libio/libioP.h

   1 /* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU IO Library.
   3
   4    This library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public License as
   6    published by the Free Software Foundation; either version 2, or (at
   7    your option) any later version.
   8
   9    This library is distributed in the hope that it will be useful, but
  10    WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this library; see the file COPYING.  If not, write to
  16    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  17    MA 02111-1307, USA.
  18
  19    As a special exception, if you link this library with files
  20    compiled with a GNU compiler to produce an executable, this does
  21    not cause the resulting executable to be covered by the GNU General
  22    Public License.  This exception does not however invalidate any
  23    other reasons why the executable file might be covered by the GNU
  24    General Public License.  */
  25
  26 #include <errno.h>
  27 #ifndef __set_errno
  28 # define __set_errno(Val) errno = (Val)
  29 #endif
  30 #if defined __GLIBC__ && __GLIBC__ >= 2
  31 # if __GLIBC_MINOR__ > 0
  32 #  include <bits/libc-lock.h>
  33 # else
  34 #  include <libc-lock.h>
  35 # endif
  36 #else
  37 /*# include <comthread.h>*/
  38 #endif
  39
  40 #include "iolibio.h"
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 #define _IO_seek_set 0
  47 #define _IO_seek_cur 1
  48 #define _IO_seek_end 2
  49
  50 /* THE JUMPTABLE FUNCTIONS.
  51
  52  * The _IO_FILE type is used to implement the FILE type in GNU libc,
  53  * as well as the streambuf class in GNU iostreams for C++.
  54  * These are all the same, just used differently.
  55  * An _IO_FILE (or FILE) object is allows followed by a pointer to
  56  * a jump table (of pointers to functions).  The pointer is accessed
  57  * with the _IO_JUMPS macro.  The jump table has a eccentric format,
  58  * so as to be compatible with the layout of a C++ virtual function table.
  59  * (as implemented by g++).  When a pointer to a streambuf object is
  60  * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
  61  * happens to point to the virtual function table of the streambuf.
  62  * Thus the _IO_JUMPS function table used for C stdio/libio does
  63  * double duty as the virtual function table for C++ streambuf.
  64  *
  65  * The entries in the _IO_JUMPS function table (and hence also the
  66  * virtual functions of a streambuf) are described below.
  67  * The first parameter of each function entry is the _IO_FILE/streambuf
  68  * object being acted on (i.e. the 'this' parameter).
  69  */
  70
  71 #define _IO_JUMPS(THIS) ((struct _IO_FILE_plus *) (THIS))->vtable
  72 #ifdef _G_USING_THUNKS
  73 # define JUMP_FIELD(TYPE, NAME) TYPE NAME
  74 # define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC (THIS)
  75 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC (THIS, X1)
  76 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC (THIS, X1, X2)
  77 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC (THIS, X1,X2, X3)
  78 # define JUMP_INIT(NAME, VALUE) VALUE
  79 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0)
  80 #else
  81 /* These macros will change when we re-implement vtables to use "thunks"! */
  82 # define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
  83 # define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC.pfn (THIS)
  84 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1)
  85 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1, X2)
  86 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1,X2,X3)
  87 # define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
  88 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
  89 #endif
  90
  91 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
  92    It does not delete (free) it, but does everything else to finalize it/
  93    It matches the streambuf::~streambuf virtual destructor.  */
  94 typedef void (*_IO_finish_t) __P ((_IO_FILE *, int)); /* finalize */
  95 #define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
  96
  97 /* The 'overflow' hook flushes the buffer.
  98    The second argument is a character, or EOF.
  99    It matches the streambuf::overflow virtual function. */
 100 typedef int (*_IO_overflow_t) __P ((_IO_FILE *, int));
 101 #define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
 102
 103 /* The 'underflow' hook tries to fills the get buffer.
 104    It returns the next character (as an unsigned char) or EOF.  The next
 105    character remains in the get buffer, and the get position is not changed.
 106    It matches the streambuf::underflow virtual function. */
 107 typedef int (*_IO_underflow_t) __P ((_IO_FILE *));
 108 #define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
 109
 110 /* The 'uflow' hook returns the next character in the input stream
 111    (cast to unsigned char), and increments the read position;
 112    EOF is returned on failure.
 113    It matches the streambuf::uflow virtual function, which is not in the
 114    cfront implementation, but was added to C++ by the ANSI/ISO committee. */
 115 #define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
 116
 117 /* The 'pbackfail' hook handles backing up.
 118    It matches the streambuf::pbackfail virtual function. */
 119 typedef int (*_IO_pbackfail_t) __P ((_IO_FILE *, int));
 120 #define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
 121
 122 /* The 'xsputn' hook writes upto N characters from buffer DATA.
 123    Returns the number of character actually written.
 124    It matches the streambuf::xsputn virtual function. */
 125 typedef _IO_size_t (*_IO_xsputn_t) __P ((_IO_FILE *FP, const void *DATA,
 126                                          _IO_size_t N));
 127 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
 128
 129 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
 130    Returns the number of character actually read.
 131    It matches the streambuf::xsgetn virtual function. */
 132 typedef _IO_size_t (*_IO_xsgetn_t) __P ((_IO_FILE *FP, void *DATA,
 133                                          _IO_size_t N));
 134 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
 135
 136 /* The 'seekoff' hook moves the stream position to a new position
 137    relative to the start of the file (if DIR==0), the current position
 138    (MODE==1), or the end of the file (MODE==2).
 139    It matches the streambuf::seekoff virtual function.
 140    It is also used for the ANSI fseek function. */
 141 typedef _IO_fpos_t (*_IO_seekoff_t) __P ((_IO_FILE *FP, _IO_off_t OFF,
 142                                           int DIR, int MODE));
 143 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
 144
 145 /* The 'seekpos' hook also moves the stream position,
 146    but to an absolute position given by a fpos_t (seekpos).
 147    It matches the streambuf::seekpos virtual function.
 148    It is also used for the ANSI fgetpos and fsetpos functions.  */
 149 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
 150 typedef _IO_fpos_t (*_IO_seekpos_t) __P ((_IO_FILE *, _IO_fpos_t, int));
 151 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS)
 152
 153 /* The 'setbuf' hook gives a buffer to the file.
 154    It matches the streambuf::setbuf virtual function. */
 155 typedef _IO_FILE* (*_IO_setbuf_t) __P ((_IO_FILE *, char *, _IO_ssize_t));
 156 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH)
 157
 158 /* The 'sync' hook attempts to synchronize the internal data structures
 159    of the file with the external state.
 160    It matches the streambuf::sync virtual function. */
 161 typedef int (*_IO_sync_t) __P ((_IO_FILE *));
 162 #define _IO_SYNC(FP) JUMP0 (__sync, FP)
 163
 164 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
 165    It matches the streambuf::doallocate virtual function, which is not
 166    in the ANSI/ISO C++ standard, but is part traditional implementations. */
 167 typedef int (*_IO_doallocate_t) __P ((_IO_FILE *));
 168 #define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
 169
 170 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
 171    sysstat) are low-level hooks specific to this implementation.
 172    There is no correspondence in the ANSI/ISO C++ standard library.
 173    The hooks basically correspond to the Unix system functions
 174    (read, write, close, lseek, and stat) except that a _IO_FILE*
 175    parameter is used instead of a integer file descriptor;  the default
 176    implementation used for normal files just calls those functions.
 177    The advantage of overriding these functions instead of the higher-level
 178    ones (underflow, overflow etc) is that you can leave all the buffering
 179    higher-level functions.  */
 180
 181 /* The 'sysread' hook is used to read data from the external file into
 182    an existing buffer.  It generalizes the Unix read(2) function.
 183    It matches the streambuf::sys_read virtual function, which is
 184    specific to this implementation. */
 185 typedef _IO_ssize_t (*_IO_read_t) __P ((_IO_FILE *, void *, _IO_ssize_t));
 186 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN)
 187
 188 /* The 'syswrite' hook is used to write data from an existing buffer
 189    to an external file.  It generalizes the Unix write(2) function.
 190    It matches the streambuf::sys_write virtual function, which is
 191    specific to this implementation. */
 192 typedef _IO_ssize_t (*_IO_write_t) __P ((_IO_FILE *,const void *,_IO_ssize_t));
 193 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
 194
 195 /* The 'sysseek' hook is used to re-position an external file.
 196    It generalizes the Unix lseek(2) function.
 197    It matches the streambuf::sys_seek virtual function, which is
 198    specific to this implementation. */
 199 typedef _IO_fpos_t (*_IO_seek_t) __P ((_IO_FILE *, _IO_off_t, int));
 200 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
 201
 202 /* The 'sysclose' hook is used to finalize (close, finish up) an
 203    external file.  It generalizes the Unix close(2) function.
 204    It matches the streambuf::sys_close virtual function, which is
 205    specific to this implementation. */
 206 typedef int (*_IO_close_t) __P ((_IO_FILE *)); /* finalize */
 207 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
 208
 209 /* The 'sysstat' hook is used to get information about an external file
 210    into a struct stat buffer.  It generalizes the Unix fstat(2) call.
 211    It matches the streambuf::sys_stat virtual function, which is
 212    specific to this implementation. */
 213 typedef int (*_IO_stat_t) __P ((_IO_FILE *, void *));
 214 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
 215
 216
 217 #define _IO_CHAR_TYPE char /* unsigned char ? */
 218 #define _IO_INT_TYPE int
 219
 220 struct _IO_jump_t
 221 {
 222     JUMP_FIELD(_G_size_t, __dummy);
 223 #ifdef _G_USING_THUNKS
 224     JUMP_FIELD(_G_size_t, __dummy2);
 225 #endif
 226     JUMP_FIELD(_IO_finish_t, __finish);
 227     JUMP_FIELD(_IO_overflow_t, __overflow);
 228     JUMP_FIELD(_IO_underflow_t, __underflow);
 229     JUMP_FIELD(_IO_underflow_t, __uflow);
 230     JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
 231     /* showmany */
 232     JUMP_FIELD(_IO_xsputn_t, __xsputn);
 233     JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
 234     JUMP_FIELD(_IO_seekoff_t, __seekoff);
 235     JUMP_FIELD(_IO_seekpos_t, __seekpos);
 236     JUMP_FIELD(_IO_setbuf_t, __setbuf);
 237     JUMP_FIELD(_IO_sync_t, __sync);
 238     JUMP_FIELD(_IO_doallocate_t, __doallocate);
 239     JUMP_FIELD(_IO_read_t, __read);
 240     JUMP_FIELD(_IO_write_t, __write);
 241     JUMP_FIELD(_IO_seek_t, __seek);
 242     JUMP_FIELD(_IO_close_t, __close);
 243     JUMP_FIELD(_IO_stat_t, __stat);
 244 #if 0
 245     get_column;
 246     set_column;
 247 #endif
 248 };
 249
 250 /* We always allocate an extra word following an _IO_FILE.
 251    This contains a pointer to the function jump table used.
 252    This is for compatibility with C++ streambuf; the word can
 253    be used to smash to a pointer to a virtual function table. */
 254
 255 struct _IO_FILE_plus
 256 {
 257   _IO_FILE file;
 258   const struct _IO_jump_t *vtable;
 259 };
 260
 261 /* Generic functions */
 262
 263 extern _IO_fpos_t _IO_seekoff __P ((_IO_FILE *, _IO_off_t, int, int));
 264 extern _IO_fpos_t _IO_seekpos __P ((_IO_FILE *, _IO_fpos_t, int));
 265
 266 extern void _IO_switch_to_main_get_area __P ((_IO_FILE *));
 267 extern void _IO_switch_to_backup_area __P ((_IO_FILE *));
 268 extern int _IO_switch_to_get_mode __P ((_IO_FILE *));
 269 extern void _IO_init __P ((_IO_FILE *, int));
 270 extern int _IO_sputbackc __P ((_IO_FILE *, int));
 271 extern int _IO_sungetc __P ((_IO_FILE *));
 272 extern void _IO_un_link __P ((_IO_FILE *));
 273 extern void _IO_link_in __P ((_IO_FILE *));
 274 extern void _IO_doallocbuf __P ((_IO_FILE *));
 275 extern void _IO_unsave_markers __P ((_IO_FILE *));
 276 extern void _IO_setb __P ((_IO_FILE *, char *, char *, int));
 277 extern unsigned _IO_adjust_column __P ((unsigned, const char *, int));
 278 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
 279
 280 /* Marker-related function. */
 281
 282 extern void _IO_init_marker __P ((struct _IO_marker *, _IO_FILE *));
 283 extern void _IO_remove_marker __P ((struct _IO_marker *));
 284 extern int _IO_marker_difference __P ((struct _IO_marker *,
 285                                        struct _IO_marker *));
 286 extern int _IO_marker_delta __P ((struct _IO_marker *));
 287 extern int _IO_seekmark __P ((_IO_FILE *, struct _IO_marker *, int));
 288
 289 /* Default jumptable functions. */
 290
 291 extern int _IO_default_underflow __P ((_IO_FILE *));
 292 extern int _IO_default_uflow __P ((_IO_FILE *));
 293 extern int _IO_default_doallocate __P ((_IO_FILE *));
 294 extern void _IO_default_finish __P ((_IO_FILE *, int));
 295 extern int _IO_default_pbackfail __P ((_IO_FILE *, int));
 296 extern _IO_FILE* _IO_default_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 297 extern _IO_size_t _IO_default_xsputn __P ((_IO_FILE *, const void *,
 298                                            _IO_size_t));
 299 extern _IO_size_t _IO_default_xsgetn __P ((_IO_FILE *, void *, _IO_size_t));
 300 extern _IO_fpos_t _IO_default_seekoff __P ((_IO_FILE *, _IO_off_t, int, int));
 301 extern _IO_fpos_t _IO_default_seekpos __P ((_IO_FILE *, _IO_fpos_t, int));
 302 extern _IO_ssize_t _IO_default_write __P ((_IO_FILE *, const void *,
 303                                            _IO_ssize_t));
 304 extern _IO_ssize_t _IO_default_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 305 extern int _IO_default_stat __P ((_IO_FILE *, void *));
 306 extern _IO_fpos_t _IO_default_seek __P ((_IO_FILE *, _IO_off_t, int));
 307 extern int _IO_default_sync __P ((_IO_FILE *));
 308 #define _IO_default_close ((_IO_close_t) _IO_default_sync)
 309
 310 extern struct _IO_jump_t _IO_file_jumps;
 311 extern struct _IO_jump_t _IO_streambuf_jumps;
 312 extern struct _IO_jump_t _IO_proc_jumps;
 313 extern struct _IO_jump_t _IO_str_jumps;
 314 extern int _IO_do_write __P ((_IO_FILE *, const char *, _IO_size_t));
 315 extern int _IO_flush_all __P ((void));
 316 extern void _IO_cleanup __P ((void));
 317 extern void _IO_flush_all_linebuffered __P ((void));
 318
 319 #define _IO_do_flush(_f) \
 320   _IO_do_write(_f, (_f)->_IO_write_base, \
 321                (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 322 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
 323 #define _IO_mask_flags(fp, f, mask) \
 324        ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
 325 #define _IO_setg(fp, eb, g, eg)  ((fp)->_IO_read_base = (eb),\
 326         (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
 327 #define _IO_setp(__fp, __p, __ep) \
 328        ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
 329 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
 330 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
 331 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
 332 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
 333
 334 /* Jumptable functions for files. */
 335
 336 extern int _IO_file_doallocate __P ((_IO_FILE *));
 337 extern _IO_FILE* _IO_file_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 338 extern _IO_fpos_t _IO_file_seekoff __P ((_IO_FILE *, _IO_off_t, int, int));
 339 extern _IO_size_t _IO_file_xsputn __P ((_IO_FILE *, const void *, _IO_size_t));
 340 extern int _IO_file_stat __P ((_IO_FILE *, void *));
 341 extern int _IO_file_close __P ((_IO_FILE *));
 342 extern int _IO_file_underflow __P ((_IO_FILE *));
 343 extern int _IO_file_overflow __P ((_IO_FILE *, int));
 344 #define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
 345 extern void _IO_file_init __P ((_IO_FILE *));
 346 extern _IO_FILE* _IO_file_attach __P ((_IO_FILE *, int));
 347 extern _IO_FILE* _IO_file_fopen __P ((_IO_FILE *, const char *, const char *));
 348 extern _IO_ssize_t _IO_file_write __P ((_IO_FILE *, const void *,
 349                                         _IO_ssize_t));
 350 extern _IO_ssize_t _IO_file_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 351 extern int _IO_file_sync __P ((_IO_FILE *));
 352 extern int _IO_file_close_it __P ((_IO_FILE *));
 353 extern _IO_fpos_t _IO_file_seek __P ((_IO_FILE *, _IO_off_t, int));
 354 extern void _IO_file_finish __P ((_IO_FILE *, int));
 355
 356 /* Jumptable functions for proc_files. */
 357 extern _IO_FILE* _IO_proc_open __P ((_IO_FILE *, const char *, const char *));
 358 extern int _IO_proc_close __P ((_IO_FILE *));
 359
 360 /* Jumptable functions for strfiles. */
 361 extern int _IO_str_underflow __P ((_IO_FILE *));
 362 extern int _IO_str_overflow __P ((_IO_FILE *, int));
 363 extern int _IO_str_pbackfail __P ((_IO_FILE *, int));
 364 extern _IO_fpos_t _IO_str_seekoff __P ((_IO_FILE *, _IO_off_t, int, int));
 365 extern void _IO_str_finish __P ((_IO_FILE *, int));
 366
 367 /* Other strfile functions */
 368 extern void _IO_str_init_static __P ((_IO_FILE *, char *, int, char *));
 369 extern void _IO_str_init_readonly __P ((_IO_FILE *, const char *, int));
 370 extern _IO_ssize_t _IO_str_count __P ((_IO_FILE *));
 371
 372 extern int _IO_vasprintf __P ((char **result_ptr, __const char *format,
 373                                _IO_va_list args));
 374 extern int _IO_vdprintf __P ((int d, __const char *format, _IO_va_list arg));
 375 extern int _IO_vsnprintf __P ((char *string, _IO_size_t maxlen,
 376                                __const char *format, _IO_va_list args));
 377
 378
 379 extern _IO_size_t _IO_getline __P ((_IO_FILE *,char *, _IO_size_t, int, int));
 380 extern _IO_ssize_t _IO_getdelim __P ((char **, _IO_size_t *, int, _IO_FILE *));
 381 extern double _IO_strtod __P ((const char *, char **));
 382 extern char *_IO_dtoa __P ((double __d, int __mode, int __ndigits,
 383                             int *__decpt, int *__sign, char **__rve));
 384 extern int _IO_outfloat __P ((double __value, _IO_FILE *__sb, int __type,
 385                               int __width, int __precision, int __flags,
 386                               int __sign_mode, int __fill));
 387
 388 extern _IO_FILE *_IO_list_all;
 389 extern void (*_IO_cleanup_registration_needed) __P ((void));
 390
 391 #ifndef EOF
 392 # define EOF (-1)
 393 #endif
 394 #ifndef NULL
 395 # if defined __GNUG__ && \
 396     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
 397 #  define NULL (__null)
 398 # else
 399 #  if !defined(__cplusplus)
 400 #   define NULL ((void*)0)
 401 #  else
 402 #   define NULL (0)
 403 #  endif
 404 # endif
 405 #endif
 406
 407 #if _G_HAVE_MMAP
 408
 409 # include <unistd.h>
 410 # include <fcntl.h>
 411 # include <sys/mman.h>
 412 # include <sys/param.h>
 413
 414 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 415 #  define MAP_ANONYMOUS MAP_ANON
 416 # endif
 417
 418 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
 419 #  undef _G_HAVE_MMAP
 420 #  define _G_HAVE_MMAP 0
 421 # endif
 422
 423 #endif /* _G_HAVE_MMAP */
 424
 425 #if _G_HAVE_MMAP
 426
 427 # ifdef _LIBC
 428 /* When using this code in the GNU libc we must not pollute the name space.  */
 429 #  define mmap __mmap
 430 #  define munmap __munmap
 431 # endif
 432
 433 # define ROUND_TO_PAGE(_S) \
 434        (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
 435
 436 # define FREE_BUF(_B, _S) \
 437        munmap ((_B), ROUND_TO_PAGE (_S))
 438 # define ALLOC_BUF(_B, _S, _R) \
 439        do {                                                                   \
 440           (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S),                        \
 441                                 PROT_READ | PROT_WRITE,                       \
 442                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);          \
 443           if ((_B) == (char *) -1)                                            \
 444             return (_R);                                                      \
 445        } while (0)
 446
 447 #else /* _G_HAVE_MMAP */
 448
 449 # define FREE_BUF(_B, _S) \
 450        free(_B)
 451 # define ALLOC_BUF(_B, _S, _R) \
 452        do {                                                                   \
 453           (_B) = (char*)malloc(_S);                                           \
 454           if ((_B) == NULL)                                                   \
 455             return (_R);                                                      \
 456        } while (0)
 457
 458 #endif /* _G_HAVE_MMAP */
 459
 460 #ifndef OS_FSTAT
 461 # define OS_FSTAT fstat
 462 #endif
 463 struct stat;
 464 extern _IO_ssize_t _IO_read __P ((int, void *, _IO_size_t));
 465 extern _IO_ssize_t _IO_write __P ((int, const void *, _IO_size_t));
 466 extern _IO_off_t _IO_lseek __P ((int, _IO_off_t, int));
 467 extern int _IO_close __P ((int));
 468 extern int _IO_fstat __P ((int, struct stat *));
 469 extern int _IO_vscanf __P ((const char *, _IO_va_list));
 470
 471 /* Operations on _IO_fpos_t.
 472    Normally, these are trivial, but we provide hooks for configurations
 473    where an _IO_fpos_t is a struct.
 474    Note that _IO_off_t must be an integral type. */
 475
 476 /* _IO_pos_BAD is an _IO_fpos_t value indicating error, unknown, or EOF. */
 477 #ifndef _IO_pos_BAD
 478 # define _IO_pos_BAD ((_IO_fpos_t) -1)
 479 #endif
 480 /* _IO_pos_as_off converts an _IO_fpos_t value to an _IO_off_t value. */
 481 #ifndef _IO_pos_as_off
 482 # define _IO_pos_as_off(__pos) ((_IO_off_t) (__pos))
 483 #endif
 484 /* _IO_pos_adjust adjust an _IO_fpos_t by some number of bytes. */
 485 #ifndef _IO_pos_adjust
 486 # define _IO_pos_adjust(__pos, __delta) ((__pos) += (__delta))
 487 #endif
 488 /* _IO_pos_0 is an _IO_fpos_t value indicating beginning of file. */
 489 #ifndef _IO_pos_0
 490 # define _IO_pos_0 ((_IO_fpos_t) 0)
 491 #endif
 492
 493 #ifdef __cplusplus
 494 }
 495 #endif
 496
 497 #ifdef _IO_MTSAFE_IO
 498 /* check following! */
 499 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 500        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 501          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
 502            0, 0, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
 503 #else
 504 /* check following! */
 505 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 506        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 507            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD }
 508 #endif
 509
 510 /* VTABLE_LABEL defines NAME as of the CLASS class.
 511    CNLENGTH is strlen(#CLASS).  */
 512 #ifdef __GNUC__
 513 # if _G_VTABLE_LABEL_HAS_LENGTH
 514 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 515   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
 516 # else
 517 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 518   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
 519 # endif
 520 #endif /* __GNUC__ */
 521
 522 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
 523 # ifdef __GNUC__
 524 VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
 525 # else
 526 #  if _G_VTABLE_LABEL_HAS_LENGTH
 527 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
 528 #  else
 529 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
 530 #  endif
 531 # endif
 532 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
 533
 534 #if defined(__STDC__) || defined(__cplusplus)
 535 # define _IO_va_start(args, last) va_start(args, last)
 536 #else
 537 # define _IO_va_start(args, last) va_start(args)
 538 #endif
 539
 540 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
 541
 542 #if 1
 543 # define COERCE_FILE(FILE) /* Nothing */
 544 #else
 545 /* This is part of the kludge for binary compatibility with old stdio. */
 546 # define COERCE_FILE(FILE) \
 547   (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
 548     && (FILE) = *(FILE**)&((int*)fp)[1])
 549 #endif
 550
 551 #ifdef EINVAL
 552 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
 553 #else
 554 # define MAYBE_SET_EINVAL /* nothing */
 555 #endif
 556
 557 #ifdef IO_DEBUG
 558 # define CHECK_FILE(FILE, RET) \
 559         if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
 560         else { COERCE_FILE(FILE); \
 561                if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
 562           { MAYBE_SET_EINVAL; return RET; }}
 563 #else
 564 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)
 565 #endif