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