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