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  */
  39
  40 #ifndef _STDIO_H_
  41 #define _STDIO_H_
  42
  43 #include <sys/cdefs.h>
  44 #include <sys/_null.h>
  45 #include <sys/types.h>
  46
  47 typedef __off_t         fpos_t;
  48
  49 #ifndef _SIZE_T_DECLARED
  50 typedef __size_t        size_t;
  51 #define _SIZE_T_DECLARED
  52 #endif
  53
  54 #if __POSIX_VISIBLE >= 200809
  55 #ifndef _OFF_T_DECLARED
  56 #define _OFF_T_DECLARED
  57 typedef __off_t         off_t;
  58 #endif
  59 #ifndef _SSIZE_T_DECLARED
  60 #define _SSIZE_T_DECLARED
  61 typedef __ssize_t       ssize_t;
  62 #endif
  63 #endif
  64
  65 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
  66 #ifndef _VA_LIST_DECLARED
  67 typedef __va_list       va_list;
  68 #define _VA_LIST_DECLARED
  69 #endif
  70 #endif
  71
  72 #define _FSTDIO                 /* Define for new stdio with functions. */
  73
  74 /*
  75  * stdio state variables.
  76  *
  77  * The following always hold:
  78  *
  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
  83  *
  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.)
  88  *
  89  * _lbfsize is used only to make the inline line-buffered output stream
  90  * code as compact as possible.
  91  *
  92  * WARNING: Do not change the order of the fields in __FILE_public!
  93  */
  94 typedef struct __FILE FILE;
  95
  96 struct __FILE_public {
  97         unsigned char   *_p;            /* current position in (some) buffer */
  98         int             _flags;         /* flags, below; this FILE is free if 0 */
  99         int             _fileno;        /* fileno, if Unix descriptor, else -1 */
 100         __ssize_t       _r;             /* read space left for getc() */
 101         __ssize_t       _w;             /* write space left for putc() */
 102         __ssize_t       _lbfsize;       /* 0 or -_bf._size, for inline putc */
 103 };
 104
 105 #ifndef _STDSTREAM_DECLARED
 106 __BEGIN_DECLS
 107 extern FILE *__stdinp;
 108 extern FILE *__stdoutp;
 109 extern FILE *__stderrp;
 110 __END_DECLS
 111 #define _STDSTREAM_DECLARED
 112 #endif
 113
 114 #define __SLBF  0x0001          /* line buffered */
 115 #define __SNBF  0x0002          /* unbuffered */
 116 #define __SRD   0x0004          /* OK to read */
 117 #define __SWR   0x0008          /* OK to write */
 118         /* RD and WR are never simultaneously asserted */
 119 #define __SRW   0x0010          /* open for reading & writing */
 120 #define __SEOF  0x0020          /* found EOF */
 121 #define __SERR  0x0040          /* found error */
 122 #define __SMBF  0x0080          /* _buf is from malloc */
 123 #define __SAPP  0x0100          /* fdopen()ed in append mode */
 124 #define __SSTR  0x0200          /* this is an sprintf/snprintf string */
 125 #define __SOPT  0x0400          /* do fseek() optimization */
 126 #define __SNPT  0x0800          /* do not do fseek() optimization */
 127 #define __SOFF  0x1000          /* set iff _offset is in fact correct */
 128 #define __SMOD  0x2000          /* true => fgetln modified _p text */
 129 #define __SALC  0x4000          /* allocate string space dynamically */
 130 #define __SIGN  0x8000          /* ignore this file in _fwalk */
 131
 132 /*
 133  * The following three definitions are for ANSI C, which took them
 134  * from System V, which brilliantly took internal interface macros and
 135  * made them official arguments to setvbuf(), without renaming them.
 136  * Hence, these ugly _IOxxx names are *supposed* to appear in user code.
 137  *
 138  * Although numbered as their counterparts above, the implementation
 139  * does not rely on this.
 140  */
 141 #define _IOFBF  0               /* setvbuf should set fully buffered */
 142 #define _IOLBF  1               /* setvbuf should set line buffered */
 143 #define _IONBF  2               /* setvbuf should set unbuffered */
 144
 145 #define BUFSIZ  1024            /* size of buffer used by setbuf */
 146 #define EOF     (-1)
 147
 148 /*
 149  * FOPEN_MAX is a minimum maximum, and is the number of streams that
 150  * stdio can provide without attempting to allocate further resources
 151  * (which could fail).  Do not use this for anything.
 152  */
 153                                 /* must be == _POSIX_STREAM_MAX <limits.h> */
 154 #ifndef FOPEN_MAX
 155 #define FOPEN_MAX       20      /* must be <= OPEN_MAX <sys/syslimits.h> */
 156 #endif
 157 #define FILENAME_MAX    1024    /* must be <= PATH_MAX <sys/syslimits.h> */
 158
 159 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
 160 #if __XSI_VISIBLE
 161 #define P_tmpdir        "/tmp/"
 162 #endif
 163 #define L_tmpnam        1024    /* XXX must be == PATH_MAX */
 164 #define TMP_MAX         308915776
 165
 166 #ifndef SEEK_SET
 167 #define SEEK_SET        0       /* set file offset to offset */
 168 #endif
 169 #ifndef SEEK_CUR
 170 #define SEEK_CUR        1       /* set file offset to current plus offset */
 171 #endif
 172 #ifndef SEEK_END
 173 #define SEEK_END        2       /* set file offset to EOF plus offset */
 174 #endif
 175
 176 #define stdin   __stdinp
 177 #define stdout  __stdoutp
 178 #define stderr  __stderrp
 179
 180 __BEGIN_DECLS
 181 /*
 182  * Functions defined in ANSI C standard.
 183  */
 184 void     clearerr(FILE *);
 185 int      fclose(FILE *);
 186 int      feof(FILE *);
 187 int      ferror(FILE *);
 188 int      fflush(FILE *);
 189 int      fgetc(FILE *);
 190 int      fgetpos(FILE * __restrict, fpos_t * __restrict);
 191 char    *fgets(char * __restrict, int, FILE * __restrict);
 192 FILE    *fopen(const char * __restrict, const char * __restrict);
 193 int      fprintf(FILE * __restrict, const char * __restrict, ...);
 194 int      fputc(int, FILE *);
 195 int      fputs(const char * __restrict, FILE * __restrict);
 196 size_t   fread(void * __restrict, size_t, size_t, FILE * __restrict);
 197 FILE    *freopen(const char * __restrict, const char * __restrict,
 198                  FILE * __restrict);
 199 int      fscanf(FILE * __restrict, const char * __restrict, ...);
 200 int      fseek(FILE *, long, int);
 201 int      fsetpos(FILE *, const fpos_t *);
 202 long     ftell(FILE *);
 203 size_t   fwrite(const void * __restrict, size_t, size_t, FILE * __restrict);
 204 int      getc(FILE *);
 205 int      getchar(void);
 206 char    *gets(char *);
 207 void     perror(const char *);
 208 int      printf(const char * __restrict, ...);
 209 int      putc(int, FILE *);
 210 int      putchar(int);
 211 int      puts(const char *);
 212 int      remove(const char *);
 213 int      rename(const char *, const char *);
 214 void     rewind(FILE *);
 215 int      scanf(const char * __restrict, ...);
 216 void     setbuf(FILE * __restrict, char * __restrict);
 217 int      setvbuf(FILE * __restrict, char * __restrict, int, size_t);
 218 int      sprintf(char * __restrict, const char * __restrict, ...);
 219 int      sscanf(const char * __restrict, const char * __restrict, ...);
 220 FILE    *tmpfile(void);
 221 char    *tmpnam(char *);
 222 int      ungetc(int, FILE *);
 223 int      vfprintf(FILE * __restrict, const char * __restrict, __va_list);
 224 int      vprintf(const char * __restrict, __va_list);
 225 int      vsprintf(char * __restrict, const char * __restrict, __va_list);
 226
 227 #if __ISO_C_VISIBLE >= 1999 || __XSI_VISIBLE >= 500
 228 int      snprintf(char * __restrict, size_t, const char * __restrict, ...)
 229             __printflike(3, 4);
 230 int      vsnprintf(char * __restrict, size_t, const char * __restrict,
 231                    __va_list) __printflike(3, 0);
 232 #endif
 233 #if __ISO_C_VISIBLE >= 1999
 234 int      vfscanf(FILE * __restrict, const char * __restrict, __va_list)
 235             __scanflike(2, 0);
 236 int      vscanf(const char * __restrict, __va_list) __scanflike(1, 0);
 237 int      vsscanf(const char * __restrict, const char * __restrict, __va_list)
 238             __scanflike(2, 0);
 239 #endif
 240
 241 /*
 242  * Functions defined in all versions of POSIX 1003.1.
 243  */
 244 #if __BSD_VISIBLE || __POSIX_VISIBLE <= 199506
 245 /* size for cuserid(3); UT_NAMESIZE + 1, see <utmp.h> */
 246 #define L_cuserid       17      /* legacy */
 247 #endif
 248
 249 #if __POSIX_VISIBLE
 250 #define L_ctermid       1024    /* size for ctermid(3); PATH_MAX */
 251
 252 char    *ctermid(char *);
 253 FILE    *fdopen(int, const char *);
 254 int      fileno(FILE *);
 255 #endif /* __POSIX_VISIBLE */
 256
 257 #if __POSIX_VISIBLE >= 199209
 258 int      pclose(FILE *);
 259 FILE    *popen(const char *, const char *);
 260 #endif
 261
 262 #if __POSIX_VISIBLE >= 199506
 263 int      ftrylockfile(FILE *);
 264 void     flockfile(FILE *);
 265 void     funlockfile(FILE *);
 266
 267 /*
 268  * These are normally used through macros as defined below, but POSIX
 269  * requires functions as well.
 270  */
 271 int      getc_unlocked(FILE *);
 272 int      getchar_unlocked(void);
 273 int      putc_unlocked(int, FILE *);
 274 int      putchar_unlocked(int);
 275 #endif
 276 #if __BSD_VISIBLE
 277 void     clearerr_unlocked(FILE *);
 278 int      feof_unlocked(FILE *);
 279 int      ferror_unlocked(FILE *);
 280 int      fileno_unlocked(FILE *);
 281 #endif
 282
 283 #if __POSIX_VISIBLE >= 200112
 284 int      fseeko(FILE *, __off_t, int);
 285 __off_t  ftello(FILE *);
 286 #endif
 287
 288 #if __BSD_VISIBLE || __XSI_VISIBLE > 0 && __XSI_VISIBLE < 600
 289 int      getw(FILE *);
 290 int      putw(int, FILE *);
 291 #endif /* BSD or X/Open before issue 6 */
 292
 293 #if __XSI_VISIBLE
 294 char    *tempnam(const char *, const char *);
 295 #endif
 296
 297 #if __POSIX_VISIBLE >= 200809
 298 ssize_t  getdelim(char ** __restrict, size_t * __restrict, int,
 299                   FILE * __restrict);
 300 int      renameat(int, const char *, int, const char *);
 301 int      vdprintf(int, const char * __restrict, __va_list) __printflike(2, 0);
 302 FILE    *fmemopen(void *__restrict, size_t, const char *__restrict);
 303 FILE    *open_memstream(char **, size_t *);
 304
 305 /*
 306  * Every programmer and his dog wrote functions called getline() and dprintf()
 307  * before POSIX.1-2008 came along and decided to usurp the names, so we
 308  * don't prototype them by default unless one of the following is true:
 309  *   a) the app has requested them specifically by defining _WITH_GETLINE or
 310  *      _WITH_DPRINTF, respectively
 311  *   b) the app has requested a POSIX.1-2008 environment via _POSIX_C_SOURCE
 312  *   c) the app defines a GNUism such as _BSD_SOURCE or _GNU_SOURCE
 313  */
 314 #ifndef _WITH_GETLINE
 315 #if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
 316 #define _WITH_GETLINE
 317 #elif defined(_POSIX_C_SOURCE)
 318 #if _POSIX_C_SOURCE >= 200809
 319 #define _WITH_GETLINE
 320 #endif
 321 #endif
 322 #endif
 323
 324 #ifdef _WITH_GETLINE
 325 ssize_t  getline(char ** __restrict, size_t * __restrict, FILE * __restrict);
 326 #endif
 327
 328 #ifndef _WITH_DPRINTF
 329 #if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
 330 #define _WITH_DPRINTF
 331 #elif defined(_POSIX_C_SOURCE)
 332 #if _POSIX_C_SOURCE >= 200809
 333 #define _WITH_DPRINTF
 334 #endif
 335 #endif
 336 #endif
 337
 338 #ifdef _WITH_DPRINTF
 339 int      dprintf(int, const char * __restrict, ...) __printflike(2, 3);
 340 #endif
 341
 342 #endif /* __POSIX_VISIBLE >= 200809 */
 343
 344 /*
 345  * Routines that are purely local.
 346  */
 347 #if __BSD_VISIBLE
 348 int      asprintf(char **, const char *, ...) __printflike(2, 3);
 349 char    *ctermid_r(char *);
 350 void     fcloseall(void);
 351 void    *fcookie(FILE *);
 352 char    *fgetln(FILE *, size_t *);
 353 const char *fmtcheck(const char *, const char *) __format_arg(2);
 354 __ssize_t __fpending(const FILE *);
 355 int      fpurge(FILE *);
 356 void     setbuffer(FILE *, char *, int);
 357 int      setlinebuf(FILE *);
 358 int      vasprintf(char **, const char *, __va_list) __printflike(2, 0);
 359
 360 /*
 361  * The system error table contains messages for the first sys_nerr
 362  * positive errno values.  Use strerror() or strerror_r() from <string.h>
 363  * instead.
 364  */
 365 extern const int sys_nerr;
 366 extern const char *const sys_errlist[];
 367
 368 /*
 369  * Stdio function-access interface.
 370  */
 371 FILE    *funopen(const void *, int (*)(void *, char *, int),
 372                  int (*)(void *, const char *, int),
 373                  fpos_t (*)(void *, fpos_t, int), int (*)(void *));
 374 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
 375 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
 376
 377 /*
 378  * Portability hacks.  See <sys/types.h>.
 379  */
 380 #ifndef _FTRUNCATE_DECLARED
 381 #define _FTRUNCATE_DECLARED
 382 int      ftruncate(int, __off_t);
 383 #endif
 384 #ifndef _LSEEK_DECLARED
 385 #define _LSEEK_DECLARED
 386 __off_t  lseek(int, __off_t, int);
 387 #endif
 388 #ifndef _MMAP_DECLARED
 389 #define _MMAP_DECLARED
 390 void    *mmap(void *, size_t, int, int, int, __off_t);
 391 #endif
 392 #ifndef _TRUNCATE_DECLARED
 393 #define _TRUNCATE_DECLARED
 394 int      truncate(const char *, __off_t);
 395 #endif
 396 #endif /* __BSD_VISIBLE */
 397
 398 /*
 399  * Functions internal to the implementation.
 400  */
 401 int     __srget(FILE *);
 402 int     __swbuf(int, FILE *);
 403
 404 /*
 405  * The __sfoo functions are here so that we can
 406  * define real function versions in the C library.
 407  */
 408 static __inline int
 409 __sgetc(FILE *_fp)
 410 {
 411         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 412
 413         if (--_p->_r < 0)
 414                 return (__srget(_fp));
 415         else
 416                 return (*_p->_p++);
 417 }
 418
 419 static __inline int
 420 __sputc(int _c, FILE *_fp)
 421 {
 422         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 423
 424         if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && _c != '\n'))
 425                 return (*_p->_p++ = _c);
 426         else
 427                 return (__swbuf(_c, _fp));
 428 }
 429
 430 static __inline int
 431 __sfeof(FILE *_fp)
 432 {
 433         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 434
 435         return ((_p->_flags & __SEOF) != 0);
 436 }
 437
 438 static __inline int
 439 __sferror(FILE *_fp)
 440 {
 441         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 442
 443         return ((_p->_flags & __SERR) != 0);
 444 }
 445
 446 static __inline void
 447 __sclearerr(FILE *_fp)
 448 {
 449         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 450
 451         _p->_flags &= ~(__SERR|__SEOF);
 452 }
 453
 454 static __inline int
 455 __sfileno(FILE *_fp)
 456 {
 457         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 458
 459         return (_p->_fileno);
 460 }
 461
 462 extern int __isthreaded;
 463
 464 #define feof(p)         (!__isthreaded ? __sfeof(p) : (feof)(p))
 465 #define ferror(p)       (!__isthreaded ? __sferror(p) : (ferror)(p))
 466 #define clearerr(p)     (!__isthreaded ? __sclearerr(p) : (clearerr)(p))
 467
 468 #if __POSIX_VISIBLE
 469 #define fileno(p)       (!__isthreaded ? __sfileno(p) : (fileno)(p))
 470 #endif
 471
 472 #define getc(fp)        (!__isthreaded ? __sgetc(fp) : (getc)(fp))
 473 #define putc(x, fp)     (!__isthreaded ? __sputc(x, fp) : (putc)(x, fp))
 474
 475 #define getchar()       getc(stdin)
 476 #define putchar(x)      putc(x, stdout)
 477
 478 #if __BSD_VISIBLE
 479 /*
 480  * See ISO/IEC 9945-1 ANSI/IEEE Std 1003.1 Second Edition 1996-07-12
 481  * B.8.2.7 for the rationale behind the *_unlocked() macros.
 482  */
 483 #define feof_unlocked(p)        __sfeof(p)
 484 #define ferror_unlocked(p)      __sferror(p)
 485 #define clearerr_unlocked(p)    __sclearerr(p)
 486 #define fileno_unlocked(p)      __sfileno(p)
 487 #endif
 488 #if __POSIX_VISIBLE >= 199506
 489 #define getc_unlocked(fp)       __sgetc(fp)
 490 #define putc_unlocked(x, fp)    __sputc(x, fp)
 491
 492 #define getchar_unlocked()      getc_unlocked(stdin)
 493 #define putchar_unlocked(x)     putc_unlocked(x, stdout)
 494 #endif
 495
 496 __END_DECLS
 497 #endif /* !_STDIO_H_ */