include/stdio.h

   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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)stdio.h     8.5 (Berkeley) 4/29/95
  37  * $FreeBSD: src/include/stdio.h,v 1.78 2009/03/25 08:07:52 das Exp $
  38  * $DragonFly: src/include/stdio.h,v 1.14 2008/06/05 17:53:10 swildner Exp $
  39  */
  40
  41 #ifndef _STDIO_H_
  42 #define _STDIO_H_
  43
  44 #include <sys/cdefs.h>
  45 #include <sys/_null.h>
  46 #include <sys/types.h>
  47
  48 typedef __off_t         fpos_t;
  49
  50 #ifndef _SIZE_T_DECLARED
  51 typedef __size_t        size_t;
  52 #define _SIZE_T_DECLARED
  53 #endif
  54
  55 #if __BSD_VISIBLE || __POSIX_VISIBLE >= 200809
  56 #ifndef _OFF_T_DECLARED
  57 #define _OFF_T_DECLARED
  58 typedef __off_t         off_t;
  59 #endif
  60 #ifndef _SSIZE_T_DECLARED
  61 #define _SSIZE_T_DECLARED
  62 typedef __ssize_t       ssize_t;
  63 #endif
  64 #endif
  65
  66 #if __BSD_VISIBLE || __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
  67 #ifndef _VA_LIST_DECLARED
  68 typedef __va_list       va_list;
  69 #define _VA_LIST_DECLARED
  70 #endif
  71 #endif
  72
  73 #define _FSTDIO                 /* Define for new stdio with functions. */
  74
  75 /*
  76  * stdio state variables.
  77  *
  78  * The following always hold:
  79  *
  80  *      if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
  81  *              _lbfsize is -_bf._size, else _lbfsize is 0
  82  *      if _flags&__SRD, _w is 0
  83  *      if _flags&__SWR, _r is 0
  84  *
  85  * This ensures that the getc and putc macros (or inline functions) never
  86  * try to write or read from a file that is in `read' or `write' mode.
  87  * (Moreover, they can, and do, automatically switch from read mode to
  88  * write mode, and back, on "r+" and "w+" files.)
  89  *
  90  * _lbfsize is used only to make the inline line-buffered output stream
  91  * code as compact as possible.
  92  *
  93  * WARNING: Do not change the order of the fields in __FILE_public!
  94  */
  95 typedef struct __FILE FILE;
  96
  97 struct __FILE_public {
  98         unsigned char   *_p;            /* current position in (some) buffer */
  99         int             _flags;         /* flags, below; this FILE is free if 0 */
 100         int             _fileno;        /* fileno, if Unix descriptor, else -1 */
 101         __ssize_t       _r;             /* read space left for getc() */
 102         __ssize_t       _w;             /* write space left for putc() */
 103         __ssize_t       _lbfsize;       /* 0 or -_bf._size, for inline putc */
 104 };
 105
 106 #ifndef _STDSTREAM_DECLARED
 107 __BEGIN_DECLS
 108 extern FILE *__stdinp;
 109 extern FILE *__stdoutp;
 110 extern FILE *__stderrp;
 111 __END_DECLS
 112 #define _STDSTREAM_DECLARED
 113 #endif
 114
 115 #define __SLBF  0x0001          /* line buffered */
 116 #define __SNBF  0x0002          /* unbuffered */
 117 #define __SRD   0x0004          /* OK to read */
 118 #define __SWR   0x0008          /* OK to write */
 119         /* RD and WR are never simultaneously asserted */
 120 #define __SRW   0x0010          /* open for reading & writing */
 121 #define __SEOF  0x0020          /* found EOF */
 122 #define __SERR  0x0040          /* found error */
 123 #define __SMBF  0x0080          /* _buf is from malloc */
 124 #define __SAPP  0x0100          /* fdopen()ed in append mode */
 125 #define __SSTR  0x0200          /* this is an sprintf/snprintf string */
 126 #define __SOPT  0x0400          /* do fseek() optimization */
 127 #define __SNPT  0x0800          /* do not do fseek() optimization */
 128 #define __SOFF  0x1000          /* set iff _offset is in fact correct */
 129 #define __SMOD  0x2000          /* true => fgetln modified _p text */
 130 #define __SALC  0x4000          /* allocate string space dynamically */
 131 #define __SIGN  0x8000          /* ignore this file in _fwalk */
 132
 133 /*
 134  * The following three definitions are for ANSI C, which took them
 135  * from System V, which brilliantly took internal interface macros and
 136  * made them official arguments to setvbuf(), without renaming them.
 137  * Hence, these ugly _IOxxx names are *supposed* to appear in user code.
 138  *
 139  * Although numbered as their counterparts above, the implementation
 140  * does not rely on this.
 141  */
 142 #define _IOFBF  0               /* setvbuf should set fully buffered */
 143 #define _IOLBF  1               /* setvbuf should set line buffered */
 144 #define _IONBF  2               /* setvbuf should set unbuffered */
 145
 146 #define BUFSIZ  1024            /* size of buffer used by setbuf */
 147 #define EOF     (-1)
 148
 149 /*
 150  * FOPEN_MAX is a minimum maximum, and is the number of streams that
 151  * stdio can provide without attempting to allocate further resources
 152  * (which could fail).  Do not use this for anything.
 153  */
 154                                 /* must be == _POSIX_STREAM_MAX <limits.h> */
 155 #ifndef FOPEN_MAX
 156 #define FOPEN_MAX       20      /* must be <= OPEN_MAX <sys/syslimits.h> */
 157 #endif
 158 #define FILENAME_MAX    1024    /* must be <= PATH_MAX <sys/syslimits.h> */
 159
 160 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
 161 #if __XSI_VISIBLE
 162 #define P_tmpdir        "/tmp/"
 163 #endif
 164 #define L_tmpnam        1024    /* XXX must be == PATH_MAX */
 165 #define TMP_MAX         308915776
 166
 167 #ifndef SEEK_SET
 168 #define SEEK_SET        0       /* set file offset to offset */
 169 #endif
 170 #ifndef SEEK_CUR
 171 #define SEEK_CUR        1       /* set file offset to current plus offset */
 172 #endif
 173 #ifndef SEEK_END
 174 #define SEEK_END        2       /* set file offset to EOF plus offset */
 175 #endif
 176
 177 #define stdin   __stdinp
 178 #define stdout  __stdoutp
 179 #define stderr  __stderrp
 180
 181 __BEGIN_DECLS
 182 /*
 183  * Functions defined in ANSI C standard.
 184  */
 185 void     clearerr(FILE *);
 186 int      fclose(FILE *);
 187 int      feof(FILE *);
 188 int      ferror(FILE *);
 189 int      fflush(FILE *);
 190 int      fgetc(FILE *);
 191 int      fgetpos(FILE * __restrict, fpos_t * __restrict);
 192 char    *fgets(char * __restrict, int, FILE * __restrict);
 193 FILE    *fopen(const char * __restrict, const char * __restrict);
 194 int      fprintf(FILE * __restrict, const char * __restrict, ...);
 195 int      fputc(int, FILE *);
 196 int      fputs(const char * __restrict, FILE * __restrict);
 197 size_t   fread(void * __restrict, size_t, size_t, FILE * __restrict);
 198 FILE    *freopen(const char * __restrict, const char * __restrict,
 199                  FILE * __restrict);
 200 int      fscanf(FILE * __restrict, const char * __restrict, ...);
 201 int      fseek(FILE *, long, int);
 202 int      fsetpos(FILE *, const fpos_t *);
 203 long     ftell(FILE *);
 204 size_t   fwrite(const void * __restrict, size_t, size_t, FILE * __restrict);
 205 int      getc(FILE *);
 206 int      getchar(void);
 207 char    *gets(char *);
 208 void     perror(const char *);
 209 int      printf(const char * __restrict, ...);
 210 int      putc(int, FILE *);
 211 int      putchar(int);
 212 int      puts(const char *);
 213 int      remove(const char *);
 214 int      rename(const char *, const char *);
 215 void     rewind(FILE *);
 216 int      scanf(const char * __restrict, ...);
 217 void     setbuf(FILE * __restrict, char * __restrict);
 218 int      setvbuf(FILE * __restrict, char * __restrict, int, size_t);
 219 int      sprintf(char * __restrict, const char * __restrict, ...);
 220 int      sscanf(const char * __restrict, const char * __restrict, ...);
 221 FILE    *tmpfile(void);
 222 char    *tmpnam(char *);
 223 int      ungetc(int, FILE *);
 224 int      vfprintf(FILE * __restrict, const char * __restrict, __va_list);
 225 int      vprintf(const char * __restrict, __va_list);
 226 int      vsprintf(char * __restrict, const char * __restrict, __va_list);
 227
 228 #if __ISO_C_VISIBLE >= 1999
 229 int      snprintf(char * __restrict, size_t, const char * __restrict, ...)
 230             __printflike(3, 4);
 231 int      vfscanf(FILE * __restrict, const char * __restrict, __va_list)
 232             __scanflike(2, 0);
 233 int      vscanf(const char * __restrict, __va_list) __scanflike(1, 0);
 234 int      vsnprintf(char * __restrict, size_t, const char * __restrict,
 235                    __va_list) __printflike(3, 0);
 236 int      vsscanf(const char * __restrict, const char * __restrict, __va_list)
 237             __scanflike(2, 0);
 238 #endif
 239
 240 /*
 241  * Functions defined in all versions of POSIX 1003.1.
 242  */
 243 #if __BSD_VISIBLE || __POSIX_VISIBLE <= 199506
 244 /* size for cuserid(3); UT_NAMESIZE + 1, see <utmp.h> */
 245 #define L_cuserid       17      /* legacy */
 246 #endif
 247
 248 #if __POSIX_VISIBLE
 249 #define L_ctermid       1024    /* size for ctermid(3); PATH_MAX */
 250
 251 char    *ctermid(char *);
 252 FILE    *fdopen(int, const char *);
 253 int      fileno(FILE *);
 254 #endif /* __POSIX_VISIBLE */
 255
 256 #if __POSIX_VISIBLE >= 199209
 257 int      pclose(FILE *);
 258 FILE    *popen(const char *, const char *);
 259 #endif
 260
 261 #if __POSIX_VISIBLE >= 199506
 262 int      ftrylockfile(FILE *);
 263 void     flockfile(FILE *);
 264 void     funlockfile(FILE *);
 265
 266 /*
 267  * These are normally used through macros as defined below, but POSIX
 268  * requires functions as well.
 269  */
 270 int      getc_unlocked(FILE *);
 271 int      getchar_unlocked(void);
 272 int      putc_unlocked(int, FILE *);
 273 int      putchar_unlocked(int);
 274 #endif
 275 #if __BSD_VISIBLE
 276 void     clearerr_unlocked(FILE *);
 277 int      feof_unlocked(FILE *);
 278 int      ferror_unlocked(FILE *);
 279 int      fileno_unlocked(FILE *);
 280 #endif
 281
 282 #if __POSIX_VISIBLE >= 200112
 283 int      fseeko(FILE *, __off_t, int);
 284 __off_t  ftello(FILE *);
 285 #endif
 286
 287 #if __BSD_VISIBLE || __XSI_VISIBLE > 0 && __XSI_VISIBLE < 600
 288 int      getw(FILE *);
 289 int      putw(int, FILE *);
 290 #endif /* BSD or X/Open before issue 6 */
 291
 292 #if __XSI_VISIBLE
 293 char    *tempnam(const char *, const char *);
 294 #endif
 295
 296 #if __BSD_VISIBLE || __POSIX_VISIBLE >= 200809
 297 ssize_t  getdelim(char ** __restrict, size_t * __restrict, int,
 298                   FILE * __restrict);
 299 /* int   renameat(int, const char *, int, const char *); */
 300 int      vdprintf(int, const char * __restrict, __va_list);
 301
 302 /*
 303  * Every programmer and his dog wrote functions called getline() and dprintf()
 304  * before POSIX.1-2008 came along and decided to usurp the names, so we
 305  * don't prototype them by default unless one of the following is true:
 306  *   a) the app has requested them specifically by defining _WITH_GETLINE or
 307  *      _WITH_DPRINTF, respectively
 308  *   b) the app has requested a POSIX.1-2008 environment via _POSIX_C_SOURCE
 309  *   c) the app defines a GNUism such as _BSD_SOURCE or _GNU_SOURCE
 310  */
 311 #ifndef _WITH_GETLINE
 312 #if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
 313 #define _WITH_GETLINE
 314 #elif defined(_POSIX_C_SOURCE)
 315 #if _POSIX_C_SOURCE >= 200809
 316 #define _WITH_GETLINE
 317 #endif
 318 #endif
 319 #endif
 320
 321 #ifdef _WITH_GETLINE
 322 ssize_t  getline(char ** __restrict, size_t * __restrict, FILE * __restrict);
 323 #endif
 324
 325 #ifndef _WITH_DPRINTF
 326 #if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
 327 #define _WITH_DPRINTF
 328 #elif defined(_POSIX_C_SOURCE)
 329 #if _POSIX_C_SOURCE >= 200809
 330 #define _WITH_DPRINTF
 331 #endif
 332 #endif
 333 #endif
 334
 335 #ifdef _WITH_DPRINTF
 336 int      dprintf(int, const char * __restrict, ...);
 337 #endif
 338
 339 #endif /* __BSD_VISIBLE || __POSIX_VISIBLE >= 200809 */
 340
 341 /*
 342  * Routines that are purely local.
 343  */
 344 #if __BSD_VISIBLE
 345 int      asprintf(char **, const char *, ...) __printflike(2, 3);
 346 char    *ctermid_r(char *);
 347 void     fcloseall(void);
 348 void    *fcookie(FILE *);
 349 char    *fgetln(FILE *, size_t *);
 350 const char *fmtcheck(const char *, const char *) __format_arg(2);
 351 __ssize_t __fpending(const FILE *);
 352 int      fpurge(FILE *);
 353 void     setbuffer(FILE *, char *, int);
 354 int      setlinebuf(FILE *);
 355 int      vasprintf(char **, const char *, __va_list) __printflike(2, 0);
 356
 357 /*
 358  * The system error table contains messages for the first sys_nerr
 359  * positive errno values.  Use strerror() or strerror_r() from <string.h>
 360  * instead.
 361  */
 362 extern __const int sys_nerr;
 363 extern __const char *__const sys_errlist[];
 364
 365 /*
 366  * Stdio function-access interface.
 367  */
 368 FILE    *funopen(const void *, int (*)(void *, char *, int),
 369                  int (*)(void *, const char *, int),
 370                  fpos_t (*)(void *, fpos_t, int), int (*)(void *));
 371 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
 372 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
 373
 374 /*
 375  * Portability hacks.  See <sys/types.h>.
 376  */
 377 #ifndef _FTRUNCATE_DECLARED
 378 #define _FTRUNCATE_DECLARED
 379 int      ftruncate(int, __off_t);
 380 #endif
 381 #ifndef _LSEEK_DECLARED
 382 #define _LSEEK_DECLARED
 383 __off_t  lseek(int, __off_t, int);
 384 #endif
 385 #ifndef _MMAP_DECLARED
 386 #define _MMAP_DECLARED
 387 void    *mmap(void *, size_t, int, int, int, __off_t);
 388 #endif
 389 #ifndef _TRUNCATE_DECLARED
 390 #define _TRUNCATE_DECLARED
 391 int      truncate(const char *, __off_t);
 392 #endif
 393 #endif /* __BSD_VISIBLE */
 394
 395 /*
 396  * Functions internal to the implementation.
 397  */
 398 int     __srget(FILE *);
 399 int     __swbuf(int, FILE *);
 400
 401 /*
 402  * The __sfoo functions are here so that we can
 403  * define real function versions in the C library.
 404  */
 405 static __inline int
 406 __sgetc(FILE *_fp)
 407 {
 408         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 409
 410         if (--_p->_r < 0)
 411                 return (__srget(_fp));
 412         else
 413                 return (*_p->_p++);
 414 }
 415
 416 static __inline int
 417 __sputc(int _c, FILE *_fp)
 418 {
 419         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 420
 421         if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && _c != '\n'))
 422                 return (*_p->_p++ = _c);
 423         else
 424                 return (__swbuf(_c, _fp));
 425 }
 426
 427 static __inline int
 428 __sfeof(FILE *_fp)
 429 {
 430         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 431
 432         return ((_p->_flags & __SEOF) != 0);
 433 }
 434
 435 static __inline int
 436 __sferror(FILE *_fp)
 437 {
 438         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 439
 440         return ((_p->_flags & __SERR) != 0);
 441 }
 442
 443 static __inline void
 444 __sclearerr(FILE *_fp)
 445 {
 446         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 447
 448         _p->_flags &= ~(__SERR|__SEOF);
 449 }
 450
 451 static __inline int
 452 __sfileno(FILE *_fp)
 453 {
 454         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 455
 456         return (_p->_fileno);
 457 }
 458
 459 extern int __isthreaded;
 460
 461 #define feof(p)         (!__isthreaded ? __sfeof(p) : (feof)(p))
 462 #define ferror(p)       (!__isthreaded ? __sferror(p) : (ferror)(p))
 463 #define clearerr(p)     (!__isthreaded ? __sclearerr(p) : (clearerr)(p))
 464
 465 #if __POSIX_VISIBLE
 466 #define fileno(p)       (!__isthreaded ? __sfileno(p) : (fileno)(p))
 467 #endif
 468
 469 #define getc(fp)        (!__isthreaded ? __sgetc(fp) : (getc)(fp))
 470 #define putc(x, fp)     (!__isthreaded ? __sputc(x, fp) : (putc)(x, fp))
 471
 472 #define getchar()       getc(stdin)
 473 #define putchar(x)      putc(x, stdout)
 474
 475 #if __BSD_VISIBLE
 476 /*
 477  * See ISO/IEC 9945-1 ANSI/IEEE Std 1003.1 Second Edition 1996-07-12
 478  * B.8.2.7 for the rationale behind the *_unlocked() macros.
 479  */
 480 #define feof_unlocked(p)        __sfeof(p)
 481 #define ferror_unlocked(p)      __sferror(p)
 482 #define clearerr_unlocked(p)    __sclearerr(p)
 483 #define fileno_unlocked(p)      __sfileno(p)
 484 #endif
 485 #if __POSIX_VISIBLE >= 199506
 486 #define getc_unlocked(fp)       __sgetc(fp)
 487 #define putc_unlocked(x, fp)    __sputc(x, fp)
 488
 489 #define getchar_unlocked()      getc_unlocked(stdin)
 490 #define putchar_unlocked(x)     putc_unlocked(x, stdout)
 491 #endif
 492
 493 __END_DECLS
 494 #endif /* !_STDIO_H_ */