contrib/diffutils/src/system.h

   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 \f
 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)