contrib/cvs-1.12/lib/system.h

   1 /* system-dependent definitions for CVS.
   2    Copyright (C) 1989-1992 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.  */
  13
  14 /***
  15  *** Begin the default set of autoconf includes.
  16  ***/
  17
  18 /* Headers assumed for C89 freestanding compilers.  See HACKING for more.  */
  19 #include <limits.h>
  20 #include <stdarg.h>
  21 #include <stddef.h>
  22
  23 /* C89 hosted headers assumed since they were included in UNIX version 7.
  24  * See HACKING for more.
  25  */
  26 #include <assert.h>
  27 #include <ctype.h>
  28 #include <errno.h>
  29 #include <signal.h>
  30 #include <stdio.h>
  31
  32 /* C89 hosted headers we _think_ GCC supplies even on freestanding systems.
  33  * If we find any systems which do not have them, a replacement header should
  34  * be discussed with the GNULIB folks.
  35  *
  36  * For more information, please see the `Portability' section of the `HACKING'
  37  * file.
  38  */
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 /* We assume this because it has been around forever despite not being a part
  43  * of any of the other standards we assume conformance to.  So far this hasn't
  44  * been a problem.
  45  *
  46  * For more information, please see the `Portability' section of the `HACKING'
  47  * file.
  48  */
  49 #include <sys/types.h>
  50
  51 /* A GNULIB replacement for this C99 header is supplied when it is missing.
  52  * See the comments in stdbool_.h for its limitations.
  53  */
  54 #include <stdbool.h>
  55
  56 /* Ditto for these POSIX.2 headers.  */
  57 #include <fnmatch.h>
  58 #include <getopt.h>     /* Has GNU extensions,  */
  59
  60 /* We assume <sys/stat.h> because GNULIB does.  */
  61 #include <sys/stat.h>
  62
  63 #if !STDC_HEADERS && HAVE_MEMORY_H
  64 # include <memory.h>
  65 #endif /* !STDC_HEADERS && HAVE_MEMORY_H */
  66 #if HAVE_INTTYPES_H
  67 # include <inttypes.h>
  68 #else /* ! HAVE_INTTYPES_H */
  69 # if HAVE_STDINT_H
  70 #  include <stdint.h>
  71 # endif /* HAVE_STDINT_H */
  72 #endif /* HAVE_INTTYPES_H */
  73 #if HAVE_UNISTD_H
  74 # include <unistd.h>
  75 #endif /* HAVE_UNISTD_H */
  76 /* End the default set of autoconf includes */
  77
  78 /* Assume these headers. */
  79 #include <pwd.h>
  80
  81 /* There is a replacement stub for gettext provided by GNULIB when gettext is
  82  * not available.
  83  */
  84 #include <gettext.h>
  85
  86 #ifndef DEVNULL
  87 # define        DEVNULL         "/dev/null"
  88 #endif
  89
  90 #ifdef HAVE_IO_H
  91 #include <io.h>
  92 #endif
  93
  94 #ifdef HAVE_DIRECT_H
  95 #include <direct.h>
  96 #endif
  97
  98 /* The NeXT (without _POSIX_SOURCE, which we don't want) has a utime.h
  99    which doesn't define anything.  It would be cleaner to have configure
 100    check for struct utimbuf, but for now I'm checking NeXT here (so I don't
 101    have to debug the configure check across all the machines).  */
 102 #if defined (HAVE_UTIME_H) && !defined (NeXT)
 103 #  include <utime.h>
 104 #else
 105 #  if defined (HAVE_SYS_UTIME_H)
 106 #    include <sys/utime.h>
 107 #  else
 108 #    ifndef ALTOS
 109 struct utimbuf
 110 {
 111   long actime;
 112   long modtime;
 113 };
 114 #    endif
 115 int utime ();
 116 #  endif
 117 #endif
 118
 119 /* errno.h variations:
 120  *
 121  * Not all systems set the same error code on a non-existent-file
 122  * error.  This tries to ask the question somewhat portably.
 123  * On systems that don't have ENOTEXIST, this should behave just like
 124  * x == ENOENT.  "x" is probably errno, of course.
 125  */
 126 #ifdef ENOTEXIST
 127 #  ifdef EOS2ERR
 128 #    define existence_error(x) \
 129      (((x) == ENOTEXIST) || ((x) == ENOENT) || ((x) == EOS2ERR))
 130 #  else
 131 #    define existence_error(x) \
 132      (((x) == ENOTEXIST) || ((x) == ENOENT))
 133 #  endif
 134 #else
 135 #  ifdef EVMSERR
 136 #     define existence_error(x) \
 137 ((x) == ENOENT || (x) == EINVAL || (x) == EVMSERR)
 138 #  else
 139 #    define existence_error(x) ((x) == ENOENT)
 140 #  endif
 141 #endif
 142
 143 /* check for POSIX signals */
 144 #if defined(HAVE_SIGACTION) && defined(HAVE_SIGPROCMASK)
 145 # define POSIX_SIGNALS
 146 #endif
 147
 148 /* MINIX 1.6 doesn't properly support sigaction */
 149 #if defined(_MINIX)
 150 # undef POSIX_SIGNALS
 151 #endif
 152
 153 /* If !POSIX, try for BSD.. Reason: 4.4BSD implements these as wrappers */
 154 #if !defined(POSIX_SIGNALS)
 155 # if defined(HAVE_SIGVEC) && defined(HAVE_SIGSETMASK) && defined(HAVE_SIGBLOCK)
 156 #  define BSD_SIGNALS
 157 # endif
 158 #endif
 159
 160 /* Under OS/2, this must be included _after_ stdio.h; that's why we do
 161    it here. */
 162 #ifdef USE_OWN_TCPIP_H
 163 # include "tcpip.h"
 164 #endif
 165
 166 #ifdef HAVE_FCNTL_H
 167 # include <fcntl.h>
 168 #else
 169 # include <sys/file.h>
 170 #endif
 171
 172 #ifndef SEEK_SET
 173 # define SEEK_SET 0
 174 # define SEEK_CUR 1
 175 # define SEEK_END 2
 176 #endif
 177
 178 #ifndef F_OK
 179 # define F_OK 0
 180 # define X_OK 1
 181 # define W_OK 2
 182 # define R_OK 4
 183 #endif
 184
 185 #if HAVE_DIRENT_H
 186 # include <dirent.h>
 187 # define NAMLEN(dirent) strlen((dirent)->d_name)
 188 #else
 189 # define dirent direct
 190 # define NAMLEN(dirent) (dirent)->d_namlen
 191 # if HAVE_SYS_NDIR_H
 192 #  include <sys/ndir.h>
 193 # endif
 194 # if HAVE_SYS_DIR_H
 195 #  include <sys/dir.h>
 196 # endif
 197 # if HAVE_NDIR_H
 198 #  include <ndir.h>
 199 # endif
 200 #endif
 201
 202 /* Convert B 512-byte blocks to kilobytes if K is nonzero,
 203    otherwise return it unchanged. */
 204 #define convert_blocks(b, k) ((k) ? ((b) + 1) / 2 : (b))
 205
 206 /* Under non-UNIX operating systems (MS-DOS, WinNT, MacOS), many filesystem
 207    calls take  only one argument; permission is handled very differently on
 208    those systems than in Unix.  So we leave such systems a hook on which they
 209    can hang their own definitions.  */
 210
 211 #ifndef CVS_ACCESS
 212 # define CVS_ACCESS access
 213 #endif
 214
 215 #ifndef CVS_CHDIR
 216 # define CVS_CHDIR chdir
 217 #endif
 218
 219 #ifndef CVS_CREAT
 220 # define CVS_CREAT creat
 221 #endif
 222
 223 #ifndef CVS_FOPEN
 224 # define CVS_FOPEN fopen
 225 #endif
 226
 227 #ifndef CVS_FDOPEN
 228 # define CVS_FDOPEN fdopen
 229 #endif
 230
 231 #ifndef CVS_MKDIR
 232 # define CVS_MKDIR mkdir
 233 #endif
 234
 235 #ifndef CVS_OPEN
 236 # define CVS_OPEN open
 237 #endif
 238
 239 #ifndef CVS_READDIR
 240 # define CVS_READDIR readdir
 241 #endif
 242
 243 #ifndef CVS_CLOSEDIR
 244 # define CVS_CLOSEDIR closedir
 245 #endif
 246
 247 #ifndef CVS_OPENDIR
 248 # define CVS_OPENDIR opendir
 249 #endif
 250
 251 #ifndef CVS_RENAME
 252 # define CVS_RENAME rename
 253 #endif
 254
 255 #ifndef CVS_RMDIR
 256 # define CVS_RMDIR rmdir
 257 #endif
 258
 259 #ifndef CVS_UNLINK
 260 # define CVS_UNLINK unlink
 261 #endif
 262
 263 /* Wildcard matcher.  Should be case-insensitive if the system is.  */
 264 #ifndef CVS_FNMATCH
 265 # define CVS_FNMATCH fnmatch
 266 #endif
 267
 268 #ifndef HAVE_FSEEKO
 269 off_t ftello (FILE *);
 270 int fseeko (FILE *, off_t, int);
 271 #endif /* HAVE_FSEEKO */
 272
 273 #ifdef FILENAMES_CASE_INSENSITIVE
 274
 275 # if defined (__CYGWIN32__) || defined (WOE32)
 276     /* Under Windows, filenames are case-insensitive, and both / and \
 277        are path component separators.  */
 278 #   define FOLD_FN_CHAR(c) (WNT_filename_classes[(unsigned char) (c)])
 279 extern unsigned char WNT_filename_classes[];
 280 # else /* !__CYGWIN32__ && !WOE32 */
 281   /* As far as I know, only Macintosh OS X & VMS make it here, but any
 282    * platform defining FILENAMES_CASE_INSENSITIVE which isn't WOE32 or
 283    * piggy-backing the same could, in theory.  Since the OS X fold just folds
 284    * A-Z into a-z, I'm just allowing it to be used for any case insensitive
 285    * system which we aren't yet making other specific folds or exceptions for.
 286    * WOE32 needs its own class since \ and C:\ style absolute paths also need
 287    * to be accounted for.
 288    */
 289 #   define FOLD_FN_CHAR(c) (OSX_filename_classes[(unsigned char) (c)])
 290 extern unsigned char OSX_filename_classes[];
 291 # endif /* __CYGWIN32__ || WOE32 */
 292
 293 /* The following need to be declared for all case insensitive filesystems.
 294  * When not FOLD_FN_CHAR is not #defined, a default definition for these
 295  * functions is provided later in this header file.  */
 296
 297 /* Like strcmp, but with the appropriate tweaks for file names.  */
 298 extern int fncmp (const char *n1, const char *n2);
 299
 300 /* Fold characters in FILENAME to their canonical forms.  */
 301 extern void fnfold (char *FILENAME);
 302
 303 #endif /* FILENAMES_CASE_INSENSITIVE */
 304
 305
 306
 307 /* Some file systems are case-insensitive.  If FOLD_FN_CHAR is
 308    #defined, it maps the character C onto its "canonical" form.  In a
 309    case-insensitive system, it would map all alphanumeric characters
 310    to lower case.  Under Windows NT, / and \ are both path component
 311    separators, so FOLD_FN_CHAR would map them both to /.  */
 312 #ifndef FOLD_FN_CHAR
 313 # define FOLD_FN_CHAR(c) (c)
 314 # define fnfold(filename) (filename)
 315 # define fncmp strcmp
 316 #endif
 317
 318 /* Different file systems can have different naming patterns which designate
 319  * a path as absolute.
 320  */
 321 #ifndef ISABSOLUTE
 322 # define ISABSOLUTE(s) ISSLASH(s[FILE_SYSTEM_PREFIX_LEN(s)])
 323 #endif
 324
 325
 326 /* On some systems, we have to be careful about writing/reading files
 327    in text or binary mode (so in text mode the system can handle CRLF
 328    vs. LF, VMS text file conventions, &c).  We decide to just always
 329    be careful.  That way we don't have to worry about whether text and
 330    binary differ on this system.  We just have to worry about whether
 331    the system has O_BINARY and "rb".  The latter is easy; all ANSI C
 332    libraries have it, SunOS4 has it, and CVS has used it unguarded
 333    some places for a while now without complaints (e.g. "rb" in
 334    server.c (server_updated), since CVS 1.8).  The former is just an
 335    #ifdef.  */
 336
 337 #define FOPEN_BINARY_READ ("rb")
 338 #define FOPEN_BINARY_WRITE ("wb")
 339 #define FOPEN_BINARY_READWRITE ("r+b")
 340
 341 #ifdef O_BINARY
 342 #define OPEN_BINARY (O_BINARY)
 343 #else
 344 #define OPEN_BINARY (0)
 345 #endif
 346
 347 #ifndef fd_select
 348 # define fd_select select
 349 #endif