libio/libioP.h

   1 /* Copyright (C) 1993, 1997, 1998, 1999 Free Software Foundation, Inc.
   2    This file is part of the GNU IO Library.
   3
   4    This library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public License as
   6    published by the Free Software Foundation; either version 2, or (at
   7    your option) any later version.
   8
   9    This library is distributed in the hope that it will be useful, but
  10    WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this library; see the file COPYING.  If not, write to
  16    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  17    MA 02111-1307, USA.
  18
  19    As a special exception, if you link this library with files
  20    compiled with a GNU compiler to produce an executable, this does
  21    not cause the resulting executable to be covered by the GNU General
  22    Public License.  This exception does not however invalidate any
  23    other reasons why the executable file might be covered by the GNU
  24    General Public License.  */
  25
  26 #include <errno.h>
  27 #ifndef __set_errno
  28 # define __set_errno(Val) errno = (Val)
  29 #endif
  30 #if defined __GLIBC__ && __GLIBC__ >= 2
  31 # include <bits/libc-lock.h>
  32 #else
  33 /*# include <comthread.h>*/
  34 #endif
  35
  36 #include "iolibio.h"
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 #define _IO_seek_set 0
  43 #define _IO_seek_cur 1
  44 #define _IO_seek_end 2
  45
  46 /* THE JUMPTABLE FUNCTIONS.
  47
  48  * The _IO_FILE type is used to implement the FILE type in GNU libc,
  49  * as well as the streambuf class in GNU iostreams for C++.
  50  * These are all the same, just used differently.
  51  * An _IO_FILE (or FILE) object is allows followed by a pointer to
  52  * a jump table (of pointers to functions).  The pointer is accessed
  53  * with the _IO_JUMPS macro.  The jump table has a eccentric format,
  54  * so as to be compatible with the layout of a C++ virtual function table.
  55  * (as implemented by g++).  When a pointer to a streambuf object is
  56  * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
  57  * happens to point to the virtual function table of the streambuf.
  58  * Thus the _IO_JUMPS function table used for C stdio/libio does
  59  * double duty as the virtual function table for C++ streambuf.
  60  *
  61  * The entries in the _IO_JUMPS function table (and hence also the
  62  * virtual functions of a streambuf) are described below.
  63  * The first parameter of each function entry is the _IO_FILE/streambuf
  64  * object being acted on (i.e. the 'this' parameter).
  65  */
  66
  67 #if (!defined _IO_USE_OLD_IO_FILE \
  68      && (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0))
  69 # define _IO_JUMPS_OFFSET 1
  70 #endif
  71
  72 #define _IO_JUMPS(THIS) ((struct _IO_FILE_plus *) (THIS))->vtable
  73 #define _IO_WIDE_JUMPS(THIS) ((struct _IO_FILE *) (THIS))->_wide_data->_wide_vtable
  74 #if _IO_JUMPS_OFFSET
  75 # define _IO_JUMPS_FUNC(THIS) \
  76  (*(struct _IO_jump_t **) ((void *) &((struct _IO_FILE_plus *) (THIS))->vtable\
  77                            + (THIS)->_vtable_offset))
  78 #else
  79 # define _IO_JUMPS_FUNC(THIS) _IO_JUMPS(THIS)
  80 #endif
  81 #ifdef _G_USING_THUNKS
  82 # define JUMP_FIELD(TYPE, NAME) TYPE NAME
  83 # define JUMP0(FUNC, THIS) _IO_JUMPS_FUNC(THIS)->FUNC (THIS)
  84 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS_FUNC(THIS)->FUNC (THIS, X1)
  85 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS_FUNC(THIS)->FUNC (THIS, X1, X2)
  86 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS_FUNC(THIS)->FUNC (THIS, X1,X2, X3)
  87 # define JUMP_INIT(NAME, VALUE) VALUE
  88 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0)
  89 #else
  90 /* These macros will change when we re-implement vtables to use "thunks"! */
  91 # define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
  92 # define JUMP0(FUNC, THIS) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS)
  93 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1)
  94 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1, X2)
  95 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS_FUNC(THIS)->FUNC.pfn (THIS, X1,X2,X3)
  96 # define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
  97 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
  98 #endif
  99
 100 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
 101    It does not delete (free) it, but does everything else to finalize it.
 102    It matches the streambuf::~streambuf virtual destructor.  */
 103 typedef void (*_IO_finish_t) __PMT ((_IO_FILE *, int)); /* finalize */
 104 #define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
 105
 106 /* The 'overflow' hook flushes the buffer.
 107    The second argument is a character, or EOF.
 108    It matches the streambuf::overflow virtual function. */
 109 typedef int (*_IO_overflow_t) __PMT ((_IO_FILE *, int));
 110 #define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
 111
 112 /* The 'underflow' hook tries to fills the get buffer.
 113    It returns the next character (as an unsigned char) or EOF.  The next
 114    character remains in the get buffer, and the get position is not changed.
 115    It matches the streambuf::underflow virtual function. */
 116 typedef int (*_IO_underflow_t) __PMT ((_IO_FILE *));
 117 #define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
 118
 119 /* The 'uflow' hook returns the next character in the input stream
 120    (cast to unsigned char), and increments the read position;
 121    EOF is returned on failure.
 122    It matches the streambuf::uflow virtual function, which is not in the
 123    cfront implementation, but was added to C++ by the ANSI/ISO committee. */
 124 #define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
 125
 126 /* The 'pbackfail' hook handles backing up.
 127    It matches the streambuf::pbackfail virtual function. */
 128 typedef int (*_IO_pbackfail_t) __PMT ((_IO_FILE *, int));
 129 #define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
 130
 131 /* The 'xsputn' hook writes upto N characters from buffer DATA.
 132    Returns the number of character actually written.
 133    It matches the streambuf::xsputn virtual function. */
 134 typedef _IO_size_t (*_IO_xsputn_t) __PMT ((_IO_FILE *FP, const void *DATA,
 135                                            _IO_size_t N));
 136 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
 137
 138 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
 139    Returns the number of character actually read.
 140    It matches the streambuf::xsgetn virtual function. */
 141 typedef _IO_size_t (*_IO_xsgetn_t) __PMT ((_IO_FILE *FP, void *DATA,
 142                                            _IO_size_t N));
 143 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
 144
 145 /* The 'seekoff' hook moves the stream position to a new position
 146    relative to the start of the file (if DIR==0), the current position
 147    (MODE==1), or the end of the file (MODE==2).
 148    It matches the streambuf::seekoff virtual function.
 149    It is also used for the ANSI fseek function. */
 150 typedef _IO_off64_t (*_IO_seekoff_t) __PMT ((_IO_FILE *FP, _IO_off64_t OFF,
 151                                              int DIR, int MODE));
 152 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
 153
 154 /* The 'seekpos' hook also moves the stream position,
 155    but to an absolute position given by a fpos64_t (seekpos).
 156    It matches the streambuf::seekpos virtual function.
 157    It is also used for the ANSI fgetpos and fsetpos functions.  */
 158 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
 159 typedef _IO_off64_t (*_IO_seekpos_t) __PMT ((_IO_FILE *, _IO_off64_t, int));
 160 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS)
 161
 162 /* The 'setbuf' hook gives a buffer to the file.
 163    It matches the streambuf::setbuf virtual function. */
 164 typedef _IO_FILE* (*_IO_setbuf_t) __PMT ((_IO_FILE *, char *, _IO_ssize_t));
 165 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH)
 166
 167 /* The 'sync' hook attempts to synchronize the internal data structures
 168    of the file with the external state.
 169    It matches the streambuf::sync virtual function. */
 170 typedef int (*_IO_sync_t) __PMT ((_IO_FILE *));
 171 #define _IO_SYNC(FP) JUMP0 (__sync, FP)
 172
 173 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
 174    It matches the streambuf::doallocate virtual function, which is not
 175    in the ANSI/ISO C++ standard, but is part traditional implementations. */
 176 typedef int (*_IO_doallocate_t) __PMT ((_IO_FILE *));
 177 #define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
 178
 179 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
 180    sysstat) are low-level hooks specific to this implementation.
 181    There is no correspondence in the ANSI/ISO C++ standard library.
 182    The hooks basically correspond to the Unix system functions
 183    (read, write, close, lseek, and stat) except that a _IO_FILE*
 184    parameter is used instead of a integer file descriptor;  the default
 185    implementation used for normal files just calls those functions.
 186    The advantage of overriding these functions instead of the higher-level
 187    ones (underflow, overflow etc) is that you can leave all the buffering
 188    higher-level functions.  */
 189
 190 /* The 'sysread' hook is used to read data from the external file into
 191    an existing buffer.  It generalizes the Unix read(2) function.
 192    It matches the streambuf::sys_read virtual function, which is
 193    specific to this implementation. */
 194 typedef _IO_ssize_t (*_IO_read_t) __PMT ((_IO_FILE *, void *, _IO_ssize_t));
 195 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN)
 196
 197 /* The 'syswrite' hook is used to write data from an existing buffer
 198    to an external file.  It generalizes the Unix write(2) function.
 199    It matches the streambuf::sys_write virtual function, which is
 200    specific to this implementation. */
 201 typedef _IO_ssize_t (*_IO_write_t) __PMT ((_IO_FILE *, const void *,
 202                                            _IO_ssize_t));
 203 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
 204
 205 /* The 'sysseek' hook is used to re-position an external file.
 206    It generalizes the Unix lseek(2) function.
 207    It matches the streambuf::sys_seek virtual function, which is
 208    specific to this implementation. */
 209 typedef _IO_off64_t (*_IO_seek_t) __PMT ((_IO_FILE *, _IO_off64_t, int));
 210 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
 211
 212 /* The 'sysclose' hook is used to finalize (close, finish up) an
 213    external file.  It generalizes the Unix close(2) function.
 214    It matches the streambuf::sys_close virtual function, which is
 215    specific to this implementation. */
 216 typedef int (*_IO_close_t) __PMT ((_IO_FILE *)); /* finalize */
 217 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
 218
 219 /* The 'sysstat' hook is used to get information about an external file
 220    into a struct stat buffer.  It generalizes the Unix fstat(2) call.
 221    It matches the streambuf::sys_stat virtual function, which is
 222    specific to this implementation. */
 223 typedef int (*_IO_stat_t) __PMT ((_IO_FILE *, void *));
 224 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
 225
 226 /* The 'showmany' hook can be used to get an image how much input is
 227    available.  In many cases the answer will be 0 which means unknown
 228    but some cases one can provide real information.  */
 229 typedef int (*_IO_showmanyc_t) __PMT ((_IO_FILE *));
 230 #define _IO_SHOWMANYC(FP) JUMP0 (__showmanyc, FP)
 231
 232 /* The 'imbue' hook is used to get information about the currently
 233    installed locales.  */
 234 typedef void (*_IO_imbue_t) __PMT ((_IO_FILE *, void *));
 235 #define _IO_IMBUE(FP, LOCALE) JUMP1 (__imbue, FP, LOCALE)
 236
 237
 238 #define _IO_CHAR_TYPE char /* unsigned char ? */
 239 #define _IO_INT_TYPE int
 240
 241 struct _IO_jump_t
 242 {
 243     JUMP_FIELD(_G_size_t, __dummy);
 244 #ifdef _G_USING_THUNKS
 245     JUMP_FIELD(_G_size_t, __dummy2);
 246 #endif
 247     JUMP_FIELD(_IO_finish_t, __finish);
 248     JUMP_FIELD(_IO_overflow_t, __overflow);
 249     JUMP_FIELD(_IO_underflow_t, __underflow);
 250     JUMP_FIELD(_IO_underflow_t, __uflow);
 251     JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
 252     /* showmany */
 253     JUMP_FIELD(_IO_xsputn_t, __xsputn);
 254     JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
 255     JUMP_FIELD(_IO_seekoff_t, __seekoff);
 256     JUMP_FIELD(_IO_seekpos_t, __seekpos);
 257     JUMP_FIELD(_IO_setbuf_t, __setbuf);
 258     JUMP_FIELD(_IO_sync_t, __sync);
 259     JUMP_FIELD(_IO_doallocate_t, __doallocate);
 260     JUMP_FIELD(_IO_read_t, __read);
 261     JUMP_FIELD(_IO_write_t, __write);
 262     JUMP_FIELD(_IO_seek_t, __seek);
 263     JUMP_FIELD(_IO_close_t, __close);
 264     JUMP_FIELD(_IO_stat_t, __stat);
 265     JUMP_FIELD(_IO_showmanyc_t, __showmanyc);
 266     JUMP_FIELD(_IO_imbue_t, __imbue);
 267 #if 0
 268     get_column;
 269     set_column;
 270 #endif
 271 };
 272
 273 /* We always allocate an extra word following an _IO_FILE.
 274    This contains a pointer to the function jump table used.
 275    This is for compatibility with C++ streambuf; the word can
 276    be used to smash to a pointer to a virtual function table. */
 277
 278 struct _IO_FILE_plus
 279 {
 280   _IO_FILE file;
 281   const struct _IO_jump_t *vtable;
 282 };
 283
 284 /* Generic functions */
 285
 286 extern void _IO_switch_to_main_get_area __P ((_IO_FILE *));
 287 extern void _IO_switch_to_backup_area __P ((_IO_FILE *));
 288 extern int _IO_switch_to_get_mode __P ((_IO_FILE *));
 289 extern void _IO_init __P ((_IO_FILE *, int));
 290 extern int _IO_sputbackc __P ((_IO_FILE *, int));
 291 extern int _IO_sungetc __P ((_IO_FILE *));
 292 extern void _IO_un_link __P ((_IO_FILE *));
 293 extern void _IO_link_in __P ((_IO_FILE *));
 294 extern void _IO_doallocbuf __P ((_IO_FILE *));
 295 extern void _IO_unsave_markers __P ((_IO_FILE *));
 296 extern void _IO_setb __P ((_IO_FILE *, char *, char *, int));
 297 extern unsigned _IO_adjust_column __P ((unsigned, const char *, int));
 298 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
 299
 300 extern void _IO_switch_to_main_wget_area __P ((_IO_FILE *));
 301 extern void _IO_switch_to_wbackup_area __P ((_IO_FILE *));
 302 extern int _IO_switch_to_wget_mode __P ((_IO_FILE *));
 303 extern void _IO_wsetb __P ((_IO_FILE *, wchar_t *, wchar_t *, int));
 304 extern wint_t _IO_sputbackwc __P ((_IO_FILE *, wint_t));
 305 extern wint_t _IO_sungetwc __P ((_IO_FILE *));
 306 extern void _IO_wdoallocbuf __P ((_IO_FILE *));
 307 extern void _IO_unsave_wmarkers __P ((_IO_FILE *));
 308 extern void _IO_wsetb __P ((_IO_FILE *, wchar_t *, wchar_t *, int));
 309 extern unsigned _IO_adjust_wcolumn __P ((unsigned, const wchar_t *, int));
 310
 311 /* Marker-related function. */
 312
 313 extern void _IO_init_marker __P ((struct _IO_marker *, _IO_FILE *));
 314 extern void _IO_init_wmarker __P ((struct _IO_marker *, _IO_FILE *));
 315 extern void _IO_remove_marker __P ((struct _IO_marker *));
 316 extern int _IO_marker_difference __P ((struct _IO_marker *,
 317                                        struct _IO_marker *));
 318 extern int _IO_marker_delta __P ((struct _IO_marker *));
 319 extern int _IO_wmarker_delta __P ((struct _IO_marker *));
 320 extern int _IO_seekmark __P ((_IO_FILE *, struct _IO_marker *, int));
 321 extern int _IO_seekwmark __P ((_IO_FILE *, struct _IO_marker *, int));
 322
 323 /* Default jumptable functions. */
 324
 325 extern int _IO_default_underflow __P ((_IO_FILE *));
 326 extern int _IO_default_uflow __P ((_IO_FILE *));
 327 extern wint_t _IO_wdefault_uflow __P ((_IO_FILE *));
 328 extern int _IO_default_doallocate __P ((_IO_FILE *));
 329 extern int _IO_wdefault_doallocate __P ((_IO_FILE *));
 330 extern void _IO_default_finish __P ((_IO_FILE *, int));
 331 extern void _IO_wdefault_finish __P ((_IO_FILE *, int));
 332 extern int _IO_default_pbackfail __P ((_IO_FILE *, int));
 333 extern wint_t _IO_wdefault_pbackfail __P ((_IO_FILE *, wint_t));
 334 extern _IO_FILE* _IO_default_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 335 extern _IO_FILE* _IO_wdefault_setbuf __P ((_IO_FILE *, wchar_t *,
 336                                            _IO_ssize_t));
 337 extern _IO_size_t _IO_default_xsputn __P ((_IO_FILE *, const void *,
 338                                            _IO_size_t));
 339 extern _IO_size_t _IO_wdefault_xsputn __P ((_IO_FILE *, const void *,
 340                                             _IO_size_t));
 341 extern _IO_size_t _IO_default_xsgetn __P ((_IO_FILE *, void *, _IO_size_t));
 342 extern _IO_size_t _IO_wdefault_xsgetn __P ((_IO_FILE *, void *, _IO_size_t));
 343 extern _IO_off64_t _IO_default_seekoff __P ((_IO_FILE *,
 344                                              _IO_off64_t, int, int));
 345 extern _IO_off64_t _IO_default_seekpos __P ((_IO_FILE *, _IO_off64_t, int));
 346 extern _IO_ssize_t _IO_default_write __P ((_IO_FILE *, const void *,
 347                                            _IO_ssize_t));
 348 extern _IO_ssize_t _IO_default_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 349 extern int _IO_default_stat __P ((_IO_FILE *, void *));
 350 extern _IO_off64_t _IO_default_seek __P ((_IO_FILE *, _IO_off64_t, int));
 351 extern int _IO_default_sync __P ((_IO_FILE *));
 352 #define _IO_default_close ((_IO_close_t) _IO_default_sync)
 353 extern int _IO_default_showmanyc __P ((_IO_FILE *));
 354 extern void _IO_default_imbue __P ((_IO_FILE *, void *));
 355
 356 extern struct _IO_jump_t _IO_file_jumps;
 357 extern struct _IO_jump_t _IO_wfile_jumps;
 358 extern struct _IO_jump_t _IO_old_file_jumps;
 359 extern struct _IO_jump_t _IO_streambuf_jumps;
 360 extern struct _IO_jump_t _IO_proc_jumps;
 361 extern struct _IO_jump_t _IO_old_proc_jumps;
 362 extern struct _IO_jump_t _IO_str_jumps;
 363 extern struct _IO_jump_t _IO_wstr_jumps;
 364 extern int _IO_do_write __P ((_IO_FILE *, const char *, _IO_size_t));
 365 extern int _IO_new_do_write __P ((_IO_FILE *, const char *, _IO_size_t));
 366 extern int _IO_old_do_write __P ((_IO_FILE *, const char *, _IO_size_t));
 367 extern int _IO_wdo_write __P ((_IO_FILE *, const wchar_t *, _IO_size_t));
 368 extern int _IO_flush_all __P ((void));
 369 extern int _IO_cleanup __P ((void));
 370 extern void _IO_flush_all_linebuffered __P ((void));
 371 extern int _IO_new_fgetpos __P ((_IO_FILE *, _IO_fpos_t *));
 372 extern int _IO_old_fgetpos __P ((_IO_FILE *, _IO_fpos_t *));
 373 extern int _IO_new_fsetpos __P ((_IO_FILE *, const _IO_fpos_t *));
 374 extern int _IO_old_fsetpos __P ((_IO_FILE *, const _IO_fpos_t *));
 375 extern int _IO_new_fgetpos64 __P ((_IO_FILE *, _IO_fpos64_t *));
 376 extern int _IO_old_fgetpos64 __P ((_IO_FILE *, _IO_fpos64_t *));
 377 extern int _IO_new_fsetpos64 __P ((_IO_FILE *, const _IO_fpos64_t *));
 378 extern int _IO_old_fsetpos64 __P ((_IO_FILE *, const _IO_fpos64_t *));
 379
 380
 381 #define _IO_do_flush(_f) \
 382   ((_f)->_mode <= 0                                                           \
 383    ? _IO_do_write(_f, (_f)->_IO_write_base,                                   \
 384                   (_f)->_IO_write_ptr-(_f)->_IO_write_base)                   \
 385    : _IO_wdo_write(_f, (_f)->_wide_data->_IO_write_base,                      \
 386                    ((_f)->_wide_data->_IO_write_ptr                           \
 387                     - (_f)->_wide_data->_IO_write_base)))
 388 #define _IO_old_do_flush(_f) \
 389   _IO_old_do_write(_f, (_f)->_IO_write_base, \
 390                    (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 391 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
 392 #define _IO_mask_flags(fp, f, mask) \
 393        ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
 394 #define _IO_setg(fp, eb, g, eg)  ((fp)->_IO_read_base = (eb),\
 395         (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
 396 #define _IO_wsetg(fp, eb, g, eg)  ((fp)->_wide_data->_IO_read_base = (eb),\
 397         (fp)->_wide_data->_IO_read_ptr = (g), \
 398         (fp)->_wide_data->_IO_read_end = (eg))
 399 #define _IO_setp(__fp, __p, __ep) \
 400        ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr \
 401         = __p, (__fp)->_IO_write_end = (__ep))
 402 #define _IO_wsetp(__fp, __p, __ep) \
 403        ((__fp)->_wide_data->_IO_write_base \
 404         = (__fp)->_wide_data->_IO_write_ptr = __p, \
 405         (__fp)->_wide_data->_IO_write_end = (__ep))
 406 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
 407 #define _IO_have_wbackup(fp) ((fp)->_wide_data->_IO_save_base != NULL)
 408 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
 409 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
 410 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
 411 #define _IO_wblen(fp) ((fp)->_wide_data->_IO_buf_end \
 412                        - (fp)->_wide_data->_IO_buf_base)
 413
 414 /* Jumptable functions for files. */
 415
 416 extern int _IO_file_doallocate __P ((_IO_FILE *));
 417 extern _IO_FILE* _IO_file_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 418 extern _IO_off64_t _IO_file_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 419 extern _IO_size_t _IO_file_xsputn __P ((_IO_FILE *, const void *, _IO_size_t));
 420 extern _IO_size_t _IO_file_xsgetn __P ((_IO_FILE *, void *, _IO_size_t));
 421 extern int _IO_file_stat __P ((_IO_FILE *, void *));
 422 extern int _IO_file_close __P ((_IO_FILE *));
 423 extern int _IO_file_underflow __P ((_IO_FILE *));
 424 extern int _IO_file_overflow __P ((_IO_FILE *, int));
 425 #define _IO_file_is_open(__fp) ((__fp)->_fileno != -1)
 426 extern void _IO_file_init __P ((_IO_FILE *));
 427 extern _IO_FILE* _IO_file_attach __P ((_IO_FILE *, int));
 428 extern _IO_FILE* _IO_file_open __P ((_IO_FILE *, const char *, int, int,
 429                                      int, int));
 430 extern _IO_FILE* _IO_file_fopen __P ((_IO_FILE *, const char *, const char *,
 431                                       int));
 432 extern _IO_ssize_t _IO_file_write __P ((_IO_FILE *, const void *,
 433                                         _IO_ssize_t));
 434 extern _IO_ssize_t _IO_file_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 435 extern int _IO_file_sync __P ((_IO_FILE *));
 436 extern int _IO_file_close_it __P ((_IO_FILE *));
 437 extern _IO_off64_t _IO_file_seek __P ((_IO_FILE *, _IO_off64_t, int));
 438 extern void _IO_file_finish __P ((_IO_FILE *, int));
 439
 440 extern _IO_FILE* _IO_new_file_attach __P ((_IO_FILE *, int));
 441 extern int _IO_new_file_close_it __P ((_IO_FILE *));
 442 extern void _IO_new_file_finish __P ((_IO_FILE *, int));
 443 extern _IO_FILE* _IO_new_file_fopen __P ((_IO_FILE *, const char *, const char *,
 444                                           int));
 445 extern void _IO_no_init __P ((_IO_FILE *, int, int, struct _IO_wide_data *,
 446                               struct _IO_jump_t *));
 447 extern void _IO_new_file_init __P ((_IO_FILE *));
 448 extern _IO_FILE* _IO_new_file_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 449 extern int _IO_new_file_sync __P ((_IO_FILE *));
 450 extern int _IO_new_file_underflow __P ((_IO_FILE *));
 451 extern int _IO_new_file_overflow __P ((_IO_FILE *, int));
 452 extern _IO_off64_t _IO_new_file_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 453 extern _IO_ssize_t _IO_new_file_write __P ((_IO_FILE *, const void *,
 454                                             _IO_ssize_t));
 455 extern _IO_size_t _IO_new_file_xsputn __P ((_IO_FILE *, const void *, _IO_size_t));
 456
 457 extern _IO_FILE* _IO_old_file_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 458 extern _IO_off64_t _IO_old_file_seekoff __P ((_IO_FILE *, _IO_off64_t, int,
 459                                               int));
 460 extern _IO_size_t _IO_old_file_xsputn __P ((_IO_FILE *, const void *,
 461                                             _IO_size_t));
 462 extern int _IO_old_file_underflow __P ((_IO_FILE *));
 463 extern int _IO_old_file_overflow __P ((_IO_FILE *, int));
 464 extern void _IO_old_file_init __P ((_IO_FILE *));
 465 extern _IO_FILE* _IO_old_file_attach __P ((_IO_FILE *, int));
 466 extern _IO_FILE* _IO_old_file_fopen __P ((_IO_FILE *, const char *,
 467                                           const char *));
 468 extern _IO_ssize_t _IO_old_file_write __P ((_IO_FILE *, const void *,
 469                                             _IO_ssize_t));
 470 extern int _IO_old_file_sync __P ((_IO_FILE *));
 471 extern int _IO_old_file_close_it __P ((_IO_FILE *));
 472 extern void _IO_old_file_finish __P ((_IO_FILE *, int));
 473
 474 extern int _IO_wfile_doallocate __P ((_IO_FILE *));
 475 extern _IO_size_t _IO_wfile_xsputn __P ((_IO_FILE *, const void *,
 476                                          _IO_size_t));
 477 extern _IO_FILE* _IO_wfile_setbuf __P ((_IO_FILE *, wchar_t *, _IO_ssize_t));
 478 extern wint_t _IO_wfile_sync __P ((_IO_FILE *));
 479 extern wint_t _IO_wfile_underflow __P ((_IO_FILE *));
 480 extern wint_t _IO_wfile_overflow __P ((_IO_FILE *, wint_t));
 481 extern _IO_off64_t _IO_wfile_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 482
 483 /* Jumptable functions for proc_files. */
 484 extern _IO_FILE* _IO_proc_open __P ((_IO_FILE *, const char *, const char *));
 485 extern _IO_FILE* _IO_new_proc_open __P ((_IO_FILE *, const char *, const char *));
 486 extern _IO_FILE* _IO_old_proc_open __P ((_IO_FILE *, const char *, const char *));
 487 extern int _IO_proc_close __P ((_IO_FILE *));
 488 extern int _IO_new_proc_close __P ((_IO_FILE *));
 489 extern int _IO_old_proc_close __P ((_IO_FILE *));
 490
 491 /* Jumptable functions for strfiles. */
 492 extern int _IO_str_underflow __P ((_IO_FILE *));
 493 extern int _IO_str_overflow __P ((_IO_FILE *, int));
 494 extern int _IO_str_pbackfail __P ((_IO_FILE *, int));
 495 extern _IO_off64_t _IO_str_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 496 extern void _IO_str_finish __P ((_IO_FILE *, int));
 497
 498 /* Other strfile functions */
 499 extern void _IO_str_init_static __P ((_IO_FILE *, char *, int, char *));
 500 extern void _IO_str_init_readonly __P ((_IO_FILE *, const char *, int));
 501 extern _IO_ssize_t _IO_str_count __P ((_IO_FILE *));
 502
 503 /* And the wide character versions.  */
 504 extern void _IO_wstr_init_static __P ((_IO_FILE *, wchar_t *, int, wchar_t *));
 505 extern void _IO_wstr_init_readonly __P ((_IO_FILE *, const char *, int));
 506 extern _IO_ssize_t _IO_wstr_count __P ((_IO_FILE *));
 507 extern _IO_wint_t _IO_wstr_overflow __P ((_IO_FILE *, _IO_wint_t));
 508 extern _IO_wint_t _IO_wstr_underflow __P ((_IO_FILE *));
 509 extern _IO_off64_t _IO_wstr_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 510 extern _IO_wint_t _IO_wstr_pbackfail __P ((_IO_FILE *, _IO_wint_t));
 511 extern void _IO_wstr_finish __P ((_IO_FILE *, int));
 512
 513 extern int _IO_vasprintf __P ((char **result_ptr, __const char *format,
 514                                _IO_va_list args));
 515 extern int _IO_vdprintf __P ((int d, __const char *format, _IO_va_list arg));
 516 extern int _IO_vsnprintf __P ((char *string, _IO_size_t maxlen,
 517                                __const char *format, _IO_va_list args));
 518
 519
 520 extern _IO_size_t _IO_getline __P ((_IO_FILE *,char *, _IO_size_t, int, int));
 521 extern _IO_size_t _IO_getline_info __P ((_IO_FILE *,char *, _IO_size_t,
 522                                          int, int, int *));
 523 extern _IO_ssize_t _IO_getdelim __P ((char **, _IO_size_t *, int, _IO_FILE *));
 524 extern _IO_size_t _IO_getwline __P ((_IO_FILE *,wchar_t *, _IO_size_t, wint_t,
 525                                      int));
 526 extern _IO_size_t _IO_getwline_info __P ((_IO_FILE *,wchar_t *, _IO_size_t,
 527                                           wint_t, int, wint_t *));
 528 extern double _IO_strtod __P ((const char *, char **));
 529 extern char *_IO_dtoa __P ((double __d, int __mode, int __ndigits,
 530                             int *__decpt, int *__sign, char **__rve));
 531 extern int _IO_outfloat __P ((double __value, _IO_FILE *__sb, int __type,
 532                               int __width, int __precision, int __flags,
 533                               int __sign_mode, int __fill));
 534
 535 extern _IO_FILE *_IO_list_all;
 536 extern void (*_IO_cleanup_registration_needed) __PMT ((void));
 537
 538 #ifndef EOF
 539 # define EOF (-1)
 540 #endif
 541 #ifndef NULL
 542 # if defined __GNUG__ && \
 543     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
 544 #  define NULL (__null)
 545 # else
 546 #  if !defined(__cplusplus)
 547 #   define NULL ((void*)0)
 548 #  else
 549 #   define NULL (0)
 550 #  endif
 551 # endif
 552 #endif
 553
 554 #if _G_HAVE_MMAP
 555
 556 # include <unistd.h>
 557 # include <fcntl.h>
 558 # include <sys/mman.h>
 559 # include <sys/param.h>
 560
 561 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 562 #  define MAP_ANONYMOUS MAP_ANON
 563 # endif
 564
 565 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
 566 #  undef _G_HAVE_MMAP
 567 #  define _G_HAVE_MMAP 0
 568 # endif
 569
 570 #endif /* _G_HAVE_MMAP */
 571
 572 #if _G_HAVE_MMAP
 573
 574 # ifdef _LIBC
 575 /* When using this code in the GNU libc we must not pollute the name space.  */
 576 #  define mmap __mmap
 577 #  define munmap __munmap
 578 #  define ftruncate __ftruncate
 579 # endif
 580
 581 # define ROUND_TO_PAGE(_S) \
 582        (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
 583
 584 # define FREE_BUF(_B, _S) \
 585        munmap ((_B), ROUND_TO_PAGE (_S))
 586 # define ALLOC_BUF(_B, _S, _R) \
 587        do {                                                                   \
 588           (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S),                        \
 589                                 PROT_READ | PROT_WRITE,                       \
 590                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);          \
 591           if ((_B) == (char *) MAP_FAILED)                                    \
 592             return (_R);                                                      \
 593        } while (0)
 594 # define ALLOC_WBUF(_B, _S, _R) \
 595        do {                                                                   \
 596           (_B) = (wchar_t *) mmap (0, ROUND_TO_PAGE (_S),                     \
 597                                    PROT_READ | PROT_WRITE,                    \
 598                                    MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);       \
 599           if ((_B) == (wchar_t *) MAP_FAILED)                                 \
 600             return (_R);                                                      \
 601        } while (0)
 602
 603 #else /* _G_HAVE_MMAP */
 604
 605 # define FREE_BUF(_B, _S) \
 606        free(_B)
 607 # define ALLOC_BUF(_B, _S, _R) \
 608        do {                                                                   \
 609           (_B) = (char*)malloc(_S);                                           \
 610           if ((_B) == NULL)                                                   \
 611             return (_R);                                                      \
 612        } while (0)
 613
 614 #endif /* _G_HAVE_MMAP */
 615
 616 #ifndef OS_FSTAT
 617 # define OS_FSTAT fstat
 618 #endif
 619 struct stat;
 620 extern _IO_ssize_t _IO_read __P ((int, void *, _IO_size_t));
 621 extern _IO_ssize_t _IO_write __P ((int, const void *, _IO_size_t));
 622 extern _IO_off64_t _IO_lseek __P ((int, _IO_off64_t, int));
 623 extern int _IO_close __P ((int));
 624 extern int _IO_fstat __P ((int, struct stat *));
 625 extern int _IO_vscanf __P ((const char *, _IO_va_list));
 626
 627 /* _IO_pos_BAD is an _IO_off64_t value indicating error, unknown, or EOF. */
 628 #ifndef _IO_pos_BAD
 629 # define _IO_pos_BAD ((_IO_off64_t) -1)
 630 #endif
 631 /* _IO_pos_adjust adjust an _IO_off64_t by some number of bytes. */
 632 #ifndef _IO_pos_adjust
 633 # define _IO_pos_adjust(pos, delta) ((pos) += (delta))
 634 #endif
 635 /* _IO_pos_0 is an _IO_off64_t value indicating beginning of file. */
 636 #ifndef _IO_pos_0
 637 # define _IO_pos_0 ((_IO_off64_t) 0)
 638 #endif
 639
 640 #ifdef __cplusplus
 641 }
 642 #endif
 643
 644 #ifdef _IO_MTSAFE_IO
 645 /* check following! */
 646 # ifdef _IO_USE_OLD_IO_FILE
 647 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 648        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 649          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
 650            0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
 651 # else
 652 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 653        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 654          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
 655          0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock, _IO_pos_BAD,\
 656          NULL, WDP, 0 }
 657 # endif
 658 #else
 659 # ifdef _IO_USE_OLD_IO_FILE
 660 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 661        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 662            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, 0, _IO_pos_BAD }
 663 # else
 664 #  define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \
 665        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 666          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
 667          0, _IO_pos_BAD, 0, 0, { 0 }, 0, _IO_pos_BAD, \
 668          NULL, WDP, 0 }
 669 # endif
 670 #endif
 671
 672 /* VTABLE_LABEL defines NAME as of the CLASS class.
 673    CNLENGTH is strlen(#CLASS).  */
 674 #ifdef __GNUC__
 675 # if _G_VTABLE_LABEL_HAS_LENGTH
 676 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 677   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
 678 # else
 679 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 680   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
 681 # endif
 682 #endif /* __GNUC__ */
 683
 684 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
 685 # ifdef __GNUC__
 686 VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
 687 # else
 688 #  if _G_VTABLE_LABEL_HAS_LENGTH
 689 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
 690 #  else
 691 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
 692 #  endif
 693 # endif
 694 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
 695
 696 #if defined(__STDC__) || defined(__cplusplus)
 697 # define _IO_va_start(args, last) va_start(args, last)
 698 #else
 699 # define _IO_va_start(args, last) va_start(args)
 700 #endif
 701
 702 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
 703
 704 #if 1
 705 # define COERCE_FILE(FILE) /* Nothing */
 706 #else
 707 /* This is part of the kludge for binary compatibility with old stdio. */
 708 # define COERCE_FILE(FILE) \
 709   (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
 710     && (FILE) = *(FILE**)&((int*)fp)[1])
 711 #endif
 712
 713 #ifdef EINVAL
 714 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
 715 #else
 716 # define MAYBE_SET_EINVAL /* nothing */
 717 #endif
 718
 719 #ifdef IO_DEBUG
 720 # define CHECK_FILE(FILE, RET) \
 721         if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
 722         else { COERCE_FILE(FILE); \
 723                if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
 724           { MAYBE_SET_EINVAL; return RET; }}
 725 #else
 726 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)
 727 #endif