1 /* Define PATH_MAX somehow.  Requires sys/types.h.
2    Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2012 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 <http://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    <http://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 __WIN32__) && ! defined __CYGWIN__
69 /* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com,
70    section "Maximum Path Length Limitation",
71    <http://msdn.microsoft.com/en-us/library/aa365247(v=vs.85).aspx#maxpath>
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 */
84