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 # include <bits/libc-lock.h>
  32 #else
  33 /*# include <comthread.h>*/
  34 #endif
  35
  36 #include "iolibio.h"
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 #define _IO_seek_set 0
  43 #define _IO_seek_cur 1
  44 #define _IO_seek_end 2
  45
  46 /* THE JUMPTABLE FUNCTIONS.
  47
  48  * The _IO_FILE type is used to implement the FILE type in GNU libc,
  49  * as well as the streambuf class in GNU iostreams for C++.
  50  * These are all the same, just used differently.
  51  * An _IO_FILE (or FILE) object is allows followed by a pointer to
  52  * a jump table (of pointers to functions).  The pointer is accessed
  53  * with the _IO_JUMPS macro.  The jump table has a eccentric format,
  54  * so as to be compatible with the layout of a C++ virtual function table.
  55  * (as implemented by g++).  When a pointer to a streambuf object is
  56  * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
  57  * happens to point to the virtual function table of the streambuf.
  58  * Thus the _IO_JUMPS function table used for C stdio/libio does
  59  * double duty as the virtual function table for C++ streambuf.
  60  *
  61  * The entries in the _IO_JUMPS function table (and hence also the
  62  * virtual functions of a streambuf) are described below.
  63  * The first parameter of each function entry is the _IO_FILE/streambuf
  64  * object being acted on (i.e. the 'this' parameter).
  65  */
  66
  67 #define _IO_JUMPS(THIS) ((struct _IO_FILE_plus *) (THIS))->vtable
  68 #ifdef _G_USING_THUNKS
  69 # define JUMP_FIELD(TYPE, NAME) TYPE NAME
  70 # define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC (THIS)
  71 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC (THIS, X1)
  72 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC (THIS, X1, X2)
  73 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC (THIS, X1,X2, X3)
  74 # define JUMP_INIT(NAME, VALUE) VALUE
  75 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0)
  76 #else
  77 /* These macros will change when we re-implement vtables to use "thunks"! */
  78 # define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
  79 # define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC.pfn (THIS)
  80 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1)
  81 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1, X2)
  82 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1,X2,X3)
  83 # define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
  84 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
  85 #endif
  86
  87 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
  88    It does not delete (free) it, but does everything else to finalize it/
  89    It matches the streambuf::~streambuf virtual destructor.  */
  90 typedef void (*_IO_finish_t) __P ((_IO_FILE *, int)); /* finalize */
  91 #define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
  92
  93 /* The 'overflow' hook flushes the buffer.
  94    The second argument is a character, or EOF.
  95    It matches the streambuf::overflow virtual function. */
  96 typedef int (*_IO_overflow_t) __P ((_IO_FILE *, int));
  97 #define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
  98
  99 /* The 'underflow' hook tries to fills the get buffer.
 100    It returns the next character (as an unsigned char) or EOF.  The next
 101    character remains in the get buffer, and the get position is not changed.
 102    It matches the streambuf::underflow virtual function. */
 103 typedef int (*_IO_underflow_t) __P ((_IO_FILE *));
 104 #define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
 105
 106 /* The 'uflow' hook returns the next character in the input stream
 107    (cast to unsigned char), and increments the read position;
 108    EOF is returned on failure.
 109    It matches the streambuf::uflow virtual function, which is not in the
 110    cfront implementation, but was added to C++ by the ANSI/ISO committee. */
 111 #define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
 112
 113 /* The 'pbackfail' hook handles backing up.
 114    It matches the streambuf::pbackfail virtual function. */
 115 typedef int (*_IO_pbackfail_t) __P ((_IO_FILE *, int));
 116 #define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
 117
 118 /* The 'xsputn' hook writes upto N characters from buffer DATA.
 119    Returns the number of character actually written.
 120    It matches the streambuf::xsputn virtual function. */
 121 typedef _IO_size_t (*_IO_xsputn_t) __P ((_IO_FILE *FP, const void *DATA,
 122                                          _IO_size_t N));
 123 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
 124
 125 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
 126    Returns the number of character actually read.
 127    It matches the streambuf::xsgetn virtual function. */
 128 typedef _IO_size_t (*_IO_xsgetn_t) __P ((_IO_FILE *FP, void *DATA,
 129                                          _IO_size_t N));
 130 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
 131
 132 /* The 'seekoff' hook moves the stream position to a new position
 133    relative to the start of the file (if DIR==0), the current position
 134    (MODE==1), or the end of the file (MODE==2).
 135    It matches the streambuf::seekoff virtual function.
 136    It is also used for the ANSI fseek function. */
 137 typedef _IO_fpos64_t (*_IO_seekoff_t) __P ((_IO_FILE *FP, _IO_off64_t OFF,
 138                                           int DIR, int MODE));
 139 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
 140
 141 /* The 'seekpos' hook also moves the stream position,
 142    but to an absolute position given by a fpos64_t (seekpos).
 143    It matches the streambuf::seekpos virtual function.
 144    It is also used for the ANSI fgetpos and fsetpos functions.  */
 145 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
 146 typedef _IO_fpos64_t (*_IO_seekpos_t) __P ((_IO_FILE *, _IO_fpos64_t, int));
 147 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS)
 148
 149 /* The 'setbuf' hook gives a buffer to the file.
 150    It matches the streambuf::setbuf virtual function. */
 151 typedef _IO_FILE* (*_IO_setbuf_t) __P ((_IO_FILE *, char *, _IO_ssize_t));
 152 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH)
 153
 154 /* The 'sync' hook attempts to synchronize the internal data structures
 155    of the file with the external state.
 156    It matches the streambuf::sync virtual function. */
 157 typedef int (*_IO_sync_t) __P ((_IO_FILE *));
 158 #define _IO_SYNC(FP) JUMP0 (__sync, FP)
 159
 160 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
 161    It matches the streambuf::doallocate virtual function, which is not
 162    in the ANSI/ISO C++ standard, but is part traditional implementations. */
 163 typedef int (*_IO_doallocate_t) __P ((_IO_FILE *));
 164 #define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
 165
 166 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
 167    sysstat) are low-level hooks specific to this implementation.
 168    There is no correspondence in the ANSI/ISO C++ standard library.
 169    The hooks basically correspond to the Unix system functions
 170    (read, write, close, lseek, and stat) except that a _IO_FILE*
 171    parameter is used instead of a integer file descriptor;  the default
 172    implementation used for normal files just calls those functions.
 173    The advantage of overriding these functions instead of the higher-level
 174    ones (underflow, overflow etc) is that you can leave all the buffering
 175    higher-level functions.  */
 176
 177 /* The 'sysread' hook is used to read data from the external file into
 178    an existing buffer.  It generalizes the Unix read(2) function.
 179    It matches the streambuf::sys_read virtual function, which is
 180    specific to this implementation. */
 181 typedef _IO_ssize_t (*_IO_read_t) __P ((_IO_FILE *, void *, _IO_ssize_t));
 182 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN)
 183
 184 /* The 'syswrite' hook is used to write data from an existing buffer
 185    to an external file.  It generalizes the Unix write(2) function.
 186    It matches the streambuf::sys_write virtual function, which is
 187    specific to this implementation. */
 188 typedef _IO_ssize_t (*_IO_write_t) __P ((_IO_FILE *,const void *,_IO_ssize_t));
 189 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
 190
 191 /* The 'sysseek' hook is used to re-position an external file.
 192    It generalizes the Unix lseek(2) function.
 193    It matches the streambuf::sys_seek virtual function, which is
 194    specific to this implementation. */
 195 typedef _IO_fpos64_t (*_IO_seek_t) __P ((_IO_FILE *, _IO_off64_t, int));
 196 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
 197
 198 /* The 'sysclose' hook is used to finalize (close, finish up) an
 199    external file.  It generalizes the Unix close(2) function.
 200    It matches the streambuf::sys_close virtual function, which is
 201    specific to this implementation. */
 202 typedef int (*_IO_close_t) __P ((_IO_FILE *)); /* finalize */
 203 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
 204
 205 /* The 'sysstat' hook is used to get information about an external file
 206    into a struct stat buffer.  It generalizes the Unix fstat(2) call.
 207    It matches the streambuf::sys_stat virtual function, which is
 208    specific to this implementation. */
 209 typedef int (*_IO_stat_t) __P ((_IO_FILE *, void *));
 210 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
 211
 212 /* The 'showmany' hook can be used to get an image how much input is
 213    available.  In many cases the answer will be 0 which means unknown
 214    but some cases one can provide real information.  */
 215 typedef int (*_IO_showmanyc_t) __P ((_IO_FILE *));
 216 #define _IO_SHOWMANYC(FP) JUMP0 (__showmanyc, FP)
 217
 218 /* The 'imbue' hook is used to get information about the currently
 219    installed locales.  */
 220 typedef void (*_IO_imbue_t) __P ((_IO_FILE *, void *));
 221 #define _IO_IMBUE(FP, LOCALE) JUMP1 (__imbue, FP, LOCALE)
 222
 223
 224 #define _IO_CHAR_TYPE char /* unsigned char ? */
 225 #define _IO_INT_TYPE int
 226
 227 struct _IO_jump_t
 228 {
 229     JUMP_FIELD(_G_size_t, __dummy);
 230 #ifdef _G_USING_THUNKS
 231     JUMP_FIELD(_G_size_t, __dummy2);
 232 #endif
 233     JUMP_FIELD(_IO_finish_t, __finish);
 234     JUMP_FIELD(_IO_overflow_t, __overflow);
 235     JUMP_FIELD(_IO_underflow_t, __underflow);
 236     JUMP_FIELD(_IO_underflow_t, __uflow);
 237     JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
 238     /* showmany */
 239     JUMP_FIELD(_IO_xsputn_t, __xsputn);
 240     JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
 241     JUMP_FIELD(_IO_seekoff_t, __seekoff);
 242     JUMP_FIELD(_IO_seekpos_t, __seekpos);
 243     JUMP_FIELD(_IO_setbuf_t, __setbuf);
 244     JUMP_FIELD(_IO_sync_t, __sync);
 245     JUMP_FIELD(_IO_doallocate_t, __doallocate);
 246     JUMP_FIELD(_IO_read_t, __read);
 247     JUMP_FIELD(_IO_write_t, __write);
 248     JUMP_FIELD(_IO_seek_t, __seek);
 249     JUMP_FIELD(_IO_close_t, __close);
 250     JUMP_FIELD(_IO_stat_t, __stat);
 251     JUMP_FIELD(_IO_showmanyc_t, __showmanyc);
 252     JUMP_FIELD(_IO_imbue_t, __imbue);
 253 #if 0
 254     get_column;
 255     set_column;
 256 #endif
 257 };
 258
 259 /* We always allocate an extra word following an _IO_FILE.
 260    This contains a pointer to the function jump table used.
 261    This is for compatibility with C++ streambuf; the word can
 262    be used to smash to a pointer to a virtual function table. */
 263
 264 struct _IO_FILE_plus
 265 {
 266   _IO_FILE file;
 267   const struct _IO_jump_t *vtable;
 268 };
 269
 270 /* Generic functions */
 271
 272 extern _IO_fpos64_t _IO_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 273 extern _IO_fpos64_t _IO_seekpos __P ((_IO_FILE *, _IO_fpos64_t, int));
 274
 275 extern void _IO_switch_to_main_get_area __P ((_IO_FILE *));
 276 extern void _IO_switch_to_backup_area __P ((_IO_FILE *));
 277 extern int _IO_switch_to_get_mode __P ((_IO_FILE *));
 278 extern void _IO_init __P ((_IO_FILE *, int));
 279 extern int _IO_sputbackc __P ((_IO_FILE *, int));
 280 extern int _IO_sungetc __P ((_IO_FILE *));
 281 extern void _IO_un_link __P ((_IO_FILE *));
 282 extern void _IO_link_in __P ((_IO_FILE *));
 283 extern void _IO_doallocbuf __P ((_IO_FILE *));
 284 extern void _IO_unsave_markers __P ((_IO_FILE *));
 285 extern void _IO_setb __P ((_IO_FILE *, char *, char *, int));
 286 extern unsigned _IO_adjust_column __P ((unsigned, const char *, int));
 287 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
 288
 289 /* Marker-related function. */
 290
 291 extern void _IO_init_marker __P ((struct _IO_marker *, _IO_FILE *));
 292 extern void _IO_remove_marker __P ((struct _IO_marker *));
 293 extern int _IO_marker_difference __P ((struct _IO_marker *,
 294                                        struct _IO_marker *));
 295 extern int _IO_marker_delta __P ((struct _IO_marker *));
 296 extern int _IO_seekmark __P ((_IO_FILE *, struct _IO_marker *, int));
 297
 298 /* Default jumptable functions. */
 299
 300 extern int _IO_default_underflow __P ((_IO_FILE *));
 301 extern int _IO_default_uflow __P ((_IO_FILE *));
 302 extern int _IO_default_doallocate __P ((_IO_FILE *));
 303 extern void _IO_default_finish __P ((_IO_FILE *, int));
 304 extern int _IO_default_pbackfail __P ((_IO_FILE *, int));
 305 extern _IO_FILE* _IO_default_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 306 extern _IO_size_t _IO_default_xsputn __P ((_IO_FILE *, const void *,
 307                                            _IO_size_t));
 308 extern _IO_size_t _IO_default_xsgetn __P ((_IO_FILE *, void *, _IO_size_t));
 309 extern _IO_fpos64_t _IO_default_seekoff __P ((_IO_FILE *,
 310                                               _IO_off64_t, int, int));
 311 extern _IO_fpos64_t _IO_default_seekpos __P ((_IO_FILE *,
 312                                               _IO_fpos64_t, int));
 313 extern _IO_ssize_t _IO_default_write __P ((_IO_FILE *, const void *,
 314                                            _IO_ssize_t));
 315 extern _IO_ssize_t _IO_default_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 316 extern int _IO_default_stat __P ((_IO_FILE *, void *));
 317 extern _IO_fpos64_t _IO_default_seek __P ((_IO_FILE *, _IO_off64_t, int));
 318 extern int _IO_default_sync __P ((_IO_FILE *));
 319 #define _IO_default_close ((_IO_close_t) _IO_default_sync)
 320 extern int _IO_default_showmanyc __P ((_IO_FILE *));
 321 extern void _IO_default_imbue __P ((_IO_FILE *, void *));
 322
 323 extern struct _IO_jump_t _IO_file_jumps;
 324 extern struct _IO_jump_t _IO_streambuf_jumps;
 325 extern struct _IO_jump_t _IO_proc_jumps;
 326 extern struct _IO_jump_t _IO_str_jumps;
 327 extern int _IO_do_write __P ((_IO_FILE *, const char *, _IO_size_t));
 328 extern int _IO_flush_all __P ((void));
 329 extern void _IO_cleanup __P ((void));
 330 extern void _IO_flush_all_linebuffered __P ((void));
 331
 332 #define _IO_do_flush(_f) \
 333   _IO_do_write(_f, (_f)->_IO_write_base, \
 334                (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 335 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
 336 #define _IO_mask_flags(fp, f, mask) \
 337        ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
 338 #define _IO_setg(fp, eb, g, eg)  ((fp)->_IO_read_base = (eb),\
 339         (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
 340 #define _IO_setp(__fp, __p, __ep) \
 341        ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
 342 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
 343 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
 344 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
 345 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
 346
 347 /* Jumptable functions for files. */
 348
 349 extern int _IO_file_doallocate __P ((_IO_FILE *));
 350 extern _IO_FILE* _IO_file_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 351 extern _IO_fpos64_t _IO_file_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 352 extern _IO_size_t _IO_file_xsputn __P ((_IO_FILE *, const void *, _IO_size_t));
 353 extern int _IO_file_stat __P ((_IO_FILE *, void *));
 354 extern int _IO_file_close __P ((_IO_FILE *));
 355 extern int _IO_file_underflow __P ((_IO_FILE *));
 356 extern int _IO_file_overflow __P ((_IO_FILE *, int));
 357 #define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
 358 extern void _IO_file_init __P ((_IO_FILE *));
 359 extern _IO_FILE* _IO_file_attach __P ((_IO_FILE *, int));
 360 extern _IO_FILE* _IO_file_fopen __P ((_IO_FILE *, const char *, const char *,
 361                                       int));
 362 extern _IO_ssize_t _IO_file_write __P ((_IO_FILE *, const void *,
 363                                         _IO_ssize_t));
 364 extern _IO_ssize_t _IO_file_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 365 extern int _IO_file_sync __P ((_IO_FILE *));
 366 extern int _IO_file_close_it __P ((_IO_FILE *));
 367 extern _IO_fpos64_t _IO_file_seek __P ((_IO_FILE *, _IO_off64_t, int));
 368 extern void _IO_file_finish __P ((_IO_FILE *, int));
 369
 370 /* Jumptable functions for proc_files. */
 371 extern _IO_FILE* _IO_proc_open __P ((_IO_FILE *, const char *, const char *));
 372 extern int _IO_proc_close __P ((_IO_FILE *));
 373
 374 /* Jumptable functions for strfiles. */
 375 extern int _IO_str_underflow __P ((_IO_FILE *));
 376 extern int _IO_str_overflow __P ((_IO_FILE *, int));
 377 extern int _IO_str_pbackfail __P ((_IO_FILE *, int));
 378 extern _IO_fpos64_t _IO_str_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 379 extern void _IO_str_finish __P ((_IO_FILE *, int));
 380
 381 /* Other strfile functions */
 382 extern void _IO_str_init_static __P ((_IO_FILE *, char *, int, char *));
 383 extern void _IO_str_init_readonly __P ((_IO_FILE *, const char *, int));
 384 extern _IO_ssize_t _IO_str_count __P ((_IO_FILE *));
 385
 386 extern int _IO_vasprintf __P ((char **result_ptr, __const char *format,
 387                                _IO_va_list args));
 388 extern int _IO_vdprintf __P ((int d, __const char *format, _IO_va_list arg));
 389 extern int _IO_vsnprintf __P ((char *string, _IO_size_t maxlen,
 390                                __const char *format, _IO_va_list args));
 391
 392
 393 extern _IO_size_t _IO_getline __P ((_IO_FILE *,char *, _IO_size_t, int, int));
 394 extern _IO_ssize_t _IO_getdelim __P ((char **, _IO_size_t *, int, _IO_FILE *));
 395 extern double _IO_strtod __P ((const char *, char **));
 396 extern char *_IO_dtoa __P ((double __d, int __mode, int __ndigits,
 397                             int *__decpt, int *__sign, char **__rve));
 398 extern int _IO_outfloat __P ((double __value, _IO_FILE *__sb, int __type,
 399                               int __width, int __precision, int __flags,
 400                               int __sign_mode, int __fill));
 401
 402 extern _IO_FILE *_IO_list_all;
 403 extern void (*_IO_cleanup_registration_needed) __P ((void));
 404
 405 #ifndef EOF
 406 # define EOF (-1)
 407 #endif
 408 #ifndef NULL
 409 # if defined __GNUG__ && \
 410     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
 411 #  define NULL (__null)
 412 # else
 413 #  if !defined(__cplusplus)
 414 #   define NULL ((void*)0)
 415 #  else
 416 #   define NULL (0)
 417 #  endif
 418 # endif
 419 #endif
 420
 421 #if _G_HAVE_MMAP
 422
 423 # include <unistd.h>
 424 # include <fcntl.h>
 425 # include <sys/mman.h>
 426 # include <sys/param.h>
 427
 428 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 429 #  define MAP_ANONYMOUS MAP_ANON
 430 # endif
 431
 432 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
 433 #  undef _G_HAVE_MMAP
 434 #  define _G_HAVE_MMAP 0
 435 # endif
 436
 437 #endif /* _G_HAVE_MMAP */
 438
 439 #if _G_HAVE_MMAP
 440
 441 # ifdef _LIBC
 442 /* When using this code in the GNU libc we must not pollute the name space.  */
 443 #  define mmap __mmap
 444 #  define munmap __munmap
 445 #  define ftruncate __ftruncate
 446 # endif
 447
 448 # define ROUND_TO_PAGE(_S) \
 449        (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
 450
 451 # define FREE_BUF(_B, _S) \
 452        munmap ((_B), ROUND_TO_PAGE (_S))
 453 # define ALLOC_BUF(_B, _S, _R) \
 454        do {                                                                   \
 455           (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S),                        \
 456                                 PROT_READ | PROT_WRITE,                       \
 457                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);          \
 458           if ((_B) == (char *) -1)                                            \
 459             return (_R);                                                      \
 460        } while (0)
 461
 462 #else /* _G_HAVE_MMAP */
 463
 464 # define FREE_BUF(_B, _S) \
 465        free(_B)
 466 # define ALLOC_BUF(_B, _S, _R) \
 467        do {                                                                   \
 468           (_B) = (char*)malloc(_S);                                           \
 469           if ((_B) == NULL)                                                   \
 470             return (_R);                                                      \
 471        } while (0)
 472
 473 #endif /* _G_HAVE_MMAP */
 474
 475 #ifndef OS_FSTAT
 476 # define OS_FSTAT fstat
 477 #endif
 478 struct stat;
 479 extern _IO_ssize_t _IO_read __P ((int, void *, _IO_size_t));
 480 extern _IO_ssize_t _IO_write __P ((int, const void *, _IO_size_t));
 481 extern _IO_off64_t _IO_lseek __P ((int, _IO_off64_t, int));
 482 extern int _IO_close __P ((int));
 483 extern int _IO_fstat __P ((int, struct stat *));
 484 extern int _IO_vscanf __P ((const char *, _IO_va_list));
 485
 486 /* Operations on _IO_fpos64_t.
 487    Normally, these are trivial, but we provide hooks for configurations
 488    where an _IO_fpos64_t is a struct.
 489    Note that _IO_off64_t must be an integral type. */
 490
 491 /* _IO_pos_BAD is an _IO_fpos64_t value indicating error, unknown, or EOF. */
 492 #ifndef _IO_pos_BAD
 493 # define _IO_pos_BAD ((_IO_fpos64_t) -1)
 494 #endif
 495 /* _IO_pos_as_off converts an _IO_fpos64_t value to an _IO_off64_t value. */
 496 #ifndef _IO_pos_as_off
 497 # define _IO_pos_as_off(__pos) ((_IO_off64_t) (__pos))
 498 #endif
 499 /* _IO_pos_adjust adjust an _IO_fpos64_t by some number of bytes. */
 500 #ifndef _IO_pos_adjust
 501 # define _IO_pos_adjust(__pos, __delta) ((__pos) += (__delta))
 502 #endif
 503 /* _IO_pos_0 is an _IO_fpos64_t value indicating beginning of file. */
 504 #ifndef _IO_pos_0
 505 # define _IO_pos_0 ((_IO_fpos64_t) 0)
 506 #endif
 507
 508 #ifdef __cplusplus
 509 }
 510 #endif
 511
 512 #ifdef _IO_MTSAFE_IO
 513 /* check following! */
 514 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 515        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 516          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
 517            0, 0, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
 518 #else
 519 /* check following! */
 520 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 521        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 522            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD }
 523 #endif
 524
 525 /* VTABLE_LABEL defines NAME as of the CLASS class.
 526    CNLENGTH is strlen(#CLASS).  */
 527 #ifdef __GNUC__
 528 # if _G_VTABLE_LABEL_HAS_LENGTH
 529 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 530   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
 531 # else
 532 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 533   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
 534 # endif
 535 #endif /* __GNUC__ */
 536
 537 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
 538 # ifdef __GNUC__
 539 VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
 540 # else
 541 #  if _G_VTABLE_LABEL_HAS_LENGTH
 542 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
 543 #  else
 544 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
 545 #  endif
 546 # endif
 547 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
 548
 549 #if defined(__STDC__) || defined(__cplusplus)
 550 # define _IO_va_start(args, last) va_start(args, last)
 551 #else
 552 # define _IO_va_start(args, last) va_start(args)
 553 #endif
 554
 555 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
 556
 557 #if 1
 558 # define COERCE_FILE(FILE) /* Nothing */
 559 #else
 560 /* This is part of the kludge for binary compatibility with old stdio. */
 561 # define COERCE_FILE(FILE) \
 562   (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
 563     && (FILE) = *(FILE**)&((int*)fp)[1])
 564 #endif
 565
 566 #ifdef EINVAL
 567 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
 568 #else
 569 # define MAYBE_SET_EINVAL /* nothing */
 570 #endif
 571
 572 #ifdef IO_DEBUG
 573 # define CHECK_FILE(FILE, RET) \
 574         if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
 575         else { COERCE_FILE(FILE); \
 576                if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
 577           { MAYBE_SET_EINVAL; return RET; }}
 578 #else
 579 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)
 580 #endif