2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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36 * @(#)stdio.h 8.5 (Berkeley) 4/29/95
43 #include <sys/cdefs.h>
44 #include <machine/ansi.h>
47 typedef _BSD_SIZE_T_ size_t;
55 typedef _BSD_OFF_T_ fpos_t;
57 #define _FSTDIO /* Define for new stdio with functions. */
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.
71 /* hold a buncha junk that would grow the ABI */
75 * stdio state variables.
77 * The following always hold:
79 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
80 * _lbfsize is -_bf._size, else _lbfsize is 0
81 * if _flags&__SRD, _w is 0
82 * if _flags&__SWR, _r is 0
84 * This ensures that the getc and putc macros (or inline functions) never
85 * try to write or read from a file that is in `read' or `write' mode.
86 * (Moreover, they can, and do, automatically switch from read mode to
87 * write mode, and back, on "r+" and "w+" files.)
89 * _lbfsize is used only to make the inline line-buffered output stream
90 * code as compact as possible.
92 * _ub, _up, and _ur are used when ungetc() pushes back more characters
93 * than fit in the current _bf, or when ungetc() pushes back a character
94 * that does not match the previous one in _bf. When this happens,
95 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
96 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
98 * NB: see WARNING above before changing the layout of this structure!
100 typedef struct __sFILE {
101 unsigned char *_p; /* current position in (some) buffer */
102 int _r; /* read space left for getc() */
103 int _w; /* write space left for putc() */
104 short _flags; /* flags, below; this FILE is free if 0 */
105 short _file; /* fileno, if Unix descriptor, else -1 */
106 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
107 int _lbfsize; /* 0 or -_bf._size, for inline putc */
110 void *_cookie; /* cookie passed to io functions */
111 int (*_close) __P((void *));
112 int (*_read) __P((void *, char *, int));
113 fpos_t (*_seek) __P((void *, fpos_t, int));
114 int (*_write) __P((void *, const char *, int));
116 /* separate buffer for long sequences of ungetc() */
117 struct __sbuf _ub; /* ungetc buffer */
118 struct __sFILEX *_extra; /* additions to FILE to not break ABI */
119 int _ur; /* saved _r when _r is counting ungetc data */
121 /* tricks to meet minimum requirements even when malloc() fails */
122 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
123 unsigned char _nbuf[1]; /* guarantee a getc() buffer */
125 /* separate buffer for fgetln() when line crosses buffer boundary */
126 struct __sbuf _lb; /* buffer for fgetln() */
128 /* Unix stdio files get aligned to block boundaries on fseek() */
129 int _blksize; /* stat.st_blksize (may be != _bf._size) */
130 fpos_t _offset; /* current lseek offset (see WARNING) */
137 #define __SLBF 0x0001 /* line buffered */
138 #define __SNBF 0x0002 /* unbuffered */
139 #define __SRD 0x0004 /* OK to read */
140 #define __SWR 0x0008 /* OK to write */
141 /* RD and WR are never simultaneously asserted */
142 #define __SRW 0x0010 /* open for reading & writing */
143 #define __SEOF 0x0020 /* found EOF */
144 #define __SERR 0x0040 /* found error */
145 #define __SMBF 0x0080 /* _buf is from malloc */
146 #define __SAPP 0x0100 /* fdopen()ed in append mode */
147 #define __SSTR 0x0200 /* this is an sprintf/snprintf string */
148 #define __SOPT 0x0400 /* do fseek() optimization */
149 #define __SNPT 0x0800 /* do not do fseek() optimization */
150 #define __SOFF 0x1000 /* set iff _offset is in fact correct */
151 #define __SMOD 0x2000 /* true => fgetln modified _p text */
152 #define __SALC 0x4000 /* allocate string space dynamically */
153 #define __SIGN 0x8000 /* ignore this file in _fwalk */
156 * The following three definitions are for ANSI C, which took them
157 * from System V, which brilliantly took internal interface macros and
158 * made them official arguments to setvbuf(), without renaming them.
159 * Hence, these ugly _IOxxx names are *supposed* to appear in user code.
161 * Although numbered as their counterparts above, the implementation
162 * does not rely on this.
164 #define _IOFBF 0 /* setvbuf should set fully buffered */
165 #define _IOLBF 1 /* setvbuf should set line buffered */
166 #define _IONBF 2 /* setvbuf should set unbuffered */
168 #define BUFSIZ 1024 /* size of buffer used by setbuf */
172 * FOPEN_MAX is a minimum maximum, and is the number of streams that
173 * stdio can provide without attempting to allocate further resources
174 * (which could fail). Do not use this for anything.
176 /* must be == _POSIX_STREAM_MAX <limits.h> */
177 #define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */
178 #define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */
180 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
182 #define P_tmpdir "/var/tmp/"
184 #define L_tmpnam 1024 /* XXX must be == PATH_MAX */
185 #define TMP_MAX 308915776
188 #define SEEK_SET 0 /* set file offset to offset */
191 #define SEEK_CUR 1 /* set file offset to current plus offset */
194 #define SEEK_END 2 /* set file offset to EOF plus offset */
197 #define stdin (&__sF[0])
198 #define stdout (&__sF[1])
199 #define stderr (&__sF[2])
202 * Functions defined in ANSI C standard.
205 void clearerr __P((FILE *));
206 int fclose __P((FILE *));
207 int feof __P((FILE *));
208 int ferror __P((FILE *));
209 int fflush __P((FILE *));
210 int fgetc __P((FILE *));
211 int fgetpos __P((FILE *, fpos_t *));
212 char *fgets __P((char *, int, FILE *));
213 FILE *fopen __P((const char *, const char *));
214 int fprintf __P((FILE *, const char *, ...));
215 int fputc __P((int, FILE *));
216 int fputs __P((const char *, FILE *));
217 size_t fread __P((void *, size_t, size_t, FILE *));
218 FILE *freopen __P((const char *, const char *, FILE *));
219 int fscanf __P((FILE *, const char *, ...));
220 int fseek __P((FILE *, long, int));
221 int fsetpos __P((FILE *, const fpos_t *));
222 long ftell __P((FILE *));
223 size_t fwrite __P((const void *, size_t, size_t, FILE *));
224 int getc __P((FILE *));
225 int getchar __P((void));
226 char *gets __P((char *));
227 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
228 extern __const int sys_nerr; /* perror(3) external variables */
229 extern __const char *__const sys_errlist[];
231 void perror __P((const char *));
232 int printf __P((const char *, ...));
233 int putc __P((int, FILE *));
234 int putchar __P((int));
235 int puts __P((const char *));
236 int remove __P((const char *));
237 int rename __P((const char *, const char *));
238 void rewind __P((FILE *));
239 int scanf __P((const char *, ...));
240 void setbuf __P((FILE *, char *));
241 int setvbuf __P((FILE *, char *, int, size_t));
242 int sprintf __P((char *, const char *, ...));
243 int sscanf __P((const char *, const char *, ...));
244 FILE *tmpfile __P((void));
245 char *tmpnam __P((char *));
246 int ungetc __P((int, FILE *));
247 int vfprintf __P((FILE *, const char *, _BSD_VA_LIST_));
248 int vprintf __P((const char *, _BSD_VA_LIST_));
249 int vsprintf __P((char *, const char *, _BSD_VA_LIST_));
253 * Functions defined in POSIX 1003.1.
256 /* size for cuserid(3); UT_NAMESIZE + 1, see <utmp.h> */
259 #define L_ctermid 1024 /* size for ctermid(3); PATH_MAX */
262 char *ctermid __P((char *));
263 FILE *fdopen __P((int, const char *));
264 int fileno __P((FILE *));
265 int ftrylockfile __P((FILE *));
266 void flockfile __P((FILE *));
267 void funlockfile __P((FILE *));
269 #endif /* not ANSI */
272 * Portability hacks. See <sys/types.h>.
274 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
276 #ifndef _FTRUNCATE_DECLARED
277 #define _FTRUNCATE_DECLARED
278 int ftruncate __P((int, _BSD_OFF_T_));
280 #ifndef _LSEEK_DECLARED
281 #define _LSEEK_DECLARED
282 _BSD_OFF_T_ lseek __P((int, _BSD_OFF_T_, int));
284 #ifndef _MMAP_DECLARED
285 #define _MMAP_DECLARED
286 void *mmap __P((void *, size_t, int, int, int, _BSD_OFF_T_));
288 #ifndef _TRUNCATE_DECLARED
289 #define _TRUNCATE_DECLARED
290 int truncate __P((const char *, _BSD_OFF_T_));
293 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
296 * Routines that are purely local.
298 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
300 int asprintf __P((char **, const char *, ...)) __printflike(2, 3);
301 char *ctermid_r __P((char *));
302 char *fgetln __P((FILE *, size_t *));
303 int fpurge __P((FILE *));
304 int fseeko __P((FILE *, _BSD_OFF_T_, int));
305 _BSD_OFF_T_ ftello __P((FILE *));
306 int getw __P((FILE *));
307 int pclose __P((FILE *));
308 FILE *popen __P((const char *, const char *));
309 int putw __P((int, FILE *));
310 void setbuffer __P((FILE *, char *, int));
311 int setlinebuf __P((FILE *));
312 char *tempnam __P((const char *, const char *));
313 int snprintf __P((char *, size_t, const char *, ...)) __printflike(3, 4);
314 int vasprintf __P((char **, const char *, _BSD_VA_LIST_))
316 int vsnprintf __P((char *, size_t, const char *, _BSD_VA_LIST_))
318 int vscanf __P((const char *, _BSD_VA_LIST_)) __scanflike(1, 0);
319 int vsscanf __P((const char *, const char *, _BSD_VA_LIST_))
324 * This is a #define because the function is used internally and
325 * (unlike vfscanf) the name __vfscanf is guaranteed not to collide
326 * with a user function when _ANSI_SOURCE or _POSIX_SOURCE is defined.
328 #define vfscanf __vfscanf
331 * Stdio function-access interface.
334 FILE *funopen __P((const void *,
335 int (*)(void *, char *, int),
336 int (*)(void *, const char *, int),
337 fpos_t (*)(void *, fpos_t, int),
340 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
341 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
342 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
345 * Functions internal to the implementation.
348 int __srget __P((FILE *));
349 int __vfscanf __P((FILE *, const char *, _BSD_VA_LIST_));
350 int __svfscanf __P((FILE *, const char *, _BSD_VA_LIST_));
351 int __swbuf __P((int, FILE *));
355 * The __sfoo macros are here so that we can
356 * define function versions in the C library.
358 #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++))
359 #if defined(__GNUC__) && defined(__STDC__)
360 static __inline int __sputc(int _c, FILE *_p) {
361 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n'))
362 return (*_p->_p++ = _c);
364 return (__swbuf(_c, _p));
368 * This has been tuned to generate reasonable code on the vax using pcc.
370 #define __sputc(c, p) \
372 (p)->_w >= (p)->_lbfsize ? \
373 (*(p)->_p = (c)), *(p)->_p != '\n' ? \
376 __swbuf((int)(c), p) : \
377 (*(p)->_p = (c), (int)*(p)->_p++))
380 #define __sfeof(p) (((p)->_flags & __SEOF) != 0)
381 #define __sferror(p) (((p)->_flags & __SERR) != 0)
382 #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
383 #define __sfileno(p) ((p)->_file)
386 * See ISO/IEC 9945-1 ANSI/IEEE Std 1003.1 Second Edition 1996-07-12
387 * B.8.2.7 for the rationale behind the *_unlocked() macros.
389 #define feof_unlocked(p) __sfeof(p)
390 #define ferror_unlocked(p) __sferror(p)
391 #define clearerr_unlocked(p) __sclearerr(p)
394 #define fileno_unlocked(p) __sfileno(p)
397 #define getc_unlocked(fp) __sgetc(fp)
398 #define putc_unlocked(x, fp) __sputc(x, fp)
400 #define getchar_unlocked() getc_unlocked(stdin)
401 #define putchar_unlocked(x) putc_unlocked(x, stdout)
403 #endif /* !_STDIO_H_ */