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. 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: src/include/stdio.h,v 1.78 2009/03/25 08:07:52 das Exp $
  34  */
  35
  36 #ifndef _STDIO_H_
  37 #define _STDIO_H_
  38
  39 #include <sys/cdefs.h>
  40 #include <sys/_null.h>
  41 #if __BSD_VISIBLE
  42 #include <sys/types.h>
  43 #else
  44 #include <machine/stdint.h>
  45 #endif
  46 #include <machine/stdarg.h> /* for __va_list */
  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 __EXT1_VISIBLE
  56 #ifndef _RSIZE_T_DECLARED
  57 #define _RSIZE_T_DECLARED
  58 typedef size_t          rsize_t;
  59 #endif
  60 #endif
  61
  62 /* Should be '__POSIX_VISIBLE >= 200809' but stick with fseeko()/ftello() */
  63 #if __XSI_VISIBLE >= 500 || __POSIX_VISIBLE >= 200112
  64 #ifndef _OFF_T_DECLARED
  65 #define _OFF_T_DECLARED
  66 typedef __off_t         off_t;
  67 #endif
  68 #ifndef _SSIZE_T_DECLARED
  69 #define _SSIZE_T_DECLARED
  70 typedef __ssize_t       ssize_t;
  71 #endif
  72 #endif
  73
  74 #if __POSIX_VISIBLE >= 200809 || __XSI_VISIBLE
  75 #ifdef __GNUC__
  76 #ifndef _VA_LIST_DECLARED
  77 #define _VA_LIST_DECLARED
  78 typedef __va_list       va_list;
  79 /* __gnuc_va_list is not needed, provided by <machine/stdarg.h> */
  80 #endif
  81 #else
  82 #include <stdarg.h>
  83 #endif
  84 #endif
  85
  86 #define _FSTDIO                 /* Define for new stdio with functions. */
  87
  88 /*
  89  * stdio state variables.
  90  *
  91  * The following always hold:
  92  *
  93  *      if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
  94  *              _lbfsize is -_bf._size, else _lbfsize is 0
  95  *      if _flags&__SRD, _w is 0
  96  *      if _flags&__SWR, _r is 0
  97  *
  98  * This ensures that the getc and putc macros (or inline functions) never
  99  * try to write or read from a file that is in `read' or `write' mode.
 100  * (Moreover, they can, and do, automatically switch from read mode to
 101  * write mode, and back, on "r+" and "w+" files.)
 102  *
 103  * _lbfsize is used only to make the inline line-buffered output stream
 104  * code as compact as possible.
 105  *
 106  * WARNING: Do not change the order of the fields in __FILE_public!
 107  */
 108 #ifndef _STDFILE_DECLARED
 109 #define _STDFILE_DECLARED
 110 typedef struct __FILE FILE;
 111 #endif
 112
 113 struct __FILE_public {
 114         unsigned char   *_p;            /* current position in (some) buffer */
 115         int             _flags;         /* flags, below; this FILE is free if 0 */
 116         int             _fileno;        /* fileno, if Unix descriptor, else -1 */
 117         __ssize_t       _r;             /* read space left for getc() */
 118         __ssize_t       _w;             /* write space left for putc() */
 119         __ssize_t       _lbfsize;       /* 0 or -_bf._size, for inline putc */
 120 };
 121
 122 #ifndef _STDSTREAM_DECLARED
 123 __BEGIN_DECLS
 124 extern FILE *__stdinp;
 125 extern FILE *__stdoutp;
 126 extern FILE *__stderrp;
 127 __END_DECLS
 128 #define _STDSTREAM_DECLARED
 129 #endif
 130
 131 #define __SLBF  0x0001          /* line buffered */
 132 #define __SNBF  0x0002          /* unbuffered */
 133 #define __SRD   0x0004          /* OK to read */
 134 #define __SWR   0x0008          /* OK to write */
 135         /* RD and WR are never simultaneously asserted */
 136 #define __SRW   0x0010          /* open for reading & writing */
 137 #define __SEOF  0x0020          /* found EOF */
 138 #define __SERR  0x0040          /* found error */
 139 #define __SMBF  0x0080          /* _buf is from malloc */
 140 #define __SAPP  0x0100          /* fdopen()ed in append mode */
 141 #define __SSTR  0x0200          /* this is an sprintf/snprintf string */
 142 #define __SOPT  0x0400          /* do fseek() optimization */
 143 #define __SNPT  0x0800          /* do not do fseek() optimization */
 144 #define __SOFF  0x1000          /* set iff _offset is in fact correct */
 145 #define __SMOD  0x2000          /* true => fgetln modified _p text */
 146 #define __SALC  0x4000          /* allocate string space dynamically */
 147 #define __SIGN  0x8000          /* ignore this file in _fwalk */
 148
 149 /*
 150  * The following three definitions are for ANSI C, which took them
 151  * from System V, which brilliantly took internal interface macros and
 152  * made them official arguments to setvbuf(), without renaming them.
 153  * Hence, these ugly _IOxxx names are *supposed* to appear in user code.
 154  *
 155  * Although numbered as their counterparts above, the implementation
 156  * does not rely on this.
 157  */
 158 #define _IOFBF  0               /* setvbuf should set fully buffered */
 159 #define _IOLBF  1               /* setvbuf should set line buffered */
 160 #define _IONBF  2               /* setvbuf should set unbuffered */
 161
 162 #define BUFSIZ  1024            /* size of buffer used by setbuf */
 163 #define EOF     (-1)
 164
 165 /*
 166  * FOPEN_MAX is a minimum maximum, and is the number of streams that
 167  * stdio can provide without attempting to allocate further resources
 168  * (which could fail).  Do not use this for anything.
 169  */
 170                                 /* must be == _POSIX_STREAM_MAX <limits.h> */
 171 #ifndef FOPEN_MAX
 172 #define FOPEN_MAX       20      /* must be <= OPEN_MAX <sys/syslimits.h> */
 173 #endif
 174 #define FILENAME_MAX    1024    /* must be <= PATH_MAX <sys/syslimits.h> */
 175
 176 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
 177 #if __XSI_VISIBLE
 178 #define P_tmpdir        "/tmp/"
 179 #endif
 180 #define L_tmpnam        1024    /* XXX must be == PATH_MAX */
 181 #define TMP_MAX         308915776
 182
 183 /* Always ensure that these are consistent with <fcntl.h> and <unistd.h>! */
 184 #ifndef SEEK_SET
 185 #define SEEK_SET        0       /* set file offset to offset */
 186 #endif
 187 #ifndef SEEK_CUR
 188 #define SEEK_CUR        1       /* set file offset to current plus offset */
 189 #endif
 190 #ifndef SEEK_END
 191 #define SEEK_END        2       /* set file offset to EOF plus offset */
 192 #endif
 193
 194 #define stdin   __stdinp
 195 #define stdout  __stdoutp
 196 #define stderr  __stderrp
 197
 198 #if __BSD_VISIBLE
 199 /* fparseln(3) */
 200 #define FPARSELN_UNESCESC       0x01
 201 #define FPARSELN_UNESCCONT      0x02
 202 #define FPARSELN_UNESCCOMM      0x04
 203 #define FPARSELN_UNESCREST      0x08
 204 #define FPARSELN_UNESCALL       0x0f
 205 #endif
 206
 207 __BEGIN_DECLS
 208 #ifdef _XLOCALE_H_
 209 #include <xlocale/_stdio.h>
 210 #endif
 211 /*
 212  * Functions defined in ANSI C standard.
 213  */
 214 void     clearerr(FILE *);
 215 int      fclose(FILE *);
 216 int      feof(FILE *);
 217 int      ferror(FILE *);
 218 int      fflush(FILE *);
 219 int      fgetc(FILE *);
 220 int      fgetpos(FILE * __restrict, fpos_t * __restrict);
 221 char    *fgets(char * __restrict, int, FILE * __restrict);
 222 FILE    *fopen(const char * __restrict, const char * __restrict);
 223 int      fprintf(FILE * __restrict, const char * __restrict, ...)
 224              __printflike(2, 3);
 225 int      fputc(int, FILE *);
 226 int      fputs(const char * __restrict, FILE * __restrict);
 227 size_t   fread(void * __restrict, size_t, size_t, FILE * __restrict);
 228 FILE    *freopen(const char * __restrict, const char * __restrict,
 229                  FILE * __restrict);
 230 int      fscanf(FILE * __restrict, const char * __restrict, ...)
 231              __scanflike(2, 3);
 232 int      fseek(FILE *, long, int);
 233 int      fsetpos(FILE *, const fpos_t *);
 234 long     ftell(FILE *);
 235 size_t   fwrite(const void * __restrict, size_t, size_t, FILE * __restrict);
 236 int      getc(FILE *);
 237 int      getchar(void);
 238 char    *gets(char *);
 239 #if __EXT1_VISIBLE
 240 char    *gets_s(char *, rsize_t);
 241 #endif
 242 void     perror(const char *);
 243 int      printf(const char * __restrict, ...) __printflike(1, 2);
 244 int      putc(int, FILE *);
 245 int      putchar(int);
 246 int      puts(const char *);
 247 int      remove(const char *);
 248 int      rename(const char *, const char *);
 249 void     rewind(FILE *);
 250 int      scanf(const char * __restrict, ...) __scanflike(1, 2);
 251 void     setbuf(FILE * __restrict, char * __restrict);
 252 int      setvbuf(FILE * __restrict, char * __restrict, int, size_t);
 253 int      sprintf(char * __restrict, const char * __restrict, ...)
 254              __printflike(2, 3);
 255 int      sscanf(const char * __restrict, const char * __restrict, ...)
 256              __scanflike(2, 3);
 257 FILE    *tmpfile(void);
 258 char    *tmpnam(char *);
 259 int      ungetc(int, FILE *);
 260 int      vfprintf(FILE * __restrict, const char * __restrict, __va_list)
 261              __printflike(2, 0);
 262 int      vprintf(const char * __restrict, __va_list) __printflike(1, 0);
 263 int      vsprintf(char * __restrict, const char * __restrict, __va_list)
 264              __printflike(2, 0);
 265
 266 #if __ISO_C_VISIBLE >= 1999 || __XSI_VISIBLE >= 500
 267 int      snprintf(char * __restrict, size_t, const char * __restrict, ...)
 268             __printflike(3, 4);
 269 int      vsnprintf(char * __restrict, size_t, const char * __restrict,
 270                    __va_list) __printflike(3, 0);
 271 #endif
 272 #if __ISO_C_VISIBLE >= 1999
 273 int      vfscanf(FILE * __restrict, const char * __restrict, __va_list)
 274             __scanflike(2, 0);
 275 int      vscanf(const char * __restrict, __va_list) __scanflike(1, 0);
 276 int      vsscanf(const char * __restrict, const char * __restrict, __va_list)
 277             __scanflike(2, 0);
 278 #endif
 279
 280 /*
 281  * Functions defined in all versions of POSIX 1003.1.
 282  */
 283 #if __BSD_VISIBLE || (__POSIX_VISIBLE && __POSIX_VISIBLE < 200112)
 284 #define L_cuserid       17      /* size for cuserid(3); MAXLOGNAME, legacy */
 285 #endif
 286
 287 #if __POSIX_VISIBLE
 288 #define L_ctermid       1024    /* size for ctermid(3); PATH_MAX */
 289
 290 char    *ctermid(char *);
 291 FILE    *fdopen(int, const char *);
 292 int      fileno(FILE *);
 293 #endif /* __POSIX_VISIBLE */
 294
 295 #if __POSIX_VISIBLE >= 199209
 296 int      pclose(FILE *);
 297 FILE    *popen(const char *, const char *);
 298 #endif
 299
 300 #if __POSIX_VISIBLE >= 199506
 301 int      ftrylockfile(FILE *);
 302 void     flockfile(FILE *);
 303 void     funlockfile(FILE *);
 304
 305 /*
 306  * These are normally used through macros as defined below, but POSIX
 307  * requires functions as well.
 308  */
 309 int      getc_unlocked(FILE *);
 310 int      getchar_unlocked(void);
 311 int      putc_unlocked(int, FILE *);
 312 int      putchar_unlocked(int);
 313 #endif
 314 #if __BSD_VISIBLE
 315 void     clearerr_unlocked(FILE *);
 316 int      feof_unlocked(FILE *);
 317 int      ferror_unlocked(FILE *);
 318 int      fflush_unlocked(FILE *);
 319 int      fileno_unlocked(FILE *);
 320 int      fputc_unlocked(int, FILE *);
 321 int      fputs_unlocked(const char * __restrict, FILE * __restrict);
 322 size_t   fread_unlocked(void * __restrict, size_t, size_t, FILE * __restrict);
 323 size_t   fwrite_unlocked(const void * __restrict, size_t, size_t,
 324              FILE * __restrict);
 325 #endif
 326
 327 #if __XSI_VISIBLE >= 500 || __POSIX_VISIBLE >= 200112
 328 int      fseeko(FILE *, off_t, int);
 329 off_t    ftello(FILE *);
 330 #endif
 331
 332 #if __BSD_VISIBLE || (__XSI_VISIBLE && __XSI_VISIBLE < 600)
 333 int      getw(FILE *);
 334 int      putw(int, FILE *);
 335 #endif /* BSD or X/Open before issue 6 */
 336
 337 #if __XSI_VISIBLE
 338 char    *tempnam(const char *, const char *);
 339 #endif
 340
 341 #if __POSIX_VISIBLE >= 200809
 342 FILE    *fmemopen(void *__restrict, size_t, const char *__restrict);
 343 ssize_t  getdelim(char ** __restrict, size_t * __restrict, int,
 344                   FILE * __restrict);
 345 FILE    *open_memstream(char **, size_t *);
 346 int      renameat(int, const char *, int, const char *);
 347 int      vdprintf(int, const char * __restrict, __va_list) __printflike(2, 0);
 348 int      dprintf(int, const char * __restrict, ...) __printflike(2, 3);
 349 ssize_t  getline(char ** __restrict, size_t * __restrict, FILE * __restrict);
 350 #endif /* __POSIX_VISIBLE >= 200809 */
 351
 352 /*
 353  * Routines that are purely local.
 354  */
 355 #if __BSD_VISIBLE
 356 int      asprintf(char **, const char *, ...) __printflike(2, 3);
 357 char    *ctermid_r(char *);
 358 void     fcloseall(void);
 359 void    *fcookie(FILE *);
 360 char    *fgetln(FILE *, size_t *);
 361 const char *fmtcheck(const char *, const char *) __format_arg(2);
 362 char    *fparseln(FILE *, size_t *, size_t *, const char[3], int);
 363 __ssize_t __fpending(const FILE *);
 364 int      fpurge(FILE *);
 365 void     setbuffer(FILE *, char *, int);
 366 int      setlinebuf(FILE *);
 367 int      vasprintf(char **, const char *, __va_list) __printflike(2, 0);
 368
 369 /*
 370  * The system error table contains messages for the first sys_nerr
 371  * positive errno values.  Use strerror() or strerror_r() from <string.h>
 372  * instead.
 373  */
 374 extern const int sys_nerr;
 375 extern const char *const sys_errlist[];
 376
 377 /*
 378  * Stdio function-access interface.
 379  */
 380 FILE    *funopen(const void *, int (*)(void *, char *, int),
 381                  int (*)(void *, const char *, int),
 382                  fpos_t (*)(void *, fpos_t, int), int (*)(void *));
 383 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
 384 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
 385
 386 typedef __ssize_t cookie_read_function_t(void *, char *, size_t);
 387 typedef __ssize_t cookie_write_function_t(void *, const char *, size_t);
 388 typedef int cookie_seek_function_t(void *, __off_t *, int);
 389 typedef int cookie_close_function_t(void *);
 390 typedef struct {
 391        cookie_read_function_t  *read;
 392        cookie_write_function_t *write;
 393        cookie_seek_function_t  *seek;
 394        cookie_close_function_t *close;
 395 } cookie_io_functions_t;
 396 FILE   *fopencookie(void *, const char *, cookie_io_functions_t);
 397 #endif /* __BSD_VISIBLE */
 398
 399 /*
 400  * Functions internal to the implementation.
 401  */
 402 int     __srget(FILE *);
 403 int     __swbuf(int, FILE *);
 404
 405 /*
 406  * The __sfoo functions are here so that we can
 407  * define real function versions in the C library.
 408  */
 409 static __inline __always_inline int
 410 __sgetc(FILE *_fp)
 411 {
 412         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 413
 414         if (--_p->_r < 0)
 415                 return (__srget(_fp));
 416         else
 417                 return (*_p->_p++);
 418 }
 419
 420 static __inline __always_inline int
 421 __sputc(int _c, FILE *_fp)
 422 {
 423         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 424
 425         if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && _c != '\n'))
 426                 return (*_p->_p++ = _c);
 427         else
 428                 return (__swbuf(_c, _fp));
 429 }
 430
 431 static __inline __always_inline int
 432 __sfeof(FILE *_fp)
 433 {
 434         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 435
 436         return ((_p->_flags & __SEOF) != 0);
 437 }
 438
 439 static __inline __always_inline int
 440 __sferror(FILE *_fp)
 441 {
 442         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 443
 444         return ((_p->_flags & __SERR) != 0);
 445 }
 446
 447 static __inline __always_inline void
 448 __sclearerr(FILE *_fp)
 449 {
 450         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 451
 452         _p->_flags &= ~(__SERR|__SEOF);
 453 }
 454
 455 static __inline __always_inline int
 456 __sfileno(FILE *_fp)
 457 {
 458         struct __FILE_public *_p = (struct __FILE_public *)_fp;
 459
 460         return (_p->_fileno);
 461 }
 462
 463 #ifndef __LIBC_ISTHREADED_DECLARED
 464 #define __LIBC_ISTHREADED_DECLARED
 465 extern int __isthreaded;
 466 #endif
 467
 468 #ifndef __cplusplus
 469 #define feof(p)         (!__isthreaded ? __sfeof(p) : (feof)(p))
 470 #define ferror(p)       (!__isthreaded ? __sferror(p) : (ferror)(p))
 471 #define clearerr(p)     (!__isthreaded ? __sclearerr(p) : (clearerr)(p))
 472
 473 #if __POSIX_VISIBLE
 474 #define fileno(p)       (!__isthreaded ? __sfileno(p) : (fileno)(p))
 475 #endif
 476
 477 #define getc(fp)        (!__isthreaded ? __sgetc(fp) : (getc)(fp))
 478 #define putc(x, fp)     (!__isthreaded ? __sputc(x, fp) : (putc)(x, fp))
 479
 480 #define getchar()       getc(stdin)
 481 #define putchar(x)      putc(x, stdout)
 482
 483 #if __BSD_VISIBLE
 484 /*
 485  * See ISO/IEC 9945-1 ANSI/IEEE Std 1003.1 Second Edition 1996-07-12
 486  * B.8.2.7 for the rationale behind the *_unlocked() macros.
 487  */
 488 #define clearerr_unlocked(p)    __sclearerr(p)
 489 #define feof_unlocked(p)        __sfeof(p)
 490 #define ferror_unlocked(p)      __sferror(p)
 491 #define fileno_unlocked(p)      __sfileno(p)
 492 #define fputc_unlocked(s, p)    __sputc(s, p)
 493 #endif
 494 #if __POSIX_VISIBLE >= 199506
 495 #define getc_unlocked(fp)       __sgetc(fp)
 496 #define putc_unlocked(x, fp)    __sputc(x, fp)
 497
 498 #define getchar_unlocked()      getc_unlocked(stdin)
 499 #define putchar_unlocked(x)     putc_unlocked(x, stdout)
 500 #endif
 501 #endif /* __cplusplus */
 502
 503 __END_DECLS
 504 #endif /* !_STDIO_H_ */