1 /* System dependent declarations. 2 3 Copyright (C) 1988-1989, 1992-1995, 1998, 2001-2002, 2004, 2006, 2009-2013 4 Free Software Foundation, Inc. 5 6 This file is part of GNU DIFF. 7 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. 12 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. 17 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/>. */ 20 21 #include <config.h> 22 23 /* Use this to suppress gcc's "...may be used before initialized" warnings. */ 24 #ifdef lint 25 # define IF_LINT(Code) Code 26 #else 27 # define IF_LINT(Code) /* empty */ 28 #endif 29 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) 34 #endif 35 36 #include <verify.h> 37 38 #include <sys/types.h> 39 40 #include <sys/stat.h> 41 #include "stat-macros.h" 42 43 #ifndef STAT_BLOCKSIZE 44 # if HAVE_STRUCT_STAT_ST_BLKSIZE 45 # define STAT_BLOCKSIZE(s) ((s).st_blksize) 46 # else 47 # define STAT_BLOCKSIZE(s) (8 * 1024) 48 # endif 49 #endif 50 51 #include <unistd.h> 52 53 #include <fcntl.h> 54 #include <time.h> 55 56 #include <sys/wait.h> 57 58 #include <dirent.h> 59 #ifndef _D_EXACT_NAMLEN 60 # define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name) 61 #endif 62 63 #include <stdlib.h> 64 #define EXIT_TROUBLE 2 65 66 #include <limits.h> 67 #include <locale.h> 68 #include <stddef.h> 69 #include <inttypes.h> 70 71 #include <string.h> 72 #if ! HAVE_STRCASECOLL 73 # if HAVE_STRICOLL || defined stricoll 74 # define strcasecoll(a, b) stricoll (a, b) 75 # else 76 # define strcasecoll(a, b) strcasecmp (a, b) /* best we can do */ 77 # endif 78 #endif 79 #if ! (HAVE_STRCASECMP || defined strcasecmp) 80 int strcasecmp (char const *, char const *); 81 #endif 82 83 #include <gettext.h> 84 #if ! ENABLE_NLS 85 # undef textdomain 86 # define textdomain(Domainname) /* empty */ 87 # undef bindtextdomain 88 # define bindtextdomain(Domainname, Dirname) /* empty */ 89 #endif 90 91 #define _(msgid) gettext (msgid) 92 #define N_(msgid) msgid 93 94 #include <ctype.h> 95 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) 104 105 #include <errno.h> 106 107 #include <signal.h> 108 #if !defined SIGCHLD && defined SIGCLD 109 # define SIGCHLD SIGCLD 110 #endif 111 112 #undef MIN 113 #undef MAX 114 #define MIN(a, b) ((a) <= (b) ? (a) : (b)) 115 #define MAX(a, b) ((a) >= (b) ? (a) : (b)) 116 117 #include <stdbool.h> 118 #include <intprops.h> 119 #include "propername.h" 120 #include "version.h" 121 122 /* Type used for fast comparison of several bytes at a time. */ 123 124 #ifndef word 125 # define word uintmax_t 126 #endif 127 128 /* The integer type of a line number. Since files are read into main 129 memory, ptrdiff_t should be wide enough. */ 130 131 typedef ptrdiff_t lin; 132 #define LIN_MAX PTRDIFF_MAX 133 verify (TYPE_SIGNED (lin)); 134 verify (sizeof (ptrdiff_t) <= sizeof (lin)); 135 verify (sizeof (lin) <= sizeof (long int)); 136 137 /* This section contains POSIX-compliant defaults for macros 138 that are meant to be overridden by hand in config.h as needed. */ 139 140 #ifndef file_name_cmp 141 # define file_name_cmp strcmp 142 #endif 143 144 #ifndef initialize_main 145 # define initialize_main(argcp, argvp) 146 #endif 147 148 #ifndef NULL_DEVICE 149 # define NULL_DEVICE "/dev/null" 150 #endif 151 152 /* Do struct stat *S, *T describe the same special file? */ 153 #ifndef same_special_file 154 # if HAVE_STRUCT_STAT_ST_RDEV && defined S_ISBLK && defined S_ISCHR 155 # define same_special_file(s, t) \ 156 (((S_ISBLK ((s)->st_mode) && S_ISBLK ((t)->st_mode)) \ 157 || (S_ISCHR ((s)->st_mode) && S_ISCHR ((t)->st_mode))) \ 158 && (s)->st_rdev == (t)->st_rdev) 159 # else 160 # define same_special_file(s, t) 0 161 # endif 162 #endif 163 164 /* Do struct stat *S, *T describe the same file? Answer -1 if unknown. */ 165 #ifndef same_file 166 # define same_file(s, t) \ 167 ((((s)->st_ino == (t)->st_ino) && ((s)->st_dev == (t)->st_dev)) \ 168 || same_special_file (s, t)) 169 #endif 170 171 /* Do struct stat *S, *T have the same file attributes? 172 173 POSIX says that two files are identical if st_ino and st_dev are 174 the same, but many file systems incorrectly assign the same (device, 175 inode) pair to two distinct files, including: 176 177 - GNU/Linux NFS servers that export all local file systems as a 178 single NFS file system, if a local device number (st_dev) exceeds 179 255, or if a local inode number (st_ino) exceeds 16777215. 180 181 - Network Appliance NFS servers in snapshot directories; see 182 Network Appliance bug #195. 183 184 - ClearCase MVFS; see bug id ATRia04618. 185 186 Check whether two files that purport to be the same have the same 187 attributes, to work around instances of this common bug. Do not 188 inspect all attributes, only attributes useful in checking for this 189 bug. 190 191 It's possible for two distinct files on a buggy file system to have 192 the same attributes, but it's not worth slowing down all 193 implementations (or complicating the configuration) to cater to 194 these rare cases in buggy implementations. */ 195 196 #ifndef same_file_attributes 197 # define same_file_attributes(s, t) \ 198 ((s)->st_mode == (t)->st_mode \ 199 && (s)->st_nlink == (t)->st_nlink \ 200 && (s)->st_uid == (t)->st_uid \ 201 && (s)->st_gid == (t)->st_gid \ 202 && (s)->st_size == (t)->st_size \ 203 && (s)->st_mtime == (t)->st_mtime \ 204 && (s)->st_ctime == (t)->st_ctime) 205 #endif 206 207 #define STREQ(a, b) (strcmp (a, b) == 0) 208