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 # if __GLIBC_MINOR__ > 0
32 # include <bits/libc-lock.h>
34 # include <libc-lock.h>
37 /*# include <comthread.h>*/
46 #define _IO_seek_set 0
47 #define _IO_seek_cur 1
48 #define _IO_seek_end 2
50 /* THE JUMPTABLE FUNCTIONS.
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.
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).
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)
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)
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)
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)
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)
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)
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)
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
,
127 #define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N)
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
,
134 #define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N)
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 typedef _IO_fpos_t (*_IO_seekoff_t
) __P ((_IO_FILE
*FP
, _IO_off_t OFF
,
143 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE)
145 /* The 'seekpos' hook also moves the stream position,
146 but to an absolute position given by a fpos_t (seekpos).
147 It matches the streambuf::seekpos virtual function.
148 It is also used for the ANSI fgetpos and fsetpos functions. */
149 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
150 typedef _IO_fpos_t (*_IO_seekpos_t
) __P ((_IO_FILE
*, _IO_fpos_t
, int));
151 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS)
153 /* The 'setbuf' hook gives a buffer to the file.
154 It matches the streambuf::setbuf virtual function. */
155 typedef _IO_FILE
* (*_IO_setbuf_t
) __P ((_IO_FILE
*, char *, _IO_ssize_t
));
156 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH)
158 /* The 'sync' hook attempts to synchronize the internal data structures
159 of the file with the external state.
160 It matches the streambuf::sync virtual function. */
161 typedef int (*_IO_sync_t
) __P ((_IO_FILE
*));
162 #define _IO_SYNC(FP) JUMP0 (__sync, FP)
164 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
165 It matches the streambuf::doallocate virtual function, which is not
166 in the ANSI/ISO C++ standard, but is part traditional implementations. */
167 typedef int (*_IO_doallocate_t
) __P ((_IO_FILE
*));
168 #define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP)
170 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
171 sysstat) are low-level hooks specific to this implementation.
172 There is no correspondence in the ANSI/ISO C++ standard library.
173 The hooks basically correspond to the Unix system functions
174 (read, write, close, lseek, and stat) except that a _IO_FILE*
175 parameter is used instead of a integer file descriptor; the default
176 implementation used for normal files just calls those functions.
177 The advantage of overriding these functions instead of the higher-level
178 ones (underflow, overflow etc) is that you can leave all the buffering
179 higher-level functions. */
181 /* The 'sysread' hook is used to read data from the external file into
182 an existing buffer. It generalizes the Unix read(2) function.
183 It matches the streambuf::sys_read virtual function, which is
184 specific to this implementation. */
185 typedef _IO_ssize_t (*_IO_read_t
) __P ((_IO_FILE
*, void *, _IO_ssize_t
));
186 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN)
188 /* The 'syswrite' hook is used to write data from an existing buffer
189 to an external file. It generalizes the Unix write(2) function.
190 It matches the streambuf::sys_write virtual function, which is
191 specific to this implementation. */
192 typedef _IO_ssize_t (*_IO_write_t
) __P ((_IO_FILE
*,const void *,_IO_ssize_t
));
193 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN)
195 /* The 'sysseek' hook is used to re-position an external file.
196 It generalizes the Unix lseek(2) function.
197 It matches the streambuf::sys_seek virtual function, which is
198 specific to this implementation. */
199 typedef _IO_fpos_t (*_IO_seek_t
) __P ((_IO_FILE
*, _IO_off_t
, int));
200 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE)
202 /* The 'sysclose' hook is used to finalize (close, finish up) an
203 external file. It generalizes the Unix close(2) function.
204 It matches the streambuf::sys_close virtual function, which is
205 specific to this implementation. */
206 typedef int (*_IO_close_t
) __P ((_IO_FILE
*)); /* finalize */
207 #define _IO_SYSCLOSE(FP) JUMP0 (__close, FP)
209 /* The 'sysstat' hook is used to get information about an external file
210 into a struct stat buffer. It generalizes the Unix fstat(2) call.
211 It matches the streambuf::sys_stat virtual function, which is
212 specific to this implementation. */
213 typedef int (*_IO_stat_t
) __P ((_IO_FILE
*, void *));
214 #define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF)
217 #define _IO_CHAR_TYPE char /* unsigned char ? */
218 #define _IO_INT_TYPE int
222 JUMP_FIELD(_G_size_t
, __dummy
);
223 #ifdef _G_USING_THUNKS
224 JUMP_FIELD(_G_size_t
, __dummy2
);
226 JUMP_FIELD(_IO_finish_t
, __finish
);
227 JUMP_FIELD(_IO_overflow_t
, __overflow
);
228 JUMP_FIELD(_IO_underflow_t
, __underflow
);
229 JUMP_FIELD(_IO_underflow_t
, __uflow
);
230 JUMP_FIELD(_IO_pbackfail_t
, __pbackfail
);
232 JUMP_FIELD(_IO_xsputn_t
, __xsputn
);
233 JUMP_FIELD(_IO_xsgetn_t
, __xsgetn
);
234 JUMP_FIELD(_IO_seekoff_t
, __seekoff
);
235 JUMP_FIELD(_IO_seekpos_t
, __seekpos
);
236 JUMP_FIELD(_IO_setbuf_t
, __setbuf
);
237 JUMP_FIELD(_IO_sync_t
, __sync
);
238 JUMP_FIELD(_IO_doallocate_t
, __doallocate
);
239 JUMP_FIELD(_IO_read_t
, __read
);
240 JUMP_FIELD(_IO_write_t
, __write
);
241 JUMP_FIELD(_IO_seek_t
, __seek
);
242 JUMP_FIELD(_IO_close_t
, __close
);
243 JUMP_FIELD(_IO_stat_t
, __stat
);
250 /* We always allocate an extra word following an _IO_FILE.
251 This contains a pointer to the function jump table used.
252 This is for compatibility with C++ streambuf; the word can
253 be used to smash to a pointer to a virtual function table. */
258 const struct _IO_jump_t
*vtable
;
261 /* Generic functions */
263 extern _IO_fpos_t _IO_seekoff
__P ((_IO_FILE
*, _IO_off_t
, int, int));
264 extern _IO_fpos_t _IO_seekpos
__P ((_IO_FILE
*, _IO_fpos_t
, int));
266 extern void _IO_switch_to_main_get_area
__P ((_IO_FILE
*));
267 extern void _IO_switch_to_backup_area
__P ((_IO_FILE
*));
268 extern int _IO_switch_to_get_mode
__P ((_IO_FILE
*));
269 extern void _IO_init
__P ((_IO_FILE
*, int));
270 extern int _IO_sputbackc
__P ((_IO_FILE
*, int));
271 extern int _IO_sungetc
__P ((_IO_FILE
*));
272 extern void _IO_un_link
__P ((_IO_FILE
*));
273 extern void _IO_link_in
__P ((_IO_FILE
*));
274 extern void _IO_doallocbuf
__P ((_IO_FILE
*));
275 extern void _IO_unsave_markers
__P ((_IO_FILE
*));
276 extern void _IO_setb
__P ((_IO_FILE
*, char *, char *, int));
277 extern unsigned _IO_adjust_column
__P ((unsigned, const char *, int));
278 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n)
280 /* Marker-related function. */
282 extern void _IO_init_marker
__P ((struct _IO_marker
*, _IO_FILE
*));
283 extern void _IO_remove_marker
__P ((struct _IO_marker
*));
284 extern int _IO_marker_difference
__P ((struct _IO_marker
*,
285 struct _IO_marker
*));
286 extern int _IO_marker_delta
__P ((struct _IO_marker
*));
287 extern int _IO_seekmark
__P ((_IO_FILE
*, struct _IO_marker
*, int));
289 /* Default jumptable functions. */
291 extern int _IO_default_underflow
__P ((_IO_FILE
*));
292 extern int _IO_default_uflow
__P ((_IO_FILE
*));
293 extern int _IO_default_doallocate
__P ((_IO_FILE
*));
294 extern void _IO_default_finish
__P ((_IO_FILE
*, int));
295 extern int _IO_default_pbackfail
__P ((_IO_FILE
*, int));
296 extern _IO_FILE
* _IO_default_setbuf
__P ((_IO_FILE
*, char *, _IO_ssize_t
));
297 extern _IO_size_t _IO_default_xsputn
__P ((_IO_FILE
*, const void *,
299 extern _IO_size_t _IO_default_xsgetn
__P ((_IO_FILE
*, void *, _IO_size_t
));
300 extern _IO_fpos_t _IO_default_seekoff
__P ((_IO_FILE
*, _IO_off_t
, int, int));
301 extern _IO_fpos_t _IO_default_seekpos
__P ((_IO_FILE
*, _IO_fpos_t
, int));
302 extern _IO_ssize_t _IO_default_write
__P ((_IO_FILE
*, const void *,
304 extern _IO_ssize_t _IO_default_read
__P ((_IO_FILE
*, void *, _IO_ssize_t
));
305 extern int _IO_default_stat
__P ((_IO_FILE
*, void *));
306 extern _IO_fpos_t _IO_default_seek
__P ((_IO_FILE
*, _IO_off_t
, int));
307 extern int _IO_default_sync
__P ((_IO_FILE
*));
308 #define _IO_default_close ((_IO_close_t) _IO_default_sync)
310 extern struct _IO_jump_t _IO_file_jumps
;
311 extern struct _IO_jump_t _IO_streambuf_jumps
;
312 extern struct _IO_jump_t _IO_proc_jumps
;
313 extern struct _IO_jump_t _IO_str_jumps
;
314 extern int _IO_do_write
__P ((_IO_FILE
*, const char *, _IO_size_t
));
315 extern int _IO_flush_all
__P ((void));
316 extern void _IO_cleanup
__P ((void));
317 extern void _IO_flush_all_linebuffered
__P ((void));
319 #define _IO_do_flush(_f) \
320 _IO_do_write(_f, (_f)->_IO_write_base, \
321 (_f)->_IO_write_ptr-(_f)->_IO_write_base)
322 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
323 #define _IO_mask_flags(fp, f, mask) \
324 ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
325 #define _IO_setg(fp, eb, g, eg) ((fp)->_IO_read_base = (eb),\
326 (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
327 #define _IO_setp(__fp, __p, __ep) \
328 ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
329 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
330 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
331 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
332 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
334 /* Jumptable functions for files. */
336 extern int _IO_file_doallocate
__P ((_IO_FILE
*));
337 extern _IO_FILE
* _IO_file_setbuf
__P ((_IO_FILE
*, char *, _IO_ssize_t
));
338 extern _IO_fpos_t _IO_file_seekoff
__P ((_IO_FILE
*, _IO_off_t
, int, int));
339 extern _IO_size_t _IO_file_xsputn
__P ((_IO_FILE
*, const void *, _IO_size_t
));
340 extern int _IO_file_stat
__P ((_IO_FILE
*, void *));
341 extern int _IO_file_close
__P ((_IO_FILE
*));
342 extern int _IO_file_underflow
__P ((_IO_FILE
*));
343 extern int _IO_file_overflow
__P ((_IO_FILE
*, int));
344 #define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
345 extern void _IO_file_init
__P ((_IO_FILE
*));
346 extern _IO_FILE
* _IO_file_attach
__P ((_IO_FILE
*, int));
347 extern _IO_FILE
* _IO_file_fopen
__P ((_IO_FILE
*, const char *, const char *));
348 extern _IO_ssize_t _IO_file_write
__P ((_IO_FILE
*, const void *,
350 extern _IO_ssize_t _IO_file_read
__P ((_IO_FILE
*, void *, _IO_ssize_t
));
351 extern int _IO_file_sync
__P ((_IO_FILE
*));
352 extern int _IO_file_close_it
__P ((_IO_FILE
*));
353 extern _IO_fpos_t _IO_file_seek
__P ((_IO_FILE
*, _IO_off_t
, int));
354 extern void _IO_file_finish
__P ((_IO_FILE
*, int));
356 /* Jumptable functions for proc_files. */
357 extern _IO_FILE
* _IO_proc_open
__P ((_IO_FILE
*, const char *, const char *));
358 extern int _IO_proc_close
__P ((_IO_FILE
*));
360 /* Jumptable functions for strfiles. */
361 extern int _IO_str_underflow
__P ((_IO_FILE
*));
362 extern int _IO_str_overflow
__P ((_IO_FILE
*, int));
363 extern int _IO_str_pbackfail
__P ((_IO_FILE
*, int));
364 extern _IO_fpos_t _IO_str_seekoff
__P ((_IO_FILE
*, _IO_off_t
, int, int));
365 extern void _IO_str_finish
__P ((_IO_FILE
*, int));
367 /* Other strfile functions */
368 extern void _IO_str_init_static
__P ((_IO_FILE
*, char *, int, char *));
369 extern void _IO_str_init_readonly
__P ((_IO_FILE
*, const char *, int));
370 extern _IO_ssize_t _IO_str_count
__P ((_IO_FILE
*));
372 extern int _IO_vasprintf
__P ((char **result_ptr
, __const
char *format
,
374 extern int _IO_vdprintf
__P ((int d
, __const
char *format
, _IO_va_list arg
));
375 extern int _IO_vsnprintf
__P ((char *string
, _IO_size_t maxlen
,
376 __const
char *format
, _IO_va_list args
));
379 extern _IO_size_t _IO_getline
__P ((_IO_FILE
*,char *, _IO_size_t
, int, int));
380 extern _IO_ssize_t _IO_getdelim
__P ((char **, _IO_size_t
*, int, _IO_FILE
*));
381 extern double _IO_strtod
__P ((const char *, char **));
382 extern char *_IO_dtoa
__P ((double __d
, int __mode
, int __ndigits
,
383 int *__decpt
, int *__sign
, char **__rve
));
384 extern int _IO_outfloat
__P ((double __value
, _IO_FILE
*__sb
, int __type
,
385 int __width
, int __precision
, int __flags
,
386 int __sign_mode
, int __fill
));
388 extern _IO_FILE
*_IO_list_all
;
389 extern void (*_IO_cleanup_registration_needed
) __P ((void));
395 # if defined __GNUG__ && \
396 (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
397 # define NULL (__null)
399 # if !defined(__cplusplus)
400 # define NULL ((void*)0)
411 # include <sys/mman.h>
412 # include <sys/param.h>
414 # if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
415 # define MAP_ANONYMOUS MAP_ANON
418 # if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
420 # define _G_HAVE_MMAP 0
423 #endif /* _G_HAVE_MMAP */
428 /* When using this code in the GNU libc we must not pollute the name space. */
430 # define munmap __munmap
433 # define ROUND_TO_PAGE(_S) \
434 (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
436 # define FREE_BUF(_B, _S) \
437 munmap ((_B), ROUND_TO_PAGE (_S))
438 # define ALLOC_BUF(_B, _S, _R) \
440 (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S), \
441 PROT_READ | PROT_WRITE, \
442 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); \
443 if ((_B) == (char *) -1) \
447 #else /* _G_HAVE_MMAP */
449 # define FREE_BUF(_B, _S) \
451 # define ALLOC_BUF(_B, _S, _R) \
453 (_B) = (char*)malloc(_S); \
458 #endif /* _G_HAVE_MMAP */
461 # define OS_FSTAT fstat
464 extern _IO_ssize_t _IO_read
__P ((int, void *, _IO_size_t
));
465 extern _IO_ssize_t _IO_write
__P ((int, const void *, _IO_size_t
));
466 extern _IO_off_t _IO_lseek
__P ((int, _IO_off_t
, int));
467 extern int _IO_close
__P ((int));
468 extern int _IO_fstat
__P ((int, struct stat
*));
469 extern int _IO_vscanf
__P ((const char *, _IO_va_list
));
471 /* Operations on _IO_fpos_t.
472 Normally, these are trivial, but we provide hooks for configurations
473 where an _IO_fpos_t is a struct.
474 Note that _IO_off_t must be an integral type. */
476 /* _IO_pos_BAD is an _IO_fpos_t value indicating error, unknown, or EOF. */
478 # define _IO_pos_BAD ((_IO_fpos_t) -1)
480 /* _IO_pos_as_off converts an _IO_fpos_t value to an _IO_off_t value. */
481 #ifndef _IO_pos_as_off
482 # define _IO_pos_as_off(__pos) ((_IO_off_t) (__pos))
484 /* _IO_pos_adjust adjust an _IO_fpos_t by some number of bytes. */
485 #ifndef _IO_pos_adjust
486 # define _IO_pos_adjust(__pos, __delta) ((__pos) += (__delta))
488 /* _IO_pos_0 is an _IO_fpos_t value indicating beginning of file. */
490 # define _IO_pos_0 ((_IO_fpos_t) 0)
498 /* check following! */
499 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
500 { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
501 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
502 0, 0, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
504 /* check following! */
505 # define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
506 { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
507 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD }
510 /* VTABLE_LABEL defines NAME as of the CLASS class.
511 CNLENGTH is strlen(#CLASS). */
513 # if _G_VTABLE_LABEL_HAS_LENGTH
514 # define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
515 extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
517 # define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
518 extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
520 #endif /* __GNUC__ */
522 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
524 VTABLE_LABEL(builtinbuf_vtable
, builtinbuf
, 10)
526 # if _G_VTABLE_LABEL_HAS_LENGTH
527 # define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
529 # define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
532 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
534 #if defined(__STDC__) || defined(__cplusplus)
535 # define _IO_va_start(args, last) va_start(args, last)
537 # define _IO_va_start(args, last) va_start(args)
540 extern struct _IO_fake_stdiobuf _IO_stdin_buf
, _IO_stdout_buf
, _IO_stderr_buf
;
543 # define COERCE_FILE(FILE) /* Nothing */
545 /* This is part of the kludge for binary compatibility with old stdio. */
546 # define COERCE_FILE(FILE) \
547 (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
548 && (FILE) = *(FILE**)&((int*)fp)[1])
552 # define MAYBE_SET_EINVAL __set_errno (EINVAL)
554 # define MAYBE_SET_EINVAL /* nothing */
558 # define CHECK_FILE(FILE, RET) \
559 if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
560 else { COERCE_FILE(FILE); \
561 if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
562 { MAYBE_SET_EINVAL; return RET; }}
564 # define CHECK_FILE(FILE, RET) COERCE_FILE (FILE)