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[glibc.git] / libio / libioP.h
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1 /*
2 Copyright (C) 1993 Free Software Foundation
4 This file is part of the GNU IO Library. This library is free
5 software; you can redistribute it and/or modify it under the
6 terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option)
8 any later version.
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this library; see the file COPYING. If not, write to the Free
17 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 As a special exception, if you link this library with files
20 compiled with a GNU compiler to produce an executable, this does not cause
21 the resulting executable to be covered by the GNU General Public License.
22 This exception does not however invalidate any other reasons why
23 the executable file might be covered by the GNU General Public License. */
25 #include <errno.h>
26 #ifndef errno
27 extern int errno;
28 #endif
29 #include <libc-lock.h>
31 #include "iolibio.h"
33 #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(__cplusplus)
34 /* All known AIX compilers implement these things (but don't always
35 define __STDC__). The RISC/OS MIPS compiler defines these things
36 in SVR4 mode, but does not define __STDC__. */
38 #define AND ,
39 #define DEFUN(name, arglist, args) name(args)
40 #define DEFUN_VOID(name) name(void)
42 #else /* Not ANSI C. */
44 #define AND ;
45 #ifndef const /* some systems define it in header files for non-ansi mode */
46 #define const
47 #endif
48 #define DEFUN(name, arglist, args) name arglist args;
49 #define DEFUN_VOID(name) name()
50 #endif /* ANSI C. */
52 #ifdef __cplusplus
53 extern "C" {
54 #endif
56 #define _IO_seek_set 0
57 #define _IO_seek_cur 1
58 #define _IO_seek_end 2
60 /* THE JUMPTABLE FUNCTIONS.
62 * The _IO_FILE type is used to implement the FILE type in GNU libc,
63 * as well as the streambuf class in GNU iostreams for C++.
64 * These are all the same, just used differently.
65 * An _IO_FILE (or FILE) object is allows followed by a pointer to
66 * a jump table (of pointers to functions). The pointer is accessed
67 * with the _IO_JUMPS macro. The jump table has a eccentric format,
68 * so as to be compatible with the layout of a C++ virtual function table.
69 * (as implemented by g++). When a pointer to a streambuf object is
70 * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
71 * happens to point to the virtual function table of the streambuf.
72 * Thus the _IO_JUMPS function table used for C stdio/libio does
73 * double duty as the virtual function table for C++ streambuf.
75 * The entries in the _IO_JUMPS function table (and hence also the
76 * virtual functions of a streambuf) are described below.
77 * The first parameter of each function entry is the _IO_FILE/streambuf
78 * object being acted on (i.e. the 'this' parameter).
81 #define _IO_JUMPS(THIS) ((struct _IO_FILE_plus*)(THIS))->vtable
82 #ifdef _G_USING_THUNKS
83 #define JUMP_FIELD(TYPE, NAME) TYPE NAME
84 #define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC(THIS)
85 #define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC(THIS, X1)
86 #define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC(THIS, X1, X2)
87 #define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC(THIS, X1,X2, X3)
88 #define JUMP_INIT(NAME, VALUE) VALUE
89 #define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT(dummy2, 0)
90 #else
91 /* These macros will change when we re-implement vtables to use "thunks"! */
92 #define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
93 #define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC.pfn(THIS)
94 #define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1)
95 #define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1, X2)
96 #define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1,X2, X3)
97 #define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
98 #define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
99 #endif
101 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
102 It does not delete (free) it, but does everything else to finalize it/
103 It matches the streambuf::~streambuf virtual destructor. */
104 typedef void (*_IO_finish_t) __P((_IO_FILE*, int)); /* finalize */
105 #define _IO_FINISH(FP) JUMP1(__finish, FP, 0)
107 /* The 'overflow' hook flushes the buffer.
108 The second argument is a character, or EOF.
109 It matches the streambuf::overflow virtual function. */
110 typedef int (*_IO_overflow_t) __P((_IO_FILE*, int));
111 #define _IO_OVERFLOW(FP, CH) JUMP1(__overflow, FP, CH)
113 /* The 'underflow' hook tries to fills the get buffer.
114 It returns the next character (as an unsigned char) or EOF. The next
115 character remains in the get buffer, and the get position is not changed.
116 It matches the streambuf::underflow virtual function. */
117 typedef int (*_IO_underflow_t) __P((_IO_FILE*));
118 #define _IO_UNDERFLOW(FP) JUMP0(__underflow, FP)
120 /* The 'uflow' hook returns the next character in the input stream
121 (cast to unsigned char), and increments the read position;
122 EOF is returned on failure.
123 It matches the streambuf::uflow virtual function, which is not in the
124 cfront implementation, but was added to C++ by the ANSI/ISO committee. */
125 #define _IO_UFLOW(FP) JUMP0(__uflow, FP)
127 /* The 'pbackfail' hook handles backing up.
128 It matches the streambuf::pbackfail virtual function. */
129 typedef int (*_IO_pbackfail_t) __P((_IO_FILE*, int));
130 #define _IO_PBACKFAIL(FP, CH) JUMP1(__pbackfail, FP, CH)
132 /* The 'xsputn' hook writes upto N characters from buffer DATA.
133 Returns the number of character actually written.
134 It matches the streambuf::xsputn virtual function. */
135 typedef _IO_size_t (*_IO_xsputn_t)
136 __P((_IO_FILE *FP, const void *DATA, _IO_size_t N));
137 #define _IO_XSPUTN(FP, DATA, N) JUMP2(__xsputn, FP, DATA, N)
139 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
140 Returns the number of character actually read.
141 It matches the streambuf::xsgetn virtual function. */
142 typedef _IO_size_t (*_IO_xsgetn_t) __P((_IO_FILE*FP, void*DATA, _IO_size_t N));
143 #define _IO_XSGETN(FP, DATA, N) JUMP2(__xsgetn, FP, DATA, N)
145 /* The 'seekoff' hook moves the stream position to a new position
146 relative to the start of the file (if DIR==0), the current position
147 (MODE==1), or the end of the file (MODE==2).
148 It matches the streambuf::seekoff virtual function.
149 It is also used for the ANSI fseek function. */
150 typedef _IO_fpos_t (*_IO_seekoff_t)
151 __P((_IO_FILE* FP, _IO_off_t OFF, int DIR, int MODE));
152 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3(__seekoff, FP, OFF, DIR, MODE)
154 /* The 'seekpos' hook also moves the stream position,
155 but to an absolute position given by a fpos_t (seekpos).
156 It matches the streambuf::seekpos virtual function.
157 It is also used for the ANSI fgetpos and fsetpos functions. */
158 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
159 typedef _IO_fpos_t (*_IO_seekpos_t) __P((_IO_FILE*, _IO_fpos_t, int));
160 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2(__seekpos, FP, POS, FLAGS)
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)
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)
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)
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. */
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)
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)
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 typedef _IO_fpos_t (*_IO_seek_t) __P((_IO_FILE*, _IO_off_t, int));
209 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2(__seek, FP, OFFSET, MODE)
211 /* The 'sysclose' hook is used to finalize (close, finish up) an
212 external file. It generalizes the Unix close(2) function.
213 It matches the streambuf::sys_close virtual function, which is
214 specific to this implementation. */
215 typedef int (*_IO_close_t) __P((_IO_FILE*)); /* finalize */
216 #define _IO_SYSCLOSE(FP) JUMP0(__close, FP)
218 /* The 'sysstat' hook is used to get information about an external file
219 into a struct stat buffer. It generalizes the Unix fstat(2) call.
220 It matches the streambuf::sys_stat virtual function, which is
221 specific to this implementation. */
222 typedef int (*_IO_stat_t) __P((_IO_FILE*, void*));
223 #define _IO_SYSSTAT(FP, BUF) JUMP1(__stat, FP, BUF)
226 #define _IO_CHAR_TYPE char /* unsigned char ? */
227 #define _IO_INT_TYPE int
229 struct _IO_jump_t {
230 JUMP_FIELD(_G_size_t, __dummy);
231 #ifdef _G_USING_THUNKS
232 JUMP_FIELD(_G_size_t, __dummy2);
233 #endif
234 JUMP_FIELD(_IO_finish_t, __finish);
235 JUMP_FIELD(_IO_overflow_t, __overflow);
236 JUMP_FIELD(_IO_underflow_t, __underflow);
237 JUMP_FIELD(_IO_underflow_t, __uflow);
238 JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
239 /* showmany */
240 JUMP_FIELD(_IO_xsputn_t, __xsputn);
241 JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
242 JUMP_FIELD(_IO_seekoff_t, __seekoff);
243 JUMP_FIELD(_IO_seekpos_t, __seekpos);
244 JUMP_FIELD(_IO_setbuf_t, __setbuf);
245 JUMP_FIELD(_IO_sync_t, __sync);
246 JUMP_FIELD(_IO_doallocate_t, __doallocate);
247 JUMP_FIELD(_IO_read_t, __read);
248 JUMP_FIELD(_IO_write_t, __write);
249 JUMP_FIELD(_IO_seek_t, __seek);
250 JUMP_FIELD(_IO_close_t, __close);
251 JUMP_FIELD(_IO_stat_t, __stat);
252 #if 0
253 get_column;
254 set_column;
255 #endif
258 /* We always allocate an extra word following an _IO_FILE.
259 This contains a pointer to the function jump table used.
260 This is for compatibility with C++ streambuf; the word can
261 be used to smash to a pointer to a virtual function table. */
263 struct _IO_FILE_plus {
264 _IO_FILE file;
265 const struct _IO_jump_t *vtable;
268 /* Generic functions */
270 extern _IO_fpos_t _IO_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
271 extern _IO_fpos_t _IO_seekpos __P((_IO_FILE*, _IO_fpos_t, int));
273 extern int _IO_switch_to_get_mode __P((_IO_FILE*));
274 extern void _IO_init __P((_IO_FILE*, int));
275 extern int _IO_sputbackc __P((_IO_FILE*, int));
276 extern int _IO_sungetc __P((_IO_FILE*));
277 extern void _IO_un_link __P((_IO_FILE*));
278 extern void _IO_link_in __P((_IO_FILE *));
279 extern void _IO_doallocbuf __P((_IO_FILE*));
280 extern void _IO_unsave_markers __P((_IO_FILE*));
281 extern void _IO_setb __P((_IO_FILE*, char*, char*, int));
282 extern unsigned _IO_adjust_column __P((unsigned, const char *, int));
283 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN(__fp, __s, __n)
285 /* Marker-related function. */
287 extern void _IO_init_marker __P((struct _IO_marker *, _IO_FILE *));
288 extern void _IO_remove_marker __P((struct _IO_marker*));
289 extern int _IO_marker_difference __P((struct _IO_marker *, struct _IO_marker *));
290 extern int _IO_marker_delta __P((struct _IO_marker *));
291 extern int _IO_seekmark __P((_IO_FILE *, struct _IO_marker *, int));
293 /* Default jumptable functions. */
295 extern int _IO_default_underflow __P((_IO_FILE*));
296 extern int _IO_default_uflow __P((_IO_FILE*));
297 extern int _IO_default_doallocate __P((_IO_FILE*));
298 extern void _IO_default_finish __P((_IO_FILE *, int));
299 extern int _IO_default_pbackfail __P((_IO_FILE*, int));
300 extern _IO_FILE* _IO_default_setbuf __P((_IO_FILE *, char*, _IO_ssize_t));
301 extern _IO_size_t _IO_default_xsputn __P((_IO_FILE *, const void*, _IO_size_t));
302 extern _IO_size_t _IO_default_xsgetn __P((_IO_FILE *, void*, _IO_size_t));
303 extern _IO_fpos_t _IO_default_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
304 extern _IO_fpos_t _IO_default_seekpos __P((_IO_FILE*, _IO_fpos_t, int));
305 extern _IO_ssize_t _IO_default_write __P((_IO_FILE*,const void*,_IO_ssize_t));
306 extern _IO_ssize_t _IO_default_read __P((_IO_FILE*, void*, _IO_ssize_t));
307 extern int _IO_default_stat __P((_IO_FILE*, void*));
308 extern _IO_fpos_t _IO_default_seek __P((_IO_FILE*, _IO_off_t, int));
309 extern int _IO_default_sync __P((_IO_FILE*));
310 #define _IO_default_close ((_IO_close_t)_IO_default_sync)
312 extern struct _IO_jump_t _IO_file_jumps;
313 extern struct _IO_jump_t _IO_streambuf_jumps;
314 extern struct _IO_jump_t _IO_proc_jumps;
315 extern struct _IO_jump_t _IO_str_jumps;
316 extern int _IO_do_write __P((_IO_FILE*, const char*, _IO_size_t));
317 extern int _IO_flush_all __P((void));
318 extern void _IO_cleanup __P((void));
319 extern void _IO_flush_all_linebuffered __P((void));
321 #define _IO_do_flush(_f) \
322 _IO_do_write(_f, (_f)->_IO_write_base, \
323 (_f)->_IO_write_ptr-(_f)->_IO_write_base)
324 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
325 #define _IO_mask_flags(fp, f, mask) \
326 ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
327 #define _IO_setg(fp, eb, g, eg) ((fp)->_IO_read_base = (eb),\
328 (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
329 #define _IO_setp(__fp, __p, __ep) \
330 ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
331 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
332 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
333 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
334 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
336 /* Jumptable functions for files. */
338 extern int _IO_file_doallocate __P((_IO_FILE*));
339 extern _IO_FILE* _IO_file_setbuf __P((_IO_FILE *, char*, _IO_ssize_t));
340 extern _IO_fpos_t _IO_file_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
341 extern _IO_size_t _IO_file_xsputn __P((_IO_FILE*,const void*,_IO_size_t));
342 extern int _IO_file_stat __P((_IO_FILE*, void*));
343 extern int _IO_file_close __P((_IO_FILE*));
344 extern int _IO_file_underflow __P((_IO_FILE *));
345 extern int _IO_file_overflow __P((_IO_FILE *, int));
346 #define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
347 extern void _IO_file_init __P((_IO_FILE*));
348 extern _IO_FILE* _IO_file_attach __P((_IO_FILE*, int));
349 extern _IO_FILE* _IO_file_fopen __P((_IO_FILE*, const char*, const char*));
350 extern _IO_ssize_t _IO_file_write __P((_IO_FILE*,const void*,_IO_ssize_t));
351 extern _IO_ssize_t _IO_file_read __P((_IO_FILE*, void*, _IO_ssize_t));
352 extern int _IO_file_sync __P((_IO_FILE*));
353 extern int _IO_file_close_it __P((_IO_FILE*));
354 extern _IO_fpos_t _IO_file_seek __P((_IO_FILE *, _IO_off_t, int));
355 extern void _IO_file_finish __P((_IO_FILE*, int));
357 /* Other file functions. */
358 extern _IO_FILE* _IO_file_attach __P((_IO_FILE *, int));
360 /* Jumptable functions for proc_files. */
361 extern _IO_FILE* _IO_proc_open __P((_IO_FILE*, const char*, const char *));
362 extern int _IO_proc_close __P((_IO_FILE*));
364 /* Jumptable functions for strfiles. */
365 extern int _IO_str_underflow __P((_IO_FILE*));
366 extern int _IO_str_overflow __P((_IO_FILE *, int));
367 extern int _IO_str_pbackfail __P((_IO_FILE*, int));
368 extern _IO_fpos_t _IO_str_seekoff __P((_IO_FILE*,_IO_off_t,int,int));
369 extern void _IO_str_finish __P ((_IO_FILE*, int));
371 /* Other strfile functions */
372 extern void _IO_str_init_static __P((_IO_FILE *, char*, int, char*));
373 extern void _IO_str_init_readonly __P((_IO_FILE *, const char*, int));
374 extern _IO_ssize_t _IO_str_count __P ((_IO_FILE*));
376 extern int _IO_vasprintf __P ((char **result_ptr, __const char *format,
377 _IO_va_list args));
378 extern int _IO_vdprintf __P ((int d, __const char *format, _IO_va_list arg));
379 extern int _IO_vsnprintf __P ((char *string, _IO_size_t maxlen,
380 __const char *format, _IO_va_list args));
383 extern _IO_size_t _IO_getline __P((_IO_FILE*,char*,_IO_size_t,int,int));
384 extern _IO_ssize_t _IO_getdelim __P((char**, _IO_size_t*, int, _IO_FILE*));
385 extern double _IO_strtod __P((const char *, char **));
386 extern char * _IO_dtoa __P((double __d, int __mode, int __ndigits,
387 int *__decpt, int *__sign, char **__rve));
388 extern int _IO_outfloat __P((double __value, _IO_FILE *__sb, int __type,
389 int __width, int __precision, int __flags,
390 int __sign_mode, int __fill));
392 extern _IO_FILE *_IO_list_all;
393 extern void (*_IO_cleanup_registration_needed) __P ((void));
395 #ifndef EOF
396 #define EOF (-1)
397 #endif
398 #ifndef NULL
399 #if defined __GNUG__ && \
400 (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
401 #define NULL (__null)
402 #else
403 #if !defined(__cplusplus)
404 #define NULL ((void*)0)
405 #else
406 #define NULL (0)
407 #endif
408 #endif
409 #endif
411 #if _G_HAVE_MMAP
413 #include <unistd.h>
414 #include <fcntl.h>
415 #include <sys/mman.h>
416 #include <sys/param.h>
418 #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
419 #define MAP_ANONYMOUS MAP_ANON
420 #endif
422 #if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
423 #undef _G_HAVE_MMAP
424 #define _G_HAVE_MMAP 0
425 #endif
427 #endif /* _G_HAVE_MMAP */
429 #if _G_HAVE_MMAP
431 #ifdef _LIBC
432 /* When using this code in the GNU libc we must not pollute the name space. */
433 #define mmap __mmap
434 #define munmap __munmap
435 #endif
437 #define ROUND_TO_PAGE(_S) \
438 (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
440 #define FREE_BUF(_B, _S) \
441 munmap ((_B), ROUND_TO_PAGE (_S))
442 #define ALLOC_BUF(_B, _S, _R) \
443 do { \
444 (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S), \
445 PROT_READ | PROT_WRITE, \
446 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); \
447 if ((_B) == (char *) -1) \
448 return (_R); \
449 } while (0)
451 #else /* _G_HAVE_MMAP */
453 #define FREE_BUF(_B, _S) \
454 free(_B)
455 #define ALLOC_BUF(_B, _S, _R) \
456 do { \
457 (_B) = (char*)malloc(_S); \
458 if ((_B) == NULL) \
459 return (_R); \
460 } while (0)
462 #endif /* _G_HAVE_MMAP */
464 #ifndef OS_FSTAT
465 #define OS_FSTAT fstat
466 #endif
467 struct stat;
468 extern _IO_ssize_t _IO_read __P((int, void*, _IO_size_t));
469 extern _IO_ssize_t _IO_write __P((int, const void*, _IO_size_t));
470 extern _IO_off_t _IO_lseek __P((int, _IO_off_t, int));
471 extern int _IO_close __P((int));
472 extern int _IO_fstat __P((int, struct stat *));
473 extern int _IO_vscanf __P((const char *, _IO_va_list));
475 /* Operations on _IO_fpos_t.
476 Normally, these are trivial, but we provide hooks for configurations
477 where an _IO_fpos_t is a struct.
478 Note that _IO_off_t must be an integral type. */
480 /* _IO_pos_BAD is an _IO_fpos_t value indicating error, unknown, or EOF. */
481 #ifndef _IO_pos_BAD
482 #define _IO_pos_BAD ((_IO_fpos_t)(-1))
483 #endif
484 /* _IO_pos_as_off converts an _IO_fpos_t value to an _IO_off_t value. */
485 #ifndef _IO_pos_as_off
486 #define _IO_pos_as_off(__pos) ((_IO_off_t)(__pos))
487 #endif
488 /* _IO_pos_adjust adjust an _IO_fpos_t by some number of bytes. */
489 #ifndef _IO_pos_adjust
490 #define _IO_pos_adjust(__pos, __delta) ((__pos) += (__delta))
491 #endif
492 /* _IO_pos_0 is an _IO_fpos_t value indicating beginning of file. */
493 #ifndef _IO_pos_0
494 #define _IO_pos_0 ((_IO_fpos_t)0)
495 #endif
497 #ifdef __cplusplus
499 #endif
501 #ifdef _IO_MTSAFE_IO
502 /* check following! */
503 #define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
504 { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
505 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
506 0, 0, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
507 #else
508 /* check following! */
509 #define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
510 { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
511 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD }
512 #endif
514 /* VTABLE_LABEL defines NAME as of the CLASS class.
515 CNLENGTH is strlen(#CLASS). */
516 #ifdef __GNUC__
517 #if _G_VTABLE_LABEL_HAS_LENGTH
518 #define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
519 extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
520 #else
521 #define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
522 extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
523 #endif
524 #endif /* __GNUC__ */
526 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
527 #ifdef __GNUC__
528 VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
529 #else
530 #if _G_VTABLE_LABEL_HAS_LENGTH
531 #define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
532 #else
533 #define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
534 #endif
535 #endif
536 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
538 #if defined(__STDC__) || defined(__cplusplus)
539 #define _IO_va_start(args, last) va_start(args, last)
540 #else
541 #define _IO_va_start(args, last) va_start(args)
542 #endif
544 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
546 #if 1
547 #define COERCE_FILE(FILE) /* Nothing */
548 #else
549 /* This is part of the kludge for binary compatibility with old stdio. */
550 #define COERCE_FILE(FILE) \
551 (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
552 && (FILE) = *(FILE**)&((int*)fp)[1])
553 #endif
555 #ifdef EINVAL
556 #define MAYBE_SET_EINVAL __set_errno (EINVAL)
557 #else
558 #define MAYBE_SET_EINVAL /* nothing */
559 #endif
561 #ifdef IO_DEBUG
562 #define CHECK_FILE(FILE,RET) \
563 if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
564 else { COERCE_FILE(FILE); \
565 if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
566 { MAYBE_SET_EINVAL; return RET; }}
567 #else
568 #define CHECK_FILE(FILE,RET) \
569 COERCE_FILE(FILE)
570 #endif