1 /* System dependent declarations.
3 Copyright (C) 1988-1989, 1992-1995, 1998, 2001-2002, 2004, 2006, 2009-2013,
4 2015-2021 Free Software Foundation, Inc.
6 This file is part of GNU DIFF.
8 This program 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 3 of the License, or
11 (at your option) any later version.
13 This program 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. If not, see <http://www.gnu.org/licenses/>. */
23 /* Use this to suppress gcc's "...may be used before initialized" warnings. */
25 # define IF_LINT(Code) Code
27 # define IF_LINT(Code) /* empty */
30 /* Define '__attribute__' and 'volatile' first
31 so that they're used consistently in all system includes. */
32 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6) || __STRICT_ANSI__
33 # define __attribute__(x)
38 #include <sys/types.h>
41 #include "stat-macros.h"
43 #ifndef STAT_BLOCKSIZE
44 # if HAVE_STRUCT_STAT_ST_BLKSIZE
45 # define STAT_BLOCKSIZE(s) ((s).st_blksize)
47 # define STAT_BLOCKSIZE(s) (8 * 1024)
59 #ifndef _D_EXACT_NAMLEN
60 # define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
64 #define EXIT_TROUBLE 2
72 #if ! HAVE_STRCASECOLL
73 # if HAVE_STRICOLL || defined stricoll
74 # define strcasecoll(a, b) stricoll (a, b)
76 # define strcasecoll(a, b) strcasecmp (a, b) /* best we can do */
79 #if ! (HAVE_STRCASECMP || defined strcasecmp)
80 int strcasecmp (char const *, char const *);
86 # define textdomain(Domainname) /* empty */
87 # undef bindtextdomain
88 # define bindtextdomain(Domainname, Dirname) /* empty */
91 #define _(msgid) gettext (msgid)
92 #define N_(msgid) msgid
96 /* ISDIGIT differs from isdigit, as follows:
97 - Its arg may be any int or unsigned int; it need not be an unsigned char.
98 - It's guaranteed to evaluate its argument exactly once.
99 - It's typically faster.
100 POSIX 1003.1-2001 says that only '0' through '9' are digits.
101 Prefer ISDIGIT to isdigit unless it's important to use the locale's
102 definition of 'digit' even when the host does not conform to POSIX. */
103 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
108 #if !defined SIGCHLD && defined SIGCLD
109 # define SIGCHLD SIGCLD
114 #define MIN(a, b) ((a) <= (b) ? (a) : (b))
115 #define MAX(a, b) ((a) >= (b) ? (a) : (b))
118 #include <intprops.h>
119 #include "propername.h"
122 /* Type used for fast comparison of several bytes at a time.
123 This used to be uintmax_t, but changing it to size_t
124 made plain 'cmp' 90% faster (GCC 4.8.1, x86). */
130 /* The signed integer type of a line number. Since files are read
131 into main memory, ptrdiff_t should be wide enough. */
133 typedef ptrdiff_t lin;
134 #define LIN_MAX PTRDIFF_MAX
136 /* The signed integer type for printing line numbers, and its printf
137 length modifier. This is not simply ptrdiff_t, to cater to older
138 and/or nonstandard C libraries where "l" works but "ll" and "t" do
139 not, or where 'long' is too narrow and "ll" works but "t" does not. */
141 #if LIN_MAX <= LONG_MAX
142 typedef long int printint;
144 #elif LIN_MAX <= LLONG_MAX
145 typedef long long int printint;
148 typedef ptrdiff_t printint;
152 verify (TYPE_SIGNED (lin));
153 verify (TYPE_SIGNED (printint));
154 verify (LIN_MAX == TYPE_MAXIMUM (lin));
155 verify (LIN_MAX <= TYPE_MAXIMUM (printint));
157 /* Limit so that 2 * CONTEXT + 1 does not overflow. */
159 #define CONTEXT_MAX ((LIN_MAX - 1) / 2)
162 /* This section contains POSIX-compliant defaults for macros
163 that are meant to be overridden by hand in config.h as needed. */
165 #ifndef file_name_cmp
166 # define file_name_cmp strcmp
169 #ifndef initialize_main
170 # define initialize_main(argcp, argvp)
174 # define NULL_DEVICE "/dev/null"
177 /* Do struct stat *S, *T describe the same special file? */
178 #ifndef same_special_file
179 # if HAVE_STRUCT_STAT_ST_RDEV && defined S_ISBLK && defined S_ISCHR
180 # define same_special_file(s, t) \
181 (((S_ISBLK ((s)->st_mode) && S_ISBLK ((t)->st_mode)) \
182 || (S_ISCHR ((s)->st_mode) && S_ISCHR ((t)->st_mode))) \
183 && (s)->st_rdev == (t)->st_rdev)
185 # define same_special_file(s, t) 0
189 /* Do struct stat *S, *T describe the same file? Answer -1 if unknown. */
191 # define same_file(s, t) \
192 ((((s)->st_ino == (t)->st_ino) && ((s)->st_dev == (t)->st_dev)) \
193 || same_special_file (s, t))
196 /* Do struct stat *S, *T have the same file attributes?
198 POSIX says that two files are identical if st_ino and st_dev are
199 the same, but many file systems incorrectly assign the same (device,
200 inode) pair to two distinct files, including:
202 - GNU/Linux NFS servers that export all local file systems as a
203 single NFS file system, if a local device number (st_dev) exceeds
204 255, or if a local inode number (st_ino) exceeds 16777215.
206 - Network Appliance NFS servers in snapshot directories; see
207 Network Appliance bug #195.
209 - ClearCase MVFS; see bug id ATRia04618.
211 Check whether two files that purport to be the same have the same
212 attributes, to work around instances of this common bug. Do not
213 inspect all attributes, only attributes useful in checking for this
216 It's possible for two distinct files on a buggy file system to have
217 the same attributes, but it's not worth slowing down all
218 implementations (or complicating the configuration) to cater to
219 these rare cases in buggy implementations. */
221 #ifndef same_file_attributes
222 # define same_file_attributes(s, t) \
223 ((s)->st_mode == (t)->st_mode \
224 && (s)->st_nlink == (t)->st_nlink \
225 && (s)->st_uid == (t)->st_uid \
226 && (s)->st_gid == (t)->st_gid \
227 && (s)->st_size == (t)->st_size \
228 && (s)->st_mtime == (t)->st_mtime \
229 && (s)->st_ctime == (t)->st_ctime)
232 #define STREQ(a, b) (strcmp (a, b) == 0)
236 # define FALLTHROUGH ((void) 0)
238 # define FALLTHROUGH __attribute__ ((__fallthrough__))