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)(void *);
112 int (*_read)(void *, char *, int);
113 fpos_t (*_seek)(void *, fpos_t, int);
114 int (*_write)(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) */
135 extern FILE *__stdinp;
136 extern FILE *__stdoutp;
137 extern FILE *__stderrp;
140 #define __SLBF 0x0001 /* line buffered */
141 #define __SNBF 0x0002 /* unbuffered */
142 #define __SRD 0x0004 /* OK to read */
143 #define __SWR 0x0008 /* OK to write */
144 /* RD and WR are never simultaneously asserted */
145 #define __SRW 0x0010 /* open for reading & writing */
146 #define __SEOF 0x0020 /* found EOF */
147 #define __SERR 0x0040 /* found error */
148 #define __SMBF 0x0080 /* _buf is from malloc */
149 #define __SAPP 0x0100 /* fdopen()ed in append mode */
150 #define __SSTR 0x0200 /* this is an sprintf/snprintf string */
151 #define __SOPT 0x0400 /* do fseek() optimization */
152 #define __SNPT 0x0800 /* do not do fseek() optimization */
153 #define __SOFF 0x1000 /* set iff _offset is in fact correct */
154 #define __SMOD 0x2000 /* true => fgetln modified _p text */
155 #define __SALC 0x4000 /* allocate string space dynamically */
156 #define __SIGN 0x8000 /* ignore this file in _fwalk */
159 * The following three definitions are for ANSI C, which took them
160 * from System V, which brilliantly took internal interface macros and
161 * made them official arguments to setvbuf(), without renaming them.
162 * Hence, these ugly _IOxxx names are *supposed* to appear in user code.
164 * Although numbered as their counterparts above, the implementation
165 * does not rely on this.
167 #define _IOFBF 0 /* setvbuf should set fully buffered */
168 #define _IOLBF 1 /* setvbuf should set line buffered */
169 #define _IONBF 2 /* setvbuf should set unbuffered */
171 #define BUFSIZ 1024 /* size of buffer used by setbuf */
175 * FOPEN_MAX is a minimum maximum, and is the number of streams that
176 * stdio can provide without attempting to allocate further resources
177 * (which could fail). Do not use this for anything.
179 /* must be == _POSIX_STREAM_MAX <limits.h> */
180 #define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */
181 #define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */
183 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
185 #define P_tmpdir "/var/tmp/"
187 #define L_tmpnam 1024 /* XXX must be == PATH_MAX */
188 #define TMP_MAX 308915776
191 #define SEEK_SET 0 /* set file offset to offset */
194 #define SEEK_CUR 1 /* set file offset to current plus offset */
197 #define SEEK_END 2 /* set file offset to EOF plus offset */
200 /* To be removed by 5.0-RELEASE */
201 #if (defined(__i386__) || defined(__alpha__)) && defined(_OLD_STDIO)
202 #define stdin (&__sF[0])
203 #define stdout (&__sF[1])
204 #define stderr (&__sF[2])
206 #define stdin __stdinp
207 #define stdout __stdoutp
208 #define stderr __stderrp
212 * Functions defined in ANSI C standard.
215 void clearerr(FILE *);
221 int fgetpos(FILE *, fpos_t *);
222 char *fgets(char *, int, FILE *);
223 FILE *fopen(const char *, const char *);
224 int fprintf(FILE *, const char *, ...);
225 int fputc(int, FILE *);
226 int fputs(const char *, FILE *);
227 size_t fread(void *, size_t, size_t, FILE *);
228 FILE *freopen(const char *, const char *, FILE *);
229 int fscanf(FILE *, const char *, ...);
230 int fseek(FILE *, long, int);
231 int fsetpos(FILE *, const fpos_t *);
233 size_t fwrite(const void *, size_t, size_t, FILE *);
237 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
238 extern __const int sys_nerr; /* perror(3) external variables */
239 extern __const char *__const sys_errlist[];
241 void perror(const char *);
242 int printf(const char *, ...);
243 int putc(int, FILE *);
245 int puts(const char *);
246 int remove(const char *);
247 int rename(const char *, const char *);
249 int scanf(const char *, ...);
250 void setbuf(FILE *, char *);
251 int setvbuf(FILE *, char *, int, size_t);
252 int sprintf(char *, const char *, ...);
253 int sscanf(const char *, const char *, ...);
255 char *tmpnam(char *);
256 int ungetc(int, FILE *);
257 int vfprintf(FILE *, const char *, _BSD_VA_LIST_);
258 int vprintf(const char *, _BSD_VA_LIST_);
259 int vsprintf(char *, const char *, _BSD_VA_LIST_);
263 * Functions defined in POSIX 1003.1.
266 /* size for cuserid(3); UT_NAMESIZE + 1, see <utmp.h> */
269 #define L_ctermid 1024 /* size for ctermid(3); PATH_MAX */
272 char *ctermid(char *);
273 FILE *fdopen(int, const char *);
275 int ftrylockfile(FILE *);
276 void flockfile(FILE *);
277 void funlockfile(FILE *);
279 #endif /* not ANSI */
282 * Portability hacks. See <sys/types.h>.
284 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
286 #ifndef _FTRUNCATE_DECLARED
287 #define _FTRUNCATE_DECLARED
288 int ftruncate(int, _BSD_OFF_T_);
290 #ifndef _LSEEK_DECLARED
291 #define _LSEEK_DECLARED
292 _BSD_OFF_T_ lseek(int, _BSD_OFF_T_, int);
294 #ifndef _MMAP_DECLARED
295 #define _MMAP_DECLARED
296 void *mmap(void *, size_t, int, int, int, _BSD_OFF_T_);
298 #ifndef _TRUNCATE_DECLARED
299 #define _TRUNCATE_DECLARED
300 int truncate(const char *, _BSD_OFF_T_);
303 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
306 * Routines that are purely local.
308 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
310 int asprintf(char **, const char *, ...) __printflike(2, 3);
311 char *ctermid_r(char *);
312 char *fgetln(FILE *, size_t *);
313 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ >= 3
314 #define __ATTR_FORMAT_ARG __attribute__((__format_arg__(2)))
316 #define __ATTR_FORMAT_ARG
318 __const char *fmtcheck(const char *, const char *) __ATTR_FORMAT_ARG;
320 int fseeko(FILE *, _BSD_OFF_T_, int);
321 _BSD_OFF_T_ ftello(FILE *);
324 FILE *popen(const char *, const char *);
325 int putw(int, FILE *);
326 void setbuffer(FILE *, char *, int);
327 int setlinebuf(FILE *);
328 char *tempnam(const char *, const char *);
329 int snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
330 int vasprintf(char **, const char *, _BSD_VA_LIST_)
332 int vsnprintf(char *, size_t, const char *, _BSD_VA_LIST_)
334 int vscanf(const char *, _BSD_VA_LIST_) __scanflike(1, 0);
335 int vsscanf(const char *, const char *, _BSD_VA_LIST_)
340 * This is a #define because the function is used internally and
341 * (unlike vfscanf) the name __vfscanf is guaranteed not to collide
342 * with a user function when _ANSI_SOURCE or _POSIX_SOURCE is defined.
344 #define vfscanf __vfscanf
347 * Stdio function-access interface.
350 FILE *funopen(const void *,
351 int (*)(void *, char *, int),
352 int (*)(void *, const char *, int),
353 fpos_t (*)(void *, fpos_t, int),
356 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
357 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
358 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
361 * Functions internal to the implementation.
365 int __vfscanf(FILE *, const char *, _BSD_VA_LIST_);
366 int __svfscanf(FILE *, const char *, _BSD_VA_LIST_);
367 int __swbuf(int, FILE *);
371 * The __sfoo macros are here so that we can
372 * define function versions in the C library.
374 #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++))
375 #if defined(__GNUC__) && defined(__STDC__)
376 static __inline int __sputc(int _c, FILE *_p) {
377 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n'))
378 return (*_p->_p++ = _c);
380 return (__swbuf(_c, _p));
384 * This has been tuned to generate reasonable code on the vax using pcc.
386 #define __sputc(c, p) \
388 (p)->_w >= (p)->_lbfsize ? \
389 (*(p)->_p = (c)), *(p)->_p != '\n' ? \
392 __swbuf((int)(c), p) : \
393 (*(p)->_p = (c), (int)*(p)->_p++))
396 #define __sfeof(p) (((p)->_flags & __SEOF) != 0)
397 #define __sferror(p) (((p)->_flags & __SERR) != 0)
398 #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
399 #define __sfileno(p) ((p)->_file)
402 * See ISO/IEC 9945-1 ANSI/IEEE Std 1003.1 Second Edition 1996-07-12
403 * B.8.2.7 for the rationale behind the *_unlocked() macros.
405 #define feof_unlocked(p) __sfeof(p)
406 #define ferror_unlocked(p) __sferror(p)
407 #define clearerr_unlocked(p) __sclearerr(p)
410 #define fileno_unlocked(p) __sfileno(p)
413 #define getc_unlocked(fp) __sgetc(fp)
414 #define putc_unlocked(x, fp) __sputc(x, fp)
416 #define getchar_unlocked() getc_unlocked(stdin)
417 #define putchar_unlocked(x) putc_unlocked(x, stdout)
419 #endif /* !_STDIO_H_ */