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stdio.h (12790B)
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1 /* $OpenBSD: stdio.h,v 1.9 1997/11/29 20:01:03 millert Exp $ */
2 /* $NetBSD: stdio.h,v 1.18 1996/04/25 18:29:21 jtc Exp $ */
3
4 /*-
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Chris Torek.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * @(#)stdio.h 5.17 (Berkeley) 6/3/91
40 */
41
42 #ifndef _STDIO_H_
43 #define _STDIO_H_
44
45 #include <sys/types.h>
46
47 #define __P(x) x
48 #define __BEGIN_DECLS
49 #define __END_DECLS
50 #include <stdarg.h>
51 #define _BSD_VA_LIST_ va_list
52
53 #ifndef NULL
54 #define NULL 0
55 #endif
56
57 typedef off_t fpos_t;
58
59 #define _FSTDIO /* Define for new stdio with functions. */
60
61 /*
62 * NB: to fit things in six character monocase externals, the stdio
63 * code uses the prefix `__s' for stdio objects, typically followed
64 * by a three-character attempt at a mnemonic.
65 */
66
67 /* stdio buffers */
68 struct __sbuf {
69 unsigned char *_base;
70 int _size;
71 };
72
73 /*
74 * stdio state variables.
75 *
76 * The following always hold:
77 *
78 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
79 * _lbfsize is -_bf._size, else _lbfsize is 0
80 * if _flags&__SRD, _w is 0
81 * if _flags&__SWR, _r is 0
82 *
83 * This ensures that the getc and putc macros (or inline functions) never
84 * try to write or read from a file that is in `read' or `write' mode.
85 * (Moreover, they can, and do, automatically switch from read mode to
86 * write mode, and back, on "r+" and "w+" files.)
87 *
88 * _lbfsize is used only to make the inline line-buffered output stream
89 * code as compact as possible.
90 *
91 * _ub, _up, and _ur are used when ungetc() pushes back more characters
92 * than fit in the current _bf, or when ungetc() pushes back a character
93 * that does not match the previous one in _bf. When this happens,
94 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
95 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
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 */
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() optimisation */
146 #define __SNPT 0x0800 /* do not do fseek() optimisation */
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 should be the number of descriptors
169 * that the kernel can provide without allocation of a resource that can
170 * fail without the process sleeping. Do not use this for anything.
171 */
172 #define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */
173 #define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */
174
175 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
176 #ifndef _ANSI_SOURCE
177 #define P_tmpdir "/var/tmp/"
178 #endif
179 #define L_tmpnam 1024 /* XXX must be == PATH_MAX */
180 #define TMP_MAX 308915776
181
182 #ifndef SEEK_SET
183 #define SEEK_SET 0 /* set file offset to offset */
184 #endif
185 #ifndef SEEK_CUR
186 #define SEEK_CUR 1 /* set file offset to current plus offset */
187 #endif
188 #ifndef SEEK_END
189 #define SEEK_END 2 /* set file offset to EOF plus offset */
190 #endif
191
192 #define stdin (&__sF[0])
193 #define stdout (&__sF[1])
194 #define stderr (&__sF[2])
195
196 /*
197 * Functions defined in ANSI C standard.
198 */
199 __BEGIN_DECLS
200 void clearerr __P((FILE *));
201 int fclose __P((FILE *));
202 int feof __P((FILE *));
203 int ferror __P((FILE *));
204 int fflush __P((FILE *));
205 int fgetc __P((FILE *));
206 int fgetpos __P((FILE *, fpos_t *));
207 char *fgets __P((char *, int, FILE *));
208 FILE *fopen __P((const char *, const char *));
209 int fprintf __P((FILE *, const char *, ...));
210 int fputc __P((int, FILE *));
211 int fputs __P((const char *, FILE *));
212 size_t fread __P((void *, size_t, size_t, FILE *));
213 FILE *freopen __P((const char *, const char *, FILE *));
214 int fscanf __P((FILE *, const char *, ...));
215 int fseek __P((FILE *, long, int));
216 int fsetpos __P((FILE *, const fpos_t *));
217 long ftell __P((FILE *));
218 size_t fwrite __P((const void *, size_t, size_t, FILE *));
219 int getc __P((FILE *));
220 int getchar __P((void));
221 char *gets __P((char *));
222 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE) && !defined(__SYS_ERRLIST)
223 #define __SYS_ERRLIST
224
225 extern const int sys_nerr; /* perror(3) external variables */
226 extern const char *const sys_errlist[];
227 #endif
228 void perror __P((const char *));
229 int printf __P((const char *, ...));
230 int putc __P((int, FILE *));
231 int putchar __P((int));
232 int puts __P((const char *));
233 int remove __P((const char *));
234 int rename __P((const char *, const char *));
235 void rewind __P((FILE *));
236 int scanf __P((const char *, ...));
237 void setbuf __P((FILE *, char *));
238 int setvbuf __P((FILE *, char *, int, size_t));
239 int sprintf __P((char *, const char *, ...));
240 int sscanf __P((const char *, const char *, ...));
241 FILE *tmpfile __P((void));
242 char *tmpnam __P((char *));
243 int ungetc __P((int, FILE *));
244 int vfprintf __P((FILE *, const char *, _BSD_VA_LIST_));
245 int vprintf __P((const char *, _BSD_VA_LIST_));
246 int vsprintf __P((char *, const char *, _BSD_VA_LIST_));
247 __END_DECLS
248
249 /*
250 * Functions defined in POSIX 1003.1.
251 */
252 #ifndef _ANSI_SOURCE
253 #define L_ctermid 1024 /* size for ctermid(); PATH_MAX */
254 #define L_cuserid 9 /* size for cuserid(); UT_NAMESIZE + 1 */
255
256 __BEGIN_DECLS
257 char *ctermid __P((char *));
258 char *cuserid __P((char *));
259 FILE *fdopen __P((int, const char *));
260 int fileno __P((FILE *));
261 __END_DECLS
262 #endif /* not ANSI */
263
264 /*
265 * Routines that are purely local.
266 */
267 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
268 __BEGIN_DECLS
269 int asprintf __P((char **, const char *, ...))
270 __attribute__((format (printf, 2, 3)));
271 char *fgetln __P((FILE *, size_t *));
272 int fpurge __P((FILE *));
273 int getw __P((FILE *));
274 int pclose __P((FILE *));
275 FILE *popen __P((const char *, const char *));
276 int putw __P((int, FILE *));
277 void setbuffer __P((FILE *, char *, int));
278 int setlinebuf __P((FILE *));
279 char *tempnam __P((const char *, const char *));
280 int snprintf __P((char *, size_t, const char *, ...))
281 __attribute__((format (printf, 3, 4)));
282 int vasprintf __P((char **, const char *, _BSD_VA_LIST_))
283 __attribute__((format (printf, 2, 0)));
284 int vsnprintf __P((char *, size_t, const char *, _BSD_VA_LIST_))
285 __attribute__((format (printf, 3, 0)));
286 int vscanf __P((const char *, _BSD_VA_LIST_))
287 __attribute__((format (scanf, 1, 0)));
288 int vsscanf __P((const char *, const char *, _BSD_VA_LIST_))
289 __attribute__((format (scanf, 2, 0)));
290 __END_DECLS
291
292 /*
293 * This is a #define because the function is used internally and
294 * (unlike vfscanf) the name __svfscanf is guaranteed not to collide
295 * with a user function when _ANSI_SOURCE or _POSIX_SOURCE is defined.
296 */
297 #define vfscanf __svfscanf
298
299 /*
300 * Stdio function-access interface.
301 */
302 __BEGIN_DECLS
303 FILE *funopen __P((const void *,
304 int (*)(void *, char *, int),
305 int (*)(void *, const char *, int),
306 fpos_t (*)(void *, fpos_t, int),
307 int (*)(void *)));
308 __END_DECLS
309 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
310 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
311 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
312
313 /*
314 * Functions internal to the implementation.
315 */
316 __BEGIN_DECLS
317 int __srget __P((FILE *));
318 int __svfscanf __P((FILE *, const char *, _BSD_VA_LIST_));
319 int __swbuf __P((int, FILE *));
320 __END_DECLS
321
322 /*
323 * The __sfoo macros are here so that we can
324 * define function versions in the C library.
325 */
326 #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++))
327 #if defined(__GNUC__) && defined(__STDC__)
328 static __inline int __sputc(int _c, FILE *_p) {
329 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n'))
330 return (*_p->_p++ = _c);
331 else
332 return (__swbuf(_c, _p));
333 }
334 #else
335 /*
336 * This has been tuned to generate reasonable code on the vax using pcc.
337 */
338 #define __sputc(c, p) \
339 (--(p)->_w < 0 ? \
340 (p)->_w >= (p)->_lbfsize ? \
341 (*(p)->_p = (c)), *(p)->_p != '\n' ? \
342 (int)*(p)->_p++ : \
343 __swbuf('\n', p) : \
344 __swbuf((int)(c), p) : \
345 (*(p)->_p = (c), (int)*(p)->_p++))
346 #endif
347
348 #define __sfeof(p) (((p)->_flags & __SEOF) != 0)
349 #define __sferror(p) (((p)->_flags & __SERR) != 0)
350 #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
351 #define __sfileno(p) ((p)->_file)
352
353 #define feof(p) __sfeof(p)
354 #define ferror(p) __sferror(p)
355 #define clearerr(p) __sclearerr(p)
356
357 #ifndef _ANSI_SOURCE
358 #define fileno(p) __sfileno(p)
359 #endif
360
361 #ifndef lint
362 #define getc(fp) __sgetc(fp)
363 /*
364 * The macro implementation of putc is not fully POSIX
365 * compliant; it does not set errno on failure
366 */
367 #ifndef _POSIX_SOURCE
368 #define putc(x, fp) __sputc(x, fp)
369 #endif /* _POSIX_SOURCE */
370 #endif /* lint */
371
372 #define getchar() getc(stdin)
373 #define putchar(x) putc(x, stdout)
374 #endif /* _STDIO_H_ */