libio/libioP.h

   1 /* Copyright (C) 1993, 1997-2003,2004,2005,2006,2007,2012
   2         Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.
  19
  20    As a special exception, if you link the code in this file with
  21    files compiled with a GNU compiler to produce an executable,
  22    that does not cause the resulting executable to be covered by
  23    the GNU Lesser General Public License.  This exception does not
  24    however invalidate any other reasons why the executable file
  25    might be covered by the GNU Lesser General Public License.
  26    This exception applies to code released by its copyright holders
  27    in files containing the exception.  */
  28
  29 #include <errno.h>
  30 #ifndef __set_errno
  31 # define __set_errno(Val) errno = (Val)
  32 #endif
  33 #if defined __GLIBC__ && __GLIBC__ >= 2
  34 # include <bits/libc-lock.h>
  35 #else
  36 /*# include <comthread.h>*/
  37 #endif
  38
  39 #include <math_ldbl_opt.h>
  40
  41 #include "iolibio.h"
  42
  43 /* Control of exported symbols.  Used in glibc.  By default we don't
  44    do anything.  */
  45 #ifndef INTUSE
  46 # define INTUSE(name) name
  47 #endif
  48 #ifndef INTDEF
  49 # define INTDEF(name)
  50 #endif
  51 #ifndef INTDEF2
  52 # define INTDEF2(name)
  53 #endif
  54 #ifndef libc_hidden_proto
  55 # define libc_hidden_proto(name)
  56 #endif
  57 #ifndef libc_hidden_def
  58 # define libc_hidden_def(name)
  59 #endif
  60 #ifndef libc_hidden_weak
  61 # define libc_hidden_weak(name)
  62 #endif
  63
  64 #ifdef __cplusplus
  65 extern "C" {
  66 #endif
  67
  68 #define _IO_seek_set 0
  69 #define _IO_seek_cur 1
  70 #define _IO_seek_end 2
  71
  72 /* THE JUMPTABLE FUNCTIONS.
  73
  74  * The _IO_FILE type is used to implement the FILE type in GNU libc,
  75  * as well as the streambuf class in GNU iostreams for C++.
  76  * These are all the same, just used differently.
  77  * An _IO_FILE (or FILE) object is allows followed by a pointer to
  78  * a jump table (of pointers to functions).  The pointer is accessed
  79  * with the _IO_JUMPS macro.  The jump table has a eccentric format,
  80  * so as to be compatible with the layout of a C++ virtual function table.
  81  * (as implemented by g++).  When a pointer to a streambuf object is
  82  * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
  83  * happens to point to the virtual function table of the streambuf.
  84  * Thus the _IO_JUMPS function table used for C stdio/libio does
  85  * double duty as the virtual function table for C++ streambuf.
  86  *
  87  * The entries in the _IO_JUMPS function table (and hence also the
  88  * virtual functions of a streambuf) are described below.
  89  * The first parameter of each function entry is the _IO_FILE/streambuf
  90  * object being acted on (i.e. the 'this' parameter).
  91  */
  92
  93 #ifdef _LIBC
  94 # include <shlib-compat.h>
  95 # if !SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
  96    /* Setting this macro disables the use of the _vtable_offset
  97       bias in _IO_JUMPS_FUNCS, below.  That is only needed if we
  98       want to support old binaries (see oldfileops.c).  */
  99 #  define _G_IO_NO_BACKWARD_COMPAT 1
 100 # endif
 101 #endif
 102
 103 #if (!defined _IO_USE_OLD_IO_FILE \
 104      && (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0))
 105 # define _IO_JUMPS_OFFSET 1
 106 #endif
 107
 108 #define _IO_JUMPS(THIS) (THIS)->vtable
 109 #define _IO_WIDE_JUMPS(THIS) ((struct _IO_FILE *) (THIS))->_wide_data->_wide_vtable
 110 #define _IO_CHECK_WIDE(THIS) (((struct _IO_FILE *) (THIS))->_wide_data != NULL)
 111
 112 #if _IO_JUMPS_OFFSET
 113 # define _IO_JUMPS_FUNC(THIS) \
 114  (*(struct _IO_jump_t **) ((void *) &_IO_JUMPS ((struct _IO_FILE_plus *) (THIS)) \
 115                            + (THIS)->_vtable_offset))
 116 # define _IO_vtable_offset(THIS) (THIS)->_vtable_offset
 117 #else
 118 # define _IO_JUMPS_FUNC(THIS) _IO_JUMPS ((struct _IO_FILE_plus *) (THIS))
 119 # define _IO_vtable_offset(THIS) 0
 120 #endif
 121 #define _IO_WIDE_JUMPS_FUNC(THIS) _IO_WIDE_JUMPS(THIS)
 122 #ifdef _G_USING_THUNKS
 123 # define JUMP_FIELD(TYPE, NAME) TYPE NAME
 124 # define JUMP0(FUNC, THIS) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS)
 125 # define JUMP1(FUNC, THIS, X1) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1)
 126 # define JUMP2(FUNC, THIS, X1, X2) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1, X2)
 127 # define JUMP3(FUNC, THIS, X1,X2,X3) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1,X2, X3)
 128 # define JUMP_INIT(NAME, VALUE) VALUE
 129 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0)
 130
 131 # define WJUMP0(FUNC, THIS) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS)
 132 # define WJUMP1(FUNC, THIS, X1) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1)
 133 # define WJUMP2(FUNC, THIS, X1, X2) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1, X2)
 134 # define WJUMP3(FUNC, THIS, X1,X2,X3) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1,X2, X3)
 135 #else
 136 /* These macros will change when we re-implement vtables to use "thunks"! */
 137 # define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
 138 # define JUMP0(FUNC, THIS) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS)
 139 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1)
 140 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1, X2)
 141 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1,X2,X3)
 142 # define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
 143 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
 144
 145 # define WJUMP0(FUNC, THIS) _IO_WIDE_JUMPS_FUNC(THIS)->FUNC.pfn (THIS)
 146 # define WJUMP1(FUNC, THIS, X1) _IO_WIDE_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1)
 147 # define WJUMP2(FUNC, THIS, X1, X2) _IO_WIDE_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1, X2)
 148 # define WJUMP3(FUNC, THIS, X1,X2,X3) _IO_WIDE_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1,X2,X3)
 149 #endif
 150
 151 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
 152    It does not delete (free) it, but does everything else to finalize it.
 153    It matches the streambuf::~streambuf virtual destructor.  */
 154 typedef void (*_IO_finish_t) (_IO_FILE *, int); /* finalize */
 155 #define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
 156 #define _IO_WFINISH(FP) WJUMP1 (__finish, FP, 0)
 157
 158 /* The 'overflow' hook flushes the buffer.
 159    The second argument is a character, or EOF.
 160    It matches the streambuf::overflow virtual function. */
 161 typedef int (*_IO_overflow_t) (_IO_FILE *, int);
 162 #define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
 163 #define _IO_WOVERFLOW(FP, CH) WJUMP1 (__overflow, FP, CH)
 164
 165 /* The 'underflow' hook tries to fills the get buffer.
 166    It returns the next character (as an unsigned char) or EOF.  The next
 167    character remains in the get buffer, and the get position is not changed.
 168    It matches the streambuf::underflow virtual function. */
 169 typedef int (*_IO_underflow_t) (_IO_FILE *);
 170 #define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
 171 #define _IO_WUNDERFLOW(FP) WJUMP0 (__underflow, FP)
 172
 173 /* The 'uflow' hook returns the next character in the input stream
 174    (cast to unsigned char), and increments the read position;
 175    EOF is returned on failure.
 176    It matches the streambuf::uflow virtual function, which is not in the
 177    cfront implementation, but was added to C++ by the ANSI/ISO committee. */
 178 #define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
 179 #define _IO_WUFLOW(FP) WJUMP0 (__uflow, FP)
 180
 181 /* The 'pbackfail' hook handles backing up.
 182    It matches the streambuf::pbackfail virtual function. */
 183 typedef int (*_IO_pbackfail_t) (_IO_FILE *, int);
 184 #define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
 185 #define _IO_WPBACKFAIL(FP, CH) WJUMP1 (__pbackfail, FP, CH)
 186
 187 /* The 'xsputn' hook writes upto N characters from buffer DATA.
 188    Returns the number of character actually written.
 189    It matches the streambuf::xsputn virtual function. */
 190 typedef _IO_size_t (*_IO_xsputn_t) (_IO_FILE *FP, const void *DATA,
 191                                     _IO_size_t N);
 192 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
 193 #define _IO_WXSPUTN(FP, DATA, N) WJUMP2 (__xsputn, FP, DATA, N)
 194
 195 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
 196    Returns the number of character actually read.
 197    It matches the streambuf::xsgetn virtual function. */
 198 typedef _IO_size_t (*_IO_xsgetn_t) (_IO_FILE *FP, void *DATA, _IO_size_t N);
 199 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
 200 #define _IO_WXSGETN(FP, DATA, N) WJUMP2 (__xsgetn, FP, DATA, N)
 201
 202 /* The 'seekoff' hook moves the stream position to a new position
 203    relative to the start of the file (if DIR==0), the current position
 204    (MODE==1), or the end of the file (MODE==2).
 205    It matches the streambuf::seekoff virtual function.
 206    It is also used for the ANSI fseek function. */
 207 typedef _IO_off64_t (*_IO_seekoff_t) (_IO_FILE *FP, _IO_off64_t OFF, int DIR,
 208                                       int MODE);
 209 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
 210 #define _IO_WSEEKOFF(FP, OFF, DIR, MODE) WJUMP3 (__seekoff, FP, OFF, DIR, MODE)
 211
 212 /* The 'seekpos' hook also moves the stream position,
 213    but to an absolute position given by a fpos64_t (seekpos).
 214    It matches the streambuf::seekpos virtual function.
 215    It is also used for the ANSI fgetpos and fsetpos functions.  */
 216 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
 217 typedef _IO_off64_t (*_IO_seekpos_t) (_IO_FILE *, _IO_off64_t, int);
 218 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS)
 219 #define _IO_WSEEKPOS(FP, POS, FLAGS) WJUMP2 (__seekpos, FP, POS, FLAGS)
 220
 221 /* The 'setbuf' hook gives a buffer to the file.
 222    It matches the streambuf::setbuf virtual function. */
 223 typedef _IO_FILE* (*_IO_setbuf_t) (_IO_FILE *, char *, _IO_ssize_t);
 224 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH)
 225 #define _IO_WSETBUF(FP, BUFFER, LENGTH) WJUMP2 (__setbuf, FP, BUFFER, LENGTH)
 226
 227 /* The 'sync' hook attempts to synchronize the internal data structures
 228    of the file with the external state.
 229    It matches the streambuf::sync virtual function. */
 230 typedef int (*_IO_sync_t) (_IO_FILE *);
 231 #define _IO_SYNC(FP) JUMP0 (__sync, FP)
 232 #define _IO_WSYNC(FP) WJUMP0 (__sync, FP)
 233
 234 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
 235    It matches the streambuf::doallocate virtual function, which is not
 236    in the ANSI/ISO C++ standard, but is part traditional implementations. */
 237 typedef int (*_IO_doallocate_t) (_IO_FILE *);
 238 #define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
 239 #define _IO_WDOALLOCATE(FP) WJUMP0 (__doallocate, FP)
 240
 241 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
 242    sysstat) are low-level hooks specific to this implementation.
 243    There is no correspondence in the ANSI/ISO C++ standard library.
 244    The hooks basically correspond to the Unix system functions
 245    (read, write, close, lseek, and stat) except that a _IO_FILE*
 246    parameter is used instead of a integer file descriptor;  the default
 247    implementation used for normal files just calls those functions.
 248    The advantage of overriding these functions instead of the higher-level
 249    ones (underflow, overflow etc) is that you can leave all the buffering
 250    higher-level functions.  */
 251
 252 /* The 'sysread' hook is used to read data from the external file into
 253    an existing buffer.  It generalizes the Unix read(2) function.
 254    It matches the streambuf::sys_read virtual function, which is
 255    specific to this implementation. */
 256 typedef _IO_ssize_t (*_IO_read_t) (_IO_FILE *, void *, _IO_ssize_t);
 257 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN)
 258 #define _IO_WSYSREAD(FP, DATA, LEN) WJUMP2 (__read, FP, DATA, LEN)
 259
 260 /* The 'syswrite' hook is used to write data from an existing buffer
 261    to an external file.  It generalizes the Unix write(2) function.
 262    It matches the streambuf::sys_write virtual function, which is
 263    specific to this implementation. */
 264 typedef _IO_ssize_t (*_IO_write_t) (_IO_FILE *, const void *, _IO_ssize_t);
 265 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
 266 #define _IO_WSYSWRITE(FP, DATA, LEN) WJUMP2 (__write, FP, DATA, LEN)
 267
 268 /* The 'sysseek' hook is used to re-position an external file.
 269    It generalizes the Unix lseek(2) function.
 270    It matches the streambuf::sys_seek virtual function, which is
 271    specific to this implementation. */
 272 typedef _IO_off64_t (*_IO_seek_t) (_IO_FILE *, _IO_off64_t, int);
 273 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
 274 #define _IO_WSYSSEEK(FP, OFFSET, MODE) WJUMP2 (__seek, FP, OFFSET, MODE)
 275
 276 /* The 'sysclose' hook is used to finalize (close, finish up) an
 277    external file.  It generalizes the Unix close(2) function.
 278    It matches the streambuf::sys_close virtual function, which is
 279    specific to this implementation. */
 280 typedef int (*_IO_close_t) (_IO_FILE *); /* finalize */
 281 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
 282 #define _IO_WSYSCLOSE(FP) WJUMP0 (__close, FP)
 283
 284 /* The 'sysstat' hook is used to get information about an external file
 285    into a struct stat buffer.  It generalizes the Unix fstat(2) call.
 286    It matches the streambuf::sys_stat virtual function, which is
 287    specific to this implementation. */
 288 typedef int (*_IO_stat_t) (_IO_FILE *, void *);
 289 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
 290 #define _IO_WSYSSTAT(FP, BUF) WJUMP1 (__stat, FP, BUF)
 291
 292 /* The 'showmany' hook can be used to get an image how much input is
 293    available.  In many cases the answer will be 0 which means unknown
 294    but some cases one can provide real information.  */
 295 typedef int (*_IO_showmanyc_t) (_IO_FILE *);
 296 #define _IO_SHOWMANYC(FP) JUMP0 (__showmanyc, FP)
 297 #define _IO_WSHOWMANYC(FP) WJUMP0 (__showmanyc, FP)
 298
 299 /* The 'imbue' hook is used to get information about the currently
 300    installed locales.  */
 301 typedef void (*_IO_imbue_t) (_IO_FILE *, void *);
 302 #define _IO_IMBUE(FP, LOCALE) JUMP1 (__imbue, FP, LOCALE)
 303 #define _IO_WIMBUE(FP, LOCALE) WJUMP1 (__imbue, FP, LOCALE)
 304
 305
 306 #define _IO_CHAR_TYPE char /* unsigned char ? */
 307 #define _IO_INT_TYPE int
 308
 309 struct _IO_jump_t
 310 {
 311     JUMP_FIELD(_G_size_t, __dummy);
 312 #ifdef _G_USING_THUNKS
 313     JUMP_FIELD(_G_size_t, __dummy2);
 314 #endif
 315     JUMP_FIELD(_IO_finish_t, __finish);
 316     JUMP_FIELD(_IO_overflow_t, __overflow);
 317     JUMP_FIELD(_IO_underflow_t, __underflow);
 318     JUMP_FIELD(_IO_underflow_t, __uflow);
 319     JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
 320     /* showmany */
 321     JUMP_FIELD(_IO_xsputn_t, __xsputn);
 322     JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
 323     JUMP_FIELD(_IO_seekoff_t, __seekoff);
 324     JUMP_FIELD(_IO_seekpos_t, __seekpos);
 325     JUMP_FIELD(_IO_setbuf_t, __setbuf);
 326     JUMP_FIELD(_IO_sync_t, __sync);
 327     JUMP_FIELD(_IO_doallocate_t, __doallocate);
 328     JUMP_FIELD(_IO_read_t, __read);
 329     JUMP_FIELD(_IO_write_t, __write);
 330     JUMP_FIELD(_IO_seek_t, __seek);
 331     JUMP_FIELD(_IO_close_t, __close);
 332     JUMP_FIELD(_IO_stat_t, __stat);
 333     JUMP_FIELD(_IO_showmanyc_t, __showmanyc);
 334     JUMP_FIELD(_IO_imbue_t, __imbue);
 335 #if 0
 336     get_column;
 337     set_column;
 338 #endif
 339 };
 340
 341 /* We always allocate an extra word following an _IO_FILE.
 342    This contains a pointer to the function jump table used.
 343    This is for compatibility with C++ streambuf; the word can
 344    be used to smash to a pointer to a virtual function table. */
 345
 346 struct _IO_FILE_plus
 347 {
 348   _IO_FILE file;
 349   const struct _IO_jump_t *vtable;
 350 };
 351
 352 #ifdef _IO_USE_OLD_IO_FILE
 353 /* This structure is used by the compatibility code as if it were an
 354    _IO_FILE_plus, but has enough space to initialize the _mode argument
 355    of an _IO_FILE_complete.  */
 356 struct _IO_FILE_complete_plus
 357 {
 358   struct _IO_FILE_complete file;
 359   const struct _IO_jump_t *vtable;
 360 };
 361 #endif
 362
 363 /* Special file type for fopencookie function.  */
 364 struct _IO_cookie_file
 365 {
 366   struct _IO_FILE_plus __fp;
 367   void *__cookie;
 368   _IO_cookie_io_functions_t __io_functions;
 369 };
 370
 371 _IO_FILE *_IO_fopencookie (void *cookie, const char *mode,
 372                            _IO_cookie_io_functions_t io_functions);
 373
 374
 375 /* Iterator type for walking global linked list of _IO_FILE objects. */
 376
 377 typedef struct _IO_FILE *_IO_ITER;
 378
 379 /* Generic functions */
 380
 381 extern void _IO_switch_to_main_get_area (_IO_FILE *) __THROW;
 382 extern void _IO_switch_to_backup_area (_IO_FILE *) __THROW;
 383 extern int _IO_switch_to_get_mode (_IO_FILE *);
 384 extern void _IO_init (_IO_FILE *, int) __THROW;
 385 extern int _IO_sputbackc (_IO_FILE *, int) __THROW;
 386 extern int _IO_sungetc (_IO_FILE *) __THROW;
 387 extern void _IO_un_link (struct _IO_FILE_plus *) __THROW;
 388 extern void _IO_link_in (struct _IO_FILE_plus *) __THROW;
 389 extern void _IO_doallocbuf (_IO_FILE *) __THROW;
 390 extern void _IO_unsave_markers (_IO_FILE *) __THROW;
 391 extern void _IO_setb (_IO_FILE *, char *, char *, int) __THROW;
 392 extern unsigned _IO_adjust_column (unsigned, const char *, int) __THROW;
 393 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
 394
 395 extern void _IO_switch_to_main_wget_area (_IO_FILE *) __THROW;
 396 extern void _IO_switch_to_wbackup_area (_IO_FILE *) __THROW;
 397 extern int _IO_switch_to_wget_mode (_IO_FILE *);
 398 extern void _IO_wsetb (_IO_FILE *, wchar_t *, wchar_t *, int) __THROW;
 399 extern wint_t _IO_sputbackwc (_IO_FILE *, wint_t) __THROW;
 400 extern wint_t _IO_sungetwc (_IO_FILE *) __THROW;
 401 extern void _IO_wdoallocbuf (_IO_FILE *) __THROW;
 402 extern void _IO_unsave_wmarkers (_IO_FILE *) __THROW;
 403 extern unsigned _IO_adjust_wcolumn (unsigned, const wchar_t *, int) __THROW;
 404
 405 /* Marker-related function. */
 406
 407 extern void _IO_init_marker (struct _IO_marker *, _IO_FILE *);
 408 extern void _IO_init_wmarker (struct _IO_marker *, _IO_FILE *);
 409 extern void _IO_remove_marker (struct _IO_marker *) __THROW;
 410 extern int _IO_marker_difference (struct _IO_marker *, struct _IO_marker *)
 411      __THROW;
 412 extern int _IO_marker_delta (struct _IO_marker *) __THROW;
 413 extern int _IO_wmarker_delta (struct _IO_marker *) __THROW;
 414 extern int _IO_seekmark (_IO_FILE *, struct _IO_marker *, int) __THROW;
 415 extern int _IO_seekwmark (_IO_FILE *, struct _IO_marker *, int) __THROW;
 416
 417 /* Functions for iterating global list and dealing with its lock */
 418
 419 extern _IO_ITER _IO_iter_begin (void) __THROW;
 420 libc_hidden_proto (_IO_iter_begin)
 421 extern _IO_ITER _IO_iter_end (void) __THROW;
 422 libc_hidden_proto (_IO_iter_end)
 423 extern _IO_ITER _IO_iter_next (_IO_ITER) __THROW;
 424 libc_hidden_proto (_IO_iter_next)
 425 extern _IO_FILE *_IO_iter_file (_IO_ITER) __THROW;
 426 libc_hidden_proto (_IO_iter_file)
 427 extern void _IO_list_lock (void) __THROW;
 428 libc_hidden_proto (_IO_list_lock)
 429 extern void _IO_list_unlock (void) __THROW;
 430 libc_hidden_proto (_IO_list_unlock)
 431 extern void _IO_list_resetlock (void) __THROW;
 432 libc_hidden_proto (_IO_list_resetlock)
 433
 434 /* Default jumptable functions. */
 435
 436 extern int _IO_default_underflow (_IO_FILE *) __THROW;
 437 extern int _IO_default_uflow (_IO_FILE *);
 438 extern wint_t _IO_wdefault_uflow (_IO_FILE *);
 439 extern int _IO_default_doallocate (_IO_FILE *) __THROW;
 440 extern int _IO_wdefault_doallocate (_IO_FILE *) __THROW;
 441 extern void _IO_default_finish (_IO_FILE *, int) __THROW;
 442 extern void _IO_wdefault_finish (_IO_FILE *, int) __THROW;
 443 extern int _IO_default_pbackfail (_IO_FILE *, int) __THROW;
 444 extern wint_t _IO_wdefault_pbackfail (_IO_FILE *, wint_t) __THROW;
 445 extern _IO_FILE* _IO_default_setbuf (_IO_FILE *, char *, _IO_ssize_t);
 446 extern _IO_size_t _IO_default_xsputn (_IO_FILE *, const void *, _IO_size_t);
 447 extern _IO_size_t _IO_wdefault_xsputn (_IO_FILE *, const void *, _IO_size_t);
 448 extern _IO_size_t _IO_default_xsgetn (_IO_FILE *, void *, _IO_size_t);
 449 extern _IO_size_t _IO_wdefault_xsgetn (_IO_FILE *, void *, _IO_size_t);
 450 extern _IO_off64_t _IO_default_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 451      __THROW;
 452 extern _IO_off64_t _IO_default_seekpos (_IO_FILE *, _IO_off64_t, int);
 453 extern _IO_ssize_t _IO_default_write (_IO_FILE *, const void *, _IO_ssize_t);
 454 extern _IO_ssize_t _IO_default_read (_IO_FILE *, void *, _IO_ssize_t);
 455 extern int _IO_default_stat (_IO_FILE *, void *) __THROW;
 456 extern _IO_off64_t _IO_default_seek (_IO_FILE *, _IO_off64_t, int) __THROW;
 457 extern int _IO_default_sync (_IO_FILE *) __THROW;
 458 #define _IO_default_close ((_IO_close_t) _IO_default_sync)
 459 extern int _IO_default_showmanyc (_IO_FILE *) __THROW;
 460 extern void _IO_default_imbue (_IO_FILE *, void *) __THROW;
 461
 462 extern const struct _IO_jump_t _IO_file_jumps;
 463 libc_hidden_proto (_IO_file_jumps)
 464 extern const struct _IO_jump_t _IO_file_jumps_mmap attribute_hidden;
 465 extern const struct _IO_jump_t _IO_file_jumps_maybe_mmap attribute_hidden;
 466 extern const struct _IO_jump_t _IO_wfile_jumps;
 467 libc_hidden_proto (_IO_wfile_jumps)
 468 extern const struct _IO_jump_t _IO_wfile_jumps_mmap attribute_hidden;
 469 extern const struct _IO_jump_t _IO_wfile_jumps_maybe_mmap attribute_hidden;
 470 extern const struct _IO_jump_t _IO_old_file_jumps attribute_hidden;
 471 extern const struct _IO_jump_t _IO_streambuf_jumps;
 472 extern const struct _IO_jump_t _IO_old_proc_jumps attribute_hidden;
 473 extern const struct _IO_jump_t _IO_str_jumps attribute_hidden;
 474 extern const struct _IO_jump_t _IO_wstr_jumps attribute_hidden;
 475 extern const struct _IO_codecvt __libio_codecvt attribute_hidden;
 476 extern int _IO_do_write (_IO_FILE *, const char *, _IO_size_t);
 477 extern int _IO_new_do_write (_IO_FILE *, const char *, _IO_size_t);
 478 extern int _IO_old_do_write (_IO_FILE *, const char *, _IO_size_t);
 479 extern int _IO_wdo_write (_IO_FILE *, const wchar_t *, _IO_size_t);
 480 extern int _IO_flush_all_lockp (int);
 481 extern int _IO_flush_all (void);
 482 extern int _IO_cleanup (void);
 483 extern void _IO_flush_all_linebuffered (void);
 484 extern int _IO_new_fgetpos (_IO_FILE *, _IO_fpos_t *);
 485 extern int _IO_old_fgetpos (_IO_FILE *, _IO_fpos_t *);
 486 extern int _IO_new_fsetpos (_IO_FILE *, const _IO_fpos_t *);
 487 extern int _IO_old_fsetpos (_IO_FILE *, const _IO_fpos_t *);
 488 extern int _IO_new_fgetpos64 (_IO_FILE *, _IO_fpos64_t *);
 489 extern int _IO_old_fgetpos64 (_IO_FILE *, _IO_fpos64_t *);
 490 extern int _IO_new_fsetpos64 (_IO_FILE *, const _IO_fpos64_t *);
 491 extern int _IO_old_fsetpos64 (_IO_FILE *, const _IO_fpos64_t *);
 492 extern void _IO_old_init (_IO_FILE *fp, int flags) __THROW;
 493
 494
 495 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 496 # define _IO_do_flush(_f) \
 497   ((_f)->_mode <= 0                                                           \
 498    ? INTUSE(_IO_do_write)(_f, (_f)->_IO_write_base,                           \
 499                           (_f)->_IO_write_ptr-(_f)->_IO_write_base)           \
 500    : INTUSE(_IO_wdo_write)(_f, (_f)->_wide_data->_IO_write_base,              \
 501                            ((_f)->_wide_data->_IO_write_ptr                   \
 502                             - (_f)->_wide_data->_IO_write_base)))
 503 #else
 504 # define _IO_do_flush(_f) \
 505    INTUSE(_IO_do_write)(_f, (_f)->_IO_write_base,                             \
 506                         (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 507 #endif
 508 #define _IO_old_do_flush(_f) \
 509   _IO_old_do_write(_f, (_f)->_IO_write_base, \
 510                    (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 511 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
 512 #define _IO_mask_flags(fp, f, mask) \
 513        ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
 514 #define _IO_setg(fp, eb, g, eg)  ((fp)->_IO_read_base = (eb),\
 515         (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
 516 #define _IO_wsetg(fp, eb, g, eg)  ((fp)->_wide_data->_IO_read_base = (eb),\
 517         (fp)->_wide_data->_IO_read_ptr = (g), \
 518         (fp)->_wide_data->_IO_read_end = (eg))
 519 #define _IO_setp(__fp, __p, __ep) \
 520        ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr \
 521         = __p, (__fp)->_IO_write_end = (__ep))
 522 #define _IO_wsetp(__fp, __p, __ep) \
 523        ((__fp)->_wide_data->_IO_write_base \
 524         = (__fp)->_wide_data->_IO_write_ptr = __p, \
 525         (__fp)->_wide_data->_IO_write_end = (__ep))
 526 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
 527 #define _IO_have_wbackup(fp) ((fp)->_wide_data->_IO_save_base != NULL)
 528 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
 529 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
 530 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
 531 #define _IO_wblen(fp) ((fp)->_wide_data->_IO_buf_end \
 532                        - (fp)->_wide_data->_IO_buf_base)
 533
 534 /* Jumptable functions for files. */
 535
 536 extern int _IO_file_doallocate (_IO_FILE *) __THROW;
 537 extern _IO_FILE* _IO_file_setbuf (_IO_FILE *, char *, _IO_ssize_t);
 538 extern _IO_off64_t _IO_file_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 539 extern _IO_off64_t _IO_file_seekoff_mmap (_IO_FILE *, _IO_off64_t, int, int)
 540      __THROW;
 541 extern _IO_size_t _IO_file_xsputn (_IO_FILE *, const void *, _IO_size_t);
 542 extern _IO_size_t _IO_file_xsgetn (_IO_FILE *, void *, _IO_size_t);
 543 extern int _IO_file_stat (_IO_FILE *, void *) __THROW;
 544 extern int _IO_file_close (_IO_FILE *) __THROW;
 545 extern int _IO_file_close_mmap (_IO_FILE *) __THROW;
 546 extern int _IO_file_underflow (_IO_FILE *);
 547 extern int _IO_file_underflow_mmap (_IO_FILE *);
 548 extern int _IO_file_underflow_maybe_mmap (_IO_FILE *);
 549 extern int _IO_file_overflow (_IO_FILE *, int);
 550 #define _IO_file_is_open(__fp) ((__fp)->_fileno != -1)
 551 extern void _IO_file_init (struct _IO_FILE_plus *) __THROW;
 552 extern _IO_FILE* _IO_file_attach (_IO_FILE *, int);
 553 extern _IO_FILE* _IO_file_open (_IO_FILE *, const char *, int, int, int, int);
 554 libc_hidden_proto (_IO_file_open)
 555 extern _IO_FILE* _IO_file_fopen (_IO_FILE *, const char *, const char *, int);
 556 extern _IO_ssize_t _IO_file_write (_IO_FILE *, const void *, _IO_ssize_t);
 557 extern _IO_ssize_t _IO_file_read (_IO_FILE *, void *, _IO_ssize_t);
 558 extern int _IO_file_sync (_IO_FILE *);
 559 extern int _IO_file_close_it (_IO_FILE *);
 560 extern _IO_off64_t _IO_file_seek (_IO_FILE *, _IO_off64_t, int) __THROW;
 561 extern void _IO_file_finish (_IO_FILE *, int);
 562
 563 extern _IO_FILE* _IO_new_file_attach (_IO_FILE *, int);
 564 extern int _IO_new_file_close_it (_IO_FILE *);
 565 extern void _IO_new_file_finish (_IO_FILE *, int);
 566 extern _IO_FILE* _IO_new_file_fopen (_IO_FILE *, const char *, const char *,
 567                                      int);
 568 extern void _IO_no_init (_IO_FILE *, int, int, struct _IO_wide_data *,
 569                          const struct _IO_jump_t *) __THROW;
 570 extern void _IO_new_file_init (struct _IO_FILE_plus *) __THROW;
 571 extern _IO_FILE* _IO_new_file_setbuf (_IO_FILE *, char *, _IO_ssize_t);
 572 extern _IO_FILE* _IO_file_setbuf_mmap (_IO_FILE *, char *, _IO_ssize_t);
 573 extern int _IO_new_file_sync (_IO_FILE *);
 574 extern int _IO_new_file_underflow (_IO_FILE *);
 575 extern int _IO_new_file_overflow (_IO_FILE *, int);
 576 extern _IO_off64_t _IO_new_file_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 577 extern _IO_ssize_t _IO_new_file_write (_IO_FILE *, const void *, _IO_ssize_t);
 578 extern _IO_size_t _IO_new_file_xsputn (_IO_FILE *, const void *, _IO_size_t);
 579
 580 extern _IO_FILE* _IO_old_file_setbuf (_IO_FILE *, char *, _IO_ssize_t);
 581 extern _IO_off64_t _IO_old_file_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 582 extern _IO_size_t _IO_old_file_xsputn (_IO_FILE *, const void *, _IO_size_t);
 583 extern int _IO_old_file_underflow (_IO_FILE *);
 584 extern int _IO_old_file_overflow (_IO_FILE *, int);
 585 extern void _IO_old_file_init (struct _IO_FILE_plus *) __THROW;
 586 extern _IO_FILE* _IO_old_file_attach (_IO_FILE *, int);
 587 extern _IO_FILE* _IO_old_file_fopen (_IO_FILE *, const char *, const char *);
 588 extern _IO_ssize_t _IO_old_file_write (_IO_FILE *, const void *, _IO_ssize_t);
 589 extern int _IO_old_file_sync (_IO_FILE *);
 590 extern int _IO_old_file_close_it (_IO_FILE *);
 591 extern void _IO_old_file_finish (_IO_FILE *, int);
 592
 593 extern int _IO_wfile_doallocate (_IO_FILE *) __THROW;
 594 extern _IO_size_t _IO_wfile_xsputn (_IO_FILE *, const void *, _IO_size_t);
 595 extern _IO_FILE* _IO_wfile_setbuf (_IO_FILE *, wchar_t *, _IO_ssize_t);
 596 extern wint_t _IO_wfile_sync (_IO_FILE *);
 597 extern wint_t _IO_wfile_underflow (_IO_FILE *);
 598 extern wint_t _IO_wfile_overflow (_IO_FILE *, wint_t);
 599 extern _IO_off64_t _IO_wfile_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 600
 601 /* Jumptable functions for proc_files. */
 602 extern _IO_FILE* _IO_proc_open (_IO_FILE *, const char *, const char *)
 603      __THROW;
 604 extern _IO_FILE* _IO_new_proc_open (_IO_FILE *, const char *, const char *)
 605      __THROW;
 606 extern _IO_FILE* _IO_old_proc_open (_IO_FILE *, const char *, const char *);
 607 extern int _IO_proc_close (_IO_FILE *) __THROW;
 608 extern int _IO_new_proc_close (_IO_FILE *) __THROW;
 609 extern int _IO_old_proc_close (_IO_FILE *);
 610
 611 /* Jumptable functions for strfiles. */
 612 extern int _IO_str_underflow (_IO_FILE *) __THROW;
 613 extern int _IO_str_overflow (_IO_FILE *, int) __THROW;
 614 extern int _IO_str_pbackfail (_IO_FILE *, int) __THROW;
 615 extern _IO_off64_t _IO_str_seekoff (_IO_FILE *, _IO_off64_t, int, int) __THROW;
 616 extern void _IO_str_finish (_IO_FILE *, int) __THROW;
 617
 618 /* Other strfile functions */
 619 struct _IO_strfile_;
 620 extern void _IO_str_init_static (struct _IO_strfile_ *, char *, int, char *)
 621      __THROW;
 622 extern void _IO_str_init_readonly (struct _IO_strfile_ *, const char *, int)
 623      __THROW;
 624 extern _IO_ssize_t _IO_str_count (_IO_FILE *) __THROW;
 625
 626 /* And the wide character versions.  */
 627 extern void _IO_wstr_init_static (_IO_FILE *, wchar_t *, _IO_size_t, wchar_t *)
 628      __THROW;
 629 extern _IO_ssize_t _IO_wstr_count (_IO_FILE *) __THROW;
 630 extern _IO_wint_t _IO_wstr_overflow (_IO_FILE *, _IO_wint_t) __THROW;
 631 extern _IO_wint_t _IO_wstr_underflow (_IO_FILE *) __THROW;
 632 extern _IO_off64_t _IO_wstr_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 633      __THROW;
 634 extern _IO_wint_t _IO_wstr_pbackfail (_IO_FILE *, _IO_wint_t) __THROW;
 635 extern void _IO_wstr_finish (_IO_FILE *, int) __THROW;
 636
 637 extern int _IO_vasprintf (char **result_ptr, const char *format,
 638                           _IO_va_list args) __THROW;
 639 extern int _IO_vdprintf (int d, const char *format, _IO_va_list arg);
 640 extern int _IO_vsnprintf (char *string, _IO_size_t maxlen,
 641                           const char *format, _IO_va_list args) __THROW;
 642
 643
 644 extern _IO_size_t _IO_getline (_IO_FILE *,char *, _IO_size_t, int, int);
 645 extern _IO_size_t _IO_getline_info (_IO_FILE *,char *, _IO_size_t,
 646                                     int, int, int *);
 647 extern _IO_ssize_t _IO_getdelim (char **, _IO_size_t *, int, _IO_FILE *);
 648 extern _IO_size_t _IO_getwline (_IO_FILE *,wchar_t *, _IO_size_t, wint_t, int);
 649 extern _IO_size_t _IO_getwline_info (_IO_FILE *,wchar_t *, _IO_size_t,
 650                                      wint_t, int, wint_t *);
 651
 652 extern struct _IO_FILE_plus *_IO_list_all;
 653 extern void (*_IO_cleanup_registration_needed) (void);
 654
 655 /* Prototype for functions with alternative entry point.  */
 656 extern int _IO_flush_all_internal (void);
 657 extern unsigned _IO_adjust_column_internal (unsigned, const char *, int);
 658
 659 extern int _IO_default_uflow_internal (_IO_FILE *);
 660 extern void _IO_default_finish_internal (_IO_FILE *, int) __THROW;
 661 extern int _IO_default_pbackfail_internal (_IO_FILE *, int) __THROW;
 662 extern _IO_size_t _IO_default_xsputn_internal (_IO_FILE *, const void *,
 663                                                _IO_size_t);
 664 extern _IO_size_t _IO_default_xsgetn_internal (_IO_FILE *, void *, _IO_size_t);
 665 extern int _IO_default_doallocate_internal (_IO_FILE *) __THROW;
 666 extern void _IO_wdefault_finish_internal (_IO_FILE *, int) __THROW;
 667 extern wint_t _IO_wdefault_pbackfail_internal (_IO_FILE *, wint_t) __THROW;
 668 extern _IO_size_t _IO_wdefault_xsputn_internal (_IO_FILE *, const void *,
 669                                                 _IO_size_t);
 670 extern _IO_size_t _IO_wdefault_xsgetn_internal (_IO_FILE *, void *,
 671                                                 _IO_size_t);
 672 extern int _IO_wdefault_doallocate_internal (_IO_FILE *) __THROW;
 673 extern wint_t _IO_wdefault_uflow_internal (_IO_FILE *);
 674
 675 extern int _IO_file_doallocate_internal (_IO_FILE *) __THROW;
 676 extern _IO_FILE* _IO_file_setbuf_internal (_IO_FILE *, char *, _IO_ssize_t);
 677 extern _IO_off64_t _IO_file_seekoff_internal (_IO_FILE *, _IO_off64_t,
 678                                               int, int);
 679 extern _IO_size_t _IO_file_xsputn_internal (_IO_FILE *, const void *,
 680                                             _IO_size_t);
 681 extern _IO_size_t _IO_file_xsgetn_internal (_IO_FILE *, void *, _IO_size_t);
 682 extern int _IO_file_stat_internal (_IO_FILE *, void *) __THROW;
 683 extern int _IO_file_close_internal (_IO_FILE *) __THROW;
 684 extern int _IO_file_close_it_internal (_IO_FILE *);
 685 extern int _IO_file_underflow_internal (_IO_FILE *);
 686 extern int _IO_file_overflow_internal (_IO_FILE *, int);
 687 extern void _IO_file_init_internal (struct _IO_FILE_plus *) __THROW;
 688 extern _IO_FILE* _IO_file_attach_internal (_IO_FILE *, int);
 689 extern _IO_FILE* _IO_file_fopen_internal (_IO_FILE *, const char *,
 690                                           const char *, int);
 691 extern _IO_ssize_t _IO_file_read_internal (_IO_FILE *, void *,
 692                                            _IO_ssize_t);
 693 extern int _IO_file_sync_internal (_IO_FILE *);
 694 extern _IO_off64_t _IO_file_seek_internal (_IO_FILE *, _IO_off64_t, int)
 695      __THROW;
 696 extern void _IO_file_finish_internal (_IO_FILE *, int);
 697
 698 extern _IO_size_t _IO_wfile_xsputn_internal (_IO_FILE *, const void *,
 699                                              _IO_size_t);
 700 extern _IO_off64_t _IO_wfile_seekoff_internal (_IO_FILE *, _IO_off64_t,
 701                                                int, int);
 702 extern wint_t _IO_wfile_sync_internal (_IO_FILE *);
 703
 704 extern int _IO_str_underflow_internal (_IO_FILE *) __THROW;
 705 extern int _IO_str_overflow_internal (_IO_FILE *, int) __THROW;
 706 extern int _IO_str_pbackfail_internal (_IO_FILE *, int) __THROW;
 707 extern _IO_off64_t _IO_str_seekoff_internal (_IO_FILE *, _IO_off64_t,
 708                                              int, int) __THROW;
 709 extern void _IO_str_init_static_internal (struct _IO_strfile_ *, char *,
 710                                           _IO_size_t, char *) __THROW;
 711
 712 extern struct _IO_jump_t _IO_file_jumps_internal attribute_hidden;
 713 extern struct _IO_jump_t _IO_wfile_jumps_internal attribute_hidden;
 714
 715 extern struct _IO_FILE_plus *_IO_list_all_internal attribute_hidden;
 716
 717 extern void _IO_link_in_internal (struct _IO_FILE_plus *) __THROW;
 718 extern int _IO_sputbackc_internal (_IO_FILE *, int) __THROW;
 719 extern void _IO_wdoallocbuf_internal (_IO_FILE *) __THROW;
 720
 721 extern _IO_size_t _IO_sgetn_internal (_IO_FILE *, void *, _IO_size_t);
 722 extern void _IO_flush_all_linebuffered_internal (void) __THROW;
 723 extern int _IO_switch_to_wget_mode_internal (_IO_FILE *);
 724 extern void _IO_unsave_markers_internal (_IO_FILE *) __THROW;
 725 extern void _IO_switch_to_main_wget_area_internal (_IO_FILE *) __THROW;
 726 extern int _IO_wdo_write_internal (_IO_FILE *, const wchar_t *, _IO_size_t);
 727 extern int _IO_do_write_internal (_IO_FILE *, const char *, _IO_size_t);
 728 extern _IO_ssize_t _IO_padn_internal (_IO_FILE *, int, _IO_ssize_t);
 729 extern _IO_size_t _IO_getline_info_internal (_IO_FILE *,char *, _IO_size_t,
 730                                              int, int, int *);
 731 extern _IO_size_t _IO_getline_internal (_IO_FILE *, char *, _IO_size_t, int,
 732                                         int);
 733 extern void _IO_free_wbackup_area_internal (_IO_FILE *) __THROW;
 734 extern void _IO_free_backup_area_internal (_IO_FILE *) __THROW;
 735 extern void _IO_switch_to_wbackup_area_internal (_IO_FILE *) __THROW;
 736 extern void _IO_setb_internal (_IO_FILE *, char *, char *, int) __THROW;
 737 extern wint_t _IO_sputbackwc_internal (_IO_FILE *, wint_t) __THROW;
 738 extern int _IO_switch_to_get_mode_internal (_IO_FILE *);
 739 extern int _IO_vfscanf_internal (_IO_FILE * __restrict,
 740                                  const char * __restrict,
 741                                  _IO_va_list, int *__restrict);
 742 extern int _IO_vfprintf_internal (_IO_FILE *__restrict, const char *__restrict,
 743                                   _IO_va_list);
 744 extern void _IO_doallocbuf_internal (_IO_FILE *) __THROW;
 745 extern void _IO_wsetb_internal (_IO_FILE *, wchar_t *, wchar_t *, int)
 746      __THROW;
 747 extern _IO_off64_t _IO_seekoff_unlocked (_IO_FILE *, _IO_off64_t, int, int)
 748      attribute_hidden;
 749 extern _IO_off64_t _IO_seekpos_unlocked (_IO_FILE *, _IO_off64_t, int)
 750      attribute_hidden;
 751 extern int _IO_putc_internal (int __c, _IO_FILE *__fp);
 752 extern void _IO_init_internal (_IO_FILE *, int) __THROW;
 753 extern void _IO_un_link_internal (struct _IO_FILE_plus *) __THROW;
 754
 755 #ifndef EOF
 756 # define EOF (-1)
 757 #endif
 758 #ifndef NULL
 759 # if defined __GNUG__ && \
 760     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
 761 #  define NULL (__null)
 762 # else
 763 #  if !defined(__cplusplus)
 764 #   define NULL ((void*)0)
 765 #  else
 766 #   define NULL (0)
 767 #  endif
 768 # endif
 769 #endif
 770
 771 #if _G_HAVE_MMAP
 772
 773 # include <unistd.h>
 774 # include <fcntl.h>
 775 # include <sys/mman.h>
 776 # include <sys/param.h>
 777
 778 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 779 #  define MAP_ANONYMOUS MAP_ANON
 780 # endif
 781
 782 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
 783 #  undef _G_HAVE_MMAP
 784 #  define _G_HAVE_MMAP 0
 785 # endif
 786
 787 #endif /* _G_HAVE_MMAP */
 788
 789 #if _G_HAVE_MMAP
 790
 791 # ifdef _LIBC
 792 /* When using this code in the GNU libc we must not pollute the name space.  */
 793 #  define mmap __mmap
 794 #  define munmap __munmap
 795 #  define ftruncate __ftruncate
 796 # endif
 797
 798 # define ROUND_TO_PAGE(_S) \
 799        (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
 800
 801 # define FREE_BUF(_B, _S) \
 802        munmap ((_B), ROUND_TO_PAGE (_S))
 803 # define ALLOC_BUF(_B, _S, _R) \
 804        do {                                                                   \
 805           (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S),                        \
 806                                 PROT_READ | PROT_WRITE,                       \
 807                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);          \
 808           if ((_B) == (char *) MAP_FAILED)                                    \
 809             return (_R);                                                      \
 810        } while (0)
 811 # define ALLOC_WBUF(_B, _S, _R) \
 812        do {                                                                   \
 813           (_B) = (wchar_t *) mmap (0, ROUND_TO_PAGE (_S),                     \
 814                                    PROT_READ | PROT_WRITE,                    \
 815                                    MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);       \
 816           if ((_B) == (wchar_t *) MAP_FAILED)                                 \
 817             return (_R);                                                      \
 818        } while (0)
 819
 820 #else /* _G_HAVE_MMAP */
 821
 822 # define FREE_BUF(_B, _S) \
 823        free(_B)
 824 # define ALLOC_BUF(_B, _S, _R) \
 825        do {                                                                   \
 826           (_B) = (char*)malloc(_S);                                           \
 827           if ((_B) == NULL)                                                   \
 828             return (_R);                                                      \
 829        } while (0)
 830 # define ALLOC_WBUF(_B, _S, _R) \
 831        do {                                                                   \
 832           (_B) = (wchar_t *)malloc(_S);                                       \
 833           if ((_B) == NULL)                                                   \
 834             return (_R);                                                      \
 835        } while (0)
 836
 837 #endif /* _G_HAVE_MMAP */
 838
 839 #ifndef OS_FSTAT
 840 # define OS_FSTAT fstat
 841 #endif
 842 extern int _IO_vscanf (const char *, _IO_va_list) __THROW;
 843
 844 /* _IO_pos_BAD is an _IO_off64_t value indicating error, unknown, or EOF. */
 845 #ifndef _IO_pos_BAD
 846 # define _IO_pos_BAD ((_IO_off64_t) -1)
 847 #endif
 848 /* _IO_pos_adjust adjust an _IO_off64_t by some number of bytes. */
 849 #ifndef _IO_pos_adjust
 850 # define _IO_pos_adjust(pos, delta) ((pos) += (delta))
 851 #endif
 852 /* _IO_pos_0 is an _IO_off64_t value indicating beginning of file. */
 853 #ifndef _IO_pos_0
 854 # define _IO_pos_0 ((_IO_off64_t) 0)
 855 #endif
 856
 857 #ifdef __cplusplus
 858 }
 859 #endif
 860
 861 #ifdef _IO_MTSAFE_IO
 862 /* check following! */
 863 # ifdef _IO_USE_OLD_IO_FILE
 864 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 865        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 866          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 867          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
 868 # else
 869 #  if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 870 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 871        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 872          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 873          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock, _IO_pos_BAD,\
 874          NULL, WDP, 0 }
 875 #  else
 876 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 877        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 878          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 879          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock, _IO_pos_BAD,\
 880          0 }
 881 #  endif
 882 # endif
 883 #else
 884 # ifdef _IO_USE_OLD_IO_FILE
 885 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 886        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 887          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 888          0, _IO_pos_BAD }
 889 # else
 890 #  if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 891 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 892        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 893          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 894          0, _IO_pos_BAD, 0, 0, { 0 }, 0, _IO_pos_BAD, \
 895          NULL, WDP, 0 }
 896 #  else
 897 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 898        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 899          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 900          0, _IO_pos_BAD, 0, 0, { 0 }, 0, _IO_pos_BAD, \
 901          0 }
 902 #  endif
 903 # endif
 904 #endif
 905
 906 /* VTABLE_LABEL defines NAME as of the CLASS class.
 907    CNLENGTH is strlen(#CLASS).  */
 908 #ifdef __GNUC__
 909 # if _G_VTABLE_LABEL_HAS_LENGTH
 910 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 911   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
 912 # else
 913 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 914   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
 915 # endif
 916 #endif /* __GNUC__ */
 917
 918 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
 919 # ifdef __GNUC__
 920 VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
 921 # else
 922 #  if _G_VTABLE_LABEL_HAS_LENGTH
 923 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
 924 #  else
 925 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
 926 #  endif
 927 # endif
 928 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
 929
 930 #define _IO_va_start(args, last) va_start(args, last)
 931
 932 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
 933
 934 #if 1
 935 # define COERCE_FILE(FILE) /* Nothing */
 936 #else
 937 /* This is part of the kludge for binary compatibility with old stdio. */
 938 # define COERCE_FILE(FILE) \
 939   (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
 940     && (FILE) = *(FILE**)&((int*)fp)[1])
 941 #endif
 942
 943 #ifdef EINVAL
 944 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
 945 #else
 946 # define MAYBE_SET_EINVAL /* nothing */
 947 #endif
 948
 949 #ifdef IO_DEBUG
 950 # define CHECK_FILE(FILE, RET) \
 951         if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
 952         else { COERCE_FILE(FILE); \
 953                if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
 954           { MAYBE_SET_EINVAL; return RET; }}
 955 #else
 956 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)
 957 #endif
 958
 959 static inline void
 960 __attribute__ ((__always_inline__))
 961 _IO_acquire_lock_fct (_IO_FILE **p)
 962 {
 963   _IO_FILE *fp = *p;
 964   if ((fp->_flags & _IO_USER_LOCK) == 0)
 965     _IO_funlockfile (fp);
 966 }
 967
 968 static inline void
 969 __attribute__ ((__always_inline__))
 970 _IO_acquire_lock_clear_flags2_fct (_IO_FILE **p)
 971 {
 972   _IO_FILE *fp = *p;
 973   fp->_flags2 &= ~(_IO_FLAGS2_FORTIFY | _IO_FLAGS2_SCANF_STD);
 974   if ((fp->_flags & _IO_USER_LOCK) == 0)
 975     _IO_funlockfile (fp);
 976 }