stdio.h revision 203964
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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)stdio.h 8.5 (Berkeley) 4/29/95 33 * $FreeBSD: head/include/stdio.h 203964 2010-02-16 19:39:50Z imp $ 34 */ 35 36#ifndef _STDIO_H_ 37#define _STDIO_H_ 38 39#include <sys/cdefs.h> 40#include <sys/_null.h> 41#include <sys/_types.h> 42 43typedef __off_t fpos_t; 44 45#ifndef _SIZE_T_DECLARED 46typedef __size_t size_t; 47#define _SIZE_T_DECLARED 48#endif 49 50#if __BSD_VISIBLE || __POSIX_VISIBLE >= 200809 51#ifndef _OFF_T_DECLARED 52#define _OFF_T_DECLARED 53typedef __off_t off_t; 54#endif 55#ifndef _SSIZE_T_DECLARED 56#define _SSIZE_T_DECLARED 57typedef __ssize_t ssize_t; 58#endif 59#endif 60 61#if __BSD_VISIBLE || __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 62#ifndef _VA_LIST_DECLARED 63typedef __va_list va_list; 64#define _VA_LIST_DECLARED 65#endif 66#endif 67 68#define _FSTDIO /* Define for new stdio with functions. */ 69 70/* 71 * NB: to fit things in six character monocase externals, the stdio 72 * code uses the prefix `__s' for stdio objects, typically followed 73 * by a three-character attempt at a mnemonic. 74 */ 75 76/* stdio buffers */ 77struct __sbuf { 78 unsigned char *_base; 79 int _size; 80}; 81 82/* 83 * stdio state variables. 84 * 85 * The following always hold: 86 * 87 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR), 88 * _lbfsize is -_bf._size, else _lbfsize is 0 89 * if _flags&__SRD, _w is 0 90 * if _flags&__SWR, _r is 0 91 * 92 * This ensures that the getc and putc macros (or inline functions) never 93 * try to write or read from a file that is in `read' or `write' mode. 94 * (Moreover, they can, and do, automatically switch from read mode to 95 * write mode, and back, on "r+" and "w+" files.) 96 * 97 * _lbfsize is used only to make the inline line-buffered output stream 98 * code as compact as possible. 99 * 100 * _ub, _up, and _ur are used when ungetc() pushes back more characters 101 * than fit in the current _bf, or when ungetc() pushes back a character 102 * that does not match the previous one in _bf. When this happens, 103 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff 104 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. 105 * 106 * Certain members of __sFILE are accessed directly via macros or 107 * inline functions. To preserve ABI compat, these members must not 108 * be disturbed. These members are marked below with (*). 109 */ 110typedef struct __sFILE { 111 unsigned char *_p; /* (*) current position in (some) buffer */ 112 int _r; /* (*) read space left for getc() */ 113 int _w; /* (*) write space left for putc() */ 114 short _flags; /* (*) flags, below; this FILE is free if 0 */ 115 short _file; /* (*) fileno, if Unix descriptor, else -1 */ 116 struct __sbuf _bf; /* (*) the buffer (at least 1 byte, if !NULL) */ 117 int _lbfsize; /* (*) 0 or -_bf._size, for inline putc */ 118 119 /* operations */ 120 void *_cookie; /* (*) cookie passed to io functions */ 121 int (*_close)(void *); 122 int (*_read)(void *, char *, int); 123 fpos_t (*_seek)(void *, fpos_t, int); 124 int (*_write)(void *, const char *, int); 125 126 /* separate buffer for long sequences of ungetc() */ 127 struct __sbuf _ub; /* ungetc buffer */ 128 unsigned char *_up; /* saved _p when _p is doing ungetc data */ 129 int _ur; /* saved _r when _r is counting ungetc data */ 130 131 /* tricks to meet minimum requirements even when malloc() fails */ 132 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ 133 unsigned char _nbuf[1]; /* guarantee a getc() buffer */ 134 135 /* separate buffer for fgetln() when line crosses buffer boundary */ 136 struct __sbuf _lb; /* buffer for fgetln() */ 137 138 /* Unix stdio files get aligned to block boundaries on fseek() */ 139 int _blksize; /* stat.st_blksize (may be != _bf._size) */ 140 fpos_t _offset; /* current lseek offset */ 141 142 struct pthread_mutex *_fl_mutex; /* used for MT-safety */ 143 struct pthread *_fl_owner; /* current owner */ 144 int _fl_count; /* recursive lock count */ 145 int _orientation; /* orientation for fwide() */ 146 __mbstate_t _mbstate; /* multibyte conversion state */ 147} FILE; 148 149#ifndef _STDSTREAM_DECLARED 150__BEGIN_DECLS 151extern FILE *__stdinp; 152extern FILE *__stdoutp; 153extern FILE *__stderrp; 154__END_DECLS 155#define _STDSTREAM_DECLARED 156#endif 157 158#define __SLBF 0x0001 /* line buffered */ 159#define __SNBF 0x0002 /* unbuffered */ 160#define __SRD 0x0004 /* OK to read */ 161#define __SWR 0x0008 /* OK to write */ 162 /* RD and WR are never simultaneously asserted */ 163#define __SRW 0x0010 /* open for reading & writing */ 164#define __SEOF 0x0020 /* found EOF */ 165#define __SERR 0x0040 /* found error */ 166#define __SMBF 0x0080 /* _buf is from malloc */ 167#define __SAPP 0x0100 /* fdopen()ed in append mode */ 168#define __SSTR 0x0200 /* this is an sprintf/snprintf string */ 169#define __SOPT 0x0400 /* do fseek() optimization */ 170#define __SNPT 0x0800 /* do not do fseek() optimization */ 171#define __SOFF 0x1000 /* set iff _offset is in fact correct */ 172#define __SMOD 0x2000 /* true => fgetln modified _p text */ 173#define __SALC 0x4000 /* allocate string space dynamically */ 174#define __SIGN 0x8000 /* ignore this file in _fwalk */ 175 176/* 177 * The following three definitions are for ANSI C, which took them 178 * from System V, which brilliantly took internal interface macros and 179 * made them official arguments to setvbuf(), without renaming them. 180 * Hence, these ugly _IOxxx names are *supposed* to appear in user code. 181 * 182 * Although numbered as their counterparts above, the implementation 183 * does not rely on this. 184 */ 185#define _IOFBF 0 /* setvbuf should set fully buffered */ 186#define _IOLBF 1 /* setvbuf should set line buffered */ 187#define _IONBF 2 /* setvbuf should set unbuffered */ 188 189#define BUFSIZ 1024 /* size of buffer used by setbuf */ 190#define EOF (-1) 191 192/* 193 * FOPEN_MAX is a minimum maximum, and is the number of streams that 194 * stdio can provide without attempting to allocate further resources 195 * (which could fail). Do not use this for anything. 196 */ 197 /* must be == _POSIX_STREAM_MAX <limits.h> */ 198#ifndef FOPEN_MAX 199#define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */ 200#endif 201#define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */ 202 203/* System V/ANSI C; this is the wrong way to do this, do *not* use these. */ 204#if __XSI_VISIBLE 205#define P_tmpdir "/var/tmp/" 206#endif 207#define L_tmpnam 1024 /* XXX must be == PATH_MAX */ 208#define TMP_MAX 308915776 209 210#ifndef SEEK_SET 211#define SEEK_SET 0 /* set file offset to offset */ 212#endif 213#ifndef SEEK_CUR 214#define SEEK_CUR 1 /* set file offset to current plus offset */ 215#endif 216#ifndef SEEK_END 217#define SEEK_END 2 /* set file offset to EOF plus offset */ 218#endif 219 220#define stdin __stdinp 221#define stdout __stdoutp 222#define stderr __stderrp 223 224__BEGIN_DECLS 225/* 226 * Functions defined in ANSI C standard. 227 */ 228void clearerr(FILE *); 229int fclose(FILE *); 230int feof(FILE *); 231int ferror(FILE *); 232int fflush(FILE *); 233int fgetc(FILE *); 234int fgetpos(FILE * __restrict, fpos_t * __restrict); 235char *fgets(char * __restrict, int, FILE * __restrict); 236FILE *fopen(const char * __restrict, const char * __restrict); 237int fprintf(FILE * __restrict, const char * __restrict, ...); 238int fputc(int, FILE *); 239int fputs(const char * __restrict, FILE * __restrict); 240size_t fread(void * __restrict, size_t, size_t, FILE * __restrict); 241FILE *freopen(const char * __restrict, const char * __restrict, FILE * __restrict); 242int fscanf(FILE * __restrict, const char * __restrict, ...); 243int fseek(FILE *, long, int); 244int fsetpos(FILE *, const fpos_t *); 245long ftell(FILE *); 246size_t fwrite(const void * __restrict, size_t, size_t, FILE * __restrict); 247int getc(FILE *); 248int getchar(void); 249char *gets(char *); 250void perror(const char *); 251int printf(const char * __restrict, ...); 252int putc(int, FILE *); 253int putchar(int); 254int puts(const char *); 255int remove(const char *); 256int rename(const char *, const char *); 257void rewind(FILE *); 258int scanf(const char * __restrict, ...); 259void setbuf(FILE * __restrict, char * __restrict); 260int setvbuf(FILE * __restrict, char * __restrict, int, size_t); 261int sprintf(char * __restrict, const char * __restrict, ...); 262int sscanf(const char * __restrict, const char * __restrict, ...); 263FILE *tmpfile(void); 264char *tmpnam(char *); 265int ungetc(int, FILE *); 266int vfprintf(FILE * __restrict, const char * __restrict, 267 __va_list); 268int vprintf(const char * __restrict, __va_list); 269int vsprintf(char * __restrict, const char * __restrict, 270 __va_list); 271 272#if __ISO_C_VISIBLE >= 1999 273int snprintf(char * __restrict, size_t, const char * __restrict, 274 ...) __printflike(3, 4); 275int vfscanf(FILE * __restrict, const char * __restrict, __va_list) 276 __scanflike(2, 0); 277int vscanf(const char * __restrict, __va_list) __scanflike(1, 0); 278int vsnprintf(char * __restrict, size_t, const char * __restrict, 279 __va_list) __printflike(3, 0); 280int vsscanf(const char * __restrict, const char * __restrict, __va_list) 281 __scanflike(2, 0); 282#endif 283 284/* 285 * Functions defined in all versions of POSIX 1003.1. 286 */ 287#if __BSD_VISIBLE || __POSIX_VISIBLE <= 199506 288/* size for cuserid(3); UT_NAMESIZE + 1, see <utmp.h> */ 289#define L_cuserid 17 /* legacy */ 290#endif 291 292#if __POSIX_VISIBLE 293#define L_ctermid 1024 /* size for ctermid(3); PATH_MAX */ 294 295char *ctermid(char *); 296FILE *fdopen(int, const char *); 297int fileno(FILE *); 298#endif /* __POSIX_VISIBLE */ 299 300#if __POSIX_VISIBLE >= 199209 301int pclose(FILE *); 302FILE *popen(const char *, const char *); 303#endif 304 305#if __POSIX_VISIBLE >= 199506 306int ftrylockfile(FILE *); 307void flockfile(FILE *); 308void funlockfile(FILE *); 309 310/* 311 * These are normally used through macros as defined below, but POSIX 312 * requires functions as well. 313 */ 314int getc_unlocked(FILE *); 315int getchar_unlocked(void); 316int putc_unlocked(int, FILE *); 317int putchar_unlocked(int); 318#endif 319#if __BSD_VISIBLE 320void clearerr_unlocked(FILE *); 321int feof_unlocked(FILE *); 322int ferror_unlocked(FILE *); 323int fileno_unlocked(FILE *); 324#endif 325 326#if __POSIX_VISIBLE >= 200112 327int fseeko(FILE *, __off_t, int); 328__off_t ftello(FILE *); 329#endif 330 331#if __BSD_VISIBLE || __XSI_VISIBLE > 0 && __XSI_VISIBLE < 600 332int getw(FILE *); 333int putw(int, FILE *); 334#endif /* BSD or X/Open before issue 6 */ 335 336#if __XSI_VISIBLE 337char *tempnam(const char *, const char *); 338#endif 339 340#if __BSD_VISIBLE || __POSIX_VISIBLE >= 200809 341ssize_t getdelim(char ** __restrict, size_t * __restrict, int, 342 FILE * __restrict); 343int renameat(int, const char *, int, const char *); 344int vdprintf(int, const char * __restrict, __va_list); 345 346/* 347 * Every programmer and his dog wrote functions called getline() and dprintf() 348 * before POSIX.1-2008 came along and decided to usurp the names, so we 349 * don't prototype them by default unless one of the following is true: 350 * a) the app has requested them specifically by defining _WITH_GETLINE or 351 * _WITH_DPRINTF, respectively 352 * b) the app has requested a POSIX.1-2008 environment via _POSIX_C_SOURCE 353 * c) the app defines a GNUism such as _BSD_SOURCE or _GNU_SOURCE 354 */ 355#ifndef _WITH_GETLINE 356#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE) 357#define _WITH_GETLINE 358#elif defined(_POSIX_C_SOURCE) 359#if _POSIX_C_SOURCE >= 200809 360#define _WITH_GETLINE 361#endif 362#endif 363#endif 364 365#ifdef _WITH_GETLINE 366ssize_t getline(char ** __restrict, size_t * __restrict, FILE * __restrict); 367#endif 368 369#ifndef _WITH_DPRINTF 370#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE) 371#define _WITH_DPRINTF 372#elif defined(_POSIX_C_SOURCE) 373#if _POSIX_C_SOURCE >= 200809 374#define _WITH_DPRINTF 375#endif 376#endif 377#endif 378 379#ifdef _WITH_DPRINTF 380int (dprintf)(int, const char * __restrict, ...); 381#endif 382 383#endif /* __BSD_VISIBLE || __POSIX_VISIBLE >= 200809 */ 384 385/* 386 * Routines that are purely local. 387 */ 388#if __BSD_VISIBLE 389int asprintf(char **, const char *, ...) __printflike(2, 3); 390char *ctermid_r(char *); 391void fcloseall(void); 392char *fgetln(FILE *, size_t *); 393const char *fmtcheck(const char *, const char *) __format_arg(2); 394int fpurge(FILE *); 395void setbuffer(FILE *, char *, int); 396int setlinebuf(FILE *); 397int vasprintf(char **, const char *, __va_list) 398 __printflike(2, 0); 399 400/* 401 * The system error table contains messages for the first sys_nerr 402 * positive errno values. Use strerror() or strerror_r() from <string.h> 403 * instead. 404 */ 405extern __const int sys_nerr; 406extern __const char *__const sys_errlist[]; 407 408/* 409 * Stdio function-access interface. 410 */ 411FILE *funopen(const void *, 412 int (*)(void *, char *, int), 413 int (*)(void *, const char *, int), 414 fpos_t (*)(void *, fpos_t, int), 415 int (*)(void *)); 416#define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0) 417#define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0) 418 419/* 420 * Portability hacks. See <sys/types.h>. 421 */ 422#ifndef _FTRUNCATE_DECLARED 423#define _FTRUNCATE_DECLARED 424int ftruncate(int, __off_t); 425#endif 426#ifndef _LSEEK_DECLARED 427#define _LSEEK_DECLARED 428__off_t lseek(int, __off_t, int); 429#endif 430#ifndef _MMAP_DECLARED 431#define _MMAP_DECLARED 432void *mmap(void *, size_t, int, int, int, __off_t); 433#endif 434#ifndef _TRUNCATE_DECLARED 435#define _TRUNCATE_DECLARED 436int truncate(const char *, __off_t); 437#endif 438#endif /* __BSD_VISIBLE */ 439 440/* 441 * Functions internal to the implementation. 442 */ 443int __srget(FILE *); 444int __swbuf(int, FILE *); 445 446/* 447 * The __sfoo macros are here so that we can 448 * define function versions in the C library. 449 */ 450#define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++)) 451#if defined(__GNUC__) && defined(__STDC__) 452static __inline int __sputc(int _c, FILE *_p) { 453 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n')) 454 return (*_p->_p++ = _c); 455 else 456 return (__swbuf(_c, _p)); 457} 458#else 459/* 460 * This has been tuned to generate reasonable code on the vax using pcc. 461 */ 462#define __sputc(c, p) \ 463 (--(p)->_w < 0 ? \ 464 (p)->_w >= (p)->_lbfsize ? \ 465 (*(p)->_p = (c)), *(p)->_p != '\n' ? \ 466 (int)*(p)->_p++ : \ 467 __swbuf('\n', p) : \ 468 __swbuf((int)(c), p) : \ 469 (*(p)->_p = (c), (int)*(p)->_p++)) 470#endif 471 472#define __sfeof(p) (((p)->_flags & __SEOF) != 0) 473#define __sferror(p) (((p)->_flags & __SERR) != 0) 474#define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF))) 475#define __sfileno(p) ((p)->_file) 476 477extern int __isthreaded; 478 479#define feof(p) (!__isthreaded ? __sfeof(p) : (feof)(p)) 480#define ferror(p) (!__isthreaded ? __sferror(p) : (ferror)(p)) 481#define clearerr(p) (!__isthreaded ? __sclearerr(p) : (clearerr)(p)) 482 483#if __POSIX_VISIBLE 484#define fileno(p) (!__isthreaded ? __sfileno(p) : (fileno)(p)) 485#endif 486 487#define getc(fp) (!__isthreaded ? __sgetc(fp) : (getc)(fp)) 488#define putc(x, fp) (!__isthreaded ? __sputc(x, fp) : (putc)(x, fp)) 489 490#define getchar() getc(stdin) 491#define putchar(x) putc(x, stdout) 492 493#if __BSD_VISIBLE 494/* 495 * See ISO/IEC 9945-1 ANSI/IEEE Std 1003.1 Second Edition 1996-07-12 496 * B.8.2.7 for the rationale behind the *_unlocked() macros. 497 */ 498#define feof_unlocked(p) __sfeof(p) 499#define ferror_unlocked(p) __sferror(p) 500#define clearerr_unlocked(p) __sclearerr(p) 501#define fileno_unlocked(p) __sfileno(p) 502#endif 503#if __POSIX_VISIBLE >= 199506 504#define getc_unlocked(fp) __sgetc(fp) 505#define putc_unlocked(x, fp) __sputc(x, fp) 506 507#define getchar_unlocked() getc_unlocked(stdin) 508#define putchar_unlocked(x) putc_unlocked(x, stdout) 509#endif 510 511__END_DECLS 512#endif /* !_STDIO_H_ */ 513