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libiconv v1.14

    1: /* Work around platform bugs in stat.
    2:    Copyright (C) 2009-2011 Free Software Foundation, Inc.
    3: 
    4:    This program is free software: you can redistribute it and/or modify
    5:    it under the terms of the GNU General Public License as published by
    6:    the Free Software Foundation; either version 3 of the License, or
    7:    (at your option) any later version.
    8: 
    9:    This program is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12:    GNU General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU General Public License
   15:    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   16: 
   17: /* written by Eric Blake */
   18: 
   19: #include <config.h>
   20: 
   21: /* Get the original definition of stat.  It might be defined as a macro.  */
   22: #define __need_system_sys_stat_h
   23: #include <sys/types.h>
   24: #include <sys/stat.h>
   25: #undef __need_system_sys_stat_h
   26: 
   27: static inline int
   28: orig_stat (const char *filename, struct stat *buf)
   29: {
   30:   return stat (filename, buf);
   31: }
   32: 
   33: /* Specification.  */
   34: #include <sys/stat.h>
   35: 
   36: #include <errno.h>
   37: #include <limits.h>
   38: #include <stdbool.h>
   39: #include <string.h>
   40: #include "dosname.h"
   41: #include "verify.h"
   42: 
   43: /* Store information about NAME into ST.  Work around bugs with
   44:    trailing slashes.  Mingw has other bugs (such as st_ino always
   45:    being 0 on success) which this wrapper does not work around.  But
   46:    at least this implementation provides the ability to emulate fchdir
   47:    correctly.  */
   48: 
   49: int
   50: rpl_stat (char const *name, struct stat *st)
   51: {
   52:   int result = orig_stat (name, st);
   53: #if REPLACE_FUNC_STAT_FILE
   54:   /* Solaris 9 mistakenly succeeds when given a non-directory with a
   55:      trailing slash.  */
   56:   if (result == 0 && !S_ISDIR (st->st_mode))
   57:     {
   58:       size_t len = strlen (name);
   59:       if (ISSLASH (name[len - 1]))
   60:         {
   61:           errno = ENOTDIR;
   62:           return -1;
   63:         }
   64:     }
   65: #endif /* REPLACE_FUNC_STAT_FILE */
   66: #if REPLACE_FUNC_STAT_DIR
   67:   /* The only known systems where REPLACE_FUNC_STAT_DIR is needed also
   68:      have a constant PATH_MAX.  */
   69: # ifndef PATH_MAX
   70: #  error "Please port this replacement to your platform"
   71: # endif
   72: 
   73:   if (result == -1 && errno == ENOENT)
   74:     {
   75:       /* Due to mingw's oddities, there are some directories (like
   76:          c:\) where stat() only succeeds with a trailing slash, and
   77:          other directories (like c:\windows) where stat() only
   78:          succeeds without a trailing slash.  But we want the two to be
   79:          synonymous, since chdir() manages either style.  Likewise, Mingw also
   80:          reports ENOENT for names longer than PATH_MAX, when we want
   81:          ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR.
   82:          Fortunately, mingw PATH_MAX is small enough for stack
   83:          allocation.  */
   84:       char fixed_name[PATH_MAX + 1] = {0};
   85:       size_t len = strlen (name);
   86:       bool check_dir = false;
   87:       verify (PATH_MAX <= 4096);
   88:       if (PATH_MAX <= len)
   89:         errno = ENAMETOOLONG;
   90:       else if (len)
   91:         {
   92:           strcpy (fixed_name, name);
   93:           if (ISSLASH (fixed_name[len - 1]))
   94:             {
   95:               check_dir = true;
   96:               while (len && ISSLASH (fixed_name[len - 1]))
   97:                 fixed_name[--len] = '\0';
   98:               if (!len)
   99:                 fixed_name[0] = '/';
  100:             }
  101:           else
  102:             fixed_name[len++] = '/';
  103:           result = orig_stat (fixed_name, st);
  104:           if (result == 0 && check_dir && !S_ISDIR (st->st_mode))
  105:             {
  106:               result = -1;
  107:               errno = ENOTDIR;
  108:             }
  109:         }
  110:     }
  111: #endif /* REPLACE_FUNC_STAT_DIR */
  112:   return result;
  113: }