libio/libioP.h

   1 /* Copyright (C) 1993, 1997-2003, 2004 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.
  18
  19    As a special exception, if you link the code in this file with
  20    files compiled with a GNU compiler to produce an executable,
  21    that does not cause the resulting executable to be covered by
  22    the GNU Lesser General Public License.  This exception does not
  23    however invalidate any other reasons why the executable file
  24    might be covered by the GNU Lesser General Public License.
  25    This exception applies to code released by its copyright holders
  26    in files containing the exception.  */
  27
  28 #include <errno.h>
  29 #ifndef __set_errno
  30 # define __set_errno(Val) errno = (Val)
  31 #endif
  32 #if defined __GLIBC__ && __GLIBC__ >= 2
  33 # include <bits/libc-lock.h>
  34 #else
  35 /*# include <comthread.h>*/
  36 #endif
  37
  38 #include "iolibio.h"
  39
  40 /* Control of exported symbols.  Used in glibc.  By default we don't
  41    do anything.  */
  42 #ifndef INTUSE
  43 # define INTUSE(name) name
  44 #endif
  45 #ifndef INTDEF
  46 # define INTDEF(name)
  47 #endif
  48 #ifndef INTDEF2
  49 # define INTDEF2(name)
  50 #endif
  51 #ifndef libc_hidden_proto
  52 # define libc_hidden_proto(name)
  53 #endif
  54 #ifndef libc_hidden_def
  55 # define libc_hidden_def(name)
  56 #endif
  57 #ifndef libc_hidden_weak
  58 # define libc_hidden_weak(name)
  59 #endif
  60
  61 #ifdef __cplusplus
  62 extern "C" {
  63 #endif
  64
  65 #define _IO_seek_set 0
  66 #define _IO_seek_cur 1
  67 #define _IO_seek_end 2
  68
  69 /* THE JUMPTABLE FUNCTIONS.
  70
  71  * The _IO_FILE type is used to implement the FILE type in GNU libc,
  72  * as well as the streambuf class in GNU iostreams for C++.
  73  * These are all the same, just used differently.
  74  * An _IO_FILE (or FILE) object is allows followed by a pointer to
  75  * a jump table (of pointers to functions).  The pointer is accessed
  76  * with the _IO_JUMPS macro.  The jump table has a eccentric format,
  77  * so as to be compatible with the layout of a C++ virtual function table.
  78  * (as implemented by g++).  When a pointer to a streambuf object is
  79  * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
  80  * happens to point to the virtual function table of the streambuf.
  81  * Thus the _IO_JUMPS function table used for C stdio/libio does
  82  * double duty as the virtual function table for C++ streambuf.
  83  *
  84  * The entries in the _IO_JUMPS function table (and hence also the
  85  * virtual functions of a streambuf) are described below.
  86  * The first parameter of each function entry is the _IO_FILE/streambuf
  87  * object being acted on (i.e. the 'this' parameter).
  88  */
  89
  90 #ifdef _LIBC
  91 # include <shlib-compat.h>
  92 # if !SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
  93    /* Setting this macro disables the use of the _vtable_offset
  94       bias in _IO_JUMPS_FUNCS, below.  That is only needed if we
  95       want to support old binaries (see oldfileops.c).  */
  96 #  define _G_IO_NO_BACKWARD_COMPAT 1
  97 # endif
  98 #endif
  99
 100 #if (!defined _IO_USE_OLD_IO_FILE \
 101      && (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0))
 102 # define _IO_JUMPS_OFFSET 1
 103 #endif
 104
 105 #define _IO_JUMPS(THIS) (THIS)->vtable
 106 #define _IO_WIDE_JUMPS(THIS) ((struct _IO_FILE *) (THIS))->_wide_data->_wide_vtable
 107 #define _IO_CHECK_WIDE(THIS) (((struct _IO_FILE *) (THIS))->_wide_data != NULL)
 108
 109 #if _IO_JUMPS_OFFSET
 110 # define _IO_JUMPS_FUNC(THIS) \
 111  (*(struct _IO_jump_t **) ((void *) &_IO_JUMPS ((struct _IO_FILE_plus *) (THIS)) \
 112                            + (THIS)->_vtable_offset))
 113 # define _IO_vtable_offset(THIS) (THIS)->_vtable_offset
 114 #else
 115 # define _IO_JUMPS_FUNC(THIS) _IO_JUMPS ((struct _IO_FILE_plus *) (THIS))
 116 # define _IO_vtable_offset(THIS) 0
 117 #endif
 118 #define _IO_WIDE_JUMPS_FUNC(THIS) _IO_WIDE_JUMPS(THIS)
 119 #ifdef _G_USING_THUNKS
 120 # define JUMP_FIELD(TYPE, NAME) TYPE NAME
 121 # define JUMP0(FUNC, THIS) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS)
 122 # define JUMP1(FUNC, THIS, X1) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1)
 123 # define JUMP2(FUNC, THIS, X1, X2) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1, X2)
 124 # define JUMP3(FUNC, THIS, X1,X2,X3) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1,X2, X3)
 125 # define JUMP_INIT(NAME, VALUE) VALUE
 126 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0)
 127
 128 # define WJUMP0(FUNC, THIS) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS)
 129 # define WJUMP1(FUNC, THIS, X1) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1)
 130 # define WJUMP2(FUNC, THIS, X1, X2) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1, X2)
 131 # define WJUMP3(FUNC, THIS, X1,X2,X3) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1,X2, X3)
 132 #else
 133 /* These macros will change when we re-implement vtables to use "thunks"! */
 134 # define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
 135 # define JUMP0(FUNC, THIS) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS)
 136 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1)
 137 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1, X2)
 138 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1,X2,X3)
 139 # define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
 140 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
 141
 142 # define WJUMP0(FUNC, THIS) _IO_WIDE_JUMPS_FUNC(THIS)->FUNC.pfn (THIS)
 143 # define WJUMP1(FUNC, THIS, X1) _IO_WIDE_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1)
 144 # define WJUMP2(FUNC, THIS, X1, X2) _IO_WIDE_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1, X2)
 145 # define WJUMP3(FUNC, THIS, X1,X2,X3) _IO_WIDE_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1,X2,X3)
 146 #endif
 147
 148 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
 149    It does not delete (free) it, but does everything else to finalize it.
 150    It matches the streambuf::~streambuf virtual destructor.  */
 151 typedef void (*_IO_finish_t) (_IO_FILE *, int); /* finalize */
 152 #define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
 153 #define _IO_WFINISH(FP) WJUMP1 (__finish, FP, 0)
 154
 155 /* The 'overflow' hook flushes the buffer.
 156    The second argument is a character, or EOF.
 157    It matches the streambuf::overflow virtual function. */
 158 typedef int (*_IO_overflow_t) (_IO_FILE *, int);
 159 #define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
 160 #define _IO_WOVERFLOW(FP, CH) WJUMP1 (__overflow, FP, CH)
 161
 162 /* The 'underflow' hook tries to fills the get buffer.
 163    It returns the next character (as an unsigned char) or EOF.  The next
 164    character remains in the get buffer, and the get position is not changed.
 165    It matches the streambuf::underflow virtual function. */
 166 typedef int (*_IO_underflow_t) (_IO_FILE *);
 167 #define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
 168 #define _IO_WUNDERFLOW(FP) WJUMP0 (__underflow, FP)
 169
 170 /* The 'uflow' hook returns the next character in the input stream
 171    (cast to unsigned char), and increments the read position;
 172    EOF is returned on failure.
 173    It matches the streambuf::uflow virtual function, which is not in the
 174    cfront implementation, but was added to C++ by the ANSI/ISO committee. */
 175 #define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
 176 #define _IO_WUFLOW(FP) WJUMP0 (__uflow, FP)
 177
 178 /* The 'pbackfail' hook handles backing up.
 179    It matches the streambuf::pbackfail virtual function. */
 180 typedef int (*_IO_pbackfail_t) (_IO_FILE *, int);
 181 #define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
 182 #define _IO_WPBACKFAIL(FP, CH) WJUMP1 (__pbackfail, FP, CH)
 183
 184 /* The 'xsputn' hook writes upto N characters from buffer DATA.
 185    Returns the number of character actually written.
 186    It matches the streambuf::xsputn virtual function. */
 187 typedef _IO_size_t (*_IO_xsputn_t) (_IO_FILE *FP, const void *DATA,
 188                                     _IO_size_t N);
 189 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
 190 #define _IO_WXSPUTN(FP, DATA, N) WJUMP2 (__xsputn, FP, DATA, N)
 191
 192 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
 193    Returns the number of character actually read.
 194    It matches the streambuf::xsgetn virtual function. */
 195 typedef _IO_size_t (*_IO_xsgetn_t) (_IO_FILE *FP, void *DATA, _IO_size_t N);
 196 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
 197 #define _IO_WXSGETN(FP, DATA, N) WJUMP2 (__xsgetn, FP, DATA, N)
 198
 199 /* The 'seekoff' hook moves the stream position to a new position
 200    relative to the start of the file (if DIR==0), the current position
 201    (MODE==1), or the end of the file (MODE==2).
 202    It matches the streambuf::seekoff virtual function.
 203    It is also used for the ANSI fseek function. */
 204 typedef _IO_off64_t (*_IO_seekoff_t) (_IO_FILE *FP, _IO_off64_t OFF, int DIR,
 205                                       int MODE);
 206 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
 207 #define _IO_WSEEKOFF(FP, OFF, DIR, MODE) WJUMP3 (__seekoff, FP, OFF, DIR, MODE)
 208
 209 /* The 'seekpos' hook also moves the stream position,
 210    but to an absolute position given by a fpos64_t (seekpos).
 211    It matches the streambuf::seekpos virtual function.
 212    It is also used for the ANSI fgetpos and fsetpos functions.  */
 213 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
 214 typedef _IO_off64_t (*_IO_seekpos_t) (_IO_FILE *, _IO_off64_t, int);
 215 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS)
 216 #define _IO_WSEEKPOS(FP, POS, FLAGS) WJUMP2 (__seekpos, FP, POS, FLAGS)
 217
 218 /* The 'setbuf' hook gives a buffer to the file.
 219    It matches the streambuf::setbuf virtual function. */
 220 typedef _IO_FILE* (*_IO_setbuf_t) (_IO_FILE *, char *, _IO_ssize_t);
 221 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH)
 222 #define _IO_WSETBUF(FP, BUFFER, LENGTH) WJUMP2 (__setbuf, FP, BUFFER, LENGTH)
 223
 224 /* The 'sync' hook attempts to synchronize the internal data structures
 225    of the file with the external state.
 226    It matches the streambuf::sync virtual function. */
 227 typedef int (*_IO_sync_t) (_IO_FILE *);
 228 #define _IO_SYNC(FP) JUMP0 (__sync, FP)
 229 #define _IO_WSYNC(FP) WJUMP0 (__sync, FP)
 230
 231 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
 232    It matches the streambuf::doallocate virtual function, which is not
 233    in the ANSI/ISO C++ standard, but is part traditional implementations. */
 234 typedef int (*_IO_doallocate_t) (_IO_FILE *);
 235 #define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
 236 #define _IO_WDOALLOCATE(FP) WJUMP0 (__doallocate, FP)
 237
 238 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
 239    sysstat) are low-level hooks specific to this implementation.
 240    There is no correspondence in the ANSI/ISO C++ standard library.
 241    The hooks basically correspond to the Unix system functions
 242    (read, write, close, lseek, and stat) except that a _IO_FILE*
 243    parameter is used instead of a integer file descriptor;  the default
 244    implementation used for normal files just calls those functions.
 245    The advantage of overriding these functions instead of the higher-level
 246    ones (underflow, overflow etc) is that you can leave all the buffering
 247    higher-level functions.  */
 248
 249 /* The 'sysread' hook is used to read data from the external file into
 250    an existing buffer.  It generalizes the Unix read(2) function.
 251    It matches the streambuf::sys_read virtual function, which is
 252    specific to this implementation. */
 253 typedef _IO_ssize_t (*_IO_read_t) (_IO_FILE *, void *, _IO_ssize_t);
 254 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN)
 255 #define _IO_WSYSREAD(FP, DATA, LEN) WJUMP2 (__read, FP, DATA, LEN)
 256
 257 /* The 'syswrite' hook is used to write data from an existing buffer
 258    to an external file.  It generalizes the Unix write(2) function.
 259    It matches the streambuf::sys_write virtual function, which is
 260    specific to this implementation. */
 261 typedef _IO_ssize_t (*_IO_write_t) (_IO_FILE *, const void *, _IO_ssize_t);
 262 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
 263 #define _IO_WSYSWRITE(FP, DATA, LEN) WJUMP2 (__write, FP, DATA, LEN)
 264
 265 /* The 'sysseek' hook is used to re-position an external file.
 266    It generalizes the Unix lseek(2) function.
 267    It matches the streambuf::sys_seek virtual function, which is
 268    specific to this implementation. */
 269 typedef _IO_off64_t (*_IO_seek_t) (_IO_FILE *, _IO_off64_t, int);
 270 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
 271 #define _IO_WSYSSEEK(FP, OFFSET, MODE) WJUMP2 (__seek, FP, OFFSET, MODE)
 272
 273 /* The 'sysclose' hook is used to finalize (close, finish up) an
 274    external file.  It generalizes the Unix close(2) function.
 275    It matches the streambuf::sys_close virtual function, which is
 276    specific to this implementation. */
 277 typedef int (*_IO_close_t) (_IO_FILE *); /* finalize */
 278 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
 279 #define _IO_WSYSCLOSE(FP) WJUMP0 (__close, FP)
 280
 281 /* The 'sysstat' hook is used to get information about an external file
 282    into a struct stat buffer.  It generalizes the Unix fstat(2) call.
 283    It matches the streambuf::sys_stat virtual function, which is
 284    specific to this implementation. */
 285 typedef int (*_IO_stat_t) (_IO_FILE *, void *);
 286 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
 287 #define _IO_WSYSSTAT(FP, BUF) WJUMP1 (__stat, FP, BUF)
 288
 289 /* The 'showmany' hook can be used to get an image how much input is
 290    available.  In many cases the answer will be 0 which means unknown
 291    but some cases one can provide real information.  */
 292 typedef int (*_IO_showmanyc_t) (_IO_FILE *);
 293 #define _IO_SHOWMANYC(FP) JUMP0 (__showmanyc, FP)
 294 #define _IO_WSHOWMANYC(FP) WJUMP0 (__showmanyc, FP)
 295
 296 /* The 'imbue' hook is used to get information about the currently
 297    installed locales.  */
 298 typedef void (*_IO_imbue_t) (_IO_FILE *, void *);
 299 #define _IO_IMBUE(FP, LOCALE) JUMP1 (__imbue, FP, LOCALE)
 300 #define _IO_WIMBUE(FP, LOCALE) WJUMP1 (__imbue, FP, LOCALE)
 301
 302
 303 #define _IO_CHAR_TYPE char /* unsigned char ? */
 304 #define _IO_INT_TYPE int
 305
 306 struct _IO_jump_t
 307 {
 308     JUMP_FIELD(_G_size_t, __dummy);
 309 #ifdef _G_USING_THUNKS
 310     JUMP_FIELD(_G_size_t, __dummy2);
 311 #endif
 312     JUMP_FIELD(_IO_finish_t, __finish);
 313     JUMP_FIELD(_IO_overflow_t, __overflow);
 314     JUMP_FIELD(_IO_underflow_t, __underflow);
 315     JUMP_FIELD(_IO_underflow_t, __uflow);
 316     JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
 317     /* showmany */
 318     JUMP_FIELD(_IO_xsputn_t, __xsputn);
 319     JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
 320     JUMP_FIELD(_IO_seekoff_t, __seekoff);
 321     JUMP_FIELD(_IO_seekpos_t, __seekpos);
 322     JUMP_FIELD(_IO_setbuf_t, __setbuf);
 323     JUMP_FIELD(_IO_sync_t, __sync);
 324     JUMP_FIELD(_IO_doallocate_t, __doallocate);
 325     JUMP_FIELD(_IO_read_t, __read);
 326     JUMP_FIELD(_IO_write_t, __write);
 327     JUMP_FIELD(_IO_seek_t, __seek);
 328     JUMP_FIELD(_IO_close_t, __close);
 329     JUMP_FIELD(_IO_stat_t, __stat);
 330     JUMP_FIELD(_IO_showmanyc_t, __showmanyc);
 331     JUMP_FIELD(_IO_imbue_t, __imbue);
 332 #if 0
 333     get_column;
 334     set_column;
 335 #endif
 336 };
 337
 338 /* We always allocate an extra word following an _IO_FILE.
 339    This contains a pointer to the function jump table used.
 340    This is for compatibility with C++ streambuf; the word can
 341    be used to smash to a pointer to a virtual function table. */
 342
 343 struct _IO_FILE_plus
 344 {
 345   _IO_FILE file;
 346   const struct _IO_jump_t *vtable;
 347 };
 348
 349 #ifdef _IO_USE_OLD_IO_FILE
 350 /* This structure is used by the compatibility code as if it were an
 351    _IO_FILE_plus, but has enough space to initialize the _mode argument
 352    of an _IO_FILE_complete.  */
 353 struct _IO_FILE_complete_plus
 354 {
 355   struct _IO_FILE_complete file;
 356   const struct _IO_jump_t *vtable;
 357 };
 358 #endif
 359
 360 /* Special file type for fopencookie function.  */
 361 struct _IO_cookie_file
 362 {
 363   struct _IO_FILE_plus __fp;
 364   void *__cookie;
 365   _IO_cookie_io_functions_t __io_functions;
 366 };
 367
 368 _IO_FILE *_IO_fopencookie (void *cookie, const char *mode,
 369                            _IO_cookie_io_functions_t io_functions);
 370
 371
 372 /* Iterator type for walking global linked list of _IO_FILE objects. */
 373
 374 typedef struct _IO_FILE *_IO_ITER;
 375
 376 /* Generic functions */
 377
 378 extern void _IO_switch_to_main_get_area (_IO_FILE *) __THROW;
 379 extern void _IO_switch_to_backup_area (_IO_FILE *) __THROW;
 380 extern int _IO_switch_to_get_mode (_IO_FILE *) __THROW;
 381 extern void _IO_init (_IO_FILE *, int) __THROW;
 382 extern int _IO_sputbackc (_IO_FILE *, int) __THROW;
 383 extern int _IO_sungetc (_IO_FILE *) __THROW;
 384 extern void _IO_un_link (struct _IO_FILE_plus *) __THROW;
 385 extern void _IO_link_in (struct _IO_FILE_plus *) __THROW;
 386 extern void _IO_doallocbuf (_IO_FILE *) __THROW;
 387 extern void _IO_unsave_markers (_IO_FILE *) __THROW;
 388 extern void _IO_setb (_IO_FILE *, char *, char *, int) __THROW;
 389 extern unsigned _IO_adjust_column (unsigned, const char *, int) __THROW;
 390 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
 391
 392 extern void _IO_switch_to_main_wget_area (_IO_FILE *) __THROW;
 393 extern void _IO_switch_to_wbackup_area (_IO_FILE *) __THROW;
 394 extern int _IO_switch_to_wget_mode (_IO_FILE *) __THROW;
 395 extern void _IO_wsetb (_IO_FILE *, wchar_t *, wchar_t *, int) __THROW;
 396 extern wint_t _IO_sputbackwc (_IO_FILE *, wint_t) __THROW;
 397 extern wint_t _IO_sungetwc (_IO_FILE *) __THROW;
 398 extern void _IO_wdoallocbuf (_IO_FILE *) __THROW;
 399 extern void _IO_unsave_wmarkers (_IO_FILE *) __THROW;
 400 extern unsigned _IO_adjust_wcolumn (unsigned, const wchar_t *, int) __THROW;
 401
 402 /* Marker-related function. */
 403
 404 extern void _IO_init_marker (struct _IO_marker *, _IO_FILE *) __THROW;
 405 extern void _IO_init_wmarker (struct _IO_marker *, _IO_FILE *) __THROW;
 406 extern void _IO_remove_marker (struct _IO_marker *) __THROW;
 407 extern int _IO_marker_difference (struct _IO_marker *, struct _IO_marker *)
 408      __THROW;
 409 extern int _IO_marker_delta (struct _IO_marker *) __THROW;
 410 extern int _IO_wmarker_delta (struct _IO_marker *) __THROW;
 411 extern int _IO_seekmark (_IO_FILE *, struct _IO_marker *, int) __THROW;
 412 extern int _IO_seekwmark (_IO_FILE *, struct _IO_marker *, int) __THROW;
 413
 414 /* Functions for iterating global list and dealing with its lock */
 415
 416 extern _IO_ITER _IO_iter_begin (void) __THROW;
 417 libc_hidden_proto (_IO_iter_begin)
 418 extern _IO_ITER _IO_iter_end (void) __THROW;
 419 libc_hidden_proto (_IO_iter_end)
 420 extern _IO_ITER _IO_iter_next (_IO_ITER) __THROW;
 421 libc_hidden_proto (_IO_iter_next)
 422 extern _IO_FILE *_IO_iter_file (_IO_ITER) __THROW;
 423 libc_hidden_proto (_IO_iter_file)
 424 extern void _IO_list_lock (void) __THROW;
 425 libc_hidden_proto (_IO_list_lock)
 426 extern void _IO_list_unlock (void) __THROW;
 427 libc_hidden_proto (_IO_list_unlock)
 428 extern void _IO_list_resetlock (void) __THROW;
 429 libc_hidden_proto (_IO_list_resetlock)
 430
 431 /* Default jumptable functions. */
 432
 433 extern int _IO_default_underflow (_IO_FILE *) __THROW;
 434 extern int _IO_default_uflow (_IO_FILE *) __THROW;
 435 extern wint_t _IO_wdefault_uflow (_IO_FILE *) __THROW;
 436 extern int _IO_default_doallocate (_IO_FILE *) __THROW;
 437 extern int _IO_wdefault_doallocate (_IO_FILE *) __THROW;
 438 extern void _IO_default_finish (_IO_FILE *, int) __THROW;
 439 extern void _IO_wdefault_finish (_IO_FILE *, int) __THROW;
 440 extern int _IO_default_pbackfail (_IO_FILE *, int) __THROW;
 441 extern wint_t _IO_wdefault_pbackfail (_IO_FILE *, wint_t) __THROW;
 442 extern _IO_FILE* _IO_default_setbuf (_IO_FILE *, char *, _IO_ssize_t) __THROW;
 443 extern _IO_size_t _IO_default_xsputn (_IO_FILE *, const void *, _IO_size_t)
 444      __THROW;
 445 extern _IO_size_t _IO_wdefault_xsputn (_IO_FILE *, const void *, _IO_size_t)
 446      __THROW;
 447 extern _IO_size_t _IO_default_xsgetn (_IO_FILE *, void *, _IO_size_t) __THROW;
 448 extern _IO_size_t _IO_wdefault_xsgetn (_IO_FILE *, void *, _IO_size_t) __THROW;
 449 extern _IO_off64_t _IO_default_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 450      __THROW;
 451 extern _IO_off64_t _IO_default_seekpos (_IO_FILE *, _IO_off64_t, int) __THROW;
 452 extern _IO_ssize_t _IO_default_write (_IO_FILE *, const void *, _IO_ssize_t)
 453      __THROW;
 454 extern _IO_ssize_t _IO_default_read (_IO_FILE *, void *, _IO_ssize_t) __THROW;
 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 struct _IO_codecvt __libio_codecvt attribute_hidden;
 476 extern int _IO_do_write (_IO_FILE *, const char *, _IO_size_t) __THROW;
 477 extern int _IO_new_do_write (_IO_FILE *, const char *, _IO_size_t) __THROW;
 478 extern int _IO_old_do_write (_IO_FILE *, const char *, _IO_size_t) __THROW;
 479 extern int _IO_wdo_write (_IO_FILE *, const wchar_t *, _IO_size_t) __THROW;
 480 extern int _IO_flush_all_lockp (int) __THROW;
 481 extern int _IO_flush_all (void) __THROW;
 482 extern int _IO_cleanup (void) __THROW;
 483 extern void _IO_flush_all_linebuffered (void) __THROW;
 484 extern int _IO_new_fgetpos (_IO_FILE *, _IO_fpos_t *) __THROW;
 485 extern int _IO_old_fgetpos (_IO_FILE *, _IO_fpos_t *) __THROW;
 486 extern int _IO_new_fsetpos (_IO_FILE *, const _IO_fpos_t *) __THROW;
 487 extern int _IO_old_fsetpos (_IO_FILE *, const _IO_fpos_t *) __THROW;
 488 extern int _IO_new_fgetpos64 (_IO_FILE *, _IO_fpos64_t *) __THROW;
 489 extern int _IO_old_fgetpos64 (_IO_FILE *, _IO_fpos64_t *) __THROW;
 490 extern int _IO_new_fsetpos64 (_IO_FILE *, const _IO_fpos64_t *) __THROW;
 491 extern int _IO_old_fsetpos64 (_IO_FILE *, const _IO_fpos64_t *) __THROW;
 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) __THROW;
 538 extern _IO_off64_t _IO_file_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 539      __THROW;
 540 extern _IO_off64_t _IO_file_seekoff_mmap (_IO_FILE *, _IO_off64_t, int, int)
 541      __THROW;
 542 extern _IO_size_t _IO_file_xsputn (_IO_FILE *, const void *, _IO_size_t)
 543      __THROW;
 544 extern _IO_size_t _IO_file_xsgetn (_IO_FILE *, void *, _IO_size_t) __THROW;
 545 extern int _IO_file_stat (_IO_FILE *, void *) __THROW;
 546 extern int _IO_file_close (_IO_FILE *) __THROW;
 547 extern int _IO_file_close_mmap (_IO_FILE *) __THROW;
 548 extern int _IO_file_underflow (_IO_FILE *) __THROW;
 549 extern int _IO_file_underflow_mmap (_IO_FILE *) __THROW;
 550 extern int _IO_file_underflow_maybe_mmap (_IO_FILE *) __THROW;
 551 extern int _IO_file_overflow (_IO_FILE *, int) __THROW;
 552 #define _IO_file_is_open(__fp) ((__fp)->_fileno != -1)
 553 extern void _IO_file_init (struct _IO_FILE_plus *) __THROW;
 554 extern _IO_FILE* _IO_file_attach (_IO_FILE *, int) __THROW;
 555 extern _IO_FILE* _IO_file_open (_IO_FILE *, const char *, int, int, int, int)
 556      __THROW;
 557 libc_hidden_proto (_IO_file_open)
 558 extern _IO_FILE* _IO_file_fopen (_IO_FILE *, const char *, const char *, int)
 559      __THROW;
 560 extern _IO_ssize_t _IO_file_write (_IO_FILE *, const void *, _IO_ssize_t)
 561      __THROW;
 562 extern _IO_ssize_t _IO_file_read (_IO_FILE *, void *, _IO_ssize_t) __THROW;
 563 extern int _IO_file_sync (_IO_FILE *) __THROW;
 564 extern int _IO_file_close_it (_IO_FILE *) __THROW;
 565 extern _IO_off64_t _IO_file_seek (_IO_FILE *, _IO_off64_t, int) __THROW;
 566 extern void _IO_file_finish (_IO_FILE *, int) __THROW;
 567
 568 extern _IO_FILE* _IO_new_file_attach (_IO_FILE *, int) __THROW;
 569 extern int _IO_new_file_close_it (_IO_FILE *) __THROW;
 570 extern void _IO_new_file_finish (_IO_FILE *, int) __THROW;
 571 extern _IO_FILE* _IO_new_file_fopen (_IO_FILE *, const char *, const char *,
 572                                      int) __THROW;
 573 extern void _IO_no_init (_IO_FILE *, int, int, struct _IO_wide_data *,
 574                          const struct _IO_jump_t *) __THROW;
 575 extern void _IO_new_file_init (struct _IO_FILE_plus *) __THROW;
 576 extern _IO_FILE* _IO_new_file_setbuf (_IO_FILE *, char *, _IO_ssize_t) __THROW;
 577 extern _IO_FILE* _IO_file_setbuf_mmap (_IO_FILE *, char *, _IO_ssize_t)
 578      __THROW;
 579 extern int _IO_new_file_sync (_IO_FILE *) __THROW;
 580 extern int _IO_new_file_underflow (_IO_FILE *) __THROW;
 581 extern int _IO_new_file_overflow (_IO_FILE *, int) __THROW;
 582 extern _IO_off64_t _IO_new_file_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 583      __THROW;
 584 extern _IO_ssize_t _IO_new_file_write (_IO_FILE *, const void *, _IO_ssize_t)
 585      __THROW;
 586 extern _IO_size_t _IO_new_file_xsputn (_IO_FILE *, const void *, _IO_size_t)
 587      __THROW;
 588
 589 extern _IO_FILE* _IO_old_file_setbuf (_IO_FILE *, char *, _IO_ssize_t) __THROW;
 590 extern _IO_off64_t _IO_old_file_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 591      __THROW;
 592 extern _IO_size_t _IO_old_file_xsputn (_IO_FILE *, const void *, _IO_size_t)
 593      __THROW;
 594 extern int _IO_old_file_underflow (_IO_FILE *) __THROW;
 595 extern int _IO_old_file_overflow (_IO_FILE *, int) __THROW;
 596 extern void _IO_old_file_init (struct _IO_FILE_plus *) __THROW;
 597 extern _IO_FILE* _IO_old_file_attach (_IO_FILE *, int) __THROW;
 598 extern _IO_FILE* _IO_old_file_fopen (_IO_FILE *, const char *, const char *)
 599      __THROW;
 600 extern _IO_ssize_t _IO_old_file_write (_IO_FILE *, const void *, _IO_ssize_t)
 601      __THROW;
 602 extern int _IO_old_file_sync (_IO_FILE *) __THROW;
 603 extern int _IO_old_file_close_it (_IO_FILE *) __THROW;
 604 extern void _IO_old_file_finish (_IO_FILE *, int) __THROW;
 605
 606 extern int _IO_wfile_doallocate (_IO_FILE *) __THROW;
 607 extern _IO_size_t _IO_wfile_xsputn (_IO_FILE *, const void *, _IO_size_t)
 608      __THROW;
 609 extern _IO_FILE* _IO_wfile_setbuf (_IO_FILE *, wchar_t *, _IO_ssize_t) __THROW;
 610 extern wint_t _IO_wfile_sync (_IO_FILE *) __THROW;
 611 extern wint_t _IO_wfile_underflow (_IO_FILE *) __THROW;
 612 extern wint_t _IO_wfile_overflow (_IO_FILE *, wint_t) __THROW;
 613 extern _IO_off64_t _IO_wfile_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 614      __THROW;
 615
 616 /* Jumptable functions for proc_files. */
 617 extern _IO_FILE* _IO_proc_open (_IO_FILE *, const char *, const char *)
 618      __THROW;
 619 extern _IO_FILE* _IO_new_proc_open (_IO_FILE *, const char *, const char *)
 620      __THROW;
 621 extern _IO_FILE* _IO_old_proc_open (_IO_FILE *, const char *, const char *)
 622      __THROW;
 623 extern int _IO_proc_close (_IO_FILE *) __THROW;
 624 extern int _IO_new_proc_close (_IO_FILE *) __THROW;
 625 extern int _IO_old_proc_close (_IO_FILE *) __THROW;
 626
 627 /* Jumptable functions for strfiles. */
 628 extern int _IO_str_underflow (_IO_FILE *) __THROW;
 629 extern int _IO_str_overflow (_IO_FILE *, int) __THROW;
 630 extern int _IO_str_pbackfail (_IO_FILE *, int) __THROW;
 631 extern _IO_off64_t _IO_str_seekoff (_IO_FILE *, _IO_off64_t, int, int) __THROW;
 632 extern void _IO_str_finish (_IO_FILE *, int) __THROW;
 633
 634 /* Other strfile functions */
 635 struct _IO_strfile_;
 636 extern void _IO_str_init_static (struct _IO_strfile_ *, char *, int, char *)
 637      __THROW;
 638 extern void _IO_str_init_readonly (struct _IO_strfile_ *, const char *, int)
 639      __THROW;
 640 extern _IO_ssize_t _IO_str_count (_IO_FILE *) __THROW;
 641
 642 /* And the wide character versions.  */
 643 extern void _IO_wstr_init_static (_IO_FILE *, wchar_t *, _IO_size_t, wchar_t *)
 644      __THROW;
 645 extern _IO_ssize_t _IO_wstr_count (_IO_FILE *) __THROW;
 646 extern _IO_wint_t _IO_wstr_overflow (_IO_FILE *, _IO_wint_t) __THROW;
 647 extern _IO_wint_t _IO_wstr_underflow (_IO_FILE *) __THROW;
 648 extern _IO_off64_t _IO_wstr_seekoff (_IO_FILE *, _IO_off64_t, int, int)
 649      __THROW;
 650 extern _IO_wint_t _IO_wstr_pbackfail (_IO_FILE *, _IO_wint_t) __THROW;
 651 extern void _IO_wstr_finish (_IO_FILE *, int) __THROW;
 652
 653 extern int _IO_vasprintf (char **result_ptr, __const char *format,
 654                           _IO_va_list args) __THROW;
 655 extern int _IO_vdprintf (int d, __const char *format, _IO_va_list arg) __THROW;
 656 extern int _IO_vsnprintf (char *string, _IO_size_t maxlen,
 657                           __const char *format, _IO_va_list args) __THROW;
 658
 659
 660 extern _IO_size_t _IO_getline (_IO_FILE *,char *, _IO_size_t, int, int)
 661      __THROW;
 662 extern _IO_size_t _IO_getline_info (_IO_FILE *,char *, _IO_size_t,
 663                                     int, int, int *) __THROW;
 664 extern _IO_ssize_t _IO_getdelim (char **, _IO_size_t *, int, _IO_FILE *)
 665      __THROW;
 666 extern _IO_size_t _IO_getwline (_IO_FILE *,wchar_t *, _IO_size_t, wint_t, int)
 667      __THROW;
 668 extern _IO_size_t _IO_getwline_info (_IO_FILE *,wchar_t *, _IO_size_t,
 669                                      wint_t, int, wint_t *) __THROW;
 670 extern double _IO_strtod (const char *, char **) __THROW;
 671 extern char *_IO_dtoa (double __d, int __mode, int __ndigits,
 672                        int *__decpt, int *__sign, char **__rve) __THROW;
 673 extern int _IO_outfloat (double __value, _IO_FILE *__sb, int __type,
 674                          int __width, int __precision, int __flags,
 675                          int __sign_mode, int __fill) __THROW;
 676
 677 extern struct _IO_FILE_plus *_IO_list_all;
 678 extern void (*_IO_cleanup_registration_needed) (void);
 679
 680 /* Prototype for functions with alternative entry point.  */
 681 extern int _IO_flush_all_internal (void) __THROW;
 682 extern unsigned _IO_adjust_column_internal (unsigned, const char *, int)
 683      __THROW;
 684
 685 extern int _IO_default_uflow_internal (_IO_FILE *) __THROW;
 686 extern void _IO_default_finish_internal (_IO_FILE *, int) __THROW;
 687 extern int _IO_default_pbackfail_internal (_IO_FILE *, int) __THROW;
 688 extern _IO_size_t _IO_default_xsputn_internal (_IO_FILE *, const void *,
 689                                                _IO_size_t) __THROW;
 690 extern _IO_size_t _IO_default_xsgetn_internal (_IO_FILE *, void *, _IO_size_t)
 691      __THROW;
 692 extern int _IO_default_doallocate_internal (_IO_FILE *) __THROW;
 693 extern void _IO_wdefault_finish_internal (_IO_FILE *, int) __THROW;
 694 extern wint_t _IO_wdefault_pbackfail_internal (_IO_FILE *, wint_t) __THROW;
 695 extern _IO_size_t _IO_wdefault_xsputn_internal (_IO_FILE *, const void *,
 696                                                 _IO_size_t) __THROW;
 697 extern _IO_size_t _IO_wdefault_xsgetn_internal (_IO_FILE *, void *,
 698                                                 _IO_size_t) __THROW;
 699 extern int _IO_wdefault_doallocate_internal (_IO_FILE *) __THROW;
 700 extern wint_t _IO_wdefault_uflow_internal (_IO_FILE *) __THROW;
 701
 702 extern int _IO_file_doallocate_internal (_IO_FILE *) __THROW;
 703 extern _IO_FILE* _IO_file_setbuf_internal (_IO_FILE *, char *, _IO_ssize_t)
 704      __THROW;
 705 extern _IO_off64_t _IO_file_seekoff_internal (_IO_FILE *, _IO_off64_t,
 706                                               int, int) __THROW;
 707 extern _IO_size_t _IO_file_xsputn_internal (_IO_FILE *, const void *,
 708                                             _IO_size_t) __THROW;
 709 extern _IO_size_t _IO_file_xsgetn_internal (_IO_FILE *, void *, _IO_size_t)
 710      __THROW;
 711 extern int _IO_file_stat_internal (_IO_FILE *, void *) __THROW;
 712 extern int _IO_file_close_internal (_IO_FILE *) __THROW;
 713 extern int _IO_file_close_it_internal (_IO_FILE *) __THROW;
 714 extern int _IO_file_underflow_internal (_IO_FILE *) __THROW;
 715 extern int _IO_file_overflow_internal (_IO_FILE *, int) __THROW;
 716 extern void _IO_file_init_internal (struct _IO_FILE_plus *) __THROW;
 717 extern _IO_FILE* _IO_file_attach_internal (_IO_FILE *, int) __THROW;
 718 extern _IO_FILE* _IO_file_fopen_internal (_IO_FILE *, const char *,
 719                                           const char *, int) __THROW;
 720 extern _IO_ssize_t _IO_file_read_internal (_IO_FILE *, void *,
 721                                            _IO_ssize_t) __THROW;
 722 extern int _IO_file_sync_internal (_IO_FILE *) __THROW;
 723 extern _IO_off64_t _IO_file_seek_internal (_IO_FILE *, _IO_off64_t, int)
 724      __THROW;
 725 extern void _IO_file_finish_internal (_IO_FILE *, int) __THROW;
 726
 727 extern _IO_size_t _IO_wfile_xsputn_internal (_IO_FILE *, const void *,
 728                                              _IO_size_t) __THROW;
 729 extern _IO_off64_t _IO_wfile_seekoff_internal (_IO_FILE *, _IO_off64_t,
 730                                                int, int) __THROW;
 731 extern wint_t _IO_wfile_sync_internal (_IO_FILE *) __THROW;
 732
 733 extern int _IO_str_underflow_internal (_IO_FILE *) __THROW;
 734 extern int _IO_str_overflow_internal (_IO_FILE *, int) __THROW;
 735 extern int _IO_str_pbackfail_internal (_IO_FILE *, int) __THROW;
 736 extern _IO_off64_t _IO_str_seekoff_internal (_IO_FILE *, _IO_off64_t,
 737                                              int, int) __THROW;
 738 extern void _IO_str_init_static_internal (struct _IO_strfile_ *, char *,
 739                                           _IO_size_t, char *) __THROW;
 740
 741 extern struct _IO_jump_t _IO_file_jumps_internal attribute_hidden;
 742 extern struct _IO_jump_t _IO_wfile_jumps_internal attribute_hidden;
 743
 744 extern struct _IO_FILE_plus *_IO_list_all_internal attribute_hidden;
 745
 746 extern void _IO_link_in_internal (struct _IO_FILE_plus *) __THROW;
 747 extern int _IO_sputbackc_internal (_IO_FILE *, int) __THROW;
 748 extern void _IO_wdoallocbuf_internal (_IO_FILE *) __THROW;
 749
 750 extern _IO_size_t _IO_sgetn_internal (_IO_FILE *, void *, _IO_size_t) __THROW;
 751 extern void _IO_flush_all_linebuffered_internal (void) __THROW;
 752 extern int _IO_switch_to_wget_mode_internal (_IO_FILE *) __THROW;
 753 extern void _IO_unsave_markers_internal (_IO_FILE *) __THROW;
 754 extern void _IO_switch_to_main_wget_area_internal (_IO_FILE *) __THROW;
 755 extern int _IO_wdo_write_internal (_IO_FILE *, const wchar_t *, _IO_size_t)
 756      __THROW;
 757 extern int _IO_do_write_internal (_IO_FILE *, const char *, _IO_size_t)
 758      __THROW;
 759 extern _IO_ssize_t _IO_padn_internal (_IO_FILE *, int, _IO_ssize_t) __THROW;
 760 extern _IO_size_t _IO_getline_info_internal (_IO_FILE *,char *, _IO_size_t,
 761                                              int, int, int *) __THROW;
 762 extern _IO_size_t _IO_getline_internal (_IO_FILE *, char *, _IO_size_t, int,
 763                                         int) __THROW;
 764 extern void _IO_free_wbackup_area_internal (_IO_FILE *) __THROW;
 765 extern void _IO_free_backup_area_internal (_IO_FILE *) __THROW;
 766 extern void _IO_switch_to_wbackup_area_internal (_IO_FILE *) __THROW;
 767 extern void _IO_setb_internal (_IO_FILE *, char *, char *, int) __THROW;
 768 extern wint_t _IO_sputbackwc_internal (_IO_FILE *, wint_t) __THROW;
 769 extern int _IO_switch_to_get_mode_internal (_IO_FILE *) __THROW;
 770 extern int _IO_vfscanf_internal (_IO_FILE * __restrict,
 771                                  const char * __restrict,
 772                                  _IO_va_list, int *__restrict);
 773 extern int _IO_vfprintf_internal (_IO_FILE *__restrict, const char *__restrict,
 774                                   _IO_va_list) __THROW;
 775 extern void _IO_doallocbuf_internal (_IO_FILE *) __THROW;
 776 extern void _IO_wsetb_internal (_IO_FILE *, wchar_t *, wchar_t *, int)
 777      __THROW;
 778 extern _IO_off64_t _IO_seekoff_unlocked (_IO_FILE *, _IO_off64_t, int, int)
 779      attribute_hidden __THROW;
 780 extern _IO_off64_t _IO_seekpos_unlocked (_IO_FILE *, _IO_off64_t, int)
 781      attribute_hidden __THROW;
 782 extern int _IO_putc_internal (int __c, _IO_FILE *__fp) __THROW;
 783 extern void _IO_init_internal (_IO_FILE *, int) __THROW;
 784 extern void _IO_un_link_internal (struct _IO_FILE_plus *) __THROW;
 785
 786 #ifndef EOF
 787 # define EOF (-1)
 788 #endif
 789 #ifndef NULL
 790 # if defined __GNUG__ && \
 791     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
 792 #  define NULL (__null)
 793 # else
 794 #  if !defined(__cplusplus)
 795 #   define NULL ((void*)0)
 796 #  else
 797 #   define NULL (0)
 798 #  endif
 799 # endif
 800 #endif
 801
 802 #if _G_HAVE_MMAP
 803
 804 # include <unistd.h>
 805 # include <fcntl.h>
 806 # include <sys/mman.h>
 807 # include <sys/param.h>
 808
 809 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 810 #  define MAP_ANONYMOUS MAP_ANON
 811 # endif
 812
 813 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
 814 #  undef _G_HAVE_MMAP
 815 #  define _G_HAVE_MMAP 0
 816 # endif
 817
 818 #endif /* _G_HAVE_MMAP */
 819
 820 #if _G_HAVE_MMAP
 821
 822 # ifdef _LIBC
 823 /* When using this code in the GNU libc we must not pollute the name space.  */
 824 #  define mmap __mmap
 825 #  define munmap __munmap
 826 #  define ftruncate __ftruncate
 827 # endif
 828
 829 # define ROUND_TO_PAGE(_S) \
 830        (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
 831
 832 # define FREE_BUF(_B, _S) \
 833        munmap ((_B), ROUND_TO_PAGE (_S))
 834 # define ALLOC_BUF(_B, _S, _R) \
 835        do {                                                                   \
 836           (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S),                        \
 837                                 PROT_READ | PROT_WRITE,                       \
 838                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);          \
 839           if ((_B) == (char *) MAP_FAILED)                                    \
 840             return (_R);                                                      \
 841        } while (0)
 842 # define ALLOC_WBUF(_B, _S, _R) \
 843        do {                                                                   \
 844           (_B) = (wchar_t *) mmap (0, ROUND_TO_PAGE (_S),                     \
 845                                    PROT_READ | PROT_WRITE,                    \
 846                                    MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);       \
 847           if ((_B) == (wchar_t *) MAP_FAILED)                                 \
 848             return (_R);                                                      \
 849        } while (0)
 850
 851 #else /* _G_HAVE_MMAP */
 852
 853 # define FREE_BUF(_B, _S) \
 854        free(_B)
 855 # define ALLOC_BUF(_B, _S, _R) \
 856        do {                                                                   \
 857           (_B) = (char*)malloc(_S);                                           \
 858           if ((_B) == NULL)                                                   \
 859             return (_R);                                                      \
 860        } while (0)
 861 # define ALLOC_WBUF(_B, _S, _R) \
 862        do {                                                                   \
 863           (_B) = (wchar_t *)malloc(_S);                                       \
 864           if ((_B) == NULL)                                                   \
 865             return (_R);                                                      \
 866        } while (0)
 867
 868 #endif /* _G_HAVE_MMAP */
 869
 870 #ifndef OS_FSTAT
 871 # define OS_FSTAT fstat
 872 #endif
 873 struct stat;
 874 extern _IO_ssize_t _IO_read (int, void *, _IO_size_t) __THROW;
 875 extern _IO_ssize_t _IO_write (int, const void *, _IO_size_t) __THROW;
 876 extern _IO_off64_t _IO_lseek (int, _IO_off64_t, int) __THROW;
 877 extern int _IO_close (int) __THROW;
 878 extern int _IO_fstat (int, struct stat *) __THROW;
 879 extern int _IO_vscanf (const char *, _IO_va_list) __THROW;
 880
 881 /* _IO_pos_BAD is an _IO_off64_t value indicating error, unknown, or EOF. */
 882 #ifndef _IO_pos_BAD
 883 # define _IO_pos_BAD ((_IO_off64_t) -1)
 884 #endif
 885 /* _IO_pos_adjust adjust an _IO_off64_t by some number of bytes. */
 886 #ifndef _IO_pos_adjust
 887 # define _IO_pos_adjust(pos, delta) ((pos) += (delta))
 888 #endif
 889 /* _IO_pos_0 is an _IO_off64_t value indicating beginning of file. */
 890 #ifndef _IO_pos_0
 891 # define _IO_pos_0 ((_IO_off64_t) 0)
 892 #endif
 893
 894 #ifdef __cplusplus
 895 }
 896 #endif
 897
 898 #ifdef _IO_MTSAFE_IO
 899 /* check following! */
 900 # ifdef _IO_USE_OLD_IO_FILE
 901 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 902        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 903          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 904          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
 905 # else
 906 #  if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 907 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 908        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 909          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 910          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock, _IO_pos_BAD,\
 911          NULL, WDP, 0 }
 912 #  else
 913 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 914        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 915          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 916          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock, _IO_pos_BAD,\
 917          0 }
 918 #  endif
 919 # endif
 920 #else
 921 # ifdef _IO_USE_OLD_IO_FILE
 922 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 923        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 924          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 925          0, _IO_pos_BAD }
 926 # else
 927 #  if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 928 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 929        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 930          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 931          0, _IO_pos_BAD, 0, 0, { 0 }, 0, _IO_pos_BAD, \
 932          NULL, WDP, 0 }
 933 #  else
 934 #   define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 935        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 936          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \
 937          0, _IO_pos_BAD, 0, 0, { 0 }, 0, _IO_pos_BAD, \
 938          0 }
 939 #  endif
 940 # endif
 941 #endif
 942
 943 /* VTABLE_LABEL defines NAME as of the CLASS class.
 944    CNLENGTH is strlen(#CLASS).  */
 945 #ifdef __GNUC__
 946 # if _G_VTABLE_LABEL_HAS_LENGTH
 947 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 948   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
 949 # else
 950 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 951   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
 952 # endif
 953 #endif /* __GNUC__ */
 954
 955 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
 956 # ifdef __GNUC__
 957 VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
 958 # else
 959 #  if _G_VTABLE_LABEL_HAS_LENGTH
 960 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
 961 #  else
 962 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
 963 #  endif
 964 # endif
 965 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
 966
 967 #if defined(__STDC__) || defined(__cplusplus)
 968 # define _IO_va_start(args, last) va_start(args, last)
 969 #else
 970 # define _IO_va_start(args, last) va_start(args)
 971 #endif
 972
 973 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
 974
 975 #if 1
 976 # define COERCE_FILE(FILE) /* Nothing */
 977 #else
 978 /* This is part of the kludge for binary compatibility with old stdio. */
 979 # define COERCE_FILE(FILE) \
 980   (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
 981     && (FILE) = *(FILE**)&((int*)fp)[1])
 982 #endif
 983
 984 #ifdef EINVAL
 985 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
 986 #else
 987 # define MAYBE_SET_EINVAL /* nothing */
 988 #endif
 989
 990 #ifdef IO_DEBUG
 991 # define CHECK_FILE(FILE, RET) \
 992         if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
 993         else { COERCE_FILE(FILE); \
 994                if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
 995           { MAYBE_SET_EINVAL; return RET; }}
 996 #else
 997 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)
 998 #endif
 999
1000 static inline void
1001 __attribute__ ((__always_inline__))
1002 _IO_acquire_lock_fct (_IO_FILE **p)
1003 {
1004   _IO_FILE *fp = *p;
1005   if ((fp->_flags & _IO_USER_LOCK) == 0)
1006     _IO_funlockfile (fp);
1007 }