sysdeps/mach/hurd/readdir_r.c

   1 /* Copyright (C) 1993-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <limits.h>
  20 #include <stddef.h>
  21 #include <string.h>
  22 #include <dirent.h>
  23 #include <unistd.h>
  24 #include <sys/types.h>
  25 #include <hurd.h>
  26 #include <hurd/fd.h>
  27 #include "dirstream.h"
  28
  29
  30 /* Read a directory entry from DIRP.  */
  31 int
  32 __readdir_r (DIR *dirp, struct dirent *entry, struct dirent **result)
  33 {
  34   if (sizeof (struct dirent64) == sizeof (struct dirent))
  35     /* We should in fact just be an alias to readdir64_r on this machine.  */
  36     return __readdir64_r (dirp,
  37                           (struct dirent64 *) entry,
  38                           (struct dirent64 **) result);
  39
  40   struct dirent64 *result64;
  41   union
  42   {
  43     struct dirent64 d;
  44     char b[offsetof (struct dirent64, d_name) + UCHAR_MAX + 1];
  45   } u;
  46   int err;
  47
  48   err = __readdir64_r (dirp, &u.d, &result64);
  49   if (result64)
  50     {
  51       entry->d_fileno = result64->d_fileno;
  52       entry->d_reclen = result64->d_reclen;
  53       entry->d_type = result64->d_type;
  54       entry->d_namlen = result64->d_namlen;
  55       memcpy (entry->d_name, result64->d_name, result64->d_namlen + 1);
  56       *result = entry;
  57     }
  58   else
  59     *result = NULL;
  60
  61   return err;
  62 }
  63
  64 weak_alias (__readdir_r, readdir_r)