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    This file does *not* define PATH_MAX always.  Programs that use this file
  29    can handle the GNU/Hurd case in several ways:
  30      - Either with a package-wide handling, or with a per-file handling,
  31      - Either through a
  32          #ifdef PATH_MAX
  33        or through a fallback like
  34          #ifndef PATH_MAX
  35          # define PATH_MAX 8192
  36          #endif
  37        or through a fallback like
  38          #ifndef PATH_MAX
  39          # define PATH_MAX pathconf ("/", _PC_PATH_MAX)
  40          #endif
  41  */
  42
  43 # include <unistd.h>
  44
  45 # include <limits.h>
  46
  47 # ifndef _POSIX_PATH_MAX
  48 #  define _POSIX_PATH_MAX 256
  49 # endif
  50
  51 /* Don't include sys/param.h if it already has been.  */
  52 # if defined HAVE_SYS_PARAM_H && !defined PATH_MAX && !defined MAXPATHLEN
  53 #  include <sys/param.h>
  54 # endif
  55
  56 # if !defined PATH_MAX && defined MAXPATHLEN
  57 #  define PATH_MAX MAXPATHLEN
  58 # endif
  59
  60 # ifdef __hpux
  61 /* On HP-UX, PATH_MAX designates the maximum number of bytes in a filename,
  62    *not* including the terminating NUL byte, and is set to 1023.
  63    Additionally, when _XOPEN_SOURCE is defined to 500 or more, PATH_MAX is
  64    not defined at all any more.  */
  65 #  undef PATH_MAX
  66 #  define PATH_MAX 1024
  67 # endif
  68
  69 # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  70 /* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com,
  71    section "Maximum Path Length Limitation",
  72    <http://msdn.microsoft.com/en-us/library/aa365247(v=vs.85).aspx#maxpath>
  73    explains that the maximum size of a filename, including the terminating
  74    NUL byte, is 260 = 3 + 256 + 1.
  75    This is the same value as
  76      - FILENAME_MAX in <stdio.h>,
  77      - _MAX_PATH in <stdlib.h>,
  78      - MAX_PATH in <windef.h>.
  79    Undefine the original value, because mingw's <limits.h> gets it wrong.  */
  80 #  undef PATH_MAX
  81 #  define PATH_MAX 260
  82 # endif
  83
  84 #endif /* _PATHMAX_H */