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libiconv 1.16

    1: /* Work around a bug of lstat on some systems
    2: 
    3:    Copyright (C) 1997-2006, 2008-2019 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 <https://www.gnu.org/licenses/>.  */
   17: 
   18: /* written by Jim Meyering */
   19: 
   20: /* If the user's config.h happens to include <sys/stat.h>, let it include only
   21:    the system's <sys/stat.h> here, so that orig_lstat doesn't recurse to
   22:    rpl_lstat.  */
   23: #define __need_system_sys_stat_h
   24: #include <config.h>
   25: 
   26: #if !HAVE_LSTAT
   27: /* On systems that lack symlinks, our replacement <sys/stat.h> already
   28:    defined lstat as stat, so there is nothing further to do other than
   29:    avoid an empty file.  */
   30: typedef int dummy;
   31: #else /* HAVE_LSTAT */
   32: 
   33: /* Get the original definition of lstat.  It might be defined as a macro.  */
   34: # include <sys/types.h>
   35: # include <sys/stat.h>
   36: # undef __need_system_sys_stat_h
   37: 
   38: static int
   39: orig_lstat (const char *filename, struct stat *buf)
   40: {
   41:   return lstat (filename, buf);
   42: }
   43: 
   44: /* Specification.  */
   45: # ifdef __osf__
   46: /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
   47:    eliminates this include because of the preliminary #include <sys/stat.h>
   48:    above.  */
   49: #  include "sys/stat.h"
   50: # else
   51: #  include <sys/stat.h>
   52: # endif
   53: 
   54: # include "stat-time.h"
   55: 
   56: # include <string.h>
   57: # include <errno.h>
   58: 
   59: /* lstat works differently on Linux and Solaris systems.  POSIX (see
   60:    "pathname resolution" in the glossary) requires that programs like
   61:    'ls' take into consideration the fact that FILE has a trailing slash
   62:    when FILE is a symbolic link.  On Linux and Solaris 10 systems, the
   63:    lstat function already has the desired semantics (in treating
   64:    'lstat ("symlink/", sbuf)' just like 'lstat ("symlink/.", sbuf)',
   65:    but on Solaris 9 and earlier it does not.
   66: 
   67:    If FILE has a trailing slash and specifies a symbolic link,
   68:    then use stat() to get more info on the referent of FILE.
   69:    If the referent is a non-directory, then set errno to ENOTDIR
   70:    and return -1.  Otherwise, return stat's result.  */
   71: 
   72: int
   73: rpl_lstat (const char *file, struct stat *sbuf)
   74: {
   75:   int result = orig_lstat (file, sbuf);
   76: 
   77:   /* This replacement file can blindly check against '/' rather than
   78:      using the ISSLASH macro, because all platforms with '\\' either
   79:      lack symlinks (mingw) or have working lstat (cygwin) and thus do
   80:      not compile this file.  0 len should have already been filtered
   81:      out above, with a failure return of ENOENT.  */
   82:   if (result == 0)
   83:     {
   84:       if (S_ISDIR (sbuf->st_mode) || file[strlen (file) - 1] != '/')
   85:         result = stat_time_normalize (result, sbuf);
   86:       else
   87:         {
   88:           /* At this point, a trailing slash is permitted only on
   89:              symlink-to-dir; but it should have found information on the
   90:              directory, not the symlink.  Call 'stat' to get info about the
   91:              link's referent.  Our replacement stat guarantees valid results,
   92:              even if the symlink is not pointing to a directory.  */
   93:           if (!S_ISLNK (sbuf->st_mode))
   94:             {
   95:               errno = ENOTDIR;
   96:               return -1;
   97:             }
   98:           result = stat (file, sbuf);
   99:         }
  100:     }
  101:   return result;
  102: }
  103: 
  104: #endif /* HAVE_LSTAT */