gnu/dist/diffutils/src/system.h

   1 /*      $NetBSD: system.h,v 1.1.1.1 2003/01/26 00:43:16 wiz Exp $       */
   2
   3 /* System dependent declarations.
   4
   5    Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1998, 2001, 2002
   6    Free Software Foundation, Inc.
   7
   8    This file is part of GNU DIFF.
   9
  10    GNU DIFF is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2, or (at your option)
  13    any later version.
  14
  15    GNU DIFF is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; see the file COPYING.
  22    If not, write to the Free Software Foundation,
  23    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  24
  25 #include <config.h>
  26
  27 /* Don't bother to support K&R C compilers any more; it's not worth
  28    the trouble.  These macros prevent some library modules from being
  29    compiled in K&R C mode.  */
  30 #define PARAMS(Args) Args
  31 #define PROTOTYPES 1
  32
  33 /* Define `__attribute__' and `volatile' first
  34    so that they're used consistently in all system includes.  */
  35 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6) || __STRICT_ANSI__
  36 # define __attribute__(x)
  37 #endif
  38 #if defined const && !defined volatile
  39 # define volatile
  40 #endif
  41
  42 /* Verify a requirement at compile-time (unlike assert, which is runtime).  */
  43 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
  44
  45
  46 /* Determine whether an integer type is signed, and its bounds.
  47    This code assumes two's (or one's!) complement with no holes.  */
  48
  49 /* The extra casts work around common compiler bugs,
  50    e.g. Cray C 5.0.3.0 when t == time_t.  */
  51 #ifndef TYPE_SIGNED
  52 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
  53 #endif
  54 #ifndef TYPE_MINIMUM
  55 # define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
  56                                ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) \
  57                                : (t) 0))
  58 #endif
  59 #ifndef TYPE_MAXIMUM
  60 # define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
  61 #endif
  62
  63 #include <sys/types.h>
  64 #include <sys/stat.h>
  65
  66 #if STAT_MACROS_BROKEN
  67 # undef S_ISBLK
  68 # undef S_ISCHR
  69 # undef S_ISDIR
  70 # undef S_ISFIFO
  71 # undef S_ISREG
  72 # undef S_ISSOCK
  73 #endif
  74 #ifndef S_ISDIR
  75 # define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
  76 #endif
  77 #ifndef S_ISREG
  78 # define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
  79 #endif
  80 #if !defined S_ISBLK && defined S_IFBLK
  81 # define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
  82 #endif
  83 #if !defined S_ISCHR && defined S_IFCHR
  84 # define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
  85 #endif
  86 #if !defined S_ISFIFO && defined S_IFFIFO
  87 # define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFFIFO)
  88 #endif
  89 #if !defined S_ISSOCK && defined S_IFSOCK
  90 # define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
  91 #endif
  92 #ifndef S_IXUSR
  93 # define S_IXUSR 0100
  94 #endif
  95 #ifndef S_IXGRP
  96 # define S_IXGRP 0010
  97 #endif
  98 #ifndef S_IXOTH
  99 # define S_IXOTH 0001
 100 #endif
 101
 102 #if HAVE_UNISTD_H
 103 # include <unistd.h>
 104 #endif
 105
 106 #ifndef SEEK_SET
 107 # define SEEK_SET 0
 108 #endif
 109 #ifndef SEEK_CUR
 110 # define SEEK_CUR 1
 111 #endif
 112
 113 #ifndef STDIN_FILENO
 114 # define STDIN_FILENO 0
 115 #endif
 116 #ifndef STDOUT_FILENO
 117 # define STDOUT_FILENO 1
 118 #endif
 119 #ifndef STDERR_FILENO
 120 # define STDERR_FILENO 2
 121 #endif
 122
 123 #if HAVE_TIME_H
 124 # include <time.h>
 125 #else
 126 # include <sys/time.h>
 127 #endif
 128
 129 #if HAVE_FCNTL_H
 130 # include <fcntl.h>
 131 #else
 132 # if HAVE_SYS_FILE_H
 133 #  include <sys/file.h>
 134 # endif
 135 #endif
 136
 137 #if !HAVE_DUP2
 138 # define dup2(f, t) (close (t), fcntl (f, F_DUPFD, t))
 139 #endif
 140
 141 #ifndef O_RDONLY
 142 # define O_RDONLY 0
 143 #endif
 144 #ifndef O_RDWR
 145 # define O_RDWR 2
 146 #endif
 147 #ifndef S_IRUSR
 148 # define S_IRUSR 0400
 149 #endif
 150 #ifndef S_IWUSR
 151 # define S_IWUSR 0200
 152 #endif
 153
 154 #if HAVE_SYS_WAIT_H
 155 # include <sys/wait.h>
 156 #endif
 157 #ifndef WEXITSTATUS
 158 # define WEXITSTATUS(stat_val) ((unsigned int) (stat_val) >> 8)
 159 #endif
 160 #ifndef WIFEXITED
 161 # define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
 162 #endif
 163
 164 #ifndef STAT_BLOCKSIZE
 165 # if HAVE_STRUCT_STAT_ST_BLKSIZE
 166 #  define STAT_BLOCKSIZE(s) ((s).st_blksize)
 167 # else
 168 #  define STAT_BLOCKSIZE(s) (8 * 1024)
 169 # endif
 170 #endif
 171
 172 #if HAVE_DIRENT_H
 173 # include <dirent.h>
 174 # define NAMLEN(dirent) strlen ((dirent)->d_name)
 175 #else
 176 # define dirent direct
 177 # define NAMLEN(dirent) ((dirent)->d_namlen)
 178 # if HAVE_SYS_NDIR_H
 179 #  include <sys/ndir.h>
 180 # endif
 181 # if HAVE_SYS_DIR_H
 182 #  include <sys/dir.h>
 183 # endif
 184 # if HAVE_NDIR_H
 185 #  include <ndir.h>
 186 # endif
 187 #endif
 188
 189 #if HAVE_STDLIB_H
 190 # include <stdlib.h>
 191 #else
 192 # ifndef getenv
 193    char *getenv ();
 194 # endif
 195 #endif
 196 #ifndef EXIT_SUCCESS
 197 # define EXIT_SUCCESS 0
 198 #endif
 199 #if !EXIT_FAILURE
 200 # undef EXIT_FAILURE /* Sony NEWS-OS 4.0C defines EXIT_FAILURE to 0.  */
 201 # define EXIT_FAILURE 1
 202 #endif
 203 #define EXIT_TROUBLE 2
 204
 205 #include <limits.h>
 206 #ifndef SSIZE_MAX
 207 # define SSIZE_MAX TYPE_MAXIMUM (ssize_t)
 208 #endif
 209
 210 #if HAVE_INTTYPES_H
 211 # include <inttypes.h>
 212 #endif
 213 #ifndef PTRDIFF_MAX
 214 # define PTRDIFF_MAX TYPE_MAXIMUM (ptrdiff_t)
 215 #endif
 216 #ifndef SIZE_MAX
 217 # define SIZE_MAX TYPE_MAXIMUM (size_t)
 218 #endif
 219 #ifndef UINTMAX_MAX
 220 # define UINTMAX_MAX TYPE_MAXIMUM (uintmax_t)
 221 #endif
 222 #if ! HAVE_STRTOUMAX  && ! defined strtoumax
 223 uintmax_t strtoumax (char const *, char **, int);
 224 #endif
 225
 226 #include <stddef.h>
 227
 228 #if STDC_HEADERS || HAVE_STRING_H
 229 # include <string.h>
 230 #else
 231 # if !HAVE_STRCHR
 232 #  define strchr index
 233 #  define strrchr rindex
 234 # endif
 235 char *strchr (), *strrchr ();
 236 # if !HAVE_MEMCHR
 237 #  define memcmp(s1, s2, n) bcmp (s1, s2, n)
 238 #  define memcpy(d, s, n) bcopy (s, d, n)
 239 void *memchr ();
 240 # endif
 241 #endif
 242
 243 #if HAVE_LOCALE_H
 244 # include <locale.h>
 245 #else
 246 # define setlocale(category, locale)
 247 #endif
 248
 249 #include <gettext.h>
 250
 251 #define _(msgid) gettext (msgid)
 252 #define N_(msgid) msgid
 253
 254 #include <ctype.h>
 255
 256 /* CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
 257    as an argument to <ctype.h> macros like `isspace'.  */
 258 #if STDC_HEADERS
 259 # define CTYPE_DOMAIN(c) 1
 260 #else
 261 # define CTYPE_DOMAIN(c) ((unsigned int) (c) <= 0177)
 262 #endif
 263 #define ISPRINT(c) (CTYPE_DOMAIN (c) && isprint (c))
 264 #define ISSPACE(c) (CTYPE_DOMAIN (c) && isspace (c))
 265
 266 #if STDC_HEADERS
 267 # define TOLOWER(c) tolower (c)
 268 #else
 269 # ifndef _tolower
 270 #  define _tolower(c) tolower (c)
 271 # endif
 272 # define TOLOWER(c) (CTYPE_DOMAIN (c) && isupper (c) ? _tolower (c) : (c))
 273 #endif
 274
 275 /* ISDIGIT differs from isdigit, as follows:
 276    - Its arg may be any int or unsigned int; it need not be an unsigned char.
 277    - It's guaranteed to evaluate its argument exactly once.
 278    - It's typically faster.
 279    POSIX 1003.1-2001 says that only '0' through '9' are digits.
 280    Prefer ISDIGIT to isdigit unless it's important to use the locale's
 281    definition of `digit' even when the host does not conform to POSIX.  */
 282 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
 283
 284 #include <errno.h>
 285 #if !STDC_HEADERS
 286  extern int errno;
 287 #endif
 288
 289 #include <signal.h>
 290 #ifndef SA_RESTART
 291 # ifdef SA_INTERRUPT /* e.g. SunOS 4.1.x */
 292 #  define SA_RESTART SA_INTERRUPT
 293 # else
 294 #  define SA_RESTART 0
 295 # endif
 296 #endif
 297 #if !defined SIGCHLD && defined SIGCLD
 298 # define SIGCHLD SIGCLD
 299 #endif
 300
 301 #undef MIN
 302 #undef MAX
 303 #define MIN(a, b) ((a) <= (b) ? (a) : (b))
 304 #define MAX(a, b) ((a) >= (b) ? (a) : (b))
 305
 306 #if HAVE_STDBOOL_H
 307 # include <stdbool.h>
 308 #else
 309 # define bool unsigned char
 310 #endif
 311
 312 #if HAVE_VFORK_H
 313 # include <vfork.h>
 314 #endif
 315
 316 #if ! HAVE_WORKING_VFORK
 317 # define vfork fork
 318 #endif
 319 \f
 320 /* Type used for fast comparison of several bytes at a time.  */
 321
 322 #ifndef word
 323 # define word uintmax_t
 324 #endif
 325
 326 /* The integer type of a line number.  Since files are read into main
 327    memory, ptrdiff_t should be wide enough.  */
 328
 329 typedef ptrdiff_t lin;
 330 #define LIN_MAX PTRDIFF_MAX
 331 verify (lin_is_signed, TYPE_SIGNED (lin));
 332 verify (lin_is_wide_enough, sizeof (ptrdiff_t) <= sizeof (lin));
 333 verify (lin_is_printable_as_long, sizeof (lin) <= sizeof (long));
 334 \f
 335 /* This section contains POSIX-compliant defaults for macros
 336    that are meant to be overridden by hand in config.h as needed.  */
 337
 338 #ifndef file_name_cmp
 339 # define file_name_cmp strcmp
 340 #endif
 341
 342 #ifndef initialize_main
 343 # define initialize_main(argcp, argvp)
 344 #endif
 345
 346 #ifndef NULL_DEVICE
 347 # define NULL_DEVICE "/dev/null"
 348 #endif
 349
 350 /* Do struct stat *S, *T describe the same special file?  */
 351 #ifndef same_special_file
 352 # if HAVE_STRUCT_STAT_ST_RDEV && defined S_ISBLK && defined S_ISCHR
 353 #  define same_special_file(s, t) \
 354      (((S_ISBLK ((s)->st_mode) && S_ISBLK ((t)->st_mode)) \
 355        || (S_ISCHR ((s)->st_mode) && S_ISCHR ((t)->st_mode))) \
 356       && (s)->st_rdev == (t)->st_rdev)
 357 # else
 358 #  define same_special_file(s, t) 0
 359 # endif
 360 #endif
 361
 362 /* Do struct stat *S, *T describe the same file?  Answer -1 if unknown.  */
 363 #ifndef same_file
 364 # define same_file(s, t) \
 365     ((((s)->st_ino == (t)->st_ino) && ((s)->st_dev == (t)->st_dev)) \
 366      || same_special_file (s, t))
 367 #endif
 368
 369 /* Do struct stat *S, *T have the same file attributes?
 370
 371    POSIX says that two files are identical if st_ino and st_dev are
 372    the same, but many filesystems incorrectly assign the same (device,
 373    inode) pair to two distinct files, including:
 374
 375    - GNU/Linux NFS servers that export all local filesystems as a
 376      single NFS filesystem, if a local device number (st_dev) exceeds
 377      255, or if a local inode number (st_ino) exceeds 16777215.
 378
 379    - Network Appliance NFS servers in snapshot directories; see
 380      Network Appliance bug #195.
 381
 382    - ClearCase MVFS; see bug id ATRia04618.
 383
 384    Check whether two files that purport to be the same have the same
 385    attributes, to work around instances of this common bug.  Do not
 386    inspect all attributes, only attributes useful in checking for this
 387    bug.
 388
 389    It's possible for two distinct files on a buggy filesystem to have
 390    the same attributes, but it's not worth slowing down all
 391    implementations (or complicating the configuration) to cater to
 392    these rare cases in buggy implementations.  */
 393
 394 #ifndef same_file_attributes
 395 # define same_file_attributes(s, t) \
 396    ((s)->st_mode == (t)->st_mode \
 397     && (s)->st_nlink == (t)->st_nlink \
 398     && (s)->st_uid == (t)->st_uid \
 399     && (s)->st_gid == (t)->st_gid \
 400     && (s)->st_size == (t)->st_size \
 401     && (s)->st_mtime == (t)->st_mtime \
 402     && (s)->st_ctime == (t)->st_ctime)
 403 #endif