libio/libioP.h

   1 /* Copyright (C) 1993, 1997 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 # if __GLIBC_MINOR__ > 0
  32 #  include <bits/libc-lock.h>
  33 # else
  34 #  include <libc-lock.h>
  35 # endif
  36 #else
  37 /*# include <comthread.h>*/
  38 #endif
  39
  40 #include "iolibio.h"
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 #define _IO_seek_set 0
  47 #define _IO_seek_cur 1
  48 #define _IO_seek_end 2
  49
  50 /* THE JUMPTABLE FUNCTIONS.
  51
  52  * The _IO_FILE type is used to implement the FILE type in GNU libc,
  53  * as well as the streambuf class in GNU iostreams for C++.
  54  * These are all the same, just used differently.
  55  * An _IO_FILE (or FILE) object is allows followed by a pointer to
  56  * a jump table (of pointers to functions).  The pointer is accessed
  57  * with the _IO_JUMPS macro.  The jump table has a eccentric format,
  58  * so as to be compatible with the layout of a C++ virtual function table.
  59  * (as implemented by g++).  When a pointer to a streambuf object is
  60  * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
  61  * happens to point to the virtual function table of the streambuf.
  62  * Thus the _IO_JUMPS function table used for C stdio/libio does
  63  * double duty as the virtual function table for C++ streambuf.
  64  *
  65  * The entries in the _IO_JUMPS function table (and hence also the
  66  * virtual functions of a streambuf) are described below.
  67  * The first parameter of each function entry is the _IO_FILE/streambuf
  68  * object being acted on (i.e. the 'this' parameter).
  69  */
  70
  71 #define _IO_JUMPS(THIS) ((struct _IO_FILE_plus *) (THIS))->vtable
  72 #ifdef _G_USING_THUNKS
  73 # define JUMP_FIELD(TYPE, NAME) TYPE NAME
  74 # define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC (THIS)
  75 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC (THIS, X1)
  76 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC (THIS, X1, X2)
  77 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC (THIS, X1,X2, X3)
  78 # define JUMP_INIT(NAME, VALUE) VALUE
  79 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0)
  80 #else
  81 /* These macros will change when we re-implement vtables to use "thunks"! */
  82 # define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
  83 # define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC.pfn (THIS)
  84 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1)
  85 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1, X2)
  86 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1,X2,X3)
  87 # define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
  88 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
  89 #endif
  90
  91 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
  92    It does not delete (free) it, but does everything else to finalize it/
  93    It matches the streambuf::~streambuf virtual destructor.  */
  94 typedef void (*_IO_finish_t) __P ((_IO_FILE *, int)); /* finalize */
  95 #define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
  96
  97 /* The 'overflow' hook flushes the buffer.
  98    The second argument is a character, or EOF.
  99    It matches the streambuf::overflow virtual function. */
 100 typedef int (*_IO_overflow_t) __P ((_IO_FILE *, int));
 101 #define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
 102
 103 /* The 'underflow' hook tries to fills the get buffer.
 104    It returns the next character (as an unsigned char) or EOF.  The next
 105    character remains in the get buffer, and the get position is not changed.
 106    It matches the streambuf::underflow virtual function. */
 107 typedef int (*_IO_underflow_t) __P ((_IO_FILE *));
 108 #define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
 109
 110 /* The 'uflow' hook returns the next character in the input stream
 111    (cast to unsigned char), and increments the read position;
 112    EOF is returned on failure.
 113    It matches the streambuf::uflow virtual function, which is not in the
 114    cfront implementation, but was added to C++ by the ANSI/ISO committee. */
 115 #define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
 116
 117 /* The 'pbackfail' hook handles backing up.
 118    It matches the streambuf::pbackfail virtual function. */
 119 typedef int (*_IO_pbackfail_t) __P ((_IO_FILE *, int));
 120 #define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
 121
 122 /* The 'xsputn' hook writes upto N characters from buffer DATA.
 123    Returns the number of character actually written.
 124    It matches the streambuf::xsputn virtual function. */
 125 typedef _IO_size_t (*_IO_xsputn_t) __P ((_IO_FILE *FP, const void *DATA,
 126                                          _IO_size_t N));
 127 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
 128
 129 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
 130    Returns the number of character actually read.
 131    It matches the streambuf::xsgetn virtual function. */
 132 typedef _IO_size_t (*_IO_xsgetn_t) __P ((_IO_FILE *FP, void *DATA,
 133                                          _IO_size_t N));
 134 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
 135
 136 /* The 'seekoff' hook moves the stream position to a new position
 137    relative to the start of the file (if DIR==0), the current position
 138    (MODE==1), or the end of the file (MODE==2).
 139    It matches the streambuf::seekoff virtual function.
 140    It is also used for the ANSI fseek function. */
 141 #if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 142 typedef _IO_fpos64_t (*_IO_seekoff_t) __P ((_IO_FILE *FP, _IO_off64_t OFF,
 143                                           int DIR, int MODE));
 144 #else
 145 typedef _IO_fpos_t (*_IO_seekoff_t) __P ((_IO_FILE *FP, _IO_off_t OFF,
 146                                           int DIR, int MODE));
 147 #endif
 148 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
 149
 150 /* The 'seekpos' hook also moves the stream position,
 151    but to an absolute position given by a fpos_t (seekpos).
 152    It matches the streambuf::seekpos virtual function.
 153    It is also used for the ANSI fgetpos and fsetpos functions.  */
 154 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
 155 #if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 156 typedef _IO_fpos64_t (*_IO_seekpos_t) __P ((_IO_FILE *, _IO_fpos64_t, int));
 157 #else
 158 typedef _IO_fpos_t (*_IO_seekpos_t) __P ((_IO_FILE *, _IO_fpos_t, int));
 159 #endif
 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) __P ((_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) __P ((_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) __P ((_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) __P ((_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) __P ((_IO_FILE *,const void *,_IO_ssize_t));
 202 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
 203
 204 /* The 'sysseek' hook is used to re-position an external file.
 205    It generalizes the Unix lseek(2) function.
 206    It matches the streambuf::sys_seek virtual function, which is
 207    specific to this implementation. */
 208 #if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 209 typedef _IO_fpos64_t (*_IO_seek_t) __P ((_IO_FILE *, _IO_off64_t, int));
 210 #else
 211 typedef _IO_fpos_t (*_IO_seek_t) __P ((_IO_FILE *, _IO_off_t, int));
 212 #endif
 213 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
 214
 215 /* The 'sysclose' hook is used to finalize (close, finish up) an
 216    external file.  It generalizes the Unix close(2) function.
 217    It matches the streambuf::sys_close virtual function, which is
 218    specific to this implementation. */
 219 typedef int (*_IO_close_t) __P ((_IO_FILE *)); /* finalize */
 220 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
 221
 222 /* The 'sysstat' hook is used to get information about an external file
 223    into a struct stat buffer.  It generalizes the Unix fstat(2) call.
 224    It matches the streambuf::sys_stat virtual function, which is
 225    specific to this implementation. */
 226 typedef int (*_IO_stat_t) __P ((_IO_FILE *, void *));
 227 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
 228
 229 #if _G_IO_IO_FILE_VERSION == 0x20001
 230 /* The 'showmany' hook can be used to get an image how much input is
 231    available.  In many cases the answer will be 0 which means unknown
 232    but some cases one can provide real information.  */
 233 typedef int (*_IO_showmanyc_t) __P ((_IO_FILE *));
 234 #define _IO_SHOWMANYC(FP) JUMP0 (__showmanyc, FP)
 235
 236 /* The 'imbue' hook is used to get information about the currently
 237    installed locales.  */
 238 typedef void (*_IO_imbue_t) __P ((_IO_FILE *, void *));
 239 #define _IO_IMBUE(FP, LOCALE) JUMP1 (__imbue, FP, LOCALE)
 240 #endif
 241
 242
 243 #define _IO_CHAR_TYPE char /* unsigned char ? */
 244 #define _IO_INT_TYPE int
 245
 246 struct _IO_jump_t
 247 {
 248     JUMP_FIELD(_G_size_t, __dummy);
 249 #ifdef _G_USING_THUNKS
 250     JUMP_FIELD(_G_size_t, __dummy2);
 251 #endif
 252     JUMP_FIELD(_IO_finish_t, __finish);
 253     JUMP_FIELD(_IO_overflow_t, __overflow);
 254     JUMP_FIELD(_IO_underflow_t, __underflow);
 255     JUMP_FIELD(_IO_underflow_t, __uflow);
 256     JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
 257     /* showmany */
 258     JUMP_FIELD(_IO_xsputn_t, __xsputn);
 259     JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
 260     JUMP_FIELD(_IO_seekoff_t, __seekoff);
 261     JUMP_FIELD(_IO_seekpos_t, __seekpos);
 262     JUMP_FIELD(_IO_setbuf_t, __setbuf);
 263     JUMP_FIELD(_IO_sync_t, __sync);
 264     JUMP_FIELD(_IO_doallocate_t, __doallocate);
 265     JUMP_FIELD(_IO_read_t, __read);
 266     JUMP_FIELD(_IO_write_t, __write);
 267     JUMP_FIELD(_IO_seek_t, __seek);
 268     JUMP_FIELD(_IO_close_t, __close);
 269     JUMP_FIELD(_IO_stat_t, __stat);
 270 #if _G_IO_IO_FILE_VERSION == 0x20001
 271     JUMP_FIELD(_IO_showmanyc_t, __showmanyc);
 272     JUMP_FIELD(_IO_imbue_t, __imbue);
 273 #endif
 274 #if 0
 275     get_column;
 276     set_column;
 277 #endif
 278 };
 279
 280 /* We always allocate an extra word following an _IO_FILE.
 281    This contains a pointer to the function jump table used.
 282    This is for compatibility with C++ streambuf; the word can
 283    be used to smash to a pointer to a virtual function table. */
 284
 285 struct _IO_FILE_plus
 286 {
 287   _IO_FILE file;
 288   const struct _IO_jump_t *vtable;
 289 };
 290
 291 /* Generic functions */
 292
 293 #if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 294 extern _IO_fpos64_t _IO_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 295 extern _IO_fpos64_t _IO_seekpos __P ((_IO_FILE *, _IO_fpos64_t, int));
 296 #else
 297 extern _IO_fpos_t _IO_seekoff __P ((_IO_FILE *, _IO_off_t, int, int));
 298 extern _IO_fpos_t _IO_seekpos __P ((_IO_FILE *, _IO_fpos_t, int));
 299 #endif
 300
 301 extern void _IO_switch_to_main_get_area __P ((_IO_FILE *));
 302 extern void _IO_switch_to_backup_area __P ((_IO_FILE *));
 303 extern int _IO_switch_to_get_mode __P ((_IO_FILE *));
 304 extern void _IO_init __P ((_IO_FILE *, int));
 305 extern int _IO_sputbackc __P ((_IO_FILE *, int));
 306 extern int _IO_sungetc __P ((_IO_FILE *));
 307 extern void _IO_un_link __P ((_IO_FILE *));
 308 extern void _IO_link_in __P ((_IO_FILE *));
 309 extern void _IO_doallocbuf __P ((_IO_FILE *));
 310 extern void _IO_unsave_markers __P ((_IO_FILE *));
 311 extern void _IO_setb __P ((_IO_FILE *, char *, char *, int));
 312 extern unsigned _IO_adjust_column __P ((unsigned, const char *, int));
 313 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
 314
 315 /* Marker-related function. */
 316
 317 extern void _IO_init_marker __P ((struct _IO_marker *, _IO_FILE *));
 318 extern void _IO_remove_marker __P ((struct _IO_marker *));
 319 extern int _IO_marker_difference __P ((struct _IO_marker *,
 320                                        struct _IO_marker *));
 321 extern int _IO_marker_delta __P ((struct _IO_marker *));
 322 extern int _IO_seekmark __P ((_IO_FILE *, struct _IO_marker *, int));
 323
 324 /* Default jumptable functions. */
 325
 326 extern int _IO_default_underflow __P ((_IO_FILE *));
 327 extern int _IO_default_uflow __P ((_IO_FILE *));
 328 extern int _IO_default_doallocate __P ((_IO_FILE *));
 329 extern void _IO_default_finish __P ((_IO_FILE *, int));
 330 extern int _IO_default_pbackfail __P ((_IO_FILE *, int));
 331 extern _IO_FILE* _IO_default_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 332 extern _IO_size_t _IO_default_xsputn __P ((_IO_FILE *, const void *,
 333                                            _IO_size_t));
 334 extern _IO_size_t _IO_default_xsgetn __P ((_IO_FILE *, void *, _IO_size_t));
 335 #if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 336 extern _IO_fpos64_t _IO_default_seekoff __P ((_IO_FILE *,
 337                                               _IO_off64_t, int, int));
 338 extern _IO_fpos64_t _IO_default_seekpos __P ((_IO_FILE *,
 339                                               _IO_fpos64_t, int));
 340 #else
 341 extern _IO_fpos_t _IO_default_seekoff __P ((_IO_FILE *, _IO_off_t, int, int));
 342 extern _IO_fpos_t _IO_default_seekpos __P ((_IO_FILE *, _IO_fpos_t, int));
 343 #endif
 344 extern _IO_ssize_t _IO_default_write __P ((_IO_FILE *, const void *,
 345                                            _IO_ssize_t));
 346 extern _IO_ssize_t _IO_default_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 347 extern int _IO_default_stat __P ((_IO_FILE *, void *));
 348 #if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 349 extern _IO_fpos64_t _IO_default_seek __P ((_IO_FILE *, _IO_off64_t, int));
 350 #else
 351 extern _IO_fpos_t _IO_default_seek __P ((_IO_FILE *, _IO_off_t, int));
 352 #endif
 353 extern int _IO_default_sync __P ((_IO_FILE *));
 354 #define _IO_default_close ((_IO_close_t) _IO_default_sync)
 355
 356 extern struct _IO_jump_t _IO_file_jumps;
 357 extern struct _IO_jump_t _IO_streambuf_jumps;
 358 extern struct _IO_jump_t _IO_proc_jumps;
 359 extern struct _IO_jump_t _IO_str_jumps;
 360 extern int _IO_do_write __P ((_IO_FILE *, const char *, _IO_size_t));
 361 extern int _IO_flush_all __P ((void));
 362 extern void _IO_cleanup __P ((void));
 363 extern void _IO_flush_all_linebuffered __P ((void));
 364
 365 #define _IO_do_flush(_f) \
 366   _IO_do_write(_f, (_f)->_IO_write_base, \
 367                (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 368 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
 369 #define _IO_mask_flags(fp, f, mask) \
 370        ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
 371 #define _IO_setg(fp, eb, g, eg)  ((fp)->_IO_read_base = (eb),\
 372         (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
 373 #define _IO_setp(__fp, __p, __ep) \
 374        ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
 375 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
 376 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
 377 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
 378 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
 379
 380 /* Jumptable functions for files. */
 381
 382 extern int _IO_file_doallocate __P ((_IO_FILE *));
 383 extern _IO_FILE* _IO_file_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 384 #if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 385 extern _IO_fpos64_t _IO_file_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 386 extern _IO_fpos64_t _IO_file_seek __P ((_IO_FILE *, _IO_off64_t, int));
 387 #else
 388 extern _IO_fpos_t _IO_file_seekoff __P ((_IO_FILE *, _IO_off_t, int, int));
 389 extern _IO_fpos_t _IO_file_seek __P ((_IO_FILE *, _IO_off_t, int));
 390 #endif
 391 extern _IO_size_t _IO_file_xsputn __P ((_IO_FILE *, const void *, _IO_size_t));
 392 extern int _IO_file_stat __P ((_IO_FILE *, void *));
 393 extern int _IO_file_close __P ((_IO_FILE *));
 394 extern int _IO_file_underflow __P ((_IO_FILE *));
 395 extern int _IO_file_overflow __P ((_IO_FILE *, int));
 396 #define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
 397 extern void _IO_file_init __P ((_IO_FILE *));
 398 extern _IO_FILE* _IO_file_attach __P ((_IO_FILE *, int));
 399 extern _IO_FILE* _IO_file_open __P ((_IO_FILE *, const char *, int, int,
 400                                      int, int));
 401 #if _G_IO_IO_FILE_VERSION == 0x20001
 402 extern _IO_FILE* _IO_file_fopen __P ((_IO_FILE *, const char *, const char *,
 403                                       int));
 404 #else
 405 extern _IO_FILE* _IO_file_fopen __P ((_IO_FILE *, const char *, const char *));
 406 #endif
 407 extern _IO_ssize_t _IO_file_write __P ((_IO_FILE *, const void *,
 408                                         _IO_ssize_t));
 409 extern _IO_ssize_t _IO_file_read __P ((_IO_FILE *, void *, _IO_ssize_t));
 410 extern int _IO_file_sync __P ((_IO_FILE *));
 411 extern int _IO_file_close_it __P ((_IO_FILE *));
 412 extern void _IO_file_finish __P ((_IO_FILE *, int));
 413
 414 /* Jumptable functions for proc_files. */
 415 extern _IO_FILE* _IO_proc_open __P ((_IO_FILE *, const char *, const char *));
 416 extern int _IO_proc_close __P ((_IO_FILE *));
 417
 418 /* Jumptable functions for strfiles. */
 419 extern int _IO_str_underflow __P ((_IO_FILE *));
 420 extern int _IO_str_overflow __P ((_IO_FILE *, int));
 421 extern int _IO_str_pbackfail __P ((_IO_FILE *, int));
 422 #if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 423 extern _IO_fpos64_t _IO_str_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
 424 #else
 425 extern _IO_fpos_t _IO_str_seekoff __P ((_IO_FILE *, _IO_off_t, int, int));
 426 #endif
 427 extern void _IO_str_finish __P ((_IO_FILE *, int));
 428
 429 /* Other strfile functions */
 430 extern void _IO_str_init_static __P ((_IO_FILE *, char *, int, char *));
 431 extern void _IO_str_init_readonly __P ((_IO_FILE *, const char *, int));
 432 extern _IO_ssize_t _IO_str_count __P ((_IO_FILE *));
 433
 434 extern int _IO_vasprintf __P ((char **result_ptr, __const char *format,
 435                                _IO_va_list args));
 436 extern int _IO_vdprintf __P ((int d, __const char *format, _IO_va_list arg));
 437 extern int _IO_vsnprintf __P ((char *string, _IO_size_t maxlen,
 438                                __const char *format, _IO_va_list args));
 439
 440
 441 extern _IO_size_t _IO_getline __P ((_IO_FILE *,char *, _IO_size_t, int, int));
 442 extern _IO_size_t _IO_getline_info __P ((_IO_FILE *,char *, _IO_size_t,
 443                                          int, int, int *));
 444 extern _IO_ssize_t _IO_getdelim __P ((char **, _IO_size_t *, int, _IO_FILE *));
 445 extern double _IO_strtod __P ((const char *, char **));
 446 extern char *_IO_dtoa __P ((double __d, int __mode, int __ndigits,
 447                             int *__decpt, int *__sign, char **__rve));
 448 extern int _IO_outfloat __P ((double __value, _IO_FILE *__sb, int __type,
 449                               int __width, int __precision, int __flags,
 450                               int __sign_mode, int __fill));
 451
 452 extern _IO_FILE *_IO_list_all;
 453 extern void (*_IO_cleanup_registration_needed) __P ((void));
 454
 455 #ifndef EOF
 456 # define EOF (-1)
 457 #endif
 458 #ifndef NULL
 459 # if defined __GNUG__ && \
 460     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
 461 #  define NULL (__null)
 462 # else
 463 #  if !defined(__cplusplus)
 464 #   define NULL ((void*)0)
 465 #  else
 466 #   define NULL (0)
 467 #  endif
 468 # endif
 469 #endif
 470
 471 #if _G_HAVE_MMAP
 472
 473 # include <unistd.h>
 474 # include <fcntl.h>
 475 # include <sys/mman.h>
 476 # include <sys/param.h>
 477
 478 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 479 #  define MAP_ANONYMOUS MAP_ANON
 480 # endif
 481
 482 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
 483 #  undef _G_HAVE_MMAP
 484 #  define _G_HAVE_MMAP 0
 485 # endif
 486
 487 #endif /* _G_HAVE_MMAP */
 488
 489 #if _G_HAVE_MMAP
 490
 491 # ifdef _LIBC
 492 /* When using this code in the GNU libc we must not pollute the name space.  */
 493 #  define mmap __mmap
 494 #  define munmap __munmap
 495 # endif
 496
 497 # define ROUND_TO_PAGE(_S) \
 498        (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
 499
 500 # define FREE_BUF(_B, _S) \
 501        munmap ((_B), ROUND_TO_PAGE (_S))
 502 # define ALLOC_BUF(_B, _S, _R) \
 503        do {                                                                   \
 504           (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S),                        \
 505                                 PROT_READ | PROT_WRITE,                       \
 506                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);          \
 507           if ((_B) == (char *) -1)                                            \
 508             return (_R);                                                      \
 509        } while (0)
 510
 511 #else /* _G_HAVE_MMAP */
 512
 513 # define FREE_BUF(_B, _S) \
 514        free(_B)
 515 # define ALLOC_BUF(_B, _S, _R) \
 516        do {                                                                   \
 517           (_B) = (char*)malloc(_S);                                           \
 518           if ((_B) == NULL)                                                   \
 519             return (_R);                                                      \
 520        } while (0)
 521
 522 #endif /* _G_HAVE_MMAP */
 523
 524 #ifndef OS_FSTAT
 525 # define OS_FSTAT fstat
 526 #endif
 527 struct stat;
 528 extern _IO_ssize_t _IO_read __P ((int, void *, _IO_size_t));
 529 extern _IO_ssize_t _IO_write __P ((int, const void *, _IO_size_t));
 530 extern _IO_off_t _IO_lseek __P ((int, _IO_off_t, int));
 531 extern int _IO_close __P ((int));
 532 extern int _IO_fstat __P ((int, struct stat *));
 533 extern int _IO_vscanf __P ((const char *, _IO_va_list));
 534
 535 /* Operations on _IO_fpos_t.
 536    Normally, these are trivial, but we provide hooks for configurations
 537    where an _IO_fpos_t is a struct.
 538    Note that _IO_off_t must be an integral type. */
 539
 540 /* _IO_pos_BAD is an _IO_fpos_t value indicating error, unknown, or EOF. */
 541 #ifndef _IO_pos_BAD
 542 # if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 543 #  define _IO_pos_BAD ((_IO_fpos64_t) -1)
 544 # else
 545 #  define _IO_pos_BAD ((_IO_fpos_t) -1)
 546 # endif
 547 #endif
 548 /* _IO_pos_as_off converts an _IO_fpos_t value to an _IO_off_t value. */
 549 #ifndef _IO_pos_as_off
 550 # if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 551 #  define _IO_pos_as_off(__pos) ((_IO_off64_t) (__pos))
 552 # else
 553 #  define _IO_pos_as_off(__pos) ((_IO_off_t) (__pos))
 554 # endif
 555 #endif
 556 /* _IO_pos_adjust adjust an _IO_fpos_t by some number of bytes. */
 557 #ifndef _IO_pos_adjust
 558 # define _IO_pos_adjust(__pos, __delta) ((__pos) += (__delta))
 559 #endif
 560 /* _IO_pos_0 is an _IO_fpos_t value indicating beginning of file. */
 561 #ifndef _IO_pos_0
 562 # if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
 563 #  define _IO_pos_0 ((_IO_fpos64_t) 0)
 564 # else
 565 #  define _IO_pos_0 ((_IO_fpos_t) 0)
 566 # endif
 567 #endif
 568
 569 #ifdef __cplusplus
 570 }
 571 #endif
 572
 573 #ifdef _IO_MTSAFE_IO
 574 /* check following! */
 575 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 576        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 577          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
 578            0, 0, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
 579 #else
 580 /* check following! */
 581 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 582        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 583            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD }
 584 #endif
 585
 586 /* VTABLE_LABEL defines NAME as of the CLASS class.
 587    CNLENGTH is strlen(#CLASS).  */
 588 #ifdef __GNUC__
 589 # if _G_VTABLE_LABEL_HAS_LENGTH
 590 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 591   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
 592 # else
 593 #  define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 594   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
 595 # endif
 596 #endif /* __GNUC__ */
 597
 598 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
 599 # ifdef __GNUC__
 600 VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
 601 # else
 602 #  if _G_VTABLE_LABEL_HAS_LENGTH
 603 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
 604 #  else
 605 #   define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
 606 #  endif
 607 # endif
 608 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
 609
 610 #if defined(__STDC__) || defined(__cplusplus)
 611 # define _IO_va_start(args, last) va_start(args, last)
 612 #else
 613 # define _IO_va_start(args, last) va_start(args)
 614 #endif
 615
 616 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
 617
 618 #if 1
 619 # define COERCE_FILE(FILE) /* Nothing */
 620 #else
 621 /* This is part of the kludge for binary compatibility with old stdio. */
 622 # define COERCE_FILE(FILE) \
 623   (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
 624     && (FILE) = *(FILE**)&((int*)fp)[1])
 625 #endif
 626
 627 #ifdef EINVAL
 628 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
 629 #else
 630 # define MAYBE_SET_EINVAL /* nothing */
 631 #endif
 632
 633 #ifdef IO_DEBUG
 634 # define CHECK_FILE(FILE, RET) \
 635         if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
 636         else { COERCE_FILE(FILE); \
 637                if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
 638           { MAYBE_SET_EINVAL; return RET; }}
 639 #else
 640 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)
 641 #endif