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ad061ad Initial revision
itojun authored
1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)stdio.h 8.5 (Berkeley) 4/29/95
37 * $Id: stdio.h,v 1.21.2.1 1999/05/05 22:14:47 dt Exp $
38 */
39
40 #ifndef _STDIO_H_
41 #define _STDIO_H_
42
43 #include <sys/cdefs.h>
44 #include <machine/ansi.h>
45
46 #ifdef _BSD_SIZE_T_
47 typedef _BSD_SIZE_T_ size_t;
48 #undef _BSD_SIZE_T_
49 #endif
50
51 #ifndef NULL
52 #define NULL 0
53 #endif
54
55 typedef _BSD_OFF_T_ fpos_t;
56
57 #define _FSTDIO /* Define for new stdio with functions. */
58
59 /*
60 * NB: to fit things in six character monocase externals, the stdio
61 * code uses the prefix `__s' for stdio objects, typically followed
62 * by a three-character attempt at a mnemonic.
63 */
64
65 /* stdio buffers */
66 struct __sbuf {
67 unsigned char *_base;
68 int _size;
69 };
70
71 /*
72 * stdio state variables.
73 *
74 * The following always hold:
75 *
76 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
77 * _lbfsize is -_bf._size, else _lbfsize is 0
78 * if _flags&__SRD, _w is 0
79 * if _flags&__SWR, _r is 0
80 *
81 * This ensures that the getc and putc macros (or inline functions) never
82 * try to write or read from a file that is in `read' or `write' mode.
83 * (Moreover, they can, and do, automatically switch from read mode to
84 * write mode, and back, on "r+" and "w+" files.)
85 *
86 * _lbfsize is used only to make the inline line-buffered output stream
87 * code as compact as possible.
88 *
89 * _ub, _up, and _ur are used when ungetc() pushes back more characters
90 * than fit in the current _bf, or when ungetc() pushes back a character
91 * that does not match the previous one in _bf. When this happens,
92 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
93 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
94 *
95 * NB: see WARNING above before changing the layout of this structure!
96 */
97 typedef struct __sFILE {
98 unsigned char *_p; /* current position in (some) buffer */
99 int _r; /* read space left for getc() */
100 int _w; /* write space left for putc() */
101 short _flags; /* flags, below; this FILE is free if 0 */
102 short _file; /* fileno, if Unix descriptor, else -1 */
103 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
104 int _lbfsize; /* 0 or -_bf._size, for inline putc */
105
106 /* operations */
107 void *_cookie; /* cookie passed to io functions */
108 int (*_close) __P((void *));
109 int (*_read) __P((void *, char *, int));
110 fpos_t (*_seek) __P((void *, fpos_t, int));
111 int (*_write) __P((void *, const char *, int));
112
113 /* separate buffer for long sequences of ungetc() */
114 struct __sbuf _ub; /* ungetc buffer */
115 unsigned char *_up; /* saved _p when _p is doing ungetc data */
116 int _ur; /* saved _r when _r is counting ungetc data */
117
118 /* tricks to meet minimum requirements even when malloc() fails */
119 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
120 unsigned char _nbuf[1]; /* guarantee a getc() buffer */
121
122 /* separate buffer for fgetln() when line crosses buffer boundary */
123 struct __sbuf _lb; /* buffer for fgetln() */
124
125 /* Unix stdio files get aligned to block boundaries on fseek() */
126 int _blksize; /* stat.st_blksize (may be != _bf._size) */
127 fpos_t _offset; /* current lseek offset (see WARNING) */
128 } FILE;
129
130 __BEGIN_DECLS
131 extern FILE __sF[];
132 __END_DECLS
133
134 #define __SLBF 0x0001 /* line buffered */
135 #define __SNBF 0x0002 /* unbuffered */
136 #define __SRD 0x0004 /* OK to read */
137 #define __SWR 0x0008 /* OK to write */
138 /* RD and WR are never simultaneously asserted */
139 #define __SRW 0x0010 /* open for reading & writing */
140 #define __SEOF 0x0020 /* found EOF */
141 #define __SERR 0x0040 /* found error */
142 #define __SMBF 0x0080 /* _buf is from malloc */
143 #define __SAPP 0x0100 /* fdopen()ed in append mode */
144 #define __SSTR 0x0200 /* this is an sprintf/snprintf string */
145 #define __SOPT 0x0400 /* do fseek() optimization */
146 #define __SNPT 0x0800 /* do not do fseek() optimization */
147 #define __SOFF 0x1000 /* set iff _offset is in fact correct */
148 #define __SMOD 0x2000 /* true => fgetln modified _p text */
149 #define __SALC 0x4000 /* allocate string space dynamically */
150
151 /*
152 * The following three definitions are for ANSI C, which took them
153 * from System V, which brilliantly took internal interface macros and
154 * made them official arguments to setvbuf(), without renaming them.
155 * Hence, these ugly _IOxxx names are *supposed* to appear in user code.
156 *
157 * Although numbered as their counterparts above, the implementation
158 * does not rely on this.
159 */
160 #define _IOFBF 0 /* setvbuf should set fully buffered */
161 #define _IOLBF 1 /* setvbuf should set line buffered */
162 #define _IONBF 2 /* setvbuf should set unbuffered */
163
164 #define BUFSIZ 1024 /* size of buffer used by setbuf */
165 #define EOF (-1)
166
167 /*
168 * FOPEN_MAX is a minimum maximum, and is the number of streams that
169 * stdio can provide without attempting to allocate further resources
170 * (which could fail). Do not use this for anything.
171 */
172 /* must be == _POSIX_STREAM_MAX <limits.h> */
173 #define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */
174 #define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */
175
176 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
177 #ifndef _ANSI_SOURCE
178 #define P_tmpdir "/var/tmp/"
179 #endif
180 #define L_tmpnam 1024 /* XXX must be == PATH_MAX */
181 #define TMP_MAX 308915776
182
183 #ifndef SEEK_SET
184 #define SEEK_SET 0 /* set file offset to offset */
185 #endif
186 #ifndef SEEK_CUR
187 #define SEEK_CUR 1 /* set file offset to current plus offset */
188 #endif
189 #ifndef SEEK_END
190 #define SEEK_END 2 /* set file offset to EOF plus offset */
191 #endif
192
193 #define stdin (&__sF[0])
194 #define stdout (&__sF[1])
195 #define stderr (&__sF[2])
196
197 /*
198 * Functions defined in ANSI C standard.
199 */
200 __BEGIN_DECLS
201 void clearerr __P((FILE *));
202 int fclose __P((FILE *));
203 int feof __P((FILE *));
204 int ferror __P((FILE *));
205 int fflush __P((FILE *));
206 int fgetc __P((FILE *));
207 int fgetpos __P((FILE *, fpos_t *));
208 char *fgets __P((char *, int, FILE *));
209 FILE *fopen __P((const char *, const char *));
210 int fprintf __P((FILE *, const char *, ...));
211 int fputc __P((int, FILE *));
212 int fputs __P((const char *, FILE *));
213 size_t fread __P((void *, size_t, size_t, FILE *));
214 FILE *freopen __P((const char *, const char *, FILE *));
215 int fscanf __P((FILE *, const char *, ...));
216 int fseek __P((FILE *, long, int));
217 int fsetpos __P((FILE *, const fpos_t *));
218 long ftell __P((FILE *));
219 size_t fwrite __P((const void *, size_t, size_t, FILE *));
220 int getc __P((FILE *));
221 int getchar __P((void));
222 char *gets __P((char *));
223 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
224 extern __const int sys_nerr; /* perror(3) external variables */
225 extern __const char *__const sys_errlist[];
226 #endif
227 void perror __P((const char *));
228 int printf __P((const char *, ...));
229 int putc __P((int, FILE *));
230 int putchar __P((int));
231 int puts __P((const char *));
232 int remove __P((const char *));
233 int rename __P((const char *, const char *));
234 void rewind __P((FILE *));
235 int scanf __P((const char *, ...));
236 void setbuf __P((FILE *, char *));
237 int setvbuf __P((FILE *, char *, int, size_t));
238 int sprintf __P((char *, const char *, ...));
239 int sscanf __P((const char *, const char *, ...));
240 FILE *tmpfile __P((void));
241 char *tmpnam __P((char *));
242 int ungetc __P((int, FILE *));
243 int vfprintf __P((FILE *, const char *, _BSD_VA_LIST_));
244 int vprintf __P((const char *, _BSD_VA_LIST_));
245 int vsprintf __P((char *, const char *, _BSD_VA_LIST_));
246 __END_DECLS
247
248 /*
249 * Functions defined in POSIX 1003.1.
250 */
251 #ifndef _ANSI_SOURCE
252 /* size for cuserid(3); UT_NAMESIZE + 1, see <utmp.h> */
253 #define L_cuserid 17
254
255 #define L_ctermid 1024 /* size for ctermid(3); PATH_MAX */
256
257 __BEGIN_DECLS
258 char *ctermid __P((char *));
259 FILE *fdopen __P((int, const char *));
260 int fileno __P((FILE *));
261 int ftrylockfile __P((FILE *));
262 void flockfile __P((FILE *));
263 void funlockfile __P((FILE *));
264 __END_DECLS
265 #endif /* not ANSI */
266
267 /*
268 * Portability hacks. See <sys/types.h>.
269 */
270 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
271 __BEGIN_DECLS
272 #ifndef _FTRUNCATE_DECLARED
273 #define _FTRUNCATE_DECLARED
274 int ftruncate __P((int, _BSD_OFF_T_));
275 #endif
276 #ifndef _LSEEK_DECLARED
277 #define _LSEEK_DECLARED
278 _BSD_OFF_T_ lseek __P((int, _BSD_OFF_T_, int));
279 #endif
280 #ifndef _MMAP_DECLARED
281 #define _MMAP_DECLARED
282 void *mmap __P((void *, size_t, int, int, int, _BSD_OFF_T_));
283 #endif
284 #ifndef _TRUNCATE_DECLARED
285 #define _TRUNCATE_DECLARED
286 int truncate __P((const char *, _BSD_OFF_T_));
287 #endif
288 __END_DECLS
289 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
290
291 /*
292 * Routines that are purely local.
293 */
294 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
295 __BEGIN_DECLS
296 int asprintf __P((char **, const char *, ...)) __printflike(2, 3);
297 char *fgetln __P((FILE *, size_t *));
298 int fpurge __P((FILE *));
299 int fseeko __P((FILE *, _BSD_OFF_T_, int));
300 _BSD_OFF_T_ ftello __P((FILE *));
301 int getw __P((FILE *));
302 int pclose __P((FILE *));
303 FILE *popen __P((const char *, const char *));
304 int putw __P((int, FILE *));
305 void setbuffer __P((FILE *, char *, int));
306 int setlinebuf __P((FILE *));
307 char *tempnam __P((const char *, const char *));
308 int snprintf __P((char *, size_t, const char *, ...)) __printflike(3, 4);
309 int vasprintf __P((char **, const char *, _BSD_VA_LIST_))
310 __printflike(2, 0);
311 int vsnprintf __P((char *, size_t, const char *, _BSD_VA_LIST_))
312 __printflike(3, 0);
313 int vscanf __P((const char *, _BSD_VA_LIST_)) __scanflike(1, 0);
314 int vsscanf __P((const char *, const char *, _BSD_VA_LIST_))
315 __scanflike(2, 0);
316 __END_DECLS
317
318 /*
319 * This is a #define because the function is used internally and
320 * (unlike vfscanf) the name __svfscanf is guaranteed not to collide
321 * with a user function when _ANSI_SOURCE or _POSIX_SOURCE is defined.
322 */
323 #define vfscanf __svfscanf
324
325 /*
326 * Stdio function-access interface.
327 */
328 __BEGIN_DECLS
329 FILE *funopen __P((const void *,
330 int (*)(void *, char *, int),
331 int (*)(void *, const char *, int),
332 fpos_t (*)(void *, fpos_t, int),
333 int (*)(void *)));
334 __END_DECLS
335 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
336 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
337 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
338
339 /*
340 * Functions internal to the implementation.
341 */
342 __BEGIN_DECLS
343 int __srget __P((FILE *));
344 int __svfscanf __P((FILE *, const char *, _BSD_VA_LIST_));
345 int __swbuf __P((int, FILE *));
346 __END_DECLS
347
348 /*
349 * The __sfoo macros are here so that we can
350 * define function versions in the C library.
351 */
352 #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++))
353 #if defined(__GNUC__) && defined(__STDC__)
354 static __inline int __sputc(int _c, FILE *_p) {
355 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n'))
356 return (*_p->_p++ = _c);
357 else
358 return (__swbuf(_c, _p));
359 }
360 #else
361 /*
362 * This has been tuned to generate reasonable code on the vax using pcc.
363 */
364 #define __sputc(c, p) \
365 (--(p)->_w < 0 ? \
366 (p)->_w >= (p)->_lbfsize ? \
367 (*(p)->_p = (c)), *(p)->_p != '\n' ? \
368 (int)*(p)->_p++ : \
369 __swbuf('\n', p) : \
370 __swbuf((int)(c), p) : \
371 (*(p)->_p = (c), (int)*(p)->_p++))
372 #endif
373
374 #define __sfeof(p) (((p)->_flags & __SEOF) != 0)
375 #define __sferror(p) (((p)->_flags & __SERR) != 0)
376 #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
377 #define __sfileno(p) ((p)->_file)
378
379 /*
380 * See ISO/IEC 9945-1 ANSI/IEEE Std 1003.1 Second Edition 1996-07-12
381 * B.8.2.7 for the rationale behind the *_unlocked() macros.
382 */
383 #define feof_unlocked(p) __sfeof(p)
384 #define ferror_unlocked(p) __sferror(p)
385 #define clearerr_unlocked(p) __sclearerr(p)
386
387 #ifndef _ANSI_SOURCE
388 #define fileno_unlocked(p) __sfileno(p)
389 #endif
390
391 #ifndef _THREAD_SAFE
392 #define feof(p) feof_unlocked(p)
393 #define ferror(p) ferror_unlocked(p)
394 #define clearerr(p) clearerr_unlocked(p)
395
396 #ifndef _ANSI_SOURCE
397 #define fileno(p) fileno_unlocked(p)
398 #endif
399 #endif
400
401 #ifndef lint
402 #define getc_unlocked(fp) __sgetc(fp)
403 #define putc_unlocked(x, fp) __sputc(x, fp)
404 #ifdef _THREAD_SAFE
405 void _flockfile_debug __P((FILE *, char *, int));
406 #ifdef _FLOCK_DEBUG
407 #define _FLOCKFILE(x) _flockfile_debug(x, __FILE__, __LINE__)
408 #else
409 #define _FLOCKFILE(x) flockfile(x)
410 #endif
411 static __inline int \
412 __getc_locked(FILE *_fp) \
413 { \
414 extern int __isthreaded; \
415 int _ret; \
416 if (__isthreaded) \
417 _FLOCKFILE(_fp); \
418 _ret = getc_unlocked(_fp); \
419 if (__isthreaded) \
420 funlockfile(_fp); \
421 return (_ret); \
422 }
423 static __inline int \
424 __putc_locked(int _x, FILE *_fp) \
425 { \
426 extern int __isthreaded; \
427 int _ret; \
428 if (__isthreaded) \
429 _FLOCKFILE(_fp); \
430 _ret = putc_unlocked(_x, _fp); \
431 if (__isthreaded) \
432 funlockfile(_fp); \
433 return (_ret); \
434 }
435 #define getc(fp) __getc_locked(fp)
436 #define putc(x, fp) __putc_locked(x, fp)
437 #else
438 #define getc(fp) getc_unlocked(fp)
439 #define putc(x, fp) putc_unlocked(x, fp)
440 #endif
441 #endif /* lint */
442
443 #define getchar() getc(stdin)
444 #define getchar_unlocked() getc_unlocked(stdin)
445 #define putchar(x) putc(x, stdout)
446 #define putchar_unlocked(x) putc_unlocked(x, stdout)
447
448 #endif /* !_STDIO_H_ */
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