libio/libioP.h

   1 /* Copyright (C) 1993-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.
  17
  18    As a special exception, if you link the code in this file with
  19    files compiled with a GNU compiler to produce an executable,
  20    that does not cause the resulting executable to be covered by
  21    the GNU Lesser General Public License.  This exception does not
  22    however invalidate any other reasons why the executable file
  23    might be covered by the GNU Lesser General Public License.
  24    This exception applies to code released by its copyright holders
  25    in files containing the exception.  */
  26
  27 /* NOTE: libio is now exclusively used only by glibc since libstdc++ has its
  28    own implementation.  As a result, functions that were implemented for C++
  29    (like *sputn) may no longer have C++ semantics.  This is of course only
  30    relevant for internal callers of these functions since these functions are
  31    not intended for external use otherwise.
  32
  33    FIXME: All of the C++ cruft eventually needs to go away.  */
  34
  35 #include <stddef.h>
  36
  37 #include <errno.h>
  38 #ifndef __set_errno
  39 # define __set_errno(Val) errno = (Val)
  40 #endif
  41 #if defined __GLIBC__ && __GLIBC__ >= 2
  42 # include <bits/libc-lock.h>
  43 #else
  44 /*# include <comthread.h>*/
  45 #endif
  46
  47 #include <math_ldbl_opt.h>
  48
  49 #include "iolibio.h"
  50
  51 /* Control of exported symbols.  Used in glibc.  By default we don't
  52    do anything.  */
  53 #ifndef libc_hidden_proto
  54 # define libc_hidden_proto(name)
  55 #endif
  56 #ifndef libc_hidden_def
  57 # define libc_hidden_def(name)
  58 #endif
  59 #ifndef libc_hidden_weak
  60 # define libc_hidden_weak(name)
  61 #endif
  62
  63 #ifdef __cplusplus
  64 extern "C" {
  65 #endif
  66
  67 #define _IO_seek_set 0
  68 #define _IO_seek_cur 1
  69 #define _IO_seek_end 2
  70
  71 /* THE JUMPTABLE FUNCTIONS.
  72
  73  * The _IO_FILE type is used to implement the FILE type in GNU libc,
  74  * as well as the streambuf class in GNU iostreams for C++.
  75  * These are all the same, just used differently.
  76  * An _IO_FILE (or FILE) object is allows followed by a pointer to
  77  * a jump table (of pointers to functions).  The pointer is accessed
  78  * with the _IO_JUMPS macro.  The jump table has an eccentric format,
  79  * so as to be compatible with the layout of a C++ virtual function table.
  80  * (as implemented by g++).  When a pointer to a streambuf object is
  81  * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
  82  * happens to point to the virtual function table of the streambuf.
  83  * Thus the _IO_JUMPS function table used for C stdio/libio does
  84  * double duty as the virtual function table for C++ streambuf.
  85  *
  86  * The entries in the _IO_JUMPS function table (and hence also the
  87  * virtual functions of a streambuf) are described below.
  88  * The first parameter of each function entry is the _IO_FILE/streambuf
  89  * object being acted on (i.e. the 'this' parameter).
  90  */
  91
  92 #ifdef _LIBC
  93 # include <shlib-compat.h>
  94 # if !SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
  95    /* Setting this macro disables the use of the _vtable_offset
  96       bias in _IO_JUMPS_FUNCS, below.  That is only needed if we
  97       want to support old binaries (see oldfileops.c).  */
  98 #  define _G_IO_NO_BACKWARD_COMPAT 1
  99 # endif
 100 #endif
 101
 102 #if (!defined _IO_USE_OLD_IO_FILE \
 103      && (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0))
 104 # define _IO_JUMPS_OFFSET 1
 105 #else
 106 # define _IO_JUMPS_OFFSET 0
 107 #endif
 108
 109 /* Type of MEMBER in struct type TYPE.  */
 110 #define _IO_MEMBER_TYPE(TYPE, MEMBER) __typeof__ (((TYPE){}).MEMBER)
 111
 112 /* Essentially ((TYPE *) THIS)->MEMBER, but avoiding the aliasing
 113    violation in case THIS has a different pointer type.  */
 114 #define _IO_CAST_FIELD_ACCESS(THIS, TYPE, MEMBER) \
 115   (*(_IO_MEMBER_TYPE (TYPE, MEMBER) *)(((char *) (THIS)) \
 116                                        + offsetof(TYPE, MEMBER)))
 117
 118 #define _IO_JUMPS(THIS) (THIS)->vtable
 119 #define _IO_JUMPS_FILE_plus(THIS) \
 120   _IO_CAST_FIELD_ACCESS ((THIS), struct _IO_FILE_plus, vtable)
 121 #define _IO_WIDE_JUMPS(THIS) \
 122   _IO_CAST_FIELD_ACCESS ((THIS), struct _IO_FILE, _wide_data)->_wide_vtable
 123 #define _IO_CHECK_WIDE(THIS) \
 124   (_IO_CAST_FIELD_ACCESS ((THIS), struct _IO_FILE, _wide_data) != NULL)
 125
 126 #if _IO_JUMPS_OFFSET
 127 # define _IO_JUMPS_FUNC(THIS) \
 128  (*(struct _IO_jump_t **) ((void *) &_IO_JUMPS_FILE_plus (THIS) \
 129                            + (THIS)->_vtable_offset))
 130 # define _IO_vtable_offset(THIS) (THIS)->_vtable_offset
 131 #else
 132 # define _IO_JUMPS_FUNC(THIS) _IO_JUMPS_FILE_plus (THIS)
 133 # define _IO_vtable_offset(THIS) 0
 134 #endif
 135 #define _IO_WIDE_JUMPS_FUNC(THIS) _IO_WIDE_JUMPS(THIS)
 136 #define JUMP_FIELD(TYPE, NAME) TYPE NAME
 137 #define JUMP0(FUNC, THIS) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS)
 138 #define JUMP1(FUNC, THIS, X1) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1)
 139 #define JUMP2(FUNC, THIS, X1, X2) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1, X2)
 140 #define JUMP3(FUNC, THIS, X1,X2,X3) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1,X2, X3)
 141 #define JUMP_INIT(NAME, VALUE) VALUE
 142 #define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0)
 143
 144 #define WJUMP0(FUNC, THIS) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS)
 145 #define WJUMP1(FUNC, THIS, X1) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1)
 146 #define WJUMP2(FUNC, THIS, X1, X2) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1, X2)
 147 #define WJUMP3(FUNC, THIS, X1,X2,X3) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1,X2, X3)
 148
 149 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
 150    It does not delete (free) it, but does everything else to finalize it.
 151    It matches the streambuf::~streambuf virtual destructor.  */
 152 typedef void (*_IO_finish_t) (_IO_FILE *, int); /* finalize */
 153 #define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
 154 #define _IO_WFINISH(FP) WJUMP1 (__finish, FP, 0)
 155
 156 /* The 'overflow' hook flushes the buffer.
 157    The second argument is a character, or EOF.
 158    It matches the streambuf::overflow virtual function. */
 159 typedef int (*_IO_overflow_t) (_IO_FILE *, int);
 160 #define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
 161 #define _IO_WOVERFLOW(FP, CH) WJUMP1 (__overflow, FP, CH)
 162
 163 /* The 'underflow' hook tries to fills the get buffer.
 164    It returns the next character (as an unsigned char) or EOF.  The next
 165    character remains in the get buffer, and the get position is not changed.
 166    It matches the streambuf::underflow virtual function. */
 167 typedef int (*_IO_underflow_t) (_IO_FILE *);
 168 #define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
 169 #define _IO_WUNDERFLOW(FP) WJUMP0 (__underflow, FP)
 170
 171 /* The 'uflow' hook returns the next character in the input stream
 172    (cast to unsigned char), and increments the read position;
 173    EOF is returned on failure.
 174    It matches the streambuf::uflow virtual function, which is not in the
 175    cfront implementation, but was added to C++ by the ANSI/ISO committee. */
 176 #define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
 177 #define _IO_WUFLOW(FP) WJUMP0 (__uflow, FP)
 178
 179 /* The 'pbackfail' hook handles backing up.
 180    It matches the streambuf::pbackfail virtual function. */
 181 typedef int (*_IO_pbackfail_t) (_IO_FILE *, int);
 182 #define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
 183 #define _IO_WPBACKFAIL(FP, CH) WJUMP1 (__pbackfail, FP, CH)
 184
 185 /* The 'xsputn' hook writes upto N characters from buffer DATA.
 186    Returns EOF or the number of character actually written.
 187    It matches the streambuf::xsputn virtual function. */
 188 typedef _IO_size_t (*_IO_xsputn_t) (_IO_FILE *FP, const void *DATA,
 189                                     _IO_size_t N);
 190 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
 191 #define _IO_WXSPUTN(FP, DATA, N) WJUMP2 (__xsputn, FP, DATA, N)
 192
 193 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
 194    Returns the number of character actually read.
 195    It matches the streambuf::xsgetn virtual function. */
 196 typedef _IO_size_t (*_IO_xsgetn_t) (_IO_FILE *FP, void *DATA, _IO_size_t N);
 197 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
 198 #define _IO_WXSGETN(FP, DATA, N) WJUMP2 (__xsgetn, FP, DATA, N)
 199
 200 /* The 'seekoff' hook moves the stream position to a new position
 201    relative to the start of the file (if DIR==0), the current position
 202    (MODE==1), or the end of the file (MODE==2).
 203    It matches the streambuf::seekoff virtual function.
 204    It is also used for the ANSI fseek function. */
 205 typedef _IO_off64_t (*_IO_seekoff_t) (_IO_FILE *FP, _IO_off64_t OFF, int DIR,
 206                                       int MODE);
 207 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
 208 #define _IO_WSEEKOFF(FP, OFF, DIR, MODE) WJUMP3 (__seekoff, FP, OFF, DIR, MODE)
 209
 210 /* The 'seekpos' hook also moves the stream position,
 211    but to an absolute position given by a fpos64_t (seekpos).
 212    It matches the streambuf::seekpos virtual function.
 213    It is also used for the ANSI fgetpos and fsetpos functions.  */
 214 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
 215 typedef _IO_off64_t (*_IO_seekpos_t) (_IO_FILE *, _IO_off64_t, int);
 216 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS)
 217 #define _IO_WSEEKPOS(FP, POS, FLAGS) WJUMP2 (__seekpos, FP, POS, FLAGS)
 218
 219 /* The 'setbuf' hook gives a buffer to the file.
 220    It matches the streambuf::setbuf virtual function. */
 221 typedef _IO_FILE* (*_IO_setbuf_t) (_IO_FILE *, char *, _IO_ssize_t);
 222 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH)
 223 #define _IO_WSETBUF(FP, BUFFER, LENGTH) WJUMP2 (__setbuf, FP, BUFFER, LENGTH)
 224
 225 /* The 'sync' hook attempts to synchronize the internal data structures
 226    of the file with the external state.
 227    It matches the streambuf::sync virtual function. */
 228 typedef int (*_IO_sync_t) (_IO_FILE *);
 229 #define _IO_SYNC(FP) JUMP0 (__sync, FP)
 230 #define _IO_WSYNC(FP) WJUMP0 (__sync, FP)
 231
 232 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
 233    It matches the streambuf::doallocate virtual function, which is not
 234    in the ANSI/ISO C++ standard, but is part traditional implementations. */
 235 typedef int (*_IO_doallocate_t) (_IO_FILE *);
 236 #define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
 237 #define _IO_WDOALLOCATE(FP) WJUMP0 (__doallocate, FP)
 238
 239 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
 240    sysstat) are low-level hooks specific to this implementation.
 241    There is no correspondence in the ANSI/ISO C++ standard library.
 242    The hooks basically correspond to the Unix system functions
 243    (read, write, close, lseek, and stat) except that a _IO_FILE*
 244    parameter is used instead of an integer file descriptor;  the default
 245    implementation used for normal files just calls those functions.
 246    The advantage of overriding these functions instead of the higher-level
 247    ones (underflow, overflow etc) is that you can leave all the buffering
 248    higher-level functions.  */
 249
 250 /* The 'sysread' hook is used to read data from the external file into
 251    an existing buffer.  It generalizes the Unix read(2) function.
 252    It matches the streambuf::sys_read virtual function, which is
 253    specific to this implementation. */
 254 typedef _IO_ssize_t (*_IO_read_t) (_IO_FILE *, void *, _IO_ssize_t);
 255 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN)
 256 #define _IO_WSYSREAD(FP, DATA, LEN) WJUMP2 (__read, FP, DATA, LEN)
 257
 258 /* The 'syswrite' hook is used to write data from an existing buffer
 259    to an external file.  It generalizes the Unix write(2) function.
 260    It matches the streambuf::sys_write virtual function, which is
 261    specific to this implementation. */
 262 typedef _IO_ssize_t (*_IO_write_t) (_IO_FILE *, const void *, _IO_ssize_t);
 263 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
 264 #define _IO_WSYSWRITE(FP, DATA, LEN) WJUMP2 (__write, FP, DATA, LEN)
 265
 266 /* The 'sysseek' hook is used to re-position an external file.
 267    It generalizes the Unix lseek(2) function.
 268    It matches the streambuf::sys_seek virtual function, which is
 269    specific to this implementation. */
 270 typedef _IO_off64_t (*_IO_seek_t) (_IO_FILE *, _IO_off64_t, int);
 271 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
 272 #define _IO_WSYSSEEK(FP, OFFSET, MODE) WJUMP2 (__seek, FP, OFFSET, MODE)
 273
 274 /* The 'sysclose' hook is used to finalize (close, finish up) an
 275    external file.  It generalizes the Unix close(2) function.
 276    It matches the streambuf::sys_close virtual function, which is
 277    specific to this implementation. */
 278 typedef int (*_IO_close_t) (_IO_FILE *); /* finalize */
 279 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
 280 #define _IO_WSYSCLOSE(FP) WJUMP0 (__close, FP)
 281
 282 /* The 'sysstat' hook is used to get information about an external file
 283    into a struct stat buffer.  It generalizes the Unix fstat(2) call.
 284    It matches the streambuf::sys_stat virtual function, which is
 285    specific to this implementation. */
 286 typedef int (*_IO_stat_t) (_IO_FILE *, void *);
 287 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
 288 #define _IO_WSYSSTAT(FP, BUF) WJUMP1 (__stat, FP, BUF)
 289
 290 /* The 'showmany' hook can be used to get an image how much input is
 291    available.  In many cases the answer will be 0 which means unknown
 292    but some cases one can provide real information.  */
 293 typedef int (*_IO_showmanyc_t) (_IO_FILE *);
 294 #define _IO_SHOWMANYC(FP) JUMP0 (__showmanyc, FP)
 295 #define _IO_WSHOWMANYC(FP) WJUMP0 (__showmanyc, FP)
 296
 297 /* The 'imbue' hook is used to get information about the currently
 298    installed locales.  */
 299 typedef void (*_IO_imbue_t) (_IO_FILE *, void *);
 300 #define _IO_IMBUE(FP, LOCALE) JUMP1 (__imbue, FP, LOCALE)
 301 #define _IO_WIMBUE(FP, LOCALE) WJUMP1 (__imbue, FP, LOCALE)
 302
 303
 304 #define _IO_CHAR_TYPE char /* unsigned char ? */
 305 #define _IO_INT_TYPE int
 306
 307 struct _IO_jump_t
 308 {
 309     JUMP_FIELD(size_t, __dummy);
 310     JUMP_FIELD(size_t, __dummy2);
 311     JUMP_FIELD(_IO_finish_t, __finish);
 312     JUMP_FIELD(_IO_overflow_t, __overflow);
 313     JUMP_FIELD(_IO_underflow_t, __underflow);
 314     JUMP_FIELD(_IO_underflow_t, __uflow);
 315     JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
 316     /* showmany */
 317     JUMP_FIELD(_IO_xsputn_t, __xsputn);
 318     JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
 319     JUMP_FIELD(_IO_seekoff_t, __seekoff);
 320     JUMP_FIELD(_IO_seekpos_t, __seekpos);
 321     JUMP_FIELD(_IO_setbuf_t, __setbuf);
 322     JUMP_FIELD(_IO_sync_t, __sync);
 323     JUMP_FIELD(_IO_doallocate_t, __doallocate);
 324     JUMP_FIELD(_IO_read_t, __read);
 325     JUMP_FIELD(_IO_write_t, __write);
 326     JUMP_FIELD(_IO_seek_t, __seek);
 327     JUMP_FIELD(_IO_close_t, __close);
 328     JUMP_FIELD(_IO_stat_t, __stat);
 329     JUMP_FIELD(_IO_showmanyc_t, __showmanyc);
 330     JUMP_FIELD(_IO_imbue_t, __imbue);
 331 #if 0
 332     get_column;
 333     set_column;
 334 #endif
 335 };
 336
 337 /* We always allocate an extra word following an _IO_FILE.
 338    This contains a pointer to the function jump table used.
 339    This is for compatibility with C++ streambuf; the word can
 340    be used to smash to a pointer to a virtual function table. */
 341
 342 struct _IO_FILE_plus
 343 {
 344   _IO_FILE file;
 345   const struct _IO_jump_t *vtable;
 346 };
 347
 348 #ifdef _IO_USE_OLD_IO_FILE
 349 /* This structure is used by the compatibility code as if it were an
 350    _IO_FILE_plus, but has enough space to initialize the _mode argument
 351    of an _IO_FILE_complete.  */
 352 struct _IO_FILE_complete_plus
 353 {
 354   struct _IO_FILE_complete file;
 355   const struct _IO_jump_t *vtable;
 356 };
 357 #endif
 358
 359 /* Special file type for fopencookie function.  */
 360 struct _IO_cookie_file
 361 {
 362   struct _IO_FILE_plus __fp;
 363   void *__cookie;
 364   _IO_cookie_io_functions_t __io_functions;
 365 };
 366
 367 _IO_FILE *_IO_fopencookie (void *cookie, const char *mode,
 368                            _IO_cookie_io_functions_t io_functions);
 369
 370
 371 /* Iterator type for walking global linked list of _IO_FILE objects. */
 372
 373 typedef struct _IO_FILE *_IO_ITER;
 374
 375 /* Generic functions */
 376
 377 extern void _IO_switch_to_main_get_area (_IO_FILE *) __THROW;
 378 extern void _IO_switch_to_backup_area (_IO_FILE *) __THROW;
 379 extern int _IO_switch_to_get_mode (_IO_FILE *);
 380 libc_hidden_proto (_IO_switch_to_get_mode)
 381 extern void _IO_init (_IO_FILE *, int) __THROW;
 382 libc_hidden_proto (_IO_init)
 383 extern int _IO_sputbackc (_IO_FILE *, int) __THROW;
 384 libc_hidden_proto (_IO_sputbackc)
 385 extern int _IO_sungetc (_IO_FILE *) __THROW;
 386 extern void _IO_un_link (struct _IO_FILE_plus *) __THROW;
 387 libc_hidden_proto (_IO_un_link)
 388 extern void _IO_link_in (struct _IO_FILE_plus *) __THROW;
 389 libc_hidden_proto (_IO_link_in)
 390 extern void _IO_doallocbuf (_IO_FILE *) __THROW;
 391 libc_hidden_proto (_IO_doallocbuf)
 392 extern void _IO_unsave_markers (_IO_FILE *) __THROW;
 393 libc_hidden_proto (_IO_unsave_markers)
 394 extern void _IO_setb (_IO_FILE *, char *, char *, int) __THROW;
 395 libc_hidden_proto (_IO_setb)
 396 extern unsigned _IO_adjust_column (unsigned, const char *, int) __THROW;
 397 libc_hidden_proto (_IO_adjust_column)
 398 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
 399
 400 _IO_ssize_t _IO_least_wmarker (_IO_FILE *, wchar_t *) __THROW;
 401 libc_hidden_proto (_IO_least_wmarker)
 402 extern void _IO_switch_to_main_wget_area (_IO_FILE *) __THROW;
 403 libc_hidden_proto (_IO_switch_to_main_wget_area)
 404 extern void _IO_switch_to_wbackup_area (_IO_FILE *) __THROW;
 405 libc_hidden_proto (_IO_switch_to_wbackup_area)
 406 extern int _IO_switch_to_wget_mode (_IO_FILE *);
 407 libc_hidden_proto (_IO_switch_to_wget_mode)
 408 extern void _IO_wsetb (_IO_FILE *, wchar_t *, wchar_t *, int) __THROW;
 409 libc_hidden_proto (_IO_wsetb)
 410 extern wint_t _IO_sputbackwc (_IO_FILE *, wint_t) __THROW;
 411 libc_hidden_proto (_IO_sputbackwc)
 412 extern wint_t _IO_sungetwc (_IO_FILE *) __THROW;
 413 extern void _IO_wdoallocbuf (_IO_FILE *) __THROW;
 414 libc_hidden_proto (_IO_wdoallocbuf)
 415 extern void _IO_unsave_wmarkers (_IO_FILE *) __THROW;
 416 extern unsigned _IO_adjust_wcolumn (unsigned, const wchar_t *, int) __THROW;
 417 extern _IO_off64_t get_file_offset (_IO_FILE *fp);
 418
 419 /* Marker-related function. */
 420
 421 extern void _IO_init_marker (struct _IO_marker *, _IO_FILE *);
 422 extern void _IO_init_wmarker (struct _IO_marker *, _IO_FILE *);
 423 extern void _IO_remove_marker (struct _IO_marker *) __THROW;
 424 extern int _IO_marker_difference (struct _IO_marker *, struct _IO_marker *)
 425      __THROW;
 426 extern int _IO_marker_delta (struct _IO_marker *) __THROW;
 427 extern int _IO_wmarker_delta (struct _IO_marker *) __THROW;
 428 extern int _IO_seekmark (_IO_FILE *, struct _IO_marker *, int) __THROW;
 429 extern int _IO_seekwmark (_IO_FILE *, struct _IO_marker *, int) __THROW;
 430
 431 /* Functions for iterating global list and dealing with its lock */
 432
 433 extern _IO_ITER _IO_iter_begin (void) __THROW;
 434 libc_hidden_proto (_IO_iter_begin)
 435 extern _IO_ITER _IO_iter_end (void) __THROW;
 436 libc_hidden_proto (_IO_iter_end)
 437 extern _IO_ITER _IO_iter_next (_IO_ITER) __THROW;
 438 libc_hidden_proto (_IO_iter_next)
 439 extern _IO_FILE *_IO_iter_file (_IO_ITER) __THROW;
 440 libc_hidden_proto (_IO_iter_file)
 441 extern void _IO_list_lock (void) __THROW;
 442 libc_hidden_proto (_IO_list_lock)
 443 extern void _IO_list_unlock (void) __THROW;
 444 libc_hidden_proto (_IO_list_unlock)
 445 extern void _IO_list_resetlock (void) __THROW;
 446 libc_hidden_proto (_IO_list_resetlock)
 447
 448 /* Default jumptable functions. */
 449
 450 extern int _IO_default_underflow (_IO_FILE *) __THROW;
 451 extern int _IO_default_uflow (_IO_FILE *);
 452 libc_hidden_proto (_IO_default_uflow)
 453 extern wint_t _IO_wdefault_uflow (_IO_FILE *);
 454 libc_hidden_proto (_IO_wdefault_uflow)
 455 extern int _IO_default_doallocate (_IO_FILE *) __THROW;
 456 libc_hidden_proto (_IO_default_doallocate)
 457 extern int _IO_wdefault_doallocate (_IO_FILE *) __THROW;
 458 libc_hidden_proto (_IO_wdefault_doallocate)
 459 extern void _IO_default_finish (_IO_FILE *, int) __THROW;
 460 libc_hidden_proto (_IO_default_finish)
 461 extern void _IO_wdefault_finish (_IO_FILE *, int) __THROW;
 462 libc_hidden_proto (_IO_wdefault_finish)
 463 extern int _IO_default_pbackfail (_IO_FILE *, int) __THROW;
 464 libc_hidden_proto (_IO_default_pbackfail)
 465 extern wint_t _IO_wdefault_pbackfail (_IO_FILE *, wint_t) __THROW;
 466 libc_hidden_proto (_IO_wdefault_pbackfail)
 467 extern _IO_FILE* _IO_default_setbuf (_IO_FILE *, char *, _IO_ssize_t);
 468 extern _IO_size_t _IO_default_xsputn (_IO_FILE *, const void *, _IO_size_t);
 469 libc_hidden_proto (_IO_default_xsputn)
 470 extern _IO_size_t _IO_wdefault_xsputn (_IO_FILE *, const void *, _IO_size_t);
 471 libc_hidden_proto (_IO_wdefault_xsputn)
 472 extern _IO_size_t _IO_default_xsgetn (_IO_FILE *, void *, _IO_size_t);
 473 libc_hidden_proto (_IO_default_xsgetn)
 474 extern _IO_size_t _IO_wdefault_xsgetn (_IO_FILE *, void *, _IO_size_t);
 475 libc_hidden_proto (_IO_wdefault_xsgetn)
 476 extern _IO_off64_t _IO_default_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 477      __THROW;
 478 extern _IO_off64_t _IO_default_seekpos (_IO_FILE *, _IO_off64_t, int);
 479 extern _IO_ssize_t _IO_default_write (_IO_FILE *, const void *, _IO_ssize_t);
 480 extern _IO_ssize_t _IO_default_read (_IO_FILE *, void *, _IO_ssize_t);
 481 extern int _IO_default_stat (_IO_FILE *, void *) __THROW;
 482 extern _IO_off64_t _IO_default_seek (_IO_FILE *, _IO_off64_t, int) __THROW;
 483 extern int _IO_default_sync (_IO_FILE *) __THROW;
 484 #define _IO_default_close ((_IO_close_t) _IO_default_sync)
 485 extern int _IO_default_showmanyc (_IO_FILE *) __THROW;
 486 extern void _IO_default_imbue (_IO_FILE *, void *) __THROW;
 487
 488 extern const struct _IO_jump_t _IO_file_jumps;
 489 libc_hidden_proto (_IO_file_jumps)
 490 extern const struct _IO_jump_t _IO_file_jumps_mmap attribute_hidden;
 491 extern const struct _IO_jump_t _IO_file_jumps_maybe_mmap attribute_hidden;
 492 extern const struct _IO_jump_t _IO_wfile_jumps;
 493 libc_hidden_proto (_IO_wfile_jumps)
 494 extern const struct _IO_jump_t _IO_wfile_jumps_mmap attribute_hidden;
 495 extern const struct _IO_jump_t _IO_wfile_jumps_maybe_mmap attribute_hidden;
 496 extern const struct _IO_jump_t _IO_old_file_jumps attribute_hidden;
 497 extern const struct _IO_jump_t _IO_streambuf_jumps;
 498 extern const struct _IO_jump_t _IO_old_proc_jumps attribute_hidden;
 499 extern const struct _IO_jump_t _IO_str_jumps attribute_hidden;
 500 extern const struct _IO_jump_t _IO_wstr_jumps attribute_hidden;
 501 extern const struct _IO_codecvt __libio_codecvt attribute_hidden;
 502 extern int _IO_do_write (_IO_FILE *, const char *, _IO_size_t);
 503 libc_hidden_proto (_IO_do_write)
 504 extern int _IO_new_do_write (_IO_FILE *, const char *, _IO_size_t);
 505 extern int _IO_old_do_write (_IO_FILE *, const char *, _IO_size_t);
 506 extern int _IO_wdo_write (_IO_FILE *, const wchar_t *, _IO_size_t);
 507 libc_hidden_proto (_IO_wdo_write)
 508 extern int _IO_flush_all_lockp (int);
 509 extern int _IO_flush_all (void);
 510 libc_hidden_proto (_IO_flush_all)
 511 extern int _IO_cleanup (void);
 512 extern void _IO_flush_all_linebuffered (void);
 513 libc_hidden_proto (_IO_flush_all_linebuffered)
 514 extern int _IO_new_fgetpos (_IO_FILE *, _IO_fpos_t *);
 515 extern int _IO_old_fgetpos (_IO_FILE *, _IO_fpos_t *);
 516 extern int _IO_new_fsetpos (_IO_FILE *, const _IO_fpos_t *);
 517 extern int _IO_old_fsetpos (_IO_FILE *, const _IO_fpos_t *);
 518 extern int _IO_new_fgetpos64 (_IO_FILE *, _IO_fpos64_t *);
 519 extern int _IO_old_fgetpos64 (_IO_FILE *, _IO_fpos64_t *);
 520 extern int _IO_new_fsetpos64 (_IO_FILE *, const _IO_fpos64_t *);
 521 extern int _IO_old_fsetpos64 (_IO_FILE *, const _IO_fpos64_t *);
 522 extern void _IO_old_init (_IO_FILE *fp, int flags) __THROW;
 523
 524
 525 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 526 # define _IO_do_flush(_f) \
 527   ((_f)->_mode <= 0                                                           \
 528    ? _IO_do_write(_f, (_f)->_IO_write_base,                                   \
 529                   (_f)->_IO_write_ptr-(_f)->_IO_write_base)                   \
 530    : _IO_wdo_write(_f, (_f)->_wide_data->_IO_write_base,                      \
 531                    ((_f)->_wide_data->_IO_write_ptr                           \
 532                     - (_f)->_wide_data->_IO_write_base)))
 533 #else
 534 # define _IO_do_flush(_f) \
 535   _IO_do_write(_f, (_f)->_IO_write_base,                                      \
 536                (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 537 #endif
 538 #define _IO_old_do_flush(_f) \
 539   _IO_old_do_write(_f, (_f)->_IO_write_base, \
 540                    (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 541 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
 542 #define _IO_mask_flags(fp, f, mask) \
 543        ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
 544 #define _IO_setg(fp, eb, g, eg)  ((fp)->_IO_read_base = (eb),\
 545         (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
 546 #define _IO_wsetg(fp, eb, g, eg)  ((fp)->_wide_data->_IO_read_base = (eb),\
 547         (fp)->_wide_data->_IO_read_ptr = (g), \
 548         (fp)->_wide_data->_IO_read_end = (eg))
 549 #define _IO_setp(__fp, __p, __ep) \
 550        ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr \
 551         = __p, (__fp)->_IO_write_end = (__ep))
 552 #define _IO_wsetp(__fp, __p, __ep) \
 553        ((__fp)->_wide_data->_IO_write_base \
 554         = (__fp)->_wide_data->_IO_write_ptr = __p, \
 555         (__fp)->_wide_data->_IO_write_end = (__ep))
 556 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
 557 #define _IO_have_wbackup(fp) ((fp)->_wide_data->_IO_save_base != NULL)
 558 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
 559 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
 560 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
 561 #define _IO_wblen(fp) ((fp)->_wide_data->_IO_buf_end \
 562                        - (fp)->_wide_data->_IO_buf_base)
 563
 564 /* Jumptable functions for files. */
 565
 566 extern int _IO_file_doallocate (_IO_FILE *) __THROW;
 567 libc_hidden_proto (_IO_file_doallocate)
 568 extern _IO_FILE* _IO_file_setbuf (_IO_FILE *, char *, _IO_ssize_t);
 569 libc_hidden_proto (_IO_file_setbuf)
 570 extern _IO_off64_t _IO_file_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 571 libc_hidden_proto (_IO_file_seekoff)
 572 extern _IO_off64_t _IO_file_seekoff_mmap (_IO_FILE *, _IO_off64_t, int, int)
 573      __THROW;
 574 extern _IO_size_t _IO_file_xsputn (_IO_FILE *, const void *, _IO_size_t);
 575 libc_hidden_proto (_IO_file_xsputn)
 576 extern _IO_size_t _IO_file_xsgetn (_IO_FILE *, void *, _IO_size_t);
 577 libc_hidden_proto (_IO_file_xsgetn)
 578 extern int _IO_file_stat (_IO_FILE *, void *) __THROW;
 579 libc_hidden_proto (_IO_file_stat)
 580 extern int _IO_file_close (_IO_FILE *) __THROW;
 581 libc_hidden_proto (_IO_file_close)
 582 extern int _IO_file_close_mmap (_IO_FILE *) __THROW;
 583 extern int _IO_file_underflow (_IO_FILE *);
 584 libc_hidden_proto (_IO_file_underflow)
 585 extern int _IO_file_underflow_mmap (_IO_FILE *);
 586 extern int _IO_file_underflow_maybe_mmap (_IO_FILE *);
 587 extern int _IO_file_overflow (_IO_FILE *, int);
 588 libc_hidden_proto (_IO_file_overflow)
 589 #define _IO_file_is_open(__fp) ((__fp)->_fileno != -1)
 590 extern void _IO_file_init (struct _IO_FILE_plus *) __THROW;
 591 libc_hidden_proto (_IO_file_init)
 592 extern _IO_FILE* _IO_file_attach (_IO_FILE *, int);
 593 libc_hidden_proto (_IO_file_attach)
 594 extern _IO_FILE* _IO_file_open (_IO_FILE *, const char *, int, int, int, int);
 595 libc_hidden_proto (_IO_file_open)
 596 extern _IO_FILE* _IO_file_fopen (_IO_FILE *, const char *, const char *, int);
 597 libc_hidden_proto (_IO_file_fopen)
 598 extern _IO_ssize_t _IO_file_write (_IO_FILE *, const void *, _IO_ssize_t);
 599 extern _IO_ssize_t _IO_file_read (_IO_FILE *, void *, _IO_ssize_t);
 600 libc_hidden_proto (_IO_file_read)
 601 extern int _IO_file_sync (_IO_FILE *);
 602 libc_hidden_proto (_IO_file_sync)
 603 extern int _IO_file_close_it (_IO_FILE *);
 604 libc_hidden_proto (_IO_file_close_it)
 605 extern _IO_off64_t _IO_file_seek (_IO_FILE *, _IO_off64_t, int) __THROW;
 606 libc_hidden_proto (_IO_file_seek)
 607 extern void _IO_file_finish (_IO_FILE *, int);
 608 libc_hidden_proto (_IO_file_finish)
 609
 610 extern _IO_FILE* _IO_new_file_attach (_IO_FILE *, int);
 611 extern int _IO_new_file_close_it (_IO_FILE *);
 612 extern void _IO_new_file_finish (_IO_FILE *, int);
 613 extern _IO_FILE* _IO_new_file_fopen (_IO_FILE *, const char *, const char *,
 614                                      int);
 615 extern void _IO_no_init (_IO_FILE *, int, int, struct _IO_wide_data *,
 616                          const struct _IO_jump_t *) __THROW;
 617 extern void _IO_new_file_init (struct _IO_FILE_plus *) __THROW;
 618 extern _IO_FILE* _IO_new_file_setbuf (_IO_FILE *, char *, _IO_ssize_t);
 619 extern _IO_FILE* _IO_file_setbuf_mmap (_IO_FILE *, char *, _IO_ssize_t);
 620 extern int _IO_new_file_sync (_IO_FILE *);
 621 extern int _IO_new_file_underflow (_IO_FILE *);
 622 extern int _IO_new_file_overflow (_IO_FILE *, int);
 623 extern _IO_off64_t _IO_new_file_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 624 extern _IO_ssize_t _IO_new_file_write (_IO_FILE *, const void *, _IO_ssize_t);
 625 extern _IO_size_t _IO_new_file_xsputn (_IO_FILE *, const void *, _IO_size_t);
 626
 627 extern _IO_FILE* _IO_old_file_setbuf (_IO_FILE *, char *, _IO_ssize_t);
 628 extern _IO_off64_t _IO_old_file_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 629 extern _IO_size_t _IO_old_file_xsputn (_IO_FILE *, const void *, _IO_size_t);
 630 extern int _IO_old_file_underflow (_IO_FILE *);
 631 extern int _IO_old_file_overflow (_IO_FILE *, int);
 632 extern void _IO_old_file_init (struct _IO_FILE_plus *) __THROW;
 633 extern _IO_FILE* _IO_old_file_attach (_IO_FILE *, int);
 634 extern _IO_FILE* _IO_old_file_fopen (_IO_FILE *, const char *, const char *);
 635 extern _IO_ssize_t _IO_old_file_write (_IO_FILE *, const void *, _IO_ssize_t);
 636 extern int _IO_old_file_sync (_IO_FILE *);
 637 extern int _IO_old_file_close_it (_IO_FILE *);
 638 extern void _IO_old_file_finish (_IO_FILE *, int);
 639
 640 extern int _IO_wfile_doallocate (_IO_FILE *) __THROW;
 641 extern _IO_size_t _IO_wfile_xsputn (_IO_FILE *, const void *, _IO_size_t);
 642 libc_hidden_proto (_IO_wfile_xsputn)
 643 extern _IO_FILE* _IO_wfile_setbuf (_IO_FILE *, wchar_t *, _IO_ssize_t);
 644 extern wint_t _IO_wfile_sync (_IO_FILE *);
 645 libc_hidden_proto (_IO_wfile_sync)
 646 extern wint_t _IO_wfile_underflow (_IO_FILE *);
 647 libc_hidden_proto (_IO_wfile_underflow)
 648 extern wint_t _IO_wfile_overflow (_IO_FILE *, wint_t);
 649 libc_hidden_proto (_IO_wfile_overflow)
 650 extern _IO_off64_t _IO_wfile_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 651 libc_hidden_proto (_IO_wfile_seekoff)
 652
 653 /* Jumptable functions for proc_files. */
 654 extern _IO_FILE* _IO_proc_open (_IO_FILE *, const char *, const char *)
 655      __THROW;
 656 extern _IO_FILE* _IO_new_proc_open (_IO_FILE *, const char *, const char *)
 657      __THROW;
 658 extern _IO_FILE* _IO_old_proc_open (_IO_FILE *, const char *, const char *);
 659 extern int _IO_proc_close (_IO_FILE *) __THROW;
 660 extern int _IO_new_proc_close (_IO_FILE *) __THROW;
 661 extern int _IO_old_proc_close (_IO_FILE *);
 662
 663 /* Jumptable functions for strfiles. */
 664 extern int _IO_str_underflow (_IO_FILE *) __THROW;
 665 libc_hidden_proto (_IO_str_underflow)
 666 extern int _IO_str_overflow (_IO_FILE *, int) __THROW;
 667 libc_hidden_proto (_IO_str_overflow)
 668 extern int _IO_str_pbackfail (_IO_FILE *, int) __THROW;
 669 libc_hidden_proto (_IO_str_pbackfail)
 670 extern _IO_off64_t _IO_str_seekoff (_IO_FILE *, _IO_off64_t, int, int) __THROW;
 671 libc_hidden_proto (_IO_str_seekoff)
 672 extern void _IO_str_finish (_IO_FILE *, int) __THROW;
 673
 674 /* Other strfile functions */
 675 struct _IO_strfile_;
 676 extern void _IO_str_init_static (struct _IO_strfile_ *, char *, int, char *)
 677      __THROW;
 678 extern void _IO_str_init_readonly (struct _IO_strfile_ *, const char *, int)
 679      __THROW;
 680 extern _IO_ssize_t _IO_str_count (_IO_FILE *) __THROW;
 681
 682 /* And the wide character versions.  */
 683 extern void _IO_wstr_init_static (_IO_FILE *, wchar_t *, _IO_size_t, wchar_t *)
 684      __THROW;
 685 extern _IO_ssize_t _IO_wstr_count (_IO_FILE *) __THROW;
 686 extern _IO_wint_t _IO_wstr_overflow (_IO_FILE *, _IO_wint_t) __THROW;
 687 extern _IO_wint_t _IO_wstr_underflow (_IO_FILE *) __THROW;
 688 extern _IO_off64_t _IO_wstr_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 689      __THROW;
 690 extern _IO_wint_t _IO_wstr_pbackfail (_IO_FILE *, _IO_wint_t) __THROW;
 691 extern void _IO_wstr_finish (_IO_FILE *, int) __THROW;
 692
 693 extern int _IO_vasprintf (char **result_ptr, const char *format,
 694                           _IO_va_list args) __THROW;
 695 extern int _IO_vdprintf (int d, const char *format, _IO_va_list arg);
 696 extern int _IO_vsnprintf (char *string, _IO_size_t maxlen,
 697                           const char *format, _IO_va_list args) __THROW;
 698
 699
 700 extern _IO_size_t _IO_getline (_IO_FILE *,char *, _IO_size_t, int, int);
 701 libc_hidden_proto (_IO_getline)
 702 extern _IO_size_t _IO_getline_info (_IO_FILE *,char *, _IO_size_t,
 703                                     int, int, int *);
 704 libc_hidden_proto (_IO_getline_info)
 705 extern _IO_ssize_t _IO_getdelim (char **, _IO_size_t *, int, _IO_FILE *);
 706 extern _IO_size_t _IO_getwline (_IO_FILE *,wchar_t *, _IO_size_t, wint_t, int);
 707 extern _IO_size_t _IO_getwline_info (_IO_FILE *,wchar_t *, _IO_size_t,
 708                                      wint_t, int, wint_t *);
 709
 710 extern struct _IO_FILE_plus *_IO_list_all;
 711 libc_hidden_proto (_IO_list_all)
 712 extern void (*_IO_cleanup_registration_needed) (void);
 713
 714 extern void _IO_str_init_static_internal (struct _IO_strfile_ *, char *,
 715                                           _IO_size_t, char *) __THROW;
 716 extern _IO_off64_t _IO_seekoff_unlocked (_IO_FILE *, _IO_off64_t, int, int)
 717      attribute_hidden;
 718 extern _IO_off64_t _IO_seekpos_unlocked (_IO_FILE *, _IO_off64_t, int)
 719      attribute_hidden;
 720
 721 #ifndef EOF
 722 # define EOF (-1)
 723 #endif
 724 #ifndef NULL
 725 # if defined __GNUG__ && \
 726     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
 727 #  define NULL (__null)
 728 # else
 729 #  if !defined(__cplusplus)
 730 #   define NULL ((void*)0)
 731 #  else
 732 #   define NULL (0)
 733 #  endif
 734 # endif
 735 #endif
 736
 737 #if _G_HAVE_MMAP
 738
 739 # include <unistd.h>
 740 # include <fcntl.h>
 741 # include <sys/mman.h>
 742 # include <sys/param.h>
 743
 744 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 745 #  define MAP_ANONYMOUS MAP_ANON
 746 # endif
 747
 748 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
 749 #  undef _G_HAVE_MMAP
 750 #  define _G_HAVE_MMAP 0
 751 # endif
 752
 753 #endif /* _G_HAVE_MMAP */
 754
 755 #if _G_HAVE_MMAP
 756
 757 # ifdef _LIBC
 758 /* When using this code in the GNU libc we must not pollute the name space.  */
 759 #  define mmap __mmap
 760 #  define munmap __munmap
 761 #  define ftruncate __ftruncate
 762 # endif
 763 #endif /* _G_HAVE_MMAP */
 764
 765 #ifndef OS_FSTAT
 766 # define OS_FSTAT fstat
 767 #endif
 768 extern int _IO_vscanf (const char *, _IO_va_list) __THROW;
 769
 770 /* _IO_pos_BAD is an _IO_off64_t value indicating error, unknown, or EOF. */
 771 #ifndef _IO_pos_BAD
 772 # define _IO_pos_BAD ((_IO_off64_t) -1)
 773 #endif
 774 /* _IO_pos_adjust adjust an _IO_off64_t by some number of bytes. */
 775 #ifndef _IO_pos_adjust
 776 # define _IO_pos_adjust(pos, delta) ((pos) += (delta))
 777 #endif
 778 /* _IO_pos_0 is an _IO_off64_t value indicating beginning of file. */
 779 #ifndef _IO_pos_0
 780 # define _IO_pos_0 ((_IO_off64_t) 0)
 781 #endif
 782
 783 #ifdef __cplusplus
 784 }
 785 #endif
 786
 787 #ifdef _IO_MTSAFE_IO
 788 /* check following! */
 789 # ifdef _IO_USE_OLD_IO_FILE
 790 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 791        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 792          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 793          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
 794 # else
 795 #  if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 796 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 797        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 798          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 799          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock, _IO_pos_BAD,\
 800          NULL, WDP, 0 }
 801 #  else
 802 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 803        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 804          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 805          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock, _IO_pos_BAD,\
 806          0 }
 807 #  endif
 808 # endif
 809 #else
 810 # ifdef _IO_USE_OLD_IO_FILE
 811 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 812        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 813          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 814          0, _IO_pos_BAD }
 815 # else
 816 #  if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 817 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 818        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 819          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 820          0, _IO_pos_BAD, 0, 0, { 0 }, 0, _IO_pos_BAD, \
 821          NULL, WDP, 0 }
 822 #  else
 823 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 824        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 825          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 826          0, _IO_pos_BAD, 0, 0, { 0 }, 0, _IO_pos_BAD, \
 827          0 }
 828 #  endif
 829 # endif
 830 #endif
 831
 832 #define _IO_va_start(args, last) va_start(args, last)
 833
 834 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
 835
 836 #if 1
 837 # define COERCE_FILE(FILE) /* Nothing */
 838 #else
 839 /* This is part of the kludge for binary compatibility with old stdio. */
 840 # define COERCE_FILE(FILE) \
 841   (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
 842     && (FILE) = *(FILE**)&((int*)fp)[1])
 843 #endif
 844
 845 #ifdef EINVAL
 846 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
 847 #else
 848 # define MAYBE_SET_EINVAL /* nothing */
 849 #endif
 850
 851 #ifdef IO_DEBUG
 852 # define CHECK_FILE(FILE, RET) \
 853         if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
 854         else { COERCE_FILE(FILE); \
 855                if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
 856           { MAYBE_SET_EINVAL; return RET; }}
 857 #else
 858 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)
 859 #endif
 860
 861 static inline void
 862 __attribute__ ((__always_inline__))
 863 _IO_acquire_lock_fct (_IO_FILE **p)
 864 {
 865   _IO_FILE *fp = *p;
 866   if ((fp->_flags & _IO_USER_LOCK) == 0)
 867     _IO_funlockfile (fp);
 868 }
 869
 870 static inline void
 871 __attribute__ ((__always_inline__))
 872 _IO_acquire_lock_clear_flags2_fct (_IO_FILE **p)
 873 {
 874   _IO_FILE *fp = *p;
 875   fp->_flags2 &= ~(_IO_FLAGS2_FORTIFY | _IO_FLAGS2_SCANF_STD);
 876   if ((fp->_flags & _IO_USER_LOCK) == 0)
 877     _IO_funlockfile (fp);
 878 }
 879
 880 #if !defined _IO_MTSAFE_IO && IS_IN (libc)
 881 # define _IO_acquire_lock(_fp)                                                \
 882   do {                                                                        \
 883     _IO_FILE *_IO_acquire_lock_file = NULL
 884 # define _IO_acquire_lock_clear_flags2(_fp)                                   \
 885   do {                                                                        \
 886     _IO_FILE *_IO_acquire_lock_file = (_fp)
 887 # define _IO_release_lock(_fp)                                                \
 888     if (_IO_acquire_lock_file != NULL)                                        \
 889       _IO_acquire_lock_file->_flags2 &= ~(_IO_FLAGS2_FORTIFY                  \
 890                                           | _IO_FLAGS2_SCANF_STD);            \
 891   } while (0)
 892 #endif