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annotate lib/pathmax.h @ 18070:d460ec17f09f

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author Karl Berry <karl@freefriends.org>
date Tue, 28 Jul 2015 13:57:32 -0700 (2015-07-28)
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1 /* Define PATH_MAX somehow. Requires sys/types.h.
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2 Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2015 Free Software
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3 Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program 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 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 General Public License
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16 along with this program; if not, see <http://www.gnu.org/licenses/>. */
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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 <http://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 __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 <http://msdn.microsoft.com/en-us/library/aa365247(v=vs.85).aspx#maxpath>
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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 */