libio/libioP.h

   1 /* Copyright (C) 1993, 1997, 1998 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 #if (!defined _IO_USE_OLD_IO_FILE \
  68      && (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0))
  69 # define _IO_JUMPS_OFFSET 1
  70 #endif
  71
  72 #define _IO_JUMPS(THIS) ((struct _IO_FILE_plus *) (THIS))->vtable
  73 #if _IO_JUMPS_OFFSET
  74 # define _IO_JUMPS_FUNC(THIS) \
  75  (*(struct _IO_jump_t **) ((void *) &((struct _IO_FILE_plus *) (THIS))->vtable\
  76                            + (THIS)->_vtable_offset))
  77 #else
  78 # define _IO_JUMPS_FUNC(THIS) _IO_JUMPS(THIS)
  79 #endif
  80 #ifdef _G_USING_THUNKS
  81 # define JUMP_FIELD(TYPE, NAME) TYPE NAME
  82 # define JUMP0(FUNC, THIS) _IO_JUMPS_FUNC(THIS)->FUNC (THIS)
  83 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS_FUNC(THIS)->FUNC (THIS, X1)
  84 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS_FUNC(THIS)->FUNC (THIS, X1, X2)
  85 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS_FUNC(THIS)->FUNC (THIS, X1,X2, X3)
  86 # define JUMP_INIT(NAME, VALUE) VALUE
  87 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0)
  88 #else
  89 /* These macros will change when we re-implement vtables to use "thunks"! */
  90 # define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
  91 # define JUMP0(FUNC, THIS) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS)
  92 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1)
  93 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1, X2)
  94 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1,X2,X3)
  95 # define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
  96 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
  97 #endif
  98
  99 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
 100    It does not delete (free) it, but does everything else to finalize it/
 101    It matches the streambuf::~streambuf virtual destructor.  */
 102 typedef void (*_IO_finish_t) __PMT ((_IO_FILE *, int)); /* finalize */
 103 #define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
 104
 105 /* The 'overflow' hook flushes the buffer.
 106    The second argument is a character, or EOF.
 107    It matches the streambuf::overflow virtual function. */
 108 typedef int (*_IO_overflow_t) __PMT ((_IO_FILE *, int));
 109 #define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
 110
 111 /* The 'underflow' hook tries to fills the get buffer.
 112    It returns the next character (as an unsigned char) or EOF.  The next
 113    character remains in the get buffer, and the get position is not changed.
 114    It matches the streambuf::underflow virtual function. */
 115 typedef int (*_IO_underflow_t) __PMT ((_IO_FILE *));
 116 #define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
 117
 118 /* The 'uflow' hook returns the next character in the input stream
 119    (cast to unsigned char), and increments the read position;
 120    EOF is returned on failure.
 121    It matches the streambuf::uflow virtual function, which is not in the
 122    cfront implementation, but was added to C++ by the ANSI/ISO committee. */
 123 #define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
 124
 125 /* The 'pbackfail' hook handles backing up.
 126    It matches the streambuf::pbackfail virtual function. */
 127 typedef int (*_IO_pbackfail_t) __PMT ((_IO_FILE *, int));
 128 #define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
 129
 130 /* The 'xsputn' hook writes upto N characters from buffer DATA.
 131    Returns the number of character actually written.
 132    It matches the streambuf::xsputn virtual function. */
 133 typedef _IO_size_t (*_IO_xsputn_t) __PMT ((_IO_FILE *FP, const void *DATA,
 134                                            _IO_size_t N));
 135 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
 136
 137 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
 138    Returns the number of character actually read.
 139    It matches the streambuf::xsgetn virtual function. */
 140 typedef _IO_size_t (*_IO_xsgetn_t) __PMT ((_IO_FILE *FP, void *DATA,
 141                                            _IO_size_t N));
 142 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
 143
 144 /* The 'seekoff' hook moves the stream position to a new position
 145    relative to the start of the file (if DIR==0), the current position
 146    (MODE==1), or the end of the file (MODE==2).
 147    It matches the streambuf::seekoff virtual function.
 148    It is also used for the ANSI fseek function. */
 149 typedef _IO_fpos64_t (*_IO_seekoff_t) __PMT ((_IO_FILE *FP, _IO_off64_t OFF,
 150                                               int DIR, int MODE));
 151 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
 152
 153 /* The 'seekpos' hook also moves the stream position,
 154    but to an absolute position given by a fpos64_t (seekpos).
 155    It matches the streambuf::seekpos virtual function.
 156    It is also used for the ANSI fgetpos and fsetpos functions.  */
 157 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
 158 typedef _IO_fpos64_t (*_IO_seekpos_t) __PMT ((_IO_FILE *, _IO_fpos64_t, int));
 159 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS)
 160
 161 /* The 'setbuf' hook gives a buffer to the file.
 162    It matches the streambuf::setbuf virtual function. */
 163 typedef _IO_FILE* (*_IO_setbuf_t) __PMT ((_IO_FILE *, char *, _IO_ssize_t));
 164 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH)
 165
 166 /* The 'sync' hook attempts to synchronize the internal data structures
 167    of the file with the external state.
 168    It matches the streambuf::sync virtual function. */
 169 typedef int (*_IO_sync_t) __PMT ((_IO_FILE *));
 170 #define _IO_SYNC(FP) JUMP0 (__sync, FP)
 171
 172 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
 173    It matches the streambuf::doallocate virtual function, which is not
 174    in the ANSI/ISO C++ standard, but is part traditional implementations. */
 175 typedef int (*_IO_doallocate_t) __PMT ((_IO_FILE *));
 176 #define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
 177
 178 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
 179    sysstat) are low-level hooks specific to this implementation.
 180    There is no correspondence in the ANSI/ISO C++ standard library.
 181    The hooks basically correspond to the Unix system functions
 182    (read, write, close, lseek, and stat) except that a _IO_FILE*
 183    parameter is used instead of a integer file descriptor;  the default
 184    implementation used for normal files just calls those functions.
 185    The advantage of overriding these functions instead of the higher-level
 186    ones (underflow, overflow etc) is that you can leave all the buffering
 187    higher-level functions.  */
 188
 189 /* The 'sysread' hook is used to read data from the external file into
 190    an existing buffer.  It generalizes the Unix read(2) function.
 191    It matches the streambuf::sys_read virtual function, which is
 192    specific to this implementation. */
 193 typedef _IO_ssize_t (*_IO_read_t) __PMT ((_IO_FILE *, void *, _IO_ssize_t));
 194 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN)
 195
 196 /* The 'syswrite' hook is used to write data from an existing buffer
 197    to an external file.  It generalizes the Unix write(2) function.
 198    It matches the streambuf::sys_write virtual function, which is
 199    specific to this implementation. */
 200 typedef _IO_ssize_t (*_IO_write_t) __PMT ((_IO_FILE *, const void *,
 201                                            _IO_ssize_t));
 202 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
 203
 204 /* The 'sysseek' hook is used to re-position an external file.
 205    It generalizes the Unix lseek(2) function.
 206    It matches the streambuf::sys_seek virtual function, which is
 207    specific to this implementation. */
 208 typedef _IO_fpos64_t (*_IO_seek_t) __PMT ((_IO_FILE *, _IO_off64_t, int));
 209 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
 210
 211 /* The 'sysclose' hook is used to finalize (close, finish up) an
 212    external file.  It generalizes the Unix close(2) function.
 213    It matches the streambuf::sys_close virtual function, which is
 214    specific to this implementation. */
 215 typedef int (*_IO_close_t) __PMT ((_IO_FILE *)); /* finalize */
 216 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
 217
 218 /* The 'sysstat' hook is used to get information about an external file
 219    into a struct stat buffer.  It generalizes the Unix fstat(2) call.
 220    It matches the streambuf::sys_stat virtual function, which is
 221    specific to this implementation. */
 222 typedef int (*_IO_stat_t) __PMT ((_IO_FILE *, void *));
 223 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
 224
 225 /* The 'showmany' hook can be used to get an image how much input is
 226    available.  In many cases the answer will be 0 which means unknown
 227    but some cases one can provide real information.  */
 228 typedef int (*_IO_showmanyc_t) __PMT ((_IO_FILE *));
 229 #define _IO_SHOWMANYC(FP) JUMP0 (__showmanyc, FP)
 230
 231 /* The 'imbue' hook is used to get information about the currently
 232    installed locales.  */
 233 typedef void (*_IO_imbue_t) __PMT ((_IO_FILE *, void *));
 234 #define _IO_IMBUE(FP, LOCALE) JUMP1 (__imbue, FP, LOCALE)
 235
 236
 237 #define _IO_CHAR_TYPE char /* unsigned char ? */
 238 #define _IO_INT_TYPE int
 239
 240 struct _IO_jump_t
 241 {
 242     JUMP_FIELD(_G_size_t, __dummy);
 243 #ifdef _G_USING_THUNKS
 244     JUMP_FIELD(_G_size_t, __dummy2);
 245 #endif
 246     JUMP_FIELD(_IO_finish_t, __finish);
 247     JUMP_FIELD(_IO_overflow_t, __overflow);
 248     JUMP_FIELD(_IO_underflow_t, __underflow);
 249     JUMP_FIELD(_IO_underflow_t, __uflow);
 250     JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
 251     /* showmany */
 252     JUMP_FIELD(_IO_xsputn_t, __xsputn);
 253     JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
 254     JUMP_FIELD(_IO_seekoff_t, __seekoff);
 255     JUMP_FIELD(_IO_seekpos_t, __seekpos);
 256     JUMP_FIELD(_IO_setbuf_t, __setbuf);
 257     JUMP_FIELD(_IO_sync_t, __sync);
 258     JUMP_FIELD(_IO_doallocate_t, __doallocate);
 259     JUMP_FIELD(_IO_read_t, __read);
 260     JUMP_FIELD(_IO_write_t, __write);
 261     JUMP_FIELD(_IO_seek_t, __seek);
 262     JUMP_FIELD(_IO_close_t, __close);
 263     JUMP_FIELD(_IO_stat_t, __stat);
 264     JUMP_FIELD(_IO_showmanyc_t, __showmanyc);
 265     JUMP_FIELD(_IO_imbue_t, __imbue);
 266 #if 0
 267     get_column;
 268     set_column;
 269 #endif
 270 };
 271
 272 /* We always allocate an extra word following an _IO_FILE.
 273    This contains a pointer to the function jump table used.
 274    This is for compatibility with C++ streambuf; the word can
 275    be used to smash to a pointer to a virtual function table. */
 276
 277 struct _IO_FILE_plus
 278 {
 279   _IO_FILE file;
 280   const struct _IO_jump_t *vtable;
 281 };
 282
 283 /* Generic functions */
 284
 285 extern _IO_fpos64_t _IO_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 286 extern _IO_fpos64_t _IO_seekpos __P ((_IO_FILE *, _IO_fpos64_t, int));
 287
 288 extern void _IO_switch_to_main_get_area __P ((_IO_FILE *));
 289 extern void _IO_switch_to_backup_area __P ((_IO_FILE *));
 290 extern int _IO_switch_to_get_mode __P ((_IO_FILE *));
 291 extern void _IO_init __P ((_IO_FILE *, int));
 292 extern int _IO_sputbackc __P ((_IO_FILE *, int));
 293 extern int _IO_sungetc __P ((_IO_FILE *));
 294 extern void _IO_un_link __P ((_IO_FILE *));
 295 extern void _IO_link_in __P ((_IO_FILE *));
 296 extern void _IO_doallocbuf __P ((_IO_FILE *));
 297 extern void _IO_unsave_markers __P ((_IO_FILE *));
 298 extern void _IO_setb __P ((_IO_FILE *, char *, char *, int));
 299 extern unsigned _IO_adjust_column __P ((unsigned, const char *, int));
 300 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
 301
 302 /* Marker-related function. */
 303
 304 extern void _IO_init_marker __P ((struct _IO_marker *, _IO_FILE *));
 305 extern void _IO_remove_marker __P ((struct _IO_marker *));
 306 extern int _IO_marker_difference __P ((struct _IO_marker *,
 307                                        struct _IO_marker *));
 308 extern int _IO_marker_delta __P ((struct _IO_marker *));
 309 extern int _IO_seekmark __P ((_IO_FILE *, struct _IO_marker *, int));
 310
 311 /* Default jumptable functions. */
 312
 313 extern int _IO_default_underflow __P ((_IO_FILE *));
 314 extern int _IO_default_uflow __P ((_IO_FILE *));
 315 extern int _IO_default_doallocate __P ((_IO_FILE *));
 316 extern void _IO_default_finish __P ((_IO_FILE *, int));
 317 extern int _IO_default_pbackfail __P ((_IO_FILE *, int));
 318 extern _IO_FILE* _IO_default_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 319 extern _IO_size_t _IO_default_xsputn __P ((_IO_FILE *, const void *,
 320                                            _IO_size_t));
 321 extern _IO_size_t _IO_default_xsgetn __P ((_IO_FILE *, void *, _IO_size_t));
 322 extern _IO_fpos64_t _IO_default_seekoff __P ((_IO_FILE *,
 323                                               _IO_off64_t, int, int));
 324 extern _IO_fpos64_t _IO_default_seekpos __P ((_IO_FILE *,
 325                                               _IO_fpos64_t, int));
 326 extern _IO_ssize_t _IO_default_write __P ((_IO_FILE *, const void *,
 327                                            _IO_ssize_t));
 328 extern _IO_ssize_t _IO_default_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 329 extern int _IO_default_stat __P ((_IO_FILE *, void *));
 330 extern _IO_fpos64_t _IO_default_seek __P ((_IO_FILE *, _IO_off64_t, int));
 331 extern int _IO_default_sync __P ((_IO_FILE *));
 332 #define _IO_default_close ((_IO_close_t) _IO_default_sync)
 333 extern int _IO_default_showmanyc __P ((_IO_FILE *));
 334 extern void _IO_default_imbue __P ((_IO_FILE *, void *));
 335
 336 extern struct _IO_jump_t _IO_file_jumps;
 337 extern struct _IO_jump_t _IO_new_file_jumps;
 338 extern struct _IO_jump_t _IO_old_file_jumps;
 339 extern struct _IO_jump_t _IO_streambuf_jumps;
 340 extern struct _IO_jump_t _IO_proc_jumps;
 341 extern struct _IO_jump_t _IO_str_jumps;
 342 extern int _IO_do_write __P ((_IO_FILE *, const char *, _IO_size_t));
 343 extern int _IO_old_do_write __P ((_IO_FILE *, const char *, _IO_size_t));
 344 extern int _IO_flush_all __P ((void));
 345 extern int _IO_cleanup __P ((void));
 346 extern void _IO_flush_all_linebuffered __P ((void));
 347
 348 #define _IO_do_flush(_f) \
 349   _IO_do_write(_f, (_f)->_IO_write_base, \
 350                (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 351 #define _IO_old_do_flush(_f) \
 352   _IO_old_do_write(_f, (_f)->_IO_write_base, \
 353                    (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 354 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
 355 #define _IO_mask_flags(fp, f, mask) \
 356        ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
 357 #define _IO_setg(fp, eb, g, eg)  ((fp)->_IO_read_base = (eb),\
 358         (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
 359 #define _IO_setp(__fp, __p, __ep) \
 360        ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
 361 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
 362 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
 363 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
 364 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
 365
 366 /* Jumptable functions for files. */
 367
 368 extern int _IO_file_doallocate __P ((_IO_FILE *));
 369 extern _IO_FILE* _IO_file_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 370 extern _IO_fpos64_t _IO_file_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 371 extern _IO_size_t _IO_file_xsputn __P ((_IO_FILE *, const void *, _IO_size_t));
 372 extern _IO_size_t _IO_file_xsgetn __P ((_IO_FILE *, void *, _IO_size_t));
 373 extern int _IO_file_stat __P ((_IO_FILE *, void *));
 374 extern int _IO_file_close __P ((_IO_FILE *));
 375 extern int _IO_file_underflow __P ((_IO_FILE *));
 376 extern int _IO_file_overflow __P ((_IO_FILE *, int));
 377 #define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
 378 extern void _IO_file_init __P ((_IO_FILE *));
 379 extern _IO_FILE* _IO_file_attach __P ((_IO_FILE *, int));
 380 extern _IO_FILE* _IO_file_open __P ((_IO_FILE *, const char *, int, int,
 381                                      int, int));
 382 extern _IO_FILE* _IO_file_fopen __P ((_IO_FILE *, const char *, const char *,
 383                                       int));
 384 extern _IO_ssize_t _IO_file_write __P ((_IO_FILE *, const void *,
 385                                         _IO_ssize_t));
 386 extern _IO_ssize_t _IO_file_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 387 extern int _IO_file_sync __P ((_IO_FILE *));
 388 extern int _IO_file_close_it __P ((_IO_FILE *));
 389 extern _IO_fpos64_t _IO_file_seek __P ((_IO_FILE *, _IO_off64_t, int));
 390 extern void _IO_file_finish __P ((_IO_FILE *, int));
 391
 392 extern _IO_FILE* _IO_old_file_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 393 extern _IO_fpos64_t _IO_old_file_seekoff __P ((_IO_FILE *, _IO_off64_t, int,
 394                                                int));
 395 extern _IO_size_t _IO_old_file_xsputn __P ((_IO_FILE *, const void *,
 396                                             _IO_size_t));
 397 extern int _IO_old_file_underflow __P ((_IO_FILE *));
 398 extern int _IO_old_file_overflow __P ((_IO_FILE *, int));
 399 extern void _IO_old_file_init __P ((_IO_FILE *));
 400 extern _IO_FILE* _IO_old_file_attach __P ((_IO_FILE *, int));
 401 extern _IO_FILE* _IO_old_file_fopen __P ((_IO_FILE *, const char *,
 402                                           const char *));
 403 extern _IO_ssize_t _IO_old_file_write __P ((_IO_FILE *, const void *,
 404                                             _IO_ssize_t));
 405 extern int _IO_old_file_sync __P ((_IO_FILE *));
 406 extern int _IO_old_file_close_it __P ((_IO_FILE *));
 407 extern void _IO_old_file_finish __P ((_IO_FILE *, int));
 408
 409 /* Jumptable functions for proc_files. */
 410 extern _IO_FILE* _IO_proc_open __P ((_IO_FILE *, const char *, const char *));
 411 extern int _IO_proc_close __P ((_IO_FILE *));
 412
 413 /* Jumptable functions for strfiles. */
 414 extern int _IO_str_underflow __P ((_IO_FILE *));
 415 extern int _IO_str_overflow __P ((_IO_FILE *, int));
 416 extern int _IO_str_pbackfail __P ((_IO_FILE *, int));
 417 extern _IO_fpos64_t _IO_str_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 418 extern void _IO_str_finish __P ((_IO_FILE *, int));
 419
 420 /* Other strfile functions */
 421 extern void _IO_str_init_static __P ((_IO_FILE *, char *, int, char *));
 422 extern void _IO_str_init_readonly __P ((_IO_FILE *, const char *, int));
 423 extern _IO_ssize_t _IO_str_count __P ((_IO_FILE *));
 424
 425 extern int _IO_vasprintf __P ((char **result_ptr, __const char *format,
 426                                _IO_va_list args));
 427 extern int _IO_vdprintf __P ((int d, __const char *format, _IO_va_list arg));
 428 extern int _IO_vsnprintf __P ((char *string, _IO_size_t maxlen,
 429                                __const char *format, _IO_va_list args));
 430
 431
 432 extern _IO_size_t _IO_getline __P ((_IO_FILE *,char *, _IO_size_t, int, int));
 433 extern _IO_size_t _IO_getline_info __P ((_IO_FILE *,char *, _IO_size_t,
 434                                          int, int, int *));
 435 extern _IO_ssize_t _IO_getdelim __P ((char **, _IO_size_t *, int, _IO_FILE *));
 436 extern double _IO_strtod __P ((const char *, char **));
 437 extern char *_IO_dtoa __P ((double __d, int __mode, int __ndigits,
 438                             int *__decpt, int *__sign, char **__rve));
 439 extern int _IO_outfloat __P ((double __value, _IO_FILE *__sb, int __type,
 440                               int __width, int __precision, int __flags,
 441                               int __sign_mode, int __fill));
 442
 443 extern _IO_FILE *_IO_list_all;
 444 extern void (*_IO_cleanup_registration_needed) __PMT ((void));
 445
 446 #ifndef EOF
 447 # define EOF (-1)
 448 #endif
 449 #ifndef NULL
 450 # if defined __GNUG__ && \
 451     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
 452 #  define NULL (__null)
 453 # else
 454 #  if !defined(__cplusplus)
 455 #   define NULL ((void*)0)
 456 #  else
 457 #   define NULL (0)
 458 #  endif
 459 # endif
 460 #endif
 461
 462 #if _G_HAVE_MMAP
 463
 464 # include <unistd.h>
 465 # include <fcntl.h>
 466 # include <sys/mman.h>
 467 # include <sys/param.h>
 468
 469 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 470 #  define MAP_ANONYMOUS MAP_ANON
 471 # endif
 472
 473 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
 474 #  undef _G_HAVE_MMAP
 475 #  define _G_HAVE_MMAP 0
 476 # endif
 477
 478 #endif /* _G_HAVE_MMAP */
 479
 480 #if _G_HAVE_MMAP
 481
 482 # ifdef _LIBC
 483 /* When using this code in the GNU libc we must not pollute the name space.  */
 484 #  define mmap __mmap
 485 #  define munmap __munmap
 486 #  define ftruncate __ftruncate
 487 # endif
 488
 489 # define ROUND_TO_PAGE(_S) \
 490        (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
 491
 492 # define FREE_BUF(_B, _S) \
 493        munmap ((_B), ROUND_TO_PAGE (_S))
 494 # define ALLOC_BUF(_B, _S, _R) \
 495        do {                                                                   \
 496           (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S),                        \
 497                                 PROT_READ | PROT_WRITE,                       \
 498                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);          \
 499           if ((_B) == (char *) -1)                                            \
 500             return (_R);                                                      \
 501        } while (0)
 502
 503 #else /* _G_HAVE_MMAP */
 504
 505 # define FREE_BUF(_B, _S) \
 506        free(_B)
 507 # define ALLOC_BUF(_B, _S, _R) \
 508        do {                                                                   \
 509           (_B) = (char*)malloc(_S);                                           \
 510           if ((_B) == NULL)                                                   \
 511             return (_R);                                                      \
 512        } while (0)
 513
 514 #endif /* _G_HAVE_MMAP */
 515
 516 #ifndef OS_FSTAT
 517 # define OS_FSTAT fstat
 518 #endif
 519 struct stat;
 520 extern _IO_ssize_t _IO_read __P ((int, void *, _IO_size_t));
 521 extern _IO_ssize_t _IO_write __P ((int, const void *, _IO_size_t));
 522 extern _IO_off64_t _IO_lseek __P ((int, _IO_off64_t, int));
 523 extern int _IO_close __P ((int));
 524 extern int _IO_fstat __P ((int, struct stat *));
 525 extern int _IO_vscanf __P ((const char *, _IO_va_list));
 526
 527 /* Operations on _IO_fpos64_t.
 528    Normally, these are trivial, but we provide hooks for configurations
 529    where an _IO_fpos64_t is a struct.
 530    Note that _IO_off64_t must be an integral type. */
 531
 532 /* _IO_pos_BAD is an _IO_fpos64_t value indicating error, unknown, or EOF. */
 533 #ifndef _IO_pos_BAD
 534 # define _IO_pos_BAD ((_IO_fpos64_t) -1)
 535 #endif
 536 /* _IO_pos_as_off converts an _IO_fpos64_t value to an _IO_off64_t value. */
 537 #ifndef _IO_pos_as_off
 538 # define _IO_pos_as_off(__pos) ((_IO_off64_t) (__pos))
 539 #endif
 540 /* _IO_pos_adjust adjust an _IO_fpos64_t by some number of bytes. */
 541 #ifndef _IO_pos_adjust
 542 # define _IO_pos_adjust(__pos, __delta) ((__pos) += (__delta))
 543 #endif
 544 /* _IO_pos_0 is an _IO_fpos64_t value indicating beginning of file. */
 545 #ifndef _IO_pos_0
 546 # define _IO_pos_0 ((_IO_fpos64_t) 0)
 547 #endif
 548
 549 #ifdef __cplusplus
 550 }
 551 #endif
 552
 553 #ifdef _IO_MTSAFE_IO
 554 /* check following! */
 555 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 556        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 557          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
 558            0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
 559 #else
 560 /* check following! */
 561 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 562        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 563            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, 0, _IO_pos_BAD }
 564 #endif
 565
 566 /* VTABLE_LABEL defines NAME as of the CLASS class.
 567    CNLENGTH is strlen(#CLASS).  */
 568 #ifdef __GNUC__
 569 # if _G_VTABLE_LABEL_HAS_LENGTH
 570 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 571   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
 572 # else
 573 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 574   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
 575 # endif
 576 #endif /* __GNUC__ */
 577
 578 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
 579 # ifdef __GNUC__
 580 VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
 581 # else
 582 #  if _G_VTABLE_LABEL_HAS_LENGTH
 583 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
 584 #  else
 585 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
 586 #  endif
 587 # endif
 588 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
 589
 590 #if defined(__STDC__) || defined(__cplusplus)
 591 # define _IO_va_start(args, last) va_start(args, last)
 592 #else
 593 # define _IO_va_start(args, last) va_start(args)
 594 #endif
 595
 596 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
 597
 598 #if 1
 599 # define COERCE_FILE(FILE) /* Nothing */
 600 #else
 601 /* This is part of the kludge for binary compatibility with old stdio. */
 602 # define COERCE_FILE(FILE) \
 603   (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
 604     && (FILE) = *(FILE**)&((int*)fp)[1])
 605 #endif
 606
 607 #ifdef EINVAL
 608 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
 609 #else
 610 # define MAYBE_SET_EINVAL /* nothing */
 611 #endif
 612
 613 #ifdef IO_DEBUG
 614 # define CHECK_FILE(FILE, RET) \
 615         if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
 616         else { COERCE_FILE(FILE); \
 617                if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
 618           { MAYBE_SET_EINVAL; return RET; }}
 619 #else
 620 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)
 621 #endif