1  /* Define PATH_MAX somehow.  Requires sys/types.h.
       2     Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2023 Free Software
       3     Foundation, Inc.
       4  
       5     This file is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU Lesser General Public License as
       7     published by the Free Software Foundation; either version 2.1 of the
       8     License, or (at your option) any later version.
       9  
      10     This file 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, 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  /* This file uses HAVE_SYS_PARAM_H.  */
      43  # if !_GL_CONFIG_H_INCLUDED
      44  #  error "Please include config.h first."
      45  # endif
      46  
      47  # include <unistd.h>
      48  
      49  # include <limits.h>
      50  
      51  # ifndef _POSIX_PATH_MAX
      52  #  define _POSIX_PATH_MAX 256
      53  # endif
      54  
      55  /* Don't include sys/param.h if it already has been.  */
      56  # if defined HAVE_SYS_PARAM_H && !defined PATH_MAX && !defined MAXPATHLEN
      57  #  include <sys/param.h>
      58  # endif
      59  
      60  # if !defined PATH_MAX && defined MAXPATHLEN
      61  #  define PATH_MAX MAXPATHLEN
      62  # endif
      63  
      64  # ifdef __hpux
      65  /* On HP-UX, PATH_MAX designates the maximum number of bytes in a filename,
      66     *not* including the terminating NUL byte, and is set to 1023.
      67     Additionally, when _XOPEN_SOURCE is defined to 500 or more, PATH_MAX is
      68     not defined at all any more.  */
      69  #  undef PATH_MAX
      70  #  define PATH_MAX 1024
      71  # endif
      72  
      73  # if defined _WIN32 && ! defined __CYGWIN__
      74  /* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com,
      75     section "Maximum Path Length Limitation",
      76     <https://docs.microsoft.com/en-us/windows/desktop/FileIO/naming-a-file#maximum-path-length-limitation>
      77     explains that the maximum size of a filename, including the terminating
      78     NUL byte, is 260 = 3 + 256 + 1.
      79     This is the same value as
      80       - FILENAME_MAX in <stdio.h>,
      81       - _MAX_PATH in <stdlib.h>,
      82       - MAX_PATH in <windef.h>.
      83     Undefine the original value, because mingw's <limits.h> gets it wrong.  */
      84  #  undef PATH_MAX
      85  #  define PATH_MAX 260
      86  # endif
      87  
      88  #endif /* _PATHMAX_H */