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libiconv v1.14

    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 */