lib/pathmax.h

   1 /* Define PATH_MAX somehow.  Requires sys/types.h.
   2    Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2011 Free Software
   3    Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    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 Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #ifndef _PATHMAX_H
  20 # define _PATHMAX_H
  21
  22 /* POSIX:2008 defines PATH_MAX to be the maximum number of bytes in a filename,
  23    including the terminating NUL byte.
  24    <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html>
  25    PATH_MAX is not defined on systems which have no limit on filename length,
  26    such as GNU/Hurd.  */
  27
  28 # include <unistd.h>
  29
  30 # include <limits.h>
  31
  32 # ifndef _POSIX_PATH_MAX
  33 #  define _POSIX_PATH_MAX 256
  34 # endif
  35
  36 # if !defined PATH_MAX && defined _PC_PATH_MAX && defined HAVE_PATHCONF
  37 #  define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 \
  38                     : pathconf ("/", _PC_PATH_MAX))
  39 # endif
  40
  41 /* Don't include sys/param.h if it already has been.  */
  42 # if defined HAVE_SYS_PARAM_H && !defined PATH_MAX && !defined MAXPATHLEN
  43 #  include <sys/param.h>
  44 # endif
  45
  46 # if !defined PATH_MAX && defined MAXPATHLEN
  47 #  define PATH_MAX MAXPATHLEN
  48 # endif
  49
  50 # ifndef PATH_MAX
  51 #  define PATH_MAX _POSIX_PATH_MAX
  52 # endif
  53
  54 # ifdef __hpux
  55 /* On HP-UX, PATH_MAX designates the maximum number of bytes in a filename,
  56    *not* including the terminating NUL byte, and is set to 1023.
  57    Additionally, when _XOPEN_SOURCE is defined to 500 or more, PATH_MAX is
  58    not defined at all any more.  */
  59 #  undef PATH_MAX
  60 #  define PATH_MAX 1024
  61 # endif
  62
  63 #endif /* _PATHMAX_H */