/contrib/cvs/diff/system.h

  1/* System dependent declarations.
  2   Copyright (C) 1988, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
  3
  4This file is part of GNU DIFF.
  5
  6GNU DIFF is free software; you can redistribute it and/or modify
  7it under the terms of the GNU General Public License as published by
  8the Free Software Foundation; either version 2, or (at your option)
  9any later version.
 10
 11GNU DIFF is distributed in the hope that it will be useful,
 12but WITHOUT ANY WARRANTY; without even the implied warranty of
 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14GNU General Public License for more details.
 15
 16*/
 17
 18/* We must define `volatile' and `const' first (the latter inside config.h),
 19   so that they're used consistently in all system includes.  */
 20#if !__STDC__
 21#ifndef volatile
 22#define volatile
 23#endif
 24#endif
 25#include <config.h>
 26
 27#include <sys/types.h>
 28#include <sys/stat.h>
 29
 30/* Note that PARAMS is just internal to the diff library; diffrun.h
 31   has its own mechanism, which will hopefully be less likely to
 32   conflict with the library's caller's namespace.  */
 33#if __STDC__
 34#define PARAMS(args) args
 35#define VOID void
 36#else
 37#define PARAMS(args) ()
 38#define VOID char
 39#endif
 40
 41#if STAT_MACROS_BROKEN
 42#undef S_ISBLK
 43#undef S_ISCHR
 44#undef S_ISDIR
 45#undef S_ISFIFO
 46#undef S_ISREG
 47#undef S_ISSOCK
 48#endif
 49#ifndef S_ISDIR
 50#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
 51#endif
 52#ifndef S_ISREG
 53#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
 54#endif
 55#if !defined(S_ISBLK) && defined(S_IFBLK)
 56#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
 57#endif
 58#if !defined(S_ISCHR) && defined(S_IFCHR)
 59#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
 60#endif
 61#if !defined(S_ISFIFO) && defined(S_IFFIFO)
 62#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFFIFO)
 63#endif
 64
 65#ifndef S_ISSOCK
 66# if defined( S_IFSOCK )
 67#   ifdef S_IFMT
 68#     define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
 69#   else
 70#     define S_ISSOCK(mode) ((mode) & S_IFSOCK)
 71#   endif /* S_IFMT */
 72# elif defined( S_ISNAM )
 73    /* SCO OpenServer 5.0.6a */
 74#   define S_ISSOCK S_ISNAM
 75# endif /* !S_IFSOCK && S_ISNAM */
 76#endif /* !S_ISSOCK */
 77
 78#if HAVE_UNISTD_H
 79#include <unistd.h>
 80#endif
 81
 82#ifdef HAVE_IO_H
 83# include <io.h>
 84#endif
 85
 86#ifdef HAVE_FCNTL_H
 87# include <fcntl.h>
 88#else
 89# include <sys/file.h>
 90#endif
 91
 92#ifndef SEEK_SET
 93#define SEEK_SET 0
 94#endif
 95#ifndef SEEK_CUR
 96#define SEEK_CUR 1
 97#endif
 98
 99#ifndef STDIN_FILENO
100#define STDIN_FILENO 0
101#endif
102#ifndef STDOUT_FILENO
103#define STDOUT_FILENO 1
104#endif
105#ifndef STDERR_FILENO
106#define STDERR_FILENO 2
107#endif
108
109/* I believe that all relevant systems have
110   time.h.  It is in ANSI, for example.  The
111   code below looks quite bogus as I don't think
112   sys/time.h is ever a substitute for time.h;
113   it is something different.  */
114#define HAVE_TIME_H 1
115
116#if HAVE_TIME_H
117#include <time.h>
118#else
119#include <sys/time.h>
120#endif
121
122#if HAVE_FCNTL_H
123#include <fcntl.h>
124#else
125#if HAVE_SYS_FILE_H
126#include <sys/file.h>
127#endif
128#endif
129
130#ifndef O_RDONLY
131#define O_RDONLY 0
132#endif
133
134#if HAVE_SYS_WAIT_H
135#include <sys/wait.h>
136#endif
137#ifndef WEXITSTATUS
138#define WEXITSTATUS(stat_val) ((unsigned) (stat_val) >> 8)
139#endif
140#ifndef WIFEXITED
141#define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
142#endif
143
144#ifndef STAT_BLOCKSIZE
145#if HAVE_STRUCT_STAT_ST_BLKSIZE
146#define STAT_BLOCKSIZE(s) (s).st_blksize
147#else
148#define STAT_BLOCKSIZE(s) (8 * 1024)
149#endif
150#endif
151
152#if HAVE_DIRENT_H
153# include <dirent.h>
154# define NAMLEN(dirent) strlen((dirent)->d_name)
155#else
156# define dirent direct
157# define NAMLEN(dirent) ((dirent)->d_namlen)
158# if HAVE_SYS_NDIR_H
159#  include <sys/ndir.h>
160# endif
161# if HAVE_SYS_DIR_H
162#  include <sys/dir.h>
163# endif
164# if HAVE_NDIR_H
165#  include <ndir.h>
166# endif
167#endif
168
169#if HAVE_VFORK_H
170#include <vfork.h>
171#endif
172
173#if HAVE_STDLIB_H || defined(STDC_HEADERS)
174#include <stdlib.h>
175#else
176VOID *malloc ();
177VOID *realloc ();
178#endif
179#ifndef getenv
180char *getenv ();
181#endif
182
183#if HAVE_LIMITS_H
184#include <limits.h>
185#endif
186#ifndef INT_MAX
187#define INT_MAX 2147483647
188#endif
189#ifndef CHAR_BIT
190#define CHAR_BIT 8
191#endif
192
193#if STDC_HEADERS || HAVE_STRING_H
194# include <string.h>
195# ifndef bzero
196#  define bzero(s, n) memset (s, 0, n)
197# endif
198#else
199# if !HAVE_STRCHR
200#  define strchr index
201#  define strrchr rindex
202# endif
203char *strchr (), *strrchr ();
204# if !HAVE_MEMCHR
205#  define memcmp(s1, s2, n) bcmp (s1, s2, n)
206#  define memcpy(d, s, n) bcopy (s, d, n)
207void *memchr ();
208# endif
209#endif
210
211#include <ctype.h>
212/* CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
213   as an argument to <ctype.h> macros like `isspace'.  */
214#if STDC_HEADERS
215#define CTYPE_DOMAIN(c) 1
216#else
217#define CTYPE_DOMAIN(c) ((unsigned) (c) <= 0177)
218#endif
219#ifndef ISPRINT
220#define ISPRINT(c) (CTYPE_DOMAIN (c) && isprint (c))
221#endif
222#ifndef ISSPACE
223#define ISSPACE(c) (CTYPE_DOMAIN (c) && isspace (c))
224#endif
225#ifndef ISUPPER
226#define ISUPPER(c) (CTYPE_DOMAIN (c) && isupper (c))
227#endif
228
229#ifndef ISDIGIT
230#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
231#endif
232
233#include <errno.h>
234#if !STDC_HEADERS
235extern int errno;
236#endif
237
238#ifdef min
239#undef min
240#endif
241#ifdef max
242#undef max
243#endif
244#define min(a,b) ((a) <= (b) ? (a) : (b))
245#define max(a,b) ((a) >= (b) ? (a) : (b))
246
247/* This section contains Posix-compliant defaults for macros
248   that are meant to be overridden by hand in config.h as needed.  */
249
250#ifndef filename_cmp
251#define filename_cmp(a, b) strcmp (a, b)
252#endif
253
254#ifndef filename_lastdirchar
255#define filename_lastdirchar(filename) strrchr (filename, '/')
256#endif
257
258#ifndef HAVE_FORK
259#define HAVE_FORK 1
260#endif
261
262#ifndef HAVE_SETMODE
263#define HAVE_SETMODE 0
264#endif
265
266#ifndef initialize_main
267#define initialize_main(argcp, argvp)
268#endif
269
270/* Do struct stat *S, *T describe the same file?  Answer -1 if unknown.  */
271#ifndef same_file
272#define same_file(s,t) ((s)->st_ino==(t)->st_ino && (s)->st_dev==(t)->st_dev)
273#endif
274
275/* Place into Q a quoted version of A suitable for `popen' or `system',
276   incrementing Q and junking A.
277   Do not increment Q by more than 4 * strlen (A) + 2.  */
278#ifndef SYSTEM_QUOTE_ARG
279#define SYSTEM_QUOTE_ARG(q, a) \
280  { \
281    *(q)++ = '\''; \
282    for (;  *(a);  *(q)++ = *(a)++) \
283      if (*(a) == '\'') \
284	{ \
285	  *(q)++ = '\''; \
286	  *(q)++ = '\\'; \
287	  *(q)++ = '\''; \
288	} \
289    *(q)++ = '\''; \
290  }
291#endif
292
293/* these come from CVS's lib/system.h, but I wasn't sure how to include that
294 * properly or even if I really should
295 */
296#ifndef CVS_OPENDIR
297#define CVS_OPENDIR opendir
298#endif
299#ifndef CVS_READDIR
300#define CVS_READDIR readdir
301#endif
302#ifndef CVS_CLOSEDIR
303#define CVS_CLOSEDIR closedir
304#endif