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Annotation of embedaddon/libiconv/srclib/lstat.c, revision 1.1.1.1

1.1       misho       1: /* Work around a bug of lstat on some systems
                      2: 
                      3:    Copyright (C) 1997-2006, 2008-2011 Free Software Foundation, Inc.
                      4: 
                      5:    This program is free software: you can redistribute it and/or modify
                      6:    it under the terms of the GNU General Public License as published by
                      7:    the Free Software Foundation; either version 3 of the License, or
                      8:    (at your option) any later version.
                      9: 
                     10:    This program is distributed in the hope that it will be useful,
                     11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
                     12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     13:    GNU General Public License for more details.
                     14: 
                     15:    You should have received a copy of the GNU General Public License
                     16:    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
                     17: 
                     18: /* written by Jim Meyering */
                     19: 
                     20: #include <config.h>
                     21: 
                     22: #if !HAVE_LSTAT
                     23: /* On systems that lack symlinks, our replacement <sys/stat.h> already
                     24:    defined lstat as stat, so there is nothing further to do other than
                     25:    avoid an empty file.  */
                     26: typedef int dummy;
                     27: #else /* HAVE_LSTAT */
                     28: 
                     29: /* Get the original definition of lstat.  It might be defined as a macro.  */
                     30: # define __need_system_sys_stat_h
                     31: # include <sys/types.h>
                     32: # include <sys/stat.h>
                     33: # undef __need_system_sys_stat_h
                     34: 
                     35: static inline int
                     36: orig_lstat (const char *filename, struct stat *buf)
                     37: {
                     38:   return lstat (filename, buf);
                     39: }
                     40: 
                     41: /* Specification.  */
                     42: # include <sys/stat.h>
                     43: 
                     44: # include <string.h>
                     45: # include <errno.h>
                     46: 
                     47: /* lstat works differently on Linux and Solaris systems.  POSIX (see
                     48:    `pathname resolution' in the glossary) requires that programs like
                     49:    `ls' take into consideration the fact that FILE has a trailing slash
                     50:    when FILE is a symbolic link.  On Linux and Solaris 10 systems, the
                     51:    lstat function already has the desired semantics (in treating
                     52:    `lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)',
                     53:    but on Solaris 9 and earlier it does not.
                     54: 
                     55:    If FILE has a trailing slash and specifies a symbolic link,
                     56:    then use stat() to get more info on the referent of FILE.
                     57:    If the referent is a non-directory, then set errno to ENOTDIR
                     58:    and return -1.  Otherwise, return stat's result.  */
                     59: 
                     60: int
                     61: rpl_lstat (const char *file, struct stat *sbuf)
                     62: {
                     63:   size_t len;
                     64:   int lstat_result = orig_lstat (file, sbuf);
                     65: 
                     66:   if (lstat_result != 0)
                     67:     return lstat_result;
                     68: 
                     69:   /* This replacement file can blindly check against '/' rather than
                     70:      using the ISSLASH macro, because all platforms with '\\' either
                     71:      lack symlinks (mingw) or have working lstat (cygwin) and thus do
                     72:      not compile this file.  0 len should have already been filtered
                     73:      out above, with a failure return of ENOENT.  */
                     74:   len = strlen (file);
                     75:   if (file[len - 1] != '/' || S_ISDIR (sbuf->st_mode))
                     76:     return 0;
                     77: 
                     78:   /* At this point, a trailing slash is only permitted on
                     79:      symlink-to-dir; but it should have found information on the
                     80:      directory, not the symlink.  Call stat() to get info about the
                     81:      link's referent.  Our replacement stat guarantees valid results,
                     82:      even if the symlink is not pointing to a directory.  */
                     83:   if (!S_ISLNK (sbuf->st_mode))
                     84:     {
                     85:       errno = ENOTDIR;
                     86:       return -1;
                     87:     }
                     88:   return stat (file, sbuf);
                     89: }
                     90: 
                     91: #endif /* HAVE_LSTAT */