| 1 | /* System dependent declarations.
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| 2 |
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| 3 | Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1998, 2001, 2002
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| 4 | Free Software Foundation, Inc.
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| 5 |
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| 6 | This file is part of GNU DIFF.
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| 7 |
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| 8 | GNU DIFF is free software; you can redistribute it and/or modify
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| 9 | it under the terms of the GNU General Public License as published by
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| 10 | the Free Software Foundation; either version 2, or (at your option)
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| 11 | any later version.
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| 12 |
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| 13 | GNU DIFF is distributed in the hope that it will be useful,
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | GNU General Public License for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License
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| 19 | along with this program; see the file COPYING.
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| 20 | If not, write to the Free Software Foundation,
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| 21 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 22 |
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| 23 | #include <config.h>
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| 24 |
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| 25 | /* Don't bother to support K&R C compilers any more; it's not worth
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| 26 | the trouble. These macros prevent some library modules from being
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| 27 | compiled in K&R C mode. */
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| 28 | #define PARAMS(Args) Args
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| 29 | #define PROTOTYPES 1
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| 30 |
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| 31 | /* Define `__attribute__' and `volatile' first
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| 32 | so that they're used consistently in all system includes. */
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| 33 | #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6) || __STRICT_ANSI__
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| 34 | # define __attribute__(x)
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| 35 | #endif
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| 36 | #if defined const && !defined volatile
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| 37 | # define volatile
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| 38 | #endif
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| 39 |
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| 40 | /* Verify a requirement at compile-time (unlike assert, which is runtime). */
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| 41 | #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
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| 42 |
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| 43 |
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| 44 | /* Determine whether an integer type is signed, and its bounds.
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| 45 | This code assumes two's (or one's!) complement with no holes. */
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| 46 |
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| 47 | /* The extra casts work around common compiler bugs,
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| 48 | e.g. Cray C 5.0.3.0 when t == time_t. */
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| 49 | #ifndef TYPE_SIGNED
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| 50 | # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
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| 51 | #endif
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| 52 | #ifndef TYPE_MINIMUM
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| 53 | # define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
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| 54 | ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) \
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| 55 | : (t) 0))
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| 56 | #endif
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| 57 | #ifndef TYPE_MAXIMUM
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| 58 | # define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
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| 59 | #endif
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| 60 |
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| 61 | #include <sys/types.h>
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| 62 | #include <sys/stat.h>
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| 63 |
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| 64 | #if STAT_MACROS_BROKEN
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| 65 | # undef S_ISBLK
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| 66 | # undef S_ISCHR
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| 67 | # undef S_ISDIR
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| 68 | # undef S_ISFIFO
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| 69 | # undef S_ISREG
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| 70 | # undef S_ISSOCK
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| 71 | #endif
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| 72 | #ifndef S_ISDIR
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| 73 | # define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
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| 74 | #endif
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| 75 | #ifndef S_ISREG
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| 76 | # define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
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| 77 | #endif
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| 78 | #if !defined S_ISBLK && defined S_IFBLK
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| 79 | # define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
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| 80 | #endif
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| 81 | #if !defined S_ISCHR && defined S_IFCHR
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| 82 | # define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
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| 83 | #endif
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| 84 | #if !defined S_ISFIFO && defined S_IFFIFO
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| 85 | # define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFFIFO)
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| 86 | #endif
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| 87 | #if !defined S_ISSOCK && defined S_IFSOCK
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| 88 | # define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
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| 89 | #endif
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| 90 | #ifndef S_IXUSR
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| 91 | # define S_IXUSR 0100
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| 92 | #endif
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| 93 | #ifndef S_IXGRP
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| 94 | # define S_IXGRP 0010
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| 95 | #endif
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| 96 | #ifndef S_IXOTH
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| 97 | # define S_IXOTH 0001
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| 98 | #endif
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| 99 |
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| 100 | #if HAVE_UNISTD_H
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| 101 | # include <unistd.h>
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| 102 | #endif
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| 103 |
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| 104 | #ifndef SEEK_SET
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| 105 | # define SEEK_SET 0
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| 106 | #endif
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| 107 | #ifndef SEEK_CUR
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| 108 | # define SEEK_CUR 1
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| 109 | #endif
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| 110 |
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| 111 | #ifndef STDIN_FILENO
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| 112 | # define STDIN_FILENO 0
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| 113 | #endif
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| 114 | #ifndef STDOUT_FILENO
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| 115 | # define STDOUT_FILENO 1
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| 116 | #endif
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| 117 | #ifndef STDERR_FILENO
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| 118 | # define STDERR_FILENO 2
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| 119 | #endif
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| 120 |
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| 121 | #if HAVE_TIME_H
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| 122 | # include <time.h>
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| 123 | #else
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| 124 | # include <sys/time.h>
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| 125 | #endif
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| 126 |
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| 127 | #if HAVE_FCNTL_H
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| 128 | # include <fcntl.h>
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| 129 | #else
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| 130 | # if HAVE_SYS_FILE_H
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| 131 | # include <sys/file.h>
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| 132 | # endif
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| 133 | #endif
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| 134 |
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| 135 | #if !HAVE_DUP2
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| 136 | # define dup2(f, t) (close (t), fcntl (f, F_DUPFD, t))
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| 137 | #endif
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| 138 |
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| 139 | #ifndef O_RDONLY
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| 140 | # define O_RDONLY 0
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| 141 | #endif
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| 142 | #ifndef O_RDWR
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| 143 | # define O_RDWR 2
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| 144 | #endif
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| 145 | #ifndef S_IRUSR
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| 146 | # define S_IRUSR 0400
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| 147 | #endif
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| 148 | #ifndef S_IWUSR
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| 149 | # define S_IWUSR 0200
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| 150 | #endif
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| 151 |
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| 152 | #if HAVE_SYS_WAIT_H
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| 153 | # include <sys/wait.h>
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| 154 | #endif
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| 155 | #ifndef WEXITSTATUS
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| 156 | # define WEXITSTATUS(stat_val) ((unsigned int) (stat_val) >> 8)
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| 157 | #endif
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| 158 | #ifndef WIFEXITED
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| 159 | # define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
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| 160 | #endif
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| 161 |
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| 162 | #ifndef STAT_BLOCKSIZE
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| 163 | # if HAVE_STRUCT_STAT_ST_BLKSIZE
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| 164 | # define STAT_BLOCKSIZE(s) ((s).st_blksize)
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| 165 | # else
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| 166 | # define STAT_BLOCKSIZE(s) (8 * 1024)
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| 167 | # endif
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| 168 | #endif
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| 169 |
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| 170 | #if HAVE_DIRENT_H
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| 171 | # include <dirent.h>
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| 172 | # define NAMLEN(dirent) strlen ((dirent)->d_name)
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| 173 | #else
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| 174 | # define dirent direct
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| 175 | # define NAMLEN(dirent) ((dirent)->d_namlen)
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| 176 | # if HAVE_SYS_NDIR_H
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| 177 | # include <sys/ndir.h>
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| 178 | # endif
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| 179 | # if HAVE_SYS_DIR_H
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| 180 | # include <sys/dir.h>
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| 181 | # endif
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| 182 | # if HAVE_NDIR_H
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| 183 | # include <ndir.h>
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| 184 | # endif
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| 185 | #endif
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| 186 |
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| 187 | #if HAVE_STDLIB_H
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| 188 | # include <stdlib.h>
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| 189 | #else
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| 190 | # ifndef getenv
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| 191 | char *getenv ();
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| 192 | # endif
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| 193 | #endif
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| 194 | #ifndef EXIT_SUCCESS
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| 195 | # define EXIT_SUCCESS 0
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| 196 | #endif
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| 197 | #if !EXIT_FAILURE
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| 198 | # undef EXIT_FAILURE /* Sony NEWS-OS 4.0C defines EXIT_FAILURE to 0. */
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| 199 | # define EXIT_FAILURE 1
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| 200 | #endif
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| 201 | #define EXIT_TROUBLE 2
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| 202 |
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| 203 | #include <limits.h>
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| 204 | #ifndef SSIZE_MAX
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| 205 | # define SSIZE_MAX TYPE_MAXIMUM (ssize_t)
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| 206 | #endif
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| 207 |
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| 208 | #if HAVE_INTTYPES_H
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| 209 | # include <inttypes.h>
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| 210 | #endif
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| 211 | #ifndef PTRDIFF_MAX
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| 212 | # define PTRDIFF_MAX TYPE_MAXIMUM (ptrdiff_t)
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| 213 | #endif
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| 214 | #ifndef SIZE_MAX
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| 215 | # define SIZE_MAX TYPE_MAXIMUM (size_t)
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| 216 | #endif
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| 217 | #ifndef UINTMAX_MAX
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| 218 | # define UINTMAX_MAX TYPE_MAXIMUM (uintmax_t)
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| 219 | #endif
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| 220 | #if ! HAVE_STRTOUMAX && ! defined strtoumax
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| 221 | uintmax_t strtoumax (char const *, char **, int);
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| 222 | #endif
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| 223 |
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| 224 | #include <stddef.h>
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| 225 |
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| 226 | #if STDC_HEADERS || HAVE_STRING_H
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| 227 | # include <string.h>
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| 228 | #else
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| 229 | # if !HAVE_STRCHR
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| 230 | # define strchr index
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| 231 | # define strrchr rindex
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| 232 | # endif
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| 233 | char *strchr (), *strrchr ();
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| 234 | # if !HAVE_MEMCHR
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| 235 | # define memcmp(s1, s2, n) bcmp (s1, s2, n)
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| 236 | # define memcpy(d, s, n) bcopy (s, d, n)
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| 237 | void *memchr ();
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| 238 | # endif
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| 239 | #endif
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| 240 |
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| 241 | #if HAVE_LOCALE_H
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| 242 | # include <locale.h>
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| 243 | #else
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| 244 | # define setlocale(category, locale)
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| 245 | #endif
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| 246 |
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| 247 | #include <gettext.h>
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| 248 |
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| 249 | #define _(msgid) gettext (msgid)
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| 250 | #define N_(msgid) msgid
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| 251 |
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| 252 | #include <ctype.h>
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| 253 |
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| 254 | /* CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
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| 255 | as an argument to <ctype.h> macros like `isspace'. */
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| 256 | #if STDC_HEADERS
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| 257 | # define CTYPE_DOMAIN(c) 1
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| 258 | #else
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| 259 | # define CTYPE_DOMAIN(c) ((unsigned int) (c) <= 0177)
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| 260 | #endif
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| 261 | #define ISPRINT(c) (CTYPE_DOMAIN (c) && isprint (c))
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| 262 | #define ISSPACE(c) (CTYPE_DOMAIN (c) && isspace (c))
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| 263 |
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| 264 | #if STDC_HEADERS
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| 265 | # define TOLOWER(c) tolower (c)
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| 266 | #else
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| 267 | # ifndef _tolower
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| 268 | # define _tolower(c) tolower (c)
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| 269 | # endif
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| 270 | # define TOLOWER(c) (CTYPE_DOMAIN (c) && isupper (c) ? _tolower (c) : (c))
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| 271 | #endif
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| 272 |
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| 273 | /* ISDIGIT differs from isdigit, as follows:
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| 274 | - Its arg may be any int or unsigned int; it need not be an unsigned char.
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| 275 | - It's guaranteed to evaluate its argument exactly once.
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| 276 | - It's typically faster.
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| 277 | POSIX 1003.1-2001 says that only '0' through '9' are digits.
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| 278 | Prefer ISDIGIT to isdigit unless it's important to use the locale's
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| 279 | definition of `digit' even when the host does not conform to POSIX. */
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| 280 | #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
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| 281 |
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| 282 | #include <errno.h>
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| 283 | #if !STDC_HEADERS
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| 284 | extern int errno;
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| 285 | #endif
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| 286 |
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| 287 | #include <signal.h>
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| 288 | #ifndef SA_RESTART
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| 289 | # ifdef SA_INTERRUPT /* e.g. SunOS 4.1.x */
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| 290 | # define SA_RESTART SA_INTERRUPT
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| 291 | # else
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| 292 | # define SA_RESTART 0
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| 293 | # endif
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| 294 | #endif
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| 295 | #if !defined SIGCHLD && defined SIGCLD
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| 296 | # define SIGCHLD SIGCLD
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| 297 | #endif
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| 298 |
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| 299 | #undef MIN
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| 300 | #undef MAX
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| 301 | #define MIN(a, b) ((a) <= (b) ? (a) : (b))
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| 302 | #define MAX(a, b) ((a) >= (b) ? (a) : (b))
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| 303 |
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| 304 | #if HAVE_STDBOOL_H
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| 305 | # include <stdbool.h>
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| 306 | #else
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| 307 | # define bool unsigned char
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| 308 | #endif
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| 309 |
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| 310 | #if HAVE_VFORK_H
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| 311 | # include <vfork.h>
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| 312 | #endif
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| 313 |
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| 314 | #if ! HAVE_WORKING_VFORK
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| 315 | # define vfork fork
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| 316 | #endif
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| 317 | |
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| 318 |
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| 319 | /* Type used for fast comparison of several bytes at a time. */
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| 320 |
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| 321 | #ifndef word
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| 322 | # define word uintmax_t
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| 323 | #endif
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| 324 |
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| 325 | /* The integer type of a line number. Since files are read into main
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| 326 | memory, ptrdiff_t should be wide enough. */
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| 327 |
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| 328 | typedef ptrdiff_t lin;
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| 329 | #define LIN_MAX PTRDIFF_MAX
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| 330 | verify (lin_is_signed, TYPE_SIGNED (lin));
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| 331 | verify (lin_is_wide_enough, sizeof (ptrdiff_t) <= sizeof (lin));
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| 332 | verify (lin_is_printable_as_long, sizeof (lin) <= sizeof (long));
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| 333 | |
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| 334 |
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| 335 | /* This section contains POSIX-compliant defaults for macros
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| 336 | that are meant to be overridden by hand in config.h as needed. */
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| 337 |
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| 338 | #ifndef file_name_cmp
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| 339 | # define file_name_cmp strcmp
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| 340 | #endif
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| 341 |
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| 342 | #ifndef initialize_main
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| 343 | # define initialize_main(argcp, argvp)
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| 344 | #endif
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| 345 |
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| 346 | #ifndef NULL_DEVICE
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| 347 | # define NULL_DEVICE "/dev/null"
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| 348 | #endif
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| 349 |
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| 350 | /* Do struct stat *S, *T describe the same special file? */
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| 351 | #ifndef same_special_file
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| 352 | # if HAVE_ST_RDEV && defined S_ISBLK && defined S_ISCHR
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| 353 | # define same_special_file(s, t) \
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| 354 | (((S_ISBLK ((s)->st_mode) && S_ISBLK ((t)->st_mode)) \
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| 355 | || (S_ISCHR ((s)->st_mode) && S_ISCHR ((t)->st_mode))) \
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| 356 | && (s)->st_rdev == (t)->st_rdev)
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| 357 | # else
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| 358 | # define same_special_file(s, t) 0
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| 359 | # endif
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| 360 | #endif
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| 361 |
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| 362 | /* Do struct stat *S, *T describe the same file? Answer -1 if unknown. */
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| 363 | #ifndef same_file
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| 364 | # define same_file(s, t) \
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| 365 | ((((s)->st_ino == (t)->st_ino) && ((s)->st_dev == (t)->st_dev)) \
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| 366 | || same_special_file (s, t))
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| 367 | #endif
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| 368 |
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| 369 | /* Do struct stat *S, *T have the same file attributes?
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| 370 |
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| 371 | POSIX says that two files are identical if st_ino and st_dev are
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| 372 | the same, but many filesystems incorrectly assign the same (device,
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| 373 | inode) pair to two distinct files, including:
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| 374 |
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| 375 | - GNU/Linux NFS servers that export all local filesystems as a
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| 376 | single NFS filesystem, if a local device number (st_dev) exceeds
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| 377 | 255, or if a local inode number (st_ino) exceeds 16777215.
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| 378 |
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| 379 | - Network Appliance NFS servers in snapshot directories; see
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| 380 | Network Appliance bug #195.
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| 381 |
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| 382 | - ClearCase MVFS; see bug id ATRia04618.
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| 383 |
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| 384 | Check whether two files that purport to be the same have the same
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| 385 | attributes, to work around instances of this common bug. Do not
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| 386 | inspect all attributes, only attributes useful in checking for this
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| 387 | bug.
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| 388 |
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| 389 | It's possible for two distinct files on a buggy filesystem to have
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| 390 | the same attributes, but it's not worth slowing down all
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| 391 | implementations (or complicating the configuration) to cater to
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| 392 | these rare cases in buggy implementations. */
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| 393 |
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| 394 | #ifndef same_file_attributes
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| 395 | # define same_file_attributes(s, t) \
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| 396 | ((s)->st_mode == (t)->st_mode \
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| 397 | && (s)->st_nlink == (t)->st_nlink \
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| 398 | && (s)->st_uid == (t)->st_uid \
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| 399 | && (s)->st_gid == (t)->st_gid \
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| 400 | && (s)->st_size == (t)->st_size \
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| 401 | && (s)->st_mtime == (t)->st_mtime \
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| 402 | && (s)->st_ctime == (t)->st_ctime)
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| 403 | #endif
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