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. */
31 /* This is a GNU libc special. Simply set errno to the given value here. */
32 #define __set_errno(Val) (errno = (Val))
34 #include <stdio-lock.h>
38 #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(__cplusplus)
39 /* All known AIX compilers implement these things (but don't always
40 define __STDC__). The RISC/OS MIPS compiler defines these things
41 in SVR4 mode, but does not define __STDC__. */
44 #define DEFUN(name, arglist, args) name(args)
45 #define DEFUN_VOID(name) name(void)
47 #else /* Not ANSI C. */
50 #ifndef const /* some systems define it in header files for non-ansi mode */
53 #define DEFUN(name, arglist, args) name arglist args;
54 #define DEFUN_VOID(name) name()
61 #define _IO_seek_set 0
62 #define _IO_seek_cur 1
63 #define _IO_seek_end 2
65 /* THE JUMPTABLE FUNCTIONS.
67 * The _IO_FILE type is used to implement the FILE type in GNU libc,
68 * as well as the streambuf class in GNU iostreams for C++.
69 * These are all the same, just used differently.
70 * An _IO_FILE (or FILE) object is allows followed by a pointer to
71 * a jump table (of pointers to functions). The pointer is accessed
72 * with the _IO_JUMPS macro. The jump table has a eccentric format,
73 * so as to be compatible with the layout of a C++ virtual function table.
74 * (as implemented by g++). When a pointer to a steambuf object is
75 * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
76 * happens to point to the virtual function table of the streambuf.
77 * Thus the _IO_JUMPS function table used for C stdio/libio does
78 * double duty as the virtual functiuon table for C++ streambuf.
80 * The entries in the _IO_JUMPS function table (and hence also the
81 * virtual functions of a streambuf) are described below.
82 * The first parameter of each function entry is the _IO_FILE/streambuf
83 * object being acted on (i.e. the 'this' parameter).
86 #define _IO_JUMPS(THIS) ((struct _IO_FILE_plus*)(THIS))->vtable
87 #ifdef _G_USING_THUNKS
88 #define JUMP_FIELD(TYPE, NAME) TYPE NAME
89 #define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC(THIS)
90 #define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC(THIS, X1)
91 #define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC(THIS, X1, X2)
92 #define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC(THIS, X1,X2, X3)
93 #define JUMP_INIT(NAME, VALUE) VALUE
94 #define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT(dummy2, 0)
96 /* These macros will change when we re-implement vtables to use "thunks"! */
97 #define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
98 #define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC.pfn(THIS)
99 #define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1)
100 #define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1, X2)
101 #define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1,X2, X3)
102 #define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
103 #define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
106 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
107 It does not delete (free) it, but does everything else to finalize it/
108 It matches the streambuf::~streambuf virtual destructor. */
109 typedef void (*_IO_finish_t) __P((_IO_FILE*, int)); /* finalize */
110 #define _IO_FINISH(FP) JUMP1(__finish, FP, 0)
112 /* The 'overflow' hook flushes the buffer.
113 The second argument is a character, or EOF.
114 It matches the streambuf::overflow virtual function. */
115 typedef int (*_IO_overflow_t) __P((_IO_FILE*, int));
116 #define _IO_OVERFLOW(FP, CH) JUMP1(__overflow, FP, CH)
118 /* The 'underflow' hook tries to fills the get buffer.
119 It returns the next character (as an unsigned char) or EOF. The next
120 character remains in the get buffer, and the get postion is not changed.
121 It matches the streambuf::underflow virtual function. */
122 typedef int (*_IO_underflow_t) __P((_IO_FILE*));
123 #define _IO_UNDERFLOW(FP) JUMP0(__underflow, FP)
125 /* The 'uflow' hook returns the next character in the input stream
126 (cast to unsigned char), and increments the read position;
127 EOF is returned on failure.
128 It matches the streambuf::uflow virtual function, which is not in the
129 cfront implementation, but was added to C++ by the ANSI/ISO committee. */
130 #define _IO_UFLOW(FP) JUMP0(__uflow, FP)
132 /* The 'pbackfail' hook handles backing up.
133 It matches the streambuf::pbackfail virtual function. */
134 typedef int (*_IO_pbackfail_t) __P((_IO_FILE*, int));
135 #define _IO_PBACKFAIL(FP, CH) JUMP1(__pbackfail, FP, CH)
137 /* The 'xsputn' hook writes upto N characters from buffer DATA.
138 Returns the number of character actually written.
139 It matches the streambuf::xsputn virtual function. */
140 typedef _IO_size_t (*_IO_xsputn_t)
141 __P((_IO_FILE *FP, const void *DATA, _IO_size_t N));
142 #define _IO_XSPUTN(FP, DATA, N) JUMP2(__xsputn, FP, DATA, N)
144 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
145 Returns the number of character actually read.
146 It matches the streambuf::xsgetn virtual function. */
147 typedef _IO_size_t (*_IO_xsgetn_t) __P((_IO_FILE*FP, void*DATA, _IO_size_t N));
148 #define _IO_XSGETN(FP, DATA, N) JUMP2(__xsgetn, FP, DATA, N)
150 /* The 'seekoff' hook moves the stream position to a new position
151 relative to the start of the file (if DIR==0), the current position
152 (MODE==1), or the end of the file (MODE==2).
153 It matches the streambuf::seekoff virtual function.
154 It is also used for the ANSI fseek function. */
155 typedef _IO_fpos_t (*_IO_seekoff_t)
156 __P((_IO_FILE* FP, _IO_off_t OFF, int DIR, int MODE));
157 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3(__seekoff, FP, OFF, DIR, MODE)
159 /* The 'seekpos' hook also moves the stream position,
160 but to an absolute position given by a fpos_t (seekpos).
161 It matches the streambuf::seekpos virtual function.
162 It is also used for the ANSI fgetpos and fsetpos functions. */
163 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
164 typedef _IO_fpos_t (*_IO_seekpos_t) __P((_IO_FILE*, _IO_fpos_t, int));
165 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2(__seekpos, FP, POS, FLAGS)
167 /* The 'setbuf' hook gives a buffer to the file.
168 It matches the streambuf::setbuf virtual function. */
169 typedef _IO_FILE* (*_IO_setbuf_t) __P((_IO_FILE*, char *, _IO_ssize_t));
170 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2(__setbuf, FP, BUFFER, LENGTH)
172 /* The 'sync' hook attempts to synchronize the internal data structures
173 of the file with the external state.
174 It matches the streambuf::sync virtual function. */
175 typedef int (*_IO_sync_t) __P((_IO_FILE*));
176 #define _IO_SYNC(FP) JUMP0(__sync, FP)
178 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
179 It matches the streambuf::doallocate virtual function, which is not
180 in the ANSI/ISO C++ standard, but is part traditional implementations. */
181 typedef int (*_IO_doallocate_t) __P((_IO_FILE*));
182 #define _IO_DOALLOCATE(FP) JUMP0(__doallocate, FP)
184 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
185 sysstat) are low-level hooks specific to this implementation.
186 There is no correspondance in the ANSI/ISO C++ standard library.
187 The hooks basically correspond to the Unix system functions
188 (read, write, close, lseek, and stat) except that a _IO_FILE*
189 parameter is used instead of a integer file descriptor; the default
190 implementation used for normal files just calls those functions.
191 The advantage of overriding these functions instead of the higher-level
192 ones (underflow, overflow etc) is that you can leave all the buffering
193 higher-level functions. */
195 /* The 'sysread' hook is used to read data from the external file into
196 an existing buffer. It generalizes the Unix read(2) function.
197 It matches the streambuf::sys_read virtual function, which is
198 specific to this implementaion. */
199 typedef _IO_ssize_t (*_IO_read_t) __P((_IO_FILE*, void*, _IO_ssize_t));
200 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2(__read, FP, DATA, LEN)
202 /* The 'syswrite' hook is used to write data from an existing buffer
203 to an external file. It generalizes the Unix write(2) function.
204 It matches the streambuf::sys_write virtual function, which is
205 specific to this implementaion. */
206 typedef _IO_ssize_t (*_IO_write_t) __P((_IO_FILE*,const void*,_IO_ssize_t));
207 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2(__write, FP, DATA, LEN)
209 /* The 'sysseek' hook is used to re-position an external file.
210 It generalizes the Unix lseek(2) function.
211 It matches the streambuf::sys_seek virtual function, which is
212 specific to this implementaion. */
213 typedef _IO_fpos_t (*_IO_seek_t) __P((_IO_FILE*, _IO_off_t, int));
214 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2(__seek, FP, OFFSET, MODE)
216 /* The 'sysclose' hook is used to finalize (close, finish up) an
217 external file. It generalizes the Unix close(2) function.
218 It matches the streambuf::sys_close virtual function, which is
219 specific to this implementation. */
220 typedef int (*_IO_close_t) __P((_IO_FILE*)); /* finalize */
221 #define _IO_SYSCLOSE(FP) JUMP0(__close, FP)
223 /* The 'sysstat' hook is used to get information about an external file
224 into a struct stat buffer. It generalizes the Unix fstat(2) call.
225 It matches the streambuf::sys_stat virtual function, which is
226 specific to this implementaion. */
227 typedef int (*_IO_stat_t) __P((_IO_FILE*, void*));
228 #define _IO_SYSSTAT(FP, BUF) JUMP1(__stat, FP, BUF)
231 #define _IO_CHAR_TYPE char /* unsigned char ? */
232 #define _IO_INT_TYPE int
235 JUMP_FIELD(_G_size_t, __dummy);
236 #ifdef _G_USING_THUNKS
237 JUMP_FIELD(_G_size_t, __dummy2);
239 JUMP_FIELD(_IO_finish_t, __finish);
240 JUMP_FIELD(_IO_overflow_t, __overflow);
241 JUMP_FIELD(_IO_underflow_t, __underflow);
242 JUMP_FIELD(_IO_underflow_t, __uflow);
243 JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
245 JUMP_FIELD(_IO_xsputn_t, __xsputn);
246 JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
247 JUMP_FIELD(_IO_seekoff_t, __seekoff);
248 JUMP_FIELD(_IO_seekpos_t, __seekpos);
249 JUMP_FIELD(_IO_setbuf_t, __setbuf);
250 JUMP_FIELD(_IO_sync_t, __sync);
251 JUMP_FIELD(_IO_doallocate_t, __doallocate);
252 JUMP_FIELD(_IO_read_t, __read);
253 JUMP_FIELD(_IO_write_t, __write);
254 JUMP_FIELD(_IO_seek_t, __seek);
255 JUMP_FIELD(_IO_close_t, __close);
256 JUMP_FIELD(_IO_stat_t, __stat);
263 /* We always allocate an extra word following an _IO_FILE.
264 This contains a pointer to the function jump table used.
265 This is for compatibility with C++ streambuf; the word can
266 be used to smash to a pointer to a virtual function table. */
268 struct _IO_FILE_plus {
270 const struct _IO_jump_t *vtable;
273 /* Generic functions */
275 extern _IO_fpos_t _IO_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
276 extern _IO_fpos_t _IO_seekpos __P((_IO_FILE*, _IO_fpos_t, int));
278 extern int _IO_switch_to_get_mode __P((_IO_FILE*));
279 extern void _IO_init __P((_IO_FILE*, int));
280 extern int _IO_sputbackc __P((_IO_FILE*, int));
281 extern int _IO_sungetc __P((_IO_FILE*));
282 extern void _IO_un_link __P((_IO_FILE*));
283 extern void _IO_link_in __P((_IO_FILE *));
284 extern void _IO_doallocbuf __P((_IO_FILE*));
285 extern void _IO_unsave_markers __P((_IO_FILE*));
286 extern void _IO_setb __P((_IO_FILE*, char*, char*, int));
287 extern unsigned _IO_adjust_column __P((unsigned, const char *, int));
288 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN(__fp, __s, __n)
290 /* Marker-related function. */
292 extern void _IO_init_marker __P((struct _IO_marker *, _IO_FILE *));
293 extern void _IO_remove_marker __P((struct _IO_marker*));
294 extern int _IO_marker_difference __P((struct _IO_marker *, struct _IO_marker *));
295 extern int _IO_marker_delta __P((struct _IO_marker *));
296 extern int _IO_seekmark __P((_IO_FILE *, struct _IO_marker *, int));
298 /* Default jumptable functions. */
300 extern int _IO_default_underflow __P((_IO_FILE*));
301 extern int _IO_default_uflow __P((_IO_FILE*));
302 extern int _IO_default_doallocate __P((_IO_FILE*));
303 extern void _IO_default_finish __P((_IO_FILE *, int));
304 extern int _IO_default_pbackfail __P((_IO_FILE*, int));
305 extern _IO_FILE* _IO_default_setbuf __P((_IO_FILE *, char*, _IO_ssize_t));
306 extern _IO_size_t _IO_default_xsputn __P((_IO_FILE *, const void*, _IO_size_t));
307 extern _IO_size_t _IO_default_xsgetn __P((_IO_FILE *, void*, _IO_size_t));
308 extern _IO_fpos_t _IO_default_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
309 extern _IO_fpos_t _IO_default_seekpos __P((_IO_FILE*, _IO_fpos_t, int));
310 extern _IO_ssize_t _IO_default_write __P((_IO_FILE*,const void*,_IO_ssize_t));
311 extern _IO_ssize_t _IO_default_read __P((_IO_FILE*, void*, _IO_ssize_t));
312 extern int _IO_default_stat __P((_IO_FILE*, void*));
313 extern _IO_fpos_t _IO_default_seek __P((_IO_FILE*, _IO_off_t, int));
314 extern int _IO_default_sync __P((_IO_FILE*));
315 #define _IO_default_close ((_IO_close_t)_IO_default_sync)
317 extern struct _IO_jump_t _IO_file_jumps;
318 extern struct _IO_jump_t _IO_streambuf_jumps;
319 extern struct _IO_jump_t _IO_proc_jumps;
320 extern struct _IO_jump_t _IO_str_jumps;
321 extern int _IO_do_write __P((_IO_FILE*, const char*, _IO_size_t));
322 extern int _IO_flush_all __P((void));
323 extern void _IO_cleanup __P((void));
324 extern void _IO_flush_all_linebuffered __P((void));
326 #define _IO_do_flush(_f) \
327 _IO_do_write(_f, (_f)->_IO_write_base, \
328 (_f)->_IO_write_ptr-(_f)->_IO_write_base)
329 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
330 #define _IO_mask_flags(fp, f, mask) \
331 ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
332 #define _IO_setg(fp, eb, g, eg) ((fp)->_IO_read_base = (eb),\
333 (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
334 #define _IO_setp(__fp, __p, __ep) \
335 ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
336 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
337 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
338 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
339 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
341 /* Jumptable functions for files. */
343 extern int _IO_file_doallocate __P((_IO_FILE*));
344 extern _IO_FILE* _IO_file_setbuf __P((_IO_FILE *, char*, _IO_ssize_t));
345 extern _IO_fpos_t _IO_file_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
346 extern _IO_size_t _IO_file_xsputn __P((_IO_FILE*,const void*,_IO_size_t));
347 extern int _IO_file_stat __P((_IO_FILE*, void*));
348 extern int _IO_file_close __P((_IO_FILE*));
349 extern int _IO_file_underflow __P((_IO_FILE *));
350 extern int _IO_file_overflow __P((_IO_FILE *, int));
351 #define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
352 extern void _IO_file_init __P((_IO_FILE*));
353 extern _IO_FILE* _IO_file_fopen __P((_IO_FILE*, const char*, const char*));
354 extern _IO_ssize_t _IO_file_write __P((_IO_FILE*,const void*,_IO_ssize_t));
355 extern _IO_ssize_t _IO_file_read __P((_IO_FILE*, void*, _IO_ssize_t));
356 extern int _IO_file_sync __P((_IO_FILE*));
357 extern int _IO_file_close_it __P((_IO_FILE*));
358 extern _IO_fpos_t _IO_file_seek __P((_IO_FILE *, _IO_off_t, int));
359 extern void _IO_file_finish __P((_IO_FILE*, int));
361 /* Other file functions. */
362 extern _IO_FILE* _IO_file_attach __P((_IO_FILE *, int));
364 /* Jumptable functions for proc_files. */
365 extern _IO_FILE* _IO_proc_open __P((_IO_FILE*, const char*, const char *));
366 extern int _IO_proc_close __P((_IO_FILE*));
368 /* Jumptable functions for strfiles. */
369 extern int _IO_str_underflow __P((_IO_FILE*));
370 extern int _IO_str_overflow __P((_IO_FILE *, int));
371 extern int _IO_str_pbackfail __P((_IO_FILE*, int));
372 extern _IO_fpos_t _IO_str_seekoff __P((_IO_FILE*,_IO_off_t,int,int));
373 extern void _IO_str_finish __P ((_IO_FILE*, int));
375 /* Other strfile functions */
376 extern void _IO_str_init_static __P((_IO_FILE *, char*, int, char*));
377 extern void _IO_str_init_readonly __P((_IO_FILE *, const char*, int));
378 extern _IO_ssize_t _IO_str_count __P ((_IO_FILE*));
380 extern int _IO_vasprintf __P ((char **result_ptr, __const char *format,
382 extern int _IO_vdprintf __P ((int d, __const char *format, _IO_va_list arg));
383 extern int _IO_vsnprintf __P ((char *string, _IO_size_t maxlen,
384 __const char *format, _IO_va_list args));
387 extern _IO_size_t _IO_getline __P((_IO_FILE*,char*,_IO_size_t,int,int));
388 extern _IO_ssize_t _IO_getdelim __P((char**, _IO_size_t*, int, _IO_FILE*));
389 extern double _IO_strtod __P((const char *, char **));
390 extern char * _IO_dtoa __P((double __d, int __mode, int __ndigits,
391 int *__decpt, int *__sign, char **__rve));
392 extern int _IO_outfloat __P((double __value, _IO_FILE *__sb, int __type,
393 int __width, int __precision, int __flags,
394 int __sign_mode, int __fill));
396 extern _IO_FILE *_IO_list_all;
397 extern void (*_IO_cleanup_registration_needed) __P ((void));
404 #define NULL (__null)
406 #if !defined(__cplusplus)
407 #define NULL ((void*)0)
418 #include <sys/mman.h>
419 #include <sys/param.h>
421 #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
422 #define MAP_ANONYMOUS MAP_ANON
425 #if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
427 #define _G_HAVE_MMAP 0
430 #endif /* _G_HAVE_MMAP */
434 #define ROUND_TO_PAGE(_S) \
435 (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
437 #define FREE_BUF(_B, _S) \
438 munmap ((_B), ROUND_TO_PAGE (_S))
439 #define ALLOC_BUF(_B, _S, _R) \
441 (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S), \
442 PROT_READ | PROT_WRITE, \
443 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); \
444 if ((_B) == (char *) -1) \
448 #else /* _G_HAVE_MMAP */
450 #define FREE_BUF(_B, _S) \
452 #define ALLOC_BUF(_B, _S, _R) \
454 (_B) = (char*)malloc(_S); \
459 #endif /* _G_HAVE_MMAP */
462 #define OS_FSTAT fstat
465 extern _IO_ssize_t _IO_read __P((int, void*, _IO_size_t));
466 extern _IO_ssize_t _IO_write __P((int, const void*, _IO_size_t));
467 extern _IO_off_t _IO_lseek __P((int, _IO_off_t, int));
468 extern int _IO_close __P((int));
469 extern int _IO_fstat __P((int, struct stat *));
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) \