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Annotation of embedaddon/libiconv/srclib/lstat.c, revision 1.1.1.2

1.1       misho       1: /* Work around a bug of lstat on some systems
                      2: 
1.1.1.2 ! misho       3:    Copyright (C) 1997-2006, 2008-2019 Free Software Foundation, Inc.
1.1       misho       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
1.1.1.2 ! misho      16:    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
1.1       misho      17: 
                     18: /* written by Jim Meyering */
                     19: 
1.1.1.2 ! misho      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
1.1       misho      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: 
1.1.1.2 ! misho      38: static int
1.1       misho      39: orig_lstat (const char *filename, struct stat *buf)
                     40: {
                     41:   return lstat (filename, buf);
                     42: }
                     43: 
                     44: /* Specification.  */
1.1.1.2 ! misho      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"
1.1       misho      55: 
                     56: # include <string.h>
                     57: # include <errno.h>
                     58: 
                     59: /* lstat works differently on Linux and Solaris systems.  POSIX (see
1.1.1.2 ! misho      60:    "pathname resolution" in the glossary) requires that programs like
        !            61:    'ls' take into consideration the fact that FILE has a trailing slash
1.1       misho      62:    when FILE is a symbolic link.  On Linux and Solaris 10 systems, the
                     63:    lstat function already has the desired semantics (in treating
1.1.1.2 ! misho      64:    'lstat ("symlink/", sbuf)' just like 'lstat ("symlink/.", sbuf)',
1.1       misho      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: {
1.1.1.2 ! misho      75:   int result = orig_lstat (file, sbuf);
1.1       misho      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.  */
1.1.1.2 ! misho      82:   if (result == 0)
1.1       misho      83:     {
1.1.1.2 ! misho      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:         }
1.1       misho     100:     }
1.1.1.2 ! misho     101:   return result;
1.1       misho     102: }
                    103: 
                    104: #endif /* HAVE_LSTAT */