84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
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/* Define PATH_MAX somehow. Requires sys/types.h.
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Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2021 Free Software
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Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>. */
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#ifndef _PATHMAX_H
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# define _PATHMAX_H
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/* POSIX:2008 defines PATH_MAX to be the maximum number of bytes in a filename,
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including the terminating NUL byte.
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<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html>
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PATH_MAX is not defined on systems which have no limit on filename length,
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such as GNU/Hurd.
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This file does *not* define PATH_MAX always. Programs that use this file
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can handle the GNU/Hurd case in several ways:
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- Either with a package-wide handling, or with a per-file handling,
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- Either through a
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#ifdef PATH_MAX
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or through a fallback like
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#ifndef PATH_MAX
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# define PATH_MAX 8192
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#endif
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or through a fallback like
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#ifndef PATH_MAX
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# define PATH_MAX pathconf ("/", _PC_PATH_MAX)
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#endif
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*/
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# include <unistd.h>
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# include <limits.h>
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# ifndef _POSIX_PATH_MAX
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# define _POSIX_PATH_MAX 256
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# endif
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/* Don't include sys/param.h if it already has been. */
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# if defined HAVE_SYS_PARAM_H && !defined PATH_MAX && !defined MAXPATHLEN
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# include <sys/param.h>
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# endif
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# if !defined PATH_MAX && defined MAXPATHLEN
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# define PATH_MAX MAXPATHLEN
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# endif
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# ifdef __hpux
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/* On HP-UX, PATH_MAX designates the maximum number of bytes in a filename,
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*not* including the terminating NUL byte, and is set to 1023.
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Additionally, when _XOPEN_SOURCE is defined to 500 or more, PATH_MAX is
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not defined at all any more. */
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# undef PATH_MAX
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# define PATH_MAX 1024
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# endif
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# if defined _WIN32 && ! defined __CYGWIN__
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/* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com,
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section "Maximum Path Length Limitation",
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<https://docs.microsoft.com/en-us/windows/desktop/FileIO/naming-a-file#maximum-path-length-limitation>
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explains that the maximum size of a filename, including the terminating
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NUL byte, is 260 = 3 + 256 + 1.
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This is the same value as
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- FILENAME_MAX in <stdio.h>,
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- _MAX_PATH in <stdlib.h>,
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- MAX_PATH in <windef.h>.
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Undefine the original value, because mingw's <limits.h> gets it wrong. */
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# undef PATH_MAX
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# define PATH_MAX 260
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# endif
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#endif /* _PATHMAX_H */
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