 2004 19:18:44 +0000
parents a535859efd14
children a48fb0e98c8c
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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, 2004 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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24
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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 #if defined LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
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31 # include <stdlib.h>
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32 # include <string.h>
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33
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34 # include "stat-macros.h"
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35 # include "xalloc.h"
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36
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37 /* lstat works differently on Linux and Solaris systems. POSIX (see
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38 `pathname resolution' in the glossary) requires that programs like `ls'
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39 take into consideration the fact that FILE has a trailing slash when
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40 FILE is a symbolic link. On Linux systems, the lstat function already
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41 has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
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42 `lstat("symlink/.",sbuf)', but on Solaris it does not.
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43
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44 If FILE has a trailing slash and specifies a symbolic link,
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45 then append a `.' to FILE and call lstat a second time. */
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46
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47 static int
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48 slash_aware_lstat (const char *file, struct stat *sbuf)
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49 {
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50 size_t len;
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51 char *new_file;
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52
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53 int lstat_result = lstat (file, sbuf);
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54
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55 if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
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56 return lstat_result;
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57
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58 len = strlen (file);
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59 if (file[len - 1] != '/')
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60 return lstat_result;
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61
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62 /* FILE refers to a symbolic link and the name ends with a slash.
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63 Append a `.' to FILE and repeat the lstat call. */
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64
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65 /* Add one for the `.' we'll append, and one more for the trailing NUL. */
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66 new_file = xmalloc (len + 1 + 1);
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67 memcpy (new_file, file, len);
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68 new_file[len] = '.';
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69 new_file[len + 1] = 0;
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70
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71 lstat_result = lstat (new_file, sbuf);
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72 free (new_file);
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73
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74 return lstat_result;
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75 }
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76 #endif /* LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK */
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77
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78 /* This is a wrapper for stat/lstat.
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79 If FILE is the empty string, fail with errno == ENOENT.
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80 Otherwise, return the result of calling the real stat/lstat.
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81
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82 This works around the bug in some systems whereby stat/lstat succeeds when
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84 has this bug. */
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85
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86 /* This function also provides a version of lstat with consistent semantics
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87 when FILE specifies a symbolic link and has a trailing slash. */
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88
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89 #ifdef LSTAT
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90 # define rpl_xstat rpl_lstat
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91 # if ! LSTAT_FOLLOWS_SLASHED_SYMLINK
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92 # define xstat_return_val(F, S) slash_aware_lstat (F, S)
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93 # else
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94 # define xstat_return_val(F, S) lstat (F, S)
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95 # endif
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96 #else
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97 # define rpl_xstat rpl_stat
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98 # define xstat_return_val(F, S) stat (F, S)
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99 #endif
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100
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101 int
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102 rpl_xstat (const char *file, struct stat *sbuf)
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103 {
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104 if (file && *file == 0)
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105 {
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106 errno = ENOENT;
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107 return -1;
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108 }
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109
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110 return xstat_return_val (file, sbuf);
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111 }