1 /* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU IO Library.
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.
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.
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,
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. */
28 # define __set_errno(Val) errno = (Val)
30 #if defined __GLIBC__ && __GLIBC__ >= 2
31 # include <bits/libc-lock.h>
33 /*# include <comthread.h>*/
42 #define _IO_seek_set 0
43 #define _IO_seek_cur 1
44 #define _IO_seek_end 2
46 /* THE JUMPTABLE FUNCTIONS.
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.
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).
67 #define _IO_JUMPS(THIS) ((struct _IO_FILE_plus *) (THIS))->vtable
68 #ifdef _G_USING_THUNKS
69 # define JUMP_FIELD(TYPE, NAME) TYPE NAME
70 # define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC (THIS)
71 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC (THIS, X1)
72 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC (THIS, X1, X2)
73 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC (THIS, X1,X2, X3)
74 # define JUMP_INIT(NAME, VALUE) VALUE
75 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0)
77 /* These macros will change when we re-implement vtables to use "thunks"! */
78 # define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
79 # define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC.pfn (THIS)
80 # define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1)
81 # define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1, X2)
82 # define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC.pfn (THIS, X1,X2,X3)
83 # define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
84 # define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
87 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
88 It does not delete (free) it, but does everything else to finalize it/
89 It matches the streambuf::~streambuf virtual destructor. */
90 typedef void (*_IO_finish_t
) __P ((_IO_FILE
*, int)); /* finalize */
91 #define _IO_FINISH(FP) JUMP1 (__finish, FP, 0)
93 /* The 'overflow' hook flushes the buffer.
94 The second argument is a character, or EOF.
95 It matches the streambuf::overflow virtual function. */
96 typedef int (*_IO_overflow_t
) __P ((_IO_FILE
*, int));
97 #define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
99 /* The 'underflow' hook tries to fills the get buffer.
100 It returns the next character (as an unsigned char) or EOF. The next
101 character remains in the get buffer, and the get position is not changed.
102 It matches the streambuf::underflow virtual function. */
103 typedef int (*_IO_underflow_t
) __P ((_IO_FILE
*));
104 #define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP)
106 /* The 'uflow' hook returns the next character in the input stream
107 (cast to unsigned char), and increments the read position;
108 EOF is returned on failure.
109 It matches the streambuf::uflow virtual function, which is not in the
110 cfront implementation, but was added to C++ by the ANSI/ISO committee. */
111 #define _IO_UFLOW(FP) JUMP0 (__uflow, FP)
113 /* The 'pbackfail' hook handles backing up.
114 It matches the streambuf::pbackfail virtual function. */
115 typedef int (*_IO_pbackfail_t
) __P ((_IO_FILE
*, int));
116 #define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH)
118 /* The 'xsputn' hook writes upto N characters from buffer DATA.
119 Returns the number of character actually written.
120 It matches the streambuf::xsputn virtual function. */
121 typedef _IO_size_t (*_IO_xsputn_t
) __P ((_IO_FILE
*FP
, const void *DATA
,
123 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
125 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
126 Returns the number of character actually read.
127 It matches the streambuf::xsgetn virtual function. */
128 typedef _IO_size_t (*_IO_xsgetn_t
) __P ((_IO_FILE
*FP
, void *DATA
,
130 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
132 /* The 'seekoff' hook moves the stream position to a new position
133 relative to the start of the file (if DIR==0), the current position
134 (MODE==1), or the end of the file (MODE==2).
135 It matches the streambuf::seekoff virtual function.
136 It is also used for the ANSI fseek function. */
137 typedef _IO_fpos_t (*_IO_seekoff_t
) __P ((_IO_FILE
*FP
, _IO_off_t OFF
,
139 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
141 /* The 'seekpos' hook also moves the stream position,
142 but to an absolute position given by a fpos_t (seekpos).
143 It matches the streambuf::seekpos virtual function.
144 It is also used for the ANSI fgetpos and fsetpos functions. */
145 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
146 typedef _IO_fpos_t (*_IO_seekpos_t
) __P ((_IO_FILE
*, _IO_fpos_t
, int));
147 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS)
149 /* The 'setbuf' hook gives a buffer to the file.
150 It matches the streambuf::setbuf virtual function. */
151 typedef _IO_FILE
* (*_IO_setbuf_t
) __P ((_IO_FILE
*, char *, _IO_ssize_t
));
152 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH)
154 /* The 'sync' hook attempts to synchronize the internal data structures
155 of the file with the external state.
156 It matches the streambuf::sync virtual function. */
157 typedef int (*_IO_sync_t
) __P ((_IO_FILE
*));
158 #define _IO_SYNC(FP) JUMP0 (__sync, FP)
160 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
161 It matches the streambuf::doallocate virtual function, which is not
162 in the ANSI/ISO C++ standard, but is part traditional implementations. */
163 typedef int (*_IO_doallocate_t
) __P ((_IO_FILE
*));
164 #define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
166 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
167 sysstat) are low-level hooks specific to this implementation.
168 There is no correspondence in the ANSI/ISO C++ standard library.
169 The hooks basically correspond to the Unix system functions
170 (read, write, close, lseek, and stat) except that a _IO_FILE*
171 parameter is used instead of a integer file descriptor; the default
172 implementation used for normal files just calls those functions.
173 The advantage of overriding these functions instead of the higher-level
174 ones (underflow, overflow etc) is that you can leave all the buffering
175 higher-level functions. */
177 /* The 'sysread' hook is used to read data from the external file into
178 an existing buffer. It generalizes the Unix read(2) function.
179 It matches the streambuf::sys_read virtual function, which is
180 specific to this implementation. */
181 typedef _IO_ssize_t (*_IO_read_t
) __P ((_IO_FILE
*, void *, _IO_ssize_t
));
182 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN)
184 /* The 'syswrite' hook is used to write data from an existing buffer
185 to an external file. It generalizes the Unix write(2) function.
186 It matches the streambuf::sys_write virtual function, which is
187 specific to this implementation. */
188 typedef _IO_ssize_t (*_IO_write_t
) __P ((_IO_FILE
*,const void *,_IO_ssize_t
));
189 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
191 /* The 'sysseek' hook is used to re-position an external file.
192 It generalizes the Unix lseek(2) function.
193 It matches the streambuf::sys_seek virtual function, which is
194 specific to this implementation. */
195 typedef _IO_fpos_t (*_IO_seek_t
) __P ((_IO_FILE
*, _IO_off_t
, int));
196 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
198 /* The 'sysclose' hook is used to finalize (close, finish up) an
199 external file. It generalizes the Unix close(2) function.
200 It matches the streambuf::sys_close virtual function, which is
201 specific to this implementation. */
202 typedef int (*_IO_close_t
) __P ((_IO_FILE
*)); /* finalize */
203 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
205 /* The 'sysstat' hook is used to get information about an external file
206 into a struct stat buffer. It generalizes the Unix fstat(2) call.
207 It matches the streambuf::sys_stat virtual function, which is
208 specific to this implementation. */
209 typedef int (*_IO_stat_t
) __P ((_IO_FILE
*, void *));
210 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
213 #define _IO_CHAR_TYPE char /* unsigned char ? */
214 #define _IO_INT_TYPE int
218 JUMP_FIELD(_G_size_t
, __dummy
);
219 #ifdef _G_USING_THUNKS
220 JUMP_FIELD(_G_size_t
, __dummy2
);
222 JUMP_FIELD(_IO_finish_t
, __finish
);
223 JUMP_FIELD(_IO_overflow_t
, __overflow
);
224 JUMP_FIELD(_IO_underflow_t
, __underflow
);
225 JUMP_FIELD(_IO_underflow_t
, __uflow
);
226 JUMP_FIELD(_IO_pbackfail_t
, __pbackfail
);
228 JUMP_FIELD(_IO_xsputn_t
, __xsputn
);
229 JUMP_FIELD(_IO_xsgetn_t
, __xsgetn
);
230 JUMP_FIELD(_IO_seekoff_t
, __seekoff
);
231 JUMP_FIELD(_IO_seekpos_t
, __seekpos
);
232 JUMP_FIELD(_IO_setbuf_t
, __setbuf
);
233 JUMP_FIELD(_IO_sync_t
, __sync
);
234 JUMP_FIELD(_IO_doallocate_t
, __doallocate
);
235 JUMP_FIELD(_IO_read_t
, __read
);
236 JUMP_FIELD(_IO_write_t
, __write
);
237 JUMP_FIELD(_IO_seek_t
, __seek
);
238 JUMP_FIELD(_IO_close_t
, __close
);
239 JUMP_FIELD(_IO_stat_t
, __stat
);
246 /* We always allocate an extra word following an _IO_FILE.
247 This contains a pointer to the function jump table used.
248 This is for compatibility with C++ streambuf; the word can
249 be used to smash to a pointer to a virtual function table. */
254 const struct _IO_jump_t
*vtable
;
257 /* Generic functions */
259 extern _IO_fpos_t _IO_seekoff
__P ((_IO_FILE
*, _IO_off_t
, int, int));
260 extern _IO_fpos_t _IO_seekpos
__P ((_IO_FILE
*, _IO_fpos_t
, int));
262 extern void _IO_switch_to_main_get_area
__P ((_IO_FILE
*));
263 extern void _IO_switch_to_backup_area
__P ((_IO_FILE
*));
264 extern int _IO_switch_to_get_mode
__P ((_IO_FILE
*));
265 extern void _IO_init
__P ((_IO_FILE
*, int));
266 extern int _IO_sputbackc
__P ((_IO_FILE
*, int));
267 extern int _IO_sungetc
__P ((_IO_FILE
*));
268 extern void _IO_un_link
__P ((_IO_FILE
*));
269 extern void _IO_link_in
__P ((_IO_FILE
*));
270 extern void _IO_doallocbuf
__P ((_IO_FILE
*));
271 extern void _IO_unsave_markers
__P ((_IO_FILE
*));
272 extern void _IO_setb
__P ((_IO_FILE
*, char *, char *, int));
273 extern unsigned _IO_adjust_column
__P ((unsigned, const char *, int));
274 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
276 /* Marker-related function. */
278 extern void _IO_init_marker
__P ((struct _IO_marker
*, _IO_FILE
*));
279 extern void _IO_remove_marker
__P ((struct _IO_marker
*));
280 extern int _IO_marker_difference
__P ((struct _IO_marker
*,
281 struct _IO_marker
*));
282 extern int _IO_marker_delta
__P ((struct _IO_marker
*));
283 extern int _IO_seekmark
__P ((_IO_FILE
*, struct _IO_marker
*, int));
285 /* Default jumptable functions. */
287 extern int _IO_default_underflow
__P ((_IO_FILE
*));
288 extern int _IO_default_uflow
__P ((_IO_FILE
*));
289 extern int _IO_default_doallocate
__P ((_IO_FILE
*));
290 extern void _IO_default_finish
__P ((_IO_FILE
*, int));
291 extern int _IO_default_pbackfail
__P ((_IO_FILE
*, int));
292 extern _IO_FILE
* _IO_default_setbuf
__P ((_IO_FILE
*, char *, _IO_ssize_t
));
293 extern _IO_size_t _IO_default_xsputn
__P ((_IO_FILE
*, const void *,
295 extern _IO_size_t _IO_default_xsgetn
__P ((_IO_FILE
*, void *, _IO_size_t
));
296 extern _IO_fpos_t _IO_default_seekoff
__P ((_IO_FILE
*, _IO_off_t
, int, int));
297 extern _IO_fpos_t _IO_default_seekpos
__P ((_IO_FILE
*, _IO_fpos_t
, int));
298 extern _IO_ssize_t _IO_default_write
__P ((_IO_FILE
*, const void *,
300 extern _IO_ssize_t _IO_default_read
__P ((_IO_FILE
*, void *, _IO_ssize_t
));
301 extern int _IO_default_stat
__P ((_IO_FILE
*, void *));
302 extern _IO_fpos_t _IO_default_seek
__P ((_IO_FILE
*, _IO_off_t
, int));
303 extern int _IO_default_sync
__P ((_IO_FILE
*));
304 #define _IO_default_close ((_IO_close_t) _IO_default_sync)
306 extern struct _IO_jump_t _IO_file_jumps
;
307 extern struct _IO_jump_t _IO_streambuf_jumps
;
308 extern struct _IO_jump_t _IO_proc_jumps
;
309 extern struct _IO_jump_t _IO_str_jumps
;
310 extern int _IO_do_write
__P ((_IO_FILE
*, const char *, _IO_size_t
));
311 extern int _IO_flush_all
__P ((void));
312 extern void _IO_cleanup
__P ((void));
313 extern void _IO_flush_all_linebuffered
__P ((void));
315 #define _IO_do_flush(_f) \
316 _IO_do_write(_f, (_f)->_IO_write_base, \
317 (_f)->_IO_write_ptr-(_f)->_IO_write_base)
318 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
319 #define _IO_mask_flags(fp, f, mask) \
320 ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
321 #define _IO_setg(fp, eb, g, eg) ((fp)->_IO_read_base = (eb),\
322 (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
323 #define _IO_setp(__fp, __p, __ep) \
324 ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
325 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
326 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
327 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
328 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
330 /* Jumptable functions for files. */
332 extern int _IO_file_doallocate
__P ((_IO_FILE
*));
333 extern _IO_FILE
* _IO_file_setbuf
__P ((_IO_FILE
*, char *, _IO_ssize_t
));
334 extern _IO_fpos_t _IO_file_seekoff
__P ((_IO_FILE
*, _IO_off_t
, int, int));
335 extern _IO_size_t _IO_file_xsputn
__P ((_IO_FILE
*, const void *, _IO_size_t
));
336 extern int _IO_file_stat
__P ((_IO_FILE
*, void *));
337 extern int _IO_file_close
__P ((_IO_FILE
*));
338 extern int _IO_file_underflow
__P ((_IO_FILE
*));
339 extern int _IO_file_overflow
__P ((_IO_FILE
*, int));
340 #define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
341 extern void _IO_file_init
__P ((_IO_FILE
*));
342 extern _IO_FILE
* _IO_file_attach
__P ((_IO_FILE
*, int));
343 extern _IO_FILE
* _IO_file_fopen
__P ((_IO_FILE
*, const char *, const char *));
344 extern _IO_ssize_t _IO_file_write
__P ((_IO_FILE
*, const void *,
346 extern _IO_ssize_t _IO_file_read
__P ((_IO_FILE
*, void *, _IO_ssize_t
));
347 extern int _IO_file_sync
__P ((_IO_FILE
*));
348 extern int _IO_file_close_it
__P ((_IO_FILE
*));
349 extern _IO_fpos_t _IO_file_seek
__P ((_IO_FILE
*, _IO_off_t
, int));
350 extern void _IO_file_finish
__P ((_IO_FILE
*, int));
352 /* Jumptable functions for proc_files. */
353 extern _IO_FILE
* _IO_proc_open
__P ((_IO_FILE
*, const char *, const char *));
354 extern int _IO_proc_close
__P ((_IO_FILE
*));
356 /* Jumptable functions for strfiles. */
357 extern int _IO_str_underflow
__P ((_IO_FILE
*));
358 extern int _IO_str_overflow
__P ((_IO_FILE
*, int));
359 extern int _IO_str_pbackfail
__P ((_IO_FILE
*, int));
360 extern _IO_fpos_t _IO_str_seekoff
__P ((_IO_FILE
*, _IO_off_t
, int, int));
361 extern void _IO_str_finish
__P ((_IO_FILE
*, int));
363 /* Other strfile functions */
364 extern void _IO_str_init_static
__P ((_IO_FILE
*, char *, int, char *));
365 extern void _IO_str_init_readonly
__P ((_IO_FILE
*, const char *, int));
366 extern _IO_ssize_t _IO_str_count
__P ((_IO_FILE
*));
368 extern int _IO_vasprintf
__P ((char **result_ptr
, __const
char *format
,
370 extern int _IO_vdprintf
__P ((int d
, __const
char *format
, _IO_va_list arg
));
371 extern int _IO_vsnprintf
__P ((char *string
, _IO_size_t maxlen
,
372 __const
char *format
, _IO_va_list args
));
375 extern _IO_size_t _IO_getline
__P ((_IO_FILE
*,char *, _IO_size_t
, int, int));
376 extern _IO_ssize_t _IO_getdelim
__P ((char **, _IO_size_t
*, int, _IO_FILE
*));
377 extern double _IO_strtod
__P ((const char *, char **));
378 extern char *_IO_dtoa
__P ((double __d
, int __mode
, int __ndigits
,
379 int *__decpt
, int *__sign
, char **__rve
));
380 extern int _IO_outfloat
__P ((double __value
, _IO_FILE
*__sb
, int __type
,
381 int __width
, int __precision
, int __flags
,
382 int __sign_mode
, int __fill
));
384 extern _IO_FILE
*_IO_list_all
;
385 extern void (*_IO_cleanup_registration_needed
) __P ((void));
391 # if defined __GNUG__ && \
392 (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
393 # define NULL (__null)
395 # if !defined(__cplusplus)
396 # define NULL ((void*)0)
407 # include <sys/mman.h>
408 # include <sys/param.h>
410 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
411 # define MAP_ANONYMOUS MAP_ANON
414 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
416 # define _G_HAVE_MMAP 0
419 #endif /* _G_HAVE_MMAP */
424 /* When using this code in the GNU libc we must not pollute the name space. */
426 # define munmap __munmap
429 # define ROUND_TO_PAGE(_S) \
430 (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
432 # define FREE_BUF(_B, _S) \
433 munmap ((_B), ROUND_TO_PAGE (_S))
434 # define ALLOC_BUF(_B, _S, _R) \
436 (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S), \
437 PROT_READ | PROT_WRITE, \
438 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); \
439 if ((_B) == (char *) -1) \
443 #else /* _G_HAVE_MMAP */
445 # define FREE_BUF(_B, _S) \
447 # define ALLOC_BUF(_B, _S, _R) \
449 (_B) = (char*)malloc(_S); \
454 #endif /* _G_HAVE_MMAP */
457 # define OS_FSTAT fstat
460 extern _IO_ssize_t _IO_read
__P ((int, void *, _IO_size_t
));
461 extern _IO_ssize_t _IO_write
__P ((int, const void *, _IO_size_t
));
462 extern _IO_off_t _IO_lseek
__P ((int, _IO_off_t
, int));
463 extern int _IO_close
__P ((int));
464 extern int _IO_fstat
__P ((int, struct stat
*));
465 extern int _IO_vscanf
__P ((const char *, _IO_va_list
));
467 /* Operations on _IO_fpos_t.
468 Normally, these are trivial, but we provide hooks for configurations
469 where an _IO_fpos_t is a struct.
470 Note that _IO_off_t must be an integral type. */
472 /* _IO_pos_BAD is an _IO_fpos_t value indicating error, unknown, or EOF. */
474 # define _IO_pos_BAD ((_IO_fpos_t) -1)
476 /* _IO_pos_as_off converts an _IO_fpos_t value to an _IO_off_t value. */
477 #ifndef _IO_pos_as_off
478 # define _IO_pos_as_off(__pos) ((_IO_off_t) (__pos))
480 /* _IO_pos_adjust adjust an _IO_fpos_t by some number of bytes. */
481 #ifndef _IO_pos_adjust
482 # define _IO_pos_adjust(__pos, __delta) ((__pos) += (__delta))
484 /* _IO_pos_0 is an _IO_fpos_t value indicating beginning of file. */
486 # define _IO_pos_0 ((_IO_fpos_t) 0)
494 /* check following! */
495 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
496 { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
497 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
498 0, 0, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
500 /* check following! */
501 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
502 { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
503 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD }
506 /* VTABLE_LABEL defines NAME as of the CLASS class.
507 CNLENGTH is strlen(#CLASS). */
509 # if _G_VTABLE_LABEL_HAS_LENGTH
510 # define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
511 extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
513 # define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
514 extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
516 #endif /* __GNUC__ */
518 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
520 VTABLE_LABEL(builtinbuf_vtable
, builtinbuf
, 10)
522 # if _G_VTABLE_LABEL_HAS_LENGTH
523 # define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
525 # define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
528 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
530 #if defined(__STDC__) || defined(__cplusplus)
531 # define _IO_va_start(args, last) va_start(args, last)
533 # define _IO_va_start(args, last) va_start(args)
536 extern struct _IO_fake_stdiobuf _IO_stdin_buf
, _IO_stdout_buf
, _IO_stderr_buf
;
539 # define COERCE_FILE(FILE) /* Nothing */
541 /* This is part of the kludge for binary compatibility with old stdio. */
542 # define COERCE_FILE(FILE) \
543 (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
544 && (FILE) = *(FILE**)&((int*)fp)[1])
548 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
550 # define MAYBE_SET_EINVAL /* nothing */
554 # define CHECK_FILE(FILE, RET) \
555 if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
556 else { COERCE_FILE(FILE); \
557 if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
558 { MAYBE_SET_EINVAL; return RET; }}
560 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)