stdio.h revision 83712
1214571Sdim/*- 2214571Sdim * Copyright (c) 1990, 1993 3214571Sdim * The Regents of the University of California. All rights reserved. 4214571Sdim * 5214571Sdim * This code is derived from software contributed to Berkeley by 6214571Sdim * Chris Torek. 7214571Sdim * 8214571Sdim * Redistribution and use in source and binary forms, with or without 9214571Sdim * modification, are permitted provided that the following conditions 10214571Sdim * are met: 11214571Sdim * 1. Redistributions of source code must retain the above copyright 12214571Sdim * notice, this list of conditions and the following disclaimer. 13214571Sdim * 2. Redistributions in binary form must reproduce the above copyright 14214571Sdim * notice, this list of conditions and the following disclaimer in the 15214571Sdim * documentation and/or other materials provided with the distribution. 16214571Sdim * 3. All advertising materials mentioning features or use of this software 17214571Sdim * must display the following acknowledgement: 18214571Sdim * This product includes software developed by the University of 19214571Sdim * California, Berkeley and its contributors. 20214571Sdim * 4. Neither the name of the University nor the names of its contributors 21214571Sdim * may be used to endorse or promote products derived from this software 22214571Sdim * without specific prior written permission. 23214571Sdim * 24214571Sdim * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25214571Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26214571Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27214571Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28214571Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29214571Sdim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30214571Sdim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31214571Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32214571Sdim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33214571Sdim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34214571Sdim * SUCH DAMAGE. 35214571Sdim * 36214571Sdim * @(#)stdio.h 8.5 (Berkeley) 4/29/95 37214571Sdim * $FreeBSD: head/include/stdio.h 83712 2001-09-20 08:47:41Z peter $ 38214571Sdim */ 39214571Sdim 40214571Sdim#ifndef _STDIO_H_ 41214571Sdim#define _STDIO_H_ 42214571Sdim 43214571Sdim#include <sys/cdefs.h> 44214571Sdim#include <machine/ansi.h> 45214571Sdim 46214571Sdim#ifdef _BSD_SIZE_T_ 47214571Sdimtypedef _BSD_SIZE_T_ size_t; 48214571Sdim#undef _BSD_SIZE_T_ 49214571Sdim#endif 50214571Sdim 51214571Sdim#ifndef NULL 52214571Sdim#define NULL 0 53214571Sdim#endif 54214571Sdim 55214571Sdimtypedef _BSD_OFF_T_ fpos_t; 56214571Sdim 57214571Sdim#define _FSTDIO /* Define for new stdio with functions. */ 58214571Sdim 59214571Sdim/* 60214571Sdim * NB: to fit things in six character monocase externals, the stdio 61214571Sdim * code uses the prefix `__s' for stdio objects, typically followed 62214571Sdim * by a three-character attempt at a mnemonic. 63214571Sdim */ 64214571Sdim 65214571Sdim/* stdio buffers */ 66214571Sdimstruct __sbuf { 67214571Sdim unsigned char *_base; 68214571Sdim int _size; 69214571Sdim}; 70214571Sdim 71214571Sdim/* hold a buncha junk that would grow the ABI */ 72214571Sdimstruct __sFILEX; 73214571Sdim 74214571Sdim/* 75214571Sdim * stdio state variables. 76214571Sdim * 77214571Sdim * The following always hold: 78214571Sdim * 79214571Sdim * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR), 80214571Sdim * _lbfsize is -_bf._size, else _lbfsize is 0 81214571Sdim * if _flags&__SRD, _w is 0 82214571Sdim * if _flags&__SWR, _r is 0 83214571Sdim * 84214571Sdim * This ensures that the getc and putc macros (or inline functions) never 85214571Sdim * try to write or read from a file that is in `read' or `write' mode. 86214571Sdim * (Moreover, they can, and do, automatically switch from read mode to 87214571Sdim * write mode, and back, on "r+" and "w+" files.) 88214571Sdim * 89214571Sdim * _lbfsize is used only to make the inline line-buffered output stream 90214571Sdim * code as compact as possible. 91214571Sdim * 92214571Sdim * _ub, _up, and _ur are used when ungetc() pushes back more characters 93214571Sdim * than fit in the current _bf, or when ungetc() pushes back a character 94214571Sdim * that does not match the previous one in _bf. When this happens, 95214571Sdim * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff 96214571Sdim * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. 97214571Sdim * 98214571Sdim * NB: see WARNING above before changing the layout of this structure! 99214571Sdim */ 100214571Sdimtypedef struct __sFILE { 101214571Sdim unsigned char *_p; /* current position in (some) buffer */ 102214571Sdim int _r; /* read space left for getc() */ 103214571Sdim int _w; /* write space left for putc() */ 104214571Sdim short _flags; /* flags, below; this FILE is free if 0 */ 105214571Sdim short _file; /* fileno, if Unix descriptor, else -1 */ 106214571Sdim struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ 107214571Sdim int _lbfsize; /* 0 or -_bf._size, for inline putc */ 108 109 /* operations */ 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)); 115 116 /* 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 */ 120 121 /* 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 */ 124 125 /* separate buffer for fgetln() when line crosses buffer boundary */ 126 struct __sbuf _lb; /* buffer for fgetln() */ 127 128 /* 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) */ 131} FILE; 132 133__BEGIN_DECLS 134extern FILE __sF[]; 135extern FILE *__stdinp; 136extern FILE *__stdoutp; 137extern FILE *__stderrp; 138__END_DECLS 139 140#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 */ 157 158/* 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. 163 * 164 * Although numbered as their counterparts above, the implementation 165 * does not rely on this. 166 */ 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 */ 170 171#define BUFSIZ 1024 /* size of buffer used by setbuf */ 172#define EOF (-1) 173 174/* 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. 178 */ 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> */ 182 183/* System V/ANSI C; this is the wrong way to do this, do *not* use these. */ 184#ifndef _ANSI_SOURCE 185#define P_tmpdir "/var/tmp/" 186#endif 187#define L_tmpnam 1024 /* XXX must be == PATH_MAX */ 188#define TMP_MAX 308915776 189 190#ifndef SEEK_SET 191#define SEEK_SET 0 /* set file offset to offset */ 192#endif 193#ifndef SEEK_CUR 194#define SEEK_CUR 1 /* set file offset to current plus offset */ 195#endif 196#ifndef SEEK_END 197#define SEEK_END 2 /* set file offset to EOF plus offset */ 198#endif 199 200/* 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]) 205#else 206#define stdin __stdinp 207#define stdout __stdoutp 208#define stderr __stderrp 209#endif 210 211/* 212 * Functions defined in ANSI C standard. 213 */ 214__BEGIN_DECLS 215void clearerr __P((FILE *)); 216int fclose __P((FILE *)); 217int feof __P((FILE *)); 218int ferror __P((FILE *)); 219int fflush __P((FILE *)); 220int fgetc __P((FILE *)); 221int fgetpos __P((FILE *, fpos_t *)); 222char *fgets __P((char *, int, FILE *)); 223FILE *fopen __P((const char *, const char *)); 224int fprintf __P((FILE *, const char *, ...)); 225int fputc __P((int, FILE *)); 226int fputs __P((const char *, FILE *)); 227size_t fread __P((void *, size_t, size_t, FILE *)); 228FILE *freopen __P((const char *, const char *, FILE *)); 229int fscanf __P((FILE *, const char *, ...)); 230int fseek __P((FILE *, long, int)); 231int fsetpos __P((FILE *, const fpos_t *)); 232long ftell __P((FILE *)); 233size_t fwrite __P((const void *, size_t, size_t, FILE *)); 234int getc __P((FILE *)); 235int getchar __P((void)); 236char *gets __P((char *)); 237#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 238extern __const int sys_nerr; /* perror(3) external variables */ 239extern __const char *__const sys_errlist[]; 240#endif 241void perror __P((const char *)); 242int printf __P((const char *, ...)); 243int putc __P((int, FILE *)); 244int putchar __P((int)); 245int puts __P((const char *)); 246int remove __P((const char *)); 247int rename __P((const char *, const char *)); 248void rewind __P((FILE *)); 249int scanf __P((const char *, ...)); 250void setbuf __P((FILE *, char *)); 251int setvbuf __P((FILE *, char *, int, size_t)); 252int sprintf __P((char *, const char *, ...)); 253int sscanf __P((const char *, const char *, ...)); 254FILE *tmpfile __P((void)); 255char *tmpnam __P((char *)); 256int ungetc __P((int, FILE *)); 257int vfprintf __P((FILE *, const char *, _BSD_VA_LIST_)); 258int vprintf __P((const char *, _BSD_VA_LIST_)); 259int vsprintf __P((char *, const char *, _BSD_VA_LIST_)); 260__END_DECLS 261 262/* 263 * Functions defined in POSIX 1003.1. 264 */ 265#ifndef _ANSI_SOURCE 266/* size for cuserid(3); UT_NAMESIZE + 1, see <utmp.h> */ 267#define L_cuserid 17 268 269#define L_ctermid 1024 /* size for ctermid(3); PATH_MAX */ 270 271__BEGIN_DECLS 272char *ctermid __P((char *)); 273FILE *fdopen __P((int, const char *)); 274int fileno __P((FILE *)); 275int ftrylockfile __P((FILE *)); 276void flockfile __P((FILE *)); 277void funlockfile __P((FILE *)); 278__END_DECLS 279#endif /* not ANSI */ 280 281/* 282 * Portability hacks. See <sys/types.h>. 283 */ 284#if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 285__BEGIN_DECLS 286#ifndef _FTRUNCATE_DECLARED 287#define _FTRUNCATE_DECLARED 288int ftruncate __P((int, _BSD_OFF_T_)); 289#endif 290#ifndef _LSEEK_DECLARED 291#define _LSEEK_DECLARED 292_BSD_OFF_T_ lseek __P((int, _BSD_OFF_T_, int)); 293#endif 294#ifndef _MMAP_DECLARED 295#define _MMAP_DECLARED 296void *mmap __P((void *, size_t, int, int, int, _BSD_OFF_T_)); 297#endif 298#ifndef _TRUNCATE_DECLARED 299#define _TRUNCATE_DECLARED 300int truncate __P((const char *, _BSD_OFF_T_)); 301#endif 302__END_DECLS 303#endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */ 304 305/* 306 * Routines that are purely local. 307 */ 308#if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 309__BEGIN_DECLS 310int asprintf __P((char **, const char *, ...)) __printflike(2, 3); 311char *ctermid_r __P((char *)); 312__const char *fmtcheck __P((const char *, const char *)) 313 __attribute__((__format_arg__(2))); 314char *fgetln __P((FILE *, size_t *)); 315int fpurge __P((FILE *)); 316int fseeko __P((FILE *, _BSD_OFF_T_, int)); 317_BSD_OFF_T_ ftello __P((FILE *)); 318int getw __P((FILE *)); 319int pclose __P((FILE *)); 320FILE *popen __P((const char *, const char *)); 321int putw __P((int, FILE *)); 322void setbuffer __P((FILE *, char *, int)); 323int setlinebuf __P((FILE *)); 324char *tempnam __P((const char *, const char *)); 325int snprintf __P((char *, size_t, const char *, ...)) __printflike(3, 4); 326int vasprintf __P((char **, const char *, _BSD_VA_LIST_)) 327 __printflike(2, 0); 328int vsnprintf __P((char *, size_t, const char *, _BSD_VA_LIST_)) 329 __printflike(3, 0); 330int vscanf __P((const char *, _BSD_VA_LIST_)) __scanflike(1, 0); 331int vsscanf __P((const char *, const char *, _BSD_VA_LIST_)) 332 __scanflike(2, 0); 333__END_DECLS 334 335/* 336 * This is a #define because the function is used internally and 337 * (unlike vfscanf) the name __vfscanf is guaranteed not to collide 338 * with a user function when _ANSI_SOURCE or _POSIX_SOURCE is defined. 339 */ 340#define vfscanf __vfscanf 341 342/* 343 * Stdio function-access interface. 344 */ 345__BEGIN_DECLS 346FILE *funopen __P((const void *, 347 int (*)(void *, char *, int), 348 int (*)(void *, const char *, int), 349 fpos_t (*)(void *, fpos_t, int), 350 int (*)(void *))); 351__END_DECLS 352#define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0) 353#define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0) 354#endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */ 355 356/* 357 * Functions internal to the implementation. 358 */ 359__BEGIN_DECLS 360int __srget __P((FILE *)); 361int __vfscanf __P((FILE *, const char *, _BSD_VA_LIST_)); 362int __svfscanf __P((FILE *, const char *, _BSD_VA_LIST_)); 363int __swbuf __P((int, FILE *)); 364__END_DECLS 365 366/* 367 * The __sfoo macros are here so that we can 368 * define function versions in the C library. 369 */ 370#define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++)) 371#if defined(__GNUC__) && defined(__STDC__) 372static __inline int __sputc(int _c, FILE *_p) { 373 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n')) 374 return (*_p->_p++ = _c); 375 else 376 return (__swbuf(_c, _p)); 377} 378#else 379/* 380 * This has been tuned to generate reasonable code on the vax using pcc. 381 */ 382#define __sputc(c, p) \ 383 (--(p)->_w < 0 ? \ 384 (p)->_w >= (p)->_lbfsize ? \ 385 (*(p)->_p = (c)), *(p)->_p != '\n' ? \ 386 (int)*(p)->_p++ : \ 387 __swbuf('\n', p) : \ 388 __swbuf((int)(c), p) : \ 389 (*(p)->_p = (c), (int)*(p)->_p++)) 390#endif 391 392#define __sfeof(p) (((p)->_flags & __SEOF) != 0) 393#define __sferror(p) (((p)->_flags & __SERR) != 0) 394#define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF))) 395#define __sfileno(p) ((p)->_file) 396 397/* 398 * See ISO/IEC 9945-1 ANSI/IEEE Std 1003.1 Second Edition 1996-07-12 399 * B.8.2.7 for the rationale behind the *_unlocked() macros. 400 */ 401#define feof_unlocked(p) __sfeof(p) 402#define ferror_unlocked(p) __sferror(p) 403#define clearerr_unlocked(p) __sclearerr(p) 404 405#ifndef _ANSI_SOURCE 406#define fileno_unlocked(p) __sfileno(p) 407#endif 408 409#define getc_unlocked(fp) __sgetc(fp) 410#define putc_unlocked(x, fp) __sputc(x, fp) 411 412#define getchar_unlocked() getc_unlocked(stdin) 413#define putchar_unlocked(x) putc_unlocked(x, stdout) 414 415#endif /* !_STDIO_H_ */ 416