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38ec2207 | 1 | /* Define PATH_MAX somehow. Requires sys/types.h. |
9c9d63b1 | 2 | Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2021 Free Software |
38ec2207 PA |
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 | |
c0c3707f | 16 | along with this program; if not, see <https://www.gnu.org/licenses/>. */ |
38ec2207 PA |
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. | |
c0c3707f | 23 | <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html> |
38ec2207 PA |
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 | ||
c0c3707f | 68 | # if defined _WIN32 && ! defined __CYGWIN__ |
38ec2207 PA |
69 | /* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com, |
70 | section "Maximum Path Length Limitation", | |
c0c3707f | 71 | <https://docs.microsoft.com/en-us/windows/desktop/FileIO/naming-a-file#maximum-path-length-limitation> |
38ec2207 PA |
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 */ |