1  /* Define PATH_MAX somehow.  Requires sys/types.h.
       2     Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2021 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 General Public License as published by
       7     the Free Software Foundation; either version 3, 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 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 <https://www.gnu.org/licenses/>.  */
      17  
      18  #ifndef _PATHMAX_H
      19  # define _PATHMAX_H
      20  
      21  /* POSIX:2008 defines PATH_MAX to be the maximum number of bytes in a filename,
      22     including the terminating NUL byte.
      23     <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html>
      24     PATH_MAX is not defined on systems which have no limit on filename length,
      25     such as GNU/Hurd.
      26  
      27     This file does *not* define PATH_MAX always.  Programs that use this file
      28     can handle the GNU/Hurd case in several ways:
      29       - Either with a package-wide handling, or with a per-file handling,
      30       - Either through a
      31           #ifdef PATH_MAX
      32         or through a fallback like
      33           #ifndef PATH_MAX
      34           # define PATH_MAX 8192
      35           #endif
      36         or through a fallback like
      37           #ifndef PATH_MAX
      38           # define PATH_MAX pathconf ("/", _PC_PATH_MAX)
      39           #endif
      40   */
      41  
      42  # include <unistd.h>
      43  
      44  # include <limits.h>
      45  
      46  # ifndef _POSIX_PATH_MAX
      47  #  define _POSIX_PATH_MAX 256
      48  # endif
      49  
      50  /* Don't include sys/param.h if it already has been.  */
      51  # if defined HAVE_SYS_PARAM_H && !defined PATH_MAX && !defined MAXPATHLEN
      52  #  include <sys/param.h>
      53  # endif
      54  
      55  # if !defined PATH_MAX && defined MAXPATHLEN
      56  #  define PATH_MAX MAXPATHLEN
      57  # endif
      58  
      59  # ifdef __hpux
      60  /* On HP-UX, PATH_MAX designates the maximum number of bytes in a filename,
      61     *not* including the terminating NUL byte, and is set to 1023.
      62     Additionally, when _XOPEN_SOURCE is defined to 500 or more, PATH_MAX is
      63     not defined at all any more.  */
      64  #  undef PATH_MAX
      65  #  define PATH_MAX 1024
      66  # endif
      67  
      68  # if defined _WIN32 && ! defined __CYGWIN__
      69  /* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com,
      70     section "Maximum Path Length Limitation",
      71     <https://docs.microsoft.com/en-us/windows/desktop/FileIO/naming-a-file#maximum-path-length-limitation>
      72     explains that the maximum size of a filename, including the terminating
      73     NUL byte, is 260 = 3 + 256 + 1.
      74     This is the same value as
      75       - FILENAME_MAX in <stdio.h>,
      76       - _MAX_PATH in <stdlib.h>,
      77       - MAX_PATH in <windef.h>.
      78     Undefine the original value, because mingw's <limits.h> gets it wrong.  */
      79  #  undef PATH_MAX
      80  #  define PATH_MAX 260
      81  # endif
      82  
      83  #endif /* _PATHMAX_H */