diff options
Diffstat (limited to 'lib/pathmax.h')
| -rw-r--r-- | lib/pathmax.h | 58 |
1 files changed, 47 insertions, 11 deletions
diff --git a/lib/pathmax.h b/lib/pathmax.h index 6941e45..aee22f8 100644 --- a/lib/pathmax.h +++ b/lib/pathmax.h @@ -1,9 +1,10 @@ /* Define PATH_MAX somehow. Requires sys/types.h. - Copyright (C) 1992, 1999, 2001, 2003, 2005 Free Software Foundation, Inc. + Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2016 Free Software + Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) + the Free Software Foundation; either version 3, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -12,12 +13,32 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + along with this program; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _PATHMAX_H # define _PATHMAX_H +/* POSIX:2008 defines PATH_MAX to be the maximum number of bytes in a filename, + including the terminating NUL byte. + <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html> + PATH_MAX is not defined on systems which have no limit on filename length, + such as GNU/Hurd. + + This file does *not* define PATH_MAX always. Programs that use this file + can handle the GNU/Hurd case in several ways: + - Either with a package-wide handling, or with a per-file handling, + - Either through a + #ifdef PATH_MAX + or through a fallback like + #ifndef PATH_MAX + # define PATH_MAX 8192 + #endif + or through a fallback like + #ifndef PATH_MAX + # define PATH_MAX pathconf ("/", _PC_PATH_MAX) + #endif + */ + # include <unistd.h> # include <limits.h> @@ -26,11 +47,6 @@ # define _POSIX_PATH_MAX 256 # endif -# if !defined PATH_MAX && defined _PC_PATH_MAX -# define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 \ - : pathconf ("/", _PC_PATH_MAX)) -# endif - /* Don't include sys/param.h if it already has been. */ # if defined HAVE_SYS_PARAM_H && !defined PATH_MAX && !defined MAXPATHLEN # include <sys/param.h> @@ -40,8 +56,28 @@ # define PATH_MAX MAXPATHLEN # endif -# ifndef PATH_MAX -# define PATH_MAX _POSIX_PATH_MAX +# ifdef __hpux +/* On HP-UX, PATH_MAX designates the maximum number of bytes in a filename, + *not* including the terminating NUL byte, and is set to 1023. + Additionally, when _XOPEN_SOURCE is defined to 500 or more, PATH_MAX is + not defined at all any more. */ +# undef PATH_MAX +# define PATH_MAX 1024 +# endif + +# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ +/* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com, + section "Maximum Path Length Limitation", + <http://msdn.microsoft.com/en-us/library/aa365247(v=vs.85).aspx#maxpath> + explains that the maximum size of a filename, including the terminating + NUL byte, is 260 = 3 + 256 + 1. + This is the same value as + - FILENAME_MAX in <stdio.h>, + - _MAX_PATH in <stdlib.h>, + - MAX_PATH in <windef.h>. + Undefine the original value, because mingw's <limits.h> gets it wrong. */ +# undef PATH_MAX +# define PATH_MAX 260 # endif #endif /* _PATHMAX_H */ |