| 1 | /* Define PATH_MAX somehow. Requires sys/types.h.
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| 2 | Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2022 Free Software
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| 3 | Foundation, Inc.
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| 4 |
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| 5 | This file is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU Lesser General Public License as
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| 7 | published by the Free Software Foundation; either version 2.1 of the
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| 8 | License, or (at your option) any later version.
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| 9 |
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| 10 | This file is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU Lesser General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU Lesser General Public License
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| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | #ifndef _PATHMAX_H
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| 19 | # define _PATHMAX_H
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| 20 |
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| 21 | /* POSIX:2008 defines PATH_MAX to be the maximum number of bytes in a filename,
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| 22 | including the terminating NUL byte.
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| 23 | <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html>
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| 24 | PATH_MAX is not defined on systems which have no limit on filename length,
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| 25 | such as GNU/Hurd.
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| 26 |
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| 27 | This file does *not* define PATH_MAX always. Programs that use this file
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| 28 | can handle the GNU/Hurd case in several ways:
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| 29 | - Either with a package-wide handling, or with a per-file handling,
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| 30 | - Either through a
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| 31 | #ifdef PATH_MAX
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| 32 | or through a fallback like
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| 33 | #ifndef PATH_MAX
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| 34 | # define PATH_MAX 8192
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| 35 | #endif
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| 36 | or through a fallback like
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| 37 | #ifndef PATH_MAX
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| 38 | # define PATH_MAX pathconf ("/", _PC_PATH_MAX)
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| 39 | #endif
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| 40 | */
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| 41 |
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| 42 | # include <unistd.h>
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| 43 |
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| 44 | # include <limits.h>
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| 45 |
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| 46 | # ifndef _POSIX_PATH_MAX
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| 47 | # define _POSIX_PATH_MAX 256
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| 48 | # endif
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| 49 |
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| 50 | /* Don't include sys/param.h if it already has been. */
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| 51 | # if defined HAVE_SYS_PARAM_H && !defined PATH_MAX && !defined MAXPATHLEN
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| 52 | # include <sys/param.h>
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| 53 | # endif
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| 54 |
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| 55 | # if !defined PATH_MAX && defined MAXPATHLEN
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| 56 | # define PATH_MAX MAXPATHLEN
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| 57 | # endif
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| 58 |
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| 59 | # ifdef __hpux
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| 60 | /* On HP-UX, PATH_MAX designates the maximum number of bytes in a filename,
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| 61 | *not* including the terminating NUL byte, and is set to 1023.
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| 62 | Additionally, when _XOPEN_SOURCE is defined to 500 or more, PATH_MAX is
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| 63 | not defined at all any more. */
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| 64 | # undef PATH_MAX
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| 65 | # define PATH_MAX 1024
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| 66 | # endif
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| 67 |
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| 68 | # if defined _WIN32 && ! defined __CYGWIN__
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| 69 | /* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com,
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| 70 | section "Maximum Path Length Limitation",
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| 71 | <https://docs.microsoft.com/en-us/windows/desktop/FileIO/naming-a-file#maximum-path-length-limitation>
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| 72 | explains that the maximum size of a filename, including the terminating
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| 73 | NUL byte, is 260 = 3 + 256 + 1.
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| 74 | This is the same value as
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| 75 | - FILENAME_MAX in <stdio.h>,
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| 76 | - _MAX_PATH in <stdlib.h>,
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| 77 | - MAX_PATH in <windef.h>.
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| 78 | Undefine the original value, because mingw's <limits.h> gets it wrong. */
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| 79 | # undef PATH_MAX
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| 80 | # define PATH_MAX 260
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| 81 | # endif
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| 82 |
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| 83 | #endif /* _PATHMAX_H */
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