1 /* System dependent declarations.
3 Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1998, 2001, 2002,
4 2004 Free Software Foundation, Inc.
6 This file is part of GNU DIFF.
8 GNU DIFF is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU DIFF is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; see the file COPYING.
20 If not, write to the Free Software Foundation,
21 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 /* Don't bother to support K&R C compilers any more; it's not worth
26 the trouble. These macros prevent some library modules from being
27 compiled in K&R C mode. */
28 #define PARAMS(Args) Args
31 /* Define `__attribute__' and `volatile' first
32 so that they're used consistently in all system includes. */
33 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6) || __STRICT_ANSI__
34 # define __attribute__(x)
36 #if defined const && !defined volatile
40 /* Verify a requirement at compile-time (unlike assert, which is runtime). */
41 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
44 /* Determine whether an integer type is signed, and its bounds.
45 This code assumes two's (or one's!) complement with no holes. */
47 /* The extra casts work around common compiler bugs,
48 e.g. Cray C 5.0.3.0 when t == time_t. */
50 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
53 # define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
54 ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) \
58 # define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
61 #include <sys/types.h>
86 # define STDIN_FILENO 0
89 # define STDOUT_FILENO 1
92 # define STDERR_FILENO 2
101 # include <sys/file.h>
106 # define dup2(f, t) (close (t), fcntl (f, F_DUPFD, t))
116 # define S_IRUSR 0400
119 # define S_IWUSR 0200
123 # include <sys/wait.h>
126 # define WEXITSTATUS(stat_val) ((unsigned int) (stat_val) >> 8)
129 # define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
132 #ifndef STAT_BLOCKSIZE
133 # if HAVE_STRUCT_STAT_ST_BLKSIZE
134 # define STAT_BLOCKSIZE(s) ((s).st_blksize)
136 # define STAT_BLOCKSIZE(s) (8 * 1024)
142 # define NAMLEN(dirent) strlen ((dirent)->d_name)
144 # define dirent direct
145 # define NAMLEN(dirent) ((dirent)->d_namlen)
147 # include <sys/ndir.h>
150 # include <sys/dir.h>
158 #define EXIT_TROUBLE 2
163 # include <inttypes.h>
166 # define PTRDIFF_MAX TYPE_MAXIMUM (ptrdiff_t)
169 # define SIZE_MAX TYPE_MAXIMUM (size_t)
172 # define UINTMAX_MAX TYPE_MAXIMUM (uintmax_t)
174 #if ! HAVE_STRTOUMAX && ! defined strtoumax
175 uintmax_t strtoumax (char const *, char **, int);
181 #if ! HAVE_STRCASECOLL
182 # if HAVE_STRICOLL || defined stricoll
183 # define strcasecoll(a, b) stricoll (a, b)
185 # define strcasecoll(a, b) strcasecmp (a, b) /* best we can do */
188 #if ! (HAVE_STRCASECMP || defined strcasecmp)
189 int strcasecmp (char const *, char const *);
195 # define setlocale(category, locale)
200 #define _(msgid) gettext (msgid)
201 #define N_(msgid) msgid
205 /* ISDIGIT differs from isdigit, as follows:
206 - Its arg may be any int or unsigned int; it need not be an unsigned char.
207 - It's guaranteed to evaluate its argument exactly once.
208 - It's typically faster.
209 POSIX 1003.1-2001 says that only '0' through '9' are digits.
210 Prefer ISDIGIT to isdigit unless it's important to use the locale's
211 definition of `digit' even when the host does not conform to POSIX. */
212 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
218 # ifdef SA_INTERRUPT /* e.g. SunOS 4.1.x */
219 # define SA_RESTART SA_INTERRUPT
221 # define SA_RESTART 0
224 #if !defined SIGCHLD && defined SIGCLD
225 # define SIGCHLD SIGCLD
230 #define MIN(a, b) ((a) <= (b) ? (a) : (b))
231 #define MAX(a, b) ((a) >= (b) ? (a) : (b))
239 #if ! HAVE_WORKING_VFORK
243 /* Type used for fast comparison of several bytes at a time. */
246 # define word uintmax_t
249 /* The integer type of a line number. Since files are read into main
250 memory, ptrdiff_t should be wide enough. */
252 typedef ptrdiff_t lin;
253 #define LIN_MAX PTRDIFF_MAX
254 verify (lin_is_signed, TYPE_SIGNED (lin));
255 verify (lin_is_wide_enough, sizeof (ptrdiff_t) <= sizeof (lin));
256 verify (lin_is_printable_as_long_int, sizeof (lin) <= sizeof (long int));
258 /* This section contains POSIX-compliant defaults for macros
259 that are meant to be overridden by hand in config.h as needed. */
261 #ifndef file_name_cmp
262 # define file_name_cmp strcmp
265 #ifndef initialize_main
266 # define initialize_main(argcp, argvp)
270 # define NULL_DEVICE "/dev/null"
273 /* Do struct stat *S, *T describe the same special file? */
274 #ifndef same_special_file
275 # if HAVE_ST_RDEV && defined S_ISBLK && defined S_ISCHR
276 # define same_special_file(s, t) \
277 (((S_ISBLK ((s)->st_mode) && S_ISBLK ((t)->st_mode)) \
278 || (S_ISCHR ((s)->st_mode) && S_ISCHR ((t)->st_mode))) \
279 && (s)->st_rdev == (t)->st_rdev)
281 # define same_special_file(s, t) 0
285 /* Do struct stat *S, *T describe the same file? Answer -1 if unknown. */
287 # define same_file(s, t) \
288 ((((s)->st_ino == (t)->st_ino) && ((s)->st_dev == (t)->st_dev)) \
289 || same_special_file (s, t))
292 /* Do struct stat *S, *T have the same file attributes?
294 POSIX says that two files are identical if st_ino and st_dev are
295 the same, but many filesystems incorrectly assign the same (device,
296 inode) pair to two distinct files, including:
298 - GNU/Linux NFS servers that export all local filesystems as a
299 single NFS filesystem, if a local device number (st_dev) exceeds
300 255, or if a local inode number (st_ino) exceeds 16777215.
302 - Network Appliance NFS servers in snapshot directories; see
303 Network Appliance bug #195.
305 - ClearCase MVFS; see bug id ATRia04618.
307 Check whether two files that purport to be the same have the same
308 attributes, to work around instances of this common bug. Do not
309 inspect all attributes, only attributes useful in checking for this
312 It's possible for two distinct files on a buggy filesystem to have
313 the same attributes, but it's not worth slowing down all
314 implementations (or complicating the configuration) to cater to
315 these rare cases in buggy implementations. */
317 #ifndef same_file_attributes
318 # define same_file_attributes(s, t) \
319 ((s)->st_mode == (t)->st_mode \
320 && (s)->st_nlink == (t)->st_nlink \
321 && (s)->st_uid == (t)->st_uid \
322 && (s)->st_gid == (t)->st_gid \
323 && (s)->st_size == (t)->st_size \
324 && (s)->st_mtime == (t)->st_mtime \
325 && (s)->st_ctime == (t)->st_ctime)