libio/stdio.h

   1 /* Define ISO C stdio on top of C++ iostreams.
   2    Copyright (C) 1991-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /*
  20  *      ISO C99 Standard: 7.19 Input/output     <stdio.h>
  21  */
  22
  23 #ifndef _STDIO_H
  24
  25 #if !defined __need_FILE && !defined __need___FILE
  26 # define _STDIO_H       1
  27 # define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
  28 # include <bits/libc-header-start.h>
  29
  30 __BEGIN_DECLS
  31
  32 # define __need_size_t
  33 # define __need_NULL
  34 # include <stddef.h>
  35
  36 # include <bits/types.h>
  37 # define __need_FILE
  38 # define __need___FILE
  39 #endif /* Don't need FILE.  */
  40
  41
  42 #if !defined __FILE_defined && defined __need_FILE
  43
  44 /* Define outside of namespace so the C++ is happy.  */
  45 struct _IO_FILE;
  46
  47 __BEGIN_NAMESPACE_STD
  48 /* The opaque type of streams.  This is the definition used elsewhere.  */
  49 typedef struct _IO_FILE FILE;
  50 __END_NAMESPACE_STD
  51 #if defined __USE_LARGEFILE64 || defined __USE_POSIX \
  52     || defined __USE_ISOC99 || defined __USE_XOPEN \
  53     || defined __USE_POSIX2
  54 __USING_NAMESPACE_STD(FILE)
  55 #endif
  56
  57 # define __FILE_defined 1
  58 #endif /* FILE not defined.  */
  59 #undef  __need_FILE
  60
  61
  62 #if !defined ____FILE_defined && defined __need___FILE
  63
  64 /* The opaque type of streams.  This is the definition used elsewhere.  */
  65 typedef struct _IO_FILE __FILE;
  66
  67 # define ____FILE_defined       1
  68 #endif /* __FILE not defined.  */
  69 #undef  __need___FILE
  70
  71
  72 #ifdef  _STDIO_H
  73 #define _STDIO_USES_IOSTREAM
  74
  75 #include <libio.h>
  76
  77 #if defined __USE_XOPEN || defined __USE_XOPEN2K8
  78 # ifdef __GNUC__
  79 #  ifndef _VA_LIST_DEFINED
  80 typedef _G_va_list va_list;
  81 #   define _VA_LIST_DEFINED
  82 #  endif
  83 # else
  84 #  include <stdarg.h>
  85 # endif
  86 #endif
  87
  88 #if defined __USE_UNIX98 || defined __USE_XOPEN2K
  89 # ifndef __off_t_defined
  90 # ifndef __USE_FILE_OFFSET64
  91 typedef __off_t off_t;
  92 # else
  93 typedef __off64_t off_t;
  94 # endif
  95 # define __off_t_defined
  96 # endif
  97 # if defined __USE_LARGEFILE64 && !defined __off64_t_defined
  98 typedef __off64_t off64_t;
  99 # define __off64_t_defined
 100 # endif
 101 #endif
 102
 103 #ifdef __USE_XOPEN2K8
 104 # ifndef __ssize_t_defined
 105 typedef __ssize_t ssize_t;
 106 # define __ssize_t_defined
 107 # endif
 108 #endif
 109
 110 /* The type of the second argument to `fgetpos' and `fsetpos'.  */
 111 __BEGIN_NAMESPACE_STD
 112 #ifndef __USE_FILE_OFFSET64
 113 typedef _G_fpos_t fpos_t;
 114 #else
 115 typedef _G_fpos64_t fpos_t;
 116 #endif
 117 __END_NAMESPACE_STD
 118 #ifdef __USE_LARGEFILE64
 119 typedef _G_fpos64_t fpos64_t;
 120 #endif
 121
 122 /* The possibilities for the third argument to `setvbuf'.  */
 123 #define _IOFBF 0                /* Fully buffered.  */
 124 #define _IOLBF 1                /* Line buffered.  */
 125 #define _IONBF 2                /* No buffering.  */
 126
 127
 128 /* Default buffer size.  */
 129 #ifndef BUFSIZ
 130 # define BUFSIZ _IO_BUFSIZ
 131 #endif
 132
 133
 134 /* End of file character.
 135    Some things throughout the library rely on this being -1.  */
 136 #ifndef EOF
 137 # define EOF (-1)
 138 #endif
 139
 140
 141 /* The possibilities for the third argument to `fseek'.
 142    These values should not be changed.  */
 143 #define SEEK_SET        0       /* Seek from beginning of file.  */
 144 #define SEEK_CUR        1       /* Seek from current position.  */
 145 #define SEEK_END        2       /* Seek from end of file.  */
 146 #ifdef __USE_GNU
 147 # define SEEK_DATA      3       /* Seek to next data.  */
 148 # define SEEK_HOLE      4       /* Seek to next hole.  */
 149 #endif
 150
 151
 152 #if defined __USE_MISC || defined __USE_XOPEN
 153 /* Default path prefix for `tempnam' and `tmpnam'.  */
 154 # define P_tmpdir       "/tmp"
 155 #endif
 156
 157
 158 /* Get the values:
 159    L_tmpnam     How long an array of chars must be to be passed to `tmpnam'.
 160    TMP_MAX      The minimum number of unique filenames generated by tmpnam
 161                 (and tempnam when it uses tmpnam's name space),
 162                 or tempnam (the two are separate).
 163    L_ctermid    How long an array to pass to `ctermid'.
 164    L_cuserid    How long an array to pass to `cuserid'.
 165    FOPEN_MAX    Minimum number of files that can be open at once.
 166    FILENAME_MAX Maximum length of a filename.  */
 167 #include <bits/stdio_lim.h>
 168
 169
 170 /* Standard streams.  */
 171 extern struct _IO_FILE *stdin;          /* Standard input stream.  */
 172 extern struct _IO_FILE *stdout;         /* Standard output stream.  */
 173 extern struct _IO_FILE *stderr;         /* Standard error output stream.  */
 174 /* C89/C99 say they're macros.  Make them happy.  */
 175 #define stdin stdin
 176 #define stdout stdout
 177 #define stderr stderr
 178
 179 __BEGIN_NAMESPACE_STD
 180 /* Remove file FILENAME.  */
 181 extern int remove (const char *__filename) __THROW;
 182 /* Rename file OLD to NEW.  */
 183 extern int rename (const char *__old, const char *__new) __THROW;
 184 __END_NAMESPACE_STD
 185
 186 #ifdef __USE_ATFILE
 187 /* Rename file OLD relative to OLDFD to NEW relative to NEWFD.  */
 188 extern int renameat (int __oldfd, const char *__old, int __newfd,
 189                      const char *__new) __THROW;
 190 #endif
 191
 192 __BEGIN_NAMESPACE_STD
 193 /* Create a temporary file and open it read/write.
 194
 195    This function is a possible cancellation point and therefore not
 196    marked with __THROW.  */
 197 #ifndef __USE_FILE_OFFSET64
 198 extern FILE *tmpfile (void) __wur;
 199 #else
 200 # ifdef __REDIRECT
 201 extern FILE *__REDIRECT (tmpfile, (void), tmpfile64) __wur;
 202 # else
 203 #  define tmpfile tmpfile64
 204 # endif
 205 #endif
 206
 207 #ifdef __USE_LARGEFILE64
 208 extern FILE *tmpfile64 (void) __wur;
 209 #endif
 210
 211 /* Generate a temporary filename.  */
 212 extern char *tmpnam (char *__s) __THROW __wur;
 213 __END_NAMESPACE_STD
 214
 215 #ifdef __USE_MISC
 216 /* This is the reentrant variant of `tmpnam'.  The only difference is
 217    that it does not allow S to be NULL.  */
 218 extern char *tmpnam_r (char *__s) __THROW __wur;
 219 #endif
 220
 221
 222 #if defined __USE_MISC || defined __USE_XOPEN
 223 /* Generate a unique temporary filename using up to five characters of PFX
 224    if it is not NULL.  The directory to put this file in is searched for
 225    as follows: First the environment variable "TMPDIR" is checked.
 226    If it contains the name of a writable directory, that directory is used.
 227    If not and if DIR is not NULL, that value is checked.  If that fails,
 228    P_tmpdir is tried and finally "/tmp".  The storage for the filename
 229    is allocated by `malloc'.  */
 230 extern char *tempnam (const char *__dir, const char *__pfx)
 231      __THROW __attribute_malloc__ __wur;
 232 #endif
 233
 234
 235 __BEGIN_NAMESPACE_STD
 236 /* Close STREAM.
 237
 238    This function is a possible cancellation point and therefore not
 239    marked with __THROW.  */
 240 extern int fclose (FILE *__stream);
 241 /* Flush STREAM, or all streams if STREAM is NULL.
 242
 243    This function is a possible cancellation point and therefore not
 244    marked with __THROW.  */
 245 extern int fflush (FILE *__stream);
 246 __END_NAMESPACE_STD
 247
 248 #ifdef __USE_MISC
 249 /* Faster versions when locking is not required.
 250
 251    This function is not part of POSIX and therefore no official
 252    cancellation point.  But due to similarity with an POSIX interface
 253    or due to the implementation it is a cancellation point and
 254    therefore not marked with __THROW.  */
 255 extern int fflush_unlocked (FILE *__stream);
 256 #endif
 257
 258 #ifdef __USE_GNU
 259 /* Close all streams.
 260
 261    This function is not part of POSIX and therefore no official
 262    cancellation point.  But due to similarity with an POSIX interface
 263    or due to the implementation it is a cancellation point and
 264    therefore not marked with __THROW.  */
 265 extern int fcloseall (void);
 266 #endif
 267
 268
 269 __BEGIN_NAMESPACE_STD
 270 #ifndef __USE_FILE_OFFSET64
 271 /* Open a file and create a new stream for it.
 272
 273    This function is a possible cancellation point and therefore not
 274    marked with __THROW.  */
 275 extern FILE *fopen (const char *__restrict __filename,
 276                     const char *__restrict __modes) __wur;
 277 /* Open a file, replacing an existing stream with it.
 278
 279    This function is a possible cancellation point and therefore not
 280    marked with __THROW.  */
 281 extern FILE *freopen (const char *__restrict __filename,
 282                       const char *__restrict __modes,
 283                       FILE *__restrict __stream) __wur;
 284 #else
 285 # ifdef __REDIRECT
 286 extern FILE *__REDIRECT (fopen, (const char *__restrict __filename,
 287                                  const char *__restrict __modes), fopen64)
 288   __wur;
 289 extern FILE *__REDIRECT (freopen, (const char *__restrict __filename,
 290                                    const char *__restrict __modes,
 291                                    FILE *__restrict __stream), freopen64)
 292   __wur;
 293 # else
 294 #  define fopen fopen64
 295 #  define freopen freopen64
 296 # endif
 297 #endif
 298 __END_NAMESPACE_STD
 299 #ifdef __USE_LARGEFILE64
 300 extern FILE *fopen64 (const char *__restrict __filename,
 301                       const char *__restrict __modes) __wur;
 302 extern FILE *freopen64 (const char *__restrict __filename,
 303                         const char *__restrict __modes,
 304                         FILE *__restrict __stream) __wur;
 305 #endif
 306
 307 #ifdef  __USE_POSIX
 308 /* Create a new stream that refers to an existing system file descriptor.  */
 309 extern FILE *fdopen (int __fd, const char *__modes) __THROW __wur;
 310 #endif
 311
 312 #ifdef  __USE_GNU
 313 /* Create a new stream that refers to the given magic cookie,
 314    and uses the given functions for input and output.  */
 315 extern FILE *fopencookie (void *__restrict __magic_cookie,
 316                           const char *__restrict __modes,
 317                           _IO_cookie_io_functions_t __io_funcs) __THROW __wur;
 318 #endif
 319
 320 #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2)
 321 /* Create a new stream that refers to a memory buffer.  */
 322 extern FILE *fmemopen (void *__s, size_t __len, const char *__modes)
 323   __THROW __wur;
 324
 325 /* Open a stream that writes into a malloc'd buffer that is expanded as
 326    necessary.  *BUFLOC and *SIZELOC are updated with the buffer's location
 327    and the number of characters written on fflush or fclose.  */
 328 extern FILE *open_memstream (char **__bufloc, size_t *__sizeloc) __THROW __wur;
 329 #endif
 330
 331
 332 __BEGIN_NAMESPACE_STD
 333 /* If BUF is NULL, make STREAM unbuffered.
 334    Else make it use buffer BUF, of size BUFSIZ.  */
 335 extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) __THROW;
 336 /* Make STREAM use buffering mode MODE.
 337    If BUF is not NULL, use N bytes of it for buffering;
 338    else allocate an internal buffer N bytes long.  */
 339 extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,
 340                     int __modes, size_t __n) __THROW;
 341 __END_NAMESPACE_STD
 342
 343 #ifdef  __USE_MISC
 344 /* If BUF is NULL, make STREAM unbuffered.
 345    Else make it use SIZE bytes of BUF for buffering.  */
 346 extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,
 347                        size_t __size) __THROW;
 348
 349 /* Make STREAM line-buffered.  */
 350 extern void setlinebuf (FILE *__stream) __THROW;
 351 #endif
 352
 353
 354 __BEGIN_NAMESPACE_STD
 355 /* Write formatted output to STREAM.
 356
 357    This function is a possible cancellation point and therefore not
 358    marked with __THROW.  */
 359 extern int fprintf (FILE *__restrict __stream,
 360                     const char *__restrict __format, ...);
 361 /* Write formatted output to stdout.
 362
 363    This function is a possible cancellation point and therefore not
 364    marked with __THROW.  */
 365 extern int printf (const char *__restrict __format, ...);
 366 /* Write formatted output to S.  */
 367 extern int sprintf (char *__restrict __s,
 368                     const char *__restrict __format, ...) __THROWNL;
 369
 370 /* Write formatted output to S from argument list ARG.
 371
 372    This function is a possible cancellation point and therefore not
 373    marked with __THROW.  */
 374 extern int vfprintf (FILE *__restrict __s, const char *__restrict __format,
 375                      _G_va_list __arg);
 376 /* Write formatted output to stdout from argument list ARG.
 377
 378    This function is a possible cancellation point and therefore not
 379    marked with __THROW.  */
 380 extern int vprintf (const char *__restrict __format, _G_va_list __arg);
 381 /* Write formatted output to S from argument list ARG.  */
 382 extern int vsprintf (char *__restrict __s, const char *__restrict __format,
 383                      _G_va_list __arg) __THROWNL;
 384 __END_NAMESPACE_STD
 385
 386 #if defined __USE_ISOC99 || defined __USE_UNIX98
 387 __BEGIN_NAMESPACE_C99
 388 /* Maximum chars of output to write in MAXLEN.  */
 389 extern int snprintf (char *__restrict __s, size_t __maxlen,
 390                      const char *__restrict __format, ...)
 391      __THROWNL __attribute__ ((__format__ (__printf__, 3, 4)));
 392
 393 extern int vsnprintf (char *__restrict __s, size_t __maxlen,
 394                       const char *__restrict __format, _G_va_list __arg)
 395      __THROWNL __attribute__ ((__format__ (__printf__, 3, 0)));
 396 __END_NAMESPACE_C99
 397 #endif
 398
 399 #if __GLIBC_USE (LIB_EXT2)
 400 /* Write formatted output to a string dynamically allocated with `malloc'.
 401    Store the address of the string in *PTR.  */
 402 extern int vasprintf (char **__restrict __ptr, const char *__restrict __f,
 403                       _G_va_list __arg)
 404      __THROWNL __attribute__ ((__format__ (__printf__, 2, 0))) __wur;
 405 extern int __asprintf (char **__restrict __ptr,
 406                        const char *__restrict __fmt, ...)
 407      __THROWNL __attribute__ ((__format__ (__printf__, 2, 3))) __wur;
 408 extern int asprintf (char **__restrict __ptr,
 409                      const char *__restrict __fmt, ...)
 410      __THROWNL __attribute__ ((__format__ (__printf__, 2, 3))) __wur;
 411 #endif
 412
 413 #ifdef __USE_XOPEN2K8
 414 /* Write formatted output to a file descriptor.  */
 415 extern int vdprintf (int __fd, const char *__restrict __fmt,
 416                      _G_va_list __arg)
 417      __attribute__ ((__format__ (__printf__, 2, 0)));
 418 extern int dprintf (int __fd, const char *__restrict __fmt, ...)
 419      __attribute__ ((__format__ (__printf__, 2, 3)));
 420 #endif
 421
 422
 423 __BEGIN_NAMESPACE_STD
 424 /* Read formatted input from STREAM.
 425
 426    This function is a possible cancellation point and therefore not
 427    marked with __THROW.  */
 428 extern int fscanf (FILE *__restrict __stream,
 429                    const char *__restrict __format, ...) __wur;
 430 /* Read formatted input from stdin.
 431
 432    This function is a possible cancellation point and therefore not
 433    marked with __THROW.  */
 434 extern int scanf (const char *__restrict __format, ...) __wur;
 435 /* Read formatted input from S.  */
 436 extern int sscanf (const char *__restrict __s,
 437                    const char *__restrict __format, ...) __THROW;
 438
 439 #if defined __USE_ISOC99 && !defined __USE_GNU \
 440     && (!defined __LDBL_COMPAT || !defined __REDIRECT) \
 441     && (defined __STRICT_ANSI__ || defined __USE_XOPEN2K)
 442 # ifdef __REDIRECT
 443 /* For strict ISO C99 or POSIX compliance disallow %as, %aS and %a[
 444    GNU extension which conflicts with valid %a followed by letter
 445    s, S or [.  */
 446 extern int __REDIRECT (fscanf, (FILE *__restrict __stream,
 447                                 const char *__restrict __format, ...),
 448                        __isoc99_fscanf) __wur;
 449 extern int __REDIRECT (scanf, (const char *__restrict __format, ...),
 450                        __isoc99_scanf) __wur;
 451 extern int __REDIRECT_NTH (sscanf, (const char *__restrict __s,
 452                                     const char *__restrict __format, ...),
 453                            __isoc99_sscanf);
 454 # else
 455 extern int __isoc99_fscanf (FILE *__restrict __stream,
 456                             const char *__restrict __format, ...) __wur;
 457 extern int __isoc99_scanf (const char *__restrict __format, ...) __wur;
 458 extern int __isoc99_sscanf (const char *__restrict __s,
 459                             const char *__restrict __format, ...) __THROW;
 460 #  define fscanf __isoc99_fscanf
 461 #  define scanf __isoc99_scanf
 462 #  define sscanf __isoc99_sscanf
 463 # endif
 464 #endif
 465
 466 __END_NAMESPACE_STD
 467
 468 #ifdef  __USE_ISOC99
 469 __BEGIN_NAMESPACE_C99
 470 /* Read formatted input from S into argument list ARG.
 471
 472    This function is a possible cancellation point and therefore not
 473    marked with __THROW.  */
 474 extern int vfscanf (FILE *__restrict __s, const char *__restrict __format,
 475                     _G_va_list __arg)
 476      __attribute__ ((__format__ (__scanf__, 2, 0))) __wur;
 477
 478 /* Read formatted input from stdin into argument list ARG.
 479
 480    This function is a possible cancellation point and therefore not
 481    marked with __THROW.  */
 482 extern int vscanf (const char *__restrict __format, _G_va_list __arg)
 483      __attribute__ ((__format__ (__scanf__, 1, 0))) __wur;
 484
 485 /* Read formatted input from S into argument list ARG.  */
 486 extern int vsscanf (const char *__restrict __s,
 487                     const char *__restrict __format, _G_va_list __arg)
 488      __THROW __attribute__ ((__format__ (__scanf__, 2, 0)));
 489
 490 # if !defined __USE_GNU \
 491      && (!defined __LDBL_COMPAT || !defined __REDIRECT) \
 492      && (defined __STRICT_ANSI__ || defined __USE_XOPEN2K)
 493 #  ifdef __REDIRECT
 494 /* For strict ISO C99 or POSIX compliance disallow %as, %aS and %a[
 495    GNU extension which conflicts with valid %a followed by letter
 496    s, S or [.  */
 497 extern int __REDIRECT (vfscanf,
 498                        (FILE *__restrict __s,
 499                         const char *__restrict __format, _G_va_list __arg),
 500                        __isoc99_vfscanf)
 501      __attribute__ ((__format__ (__scanf__, 2, 0))) __wur;
 502 extern int __REDIRECT (vscanf, (const char *__restrict __format,
 503                                 _G_va_list __arg), __isoc99_vscanf)
 504      __attribute__ ((__format__ (__scanf__, 1, 0))) __wur;
 505 extern int __REDIRECT_NTH (vsscanf,
 506                            (const char *__restrict __s,
 507                             const char *__restrict __format,
 508                             _G_va_list __arg), __isoc99_vsscanf)
 509      __attribute__ ((__format__ (__scanf__, 2, 0)));
 510 #  else
 511 extern int __isoc99_vfscanf (FILE *__restrict __s,
 512                              const char *__restrict __format,
 513                              _G_va_list __arg) __wur;
 514 extern int __isoc99_vscanf (const char *__restrict __format,
 515                             _G_va_list __arg) __wur;
 516 extern int __isoc99_vsscanf (const char *__restrict __s,
 517                              const char *__restrict __format,
 518                              _G_va_list __arg) __THROW;
 519 #   define vfscanf __isoc99_vfscanf
 520 #   define vscanf __isoc99_vscanf
 521 #   define vsscanf __isoc99_vsscanf
 522 #  endif
 523 # endif
 524
 525 __END_NAMESPACE_C99
 526 #endif /* Use ISO C9x.  */
 527
 528
 529 __BEGIN_NAMESPACE_STD
 530 /* Read a character from STREAM.
 531
 532    These functions are possible cancellation points and therefore not
 533    marked with __THROW.  */
 534 extern int fgetc (FILE *__stream);
 535 extern int getc (FILE *__stream);
 536
 537 /* Read a character from stdin.
 538
 539    This function is a possible cancellation point and therefore not
 540    marked with __THROW.  */
 541 extern int getchar (void);
 542 __END_NAMESPACE_STD
 543
 544 /* The C standard explicitly says this is a macro, so we always do the
 545    optimization for it.  */
 546 #define getc(_fp) _IO_getc (_fp)
 547
 548 #ifdef __USE_POSIX199506
 549 /* These are defined in POSIX.1:1996.
 550
 551    These functions are possible cancellation points and therefore not
 552    marked with __THROW.  */
 553 extern int getc_unlocked (FILE *__stream);
 554 extern int getchar_unlocked (void);
 555 #endif /* Use POSIX.  */
 556
 557 #ifdef __USE_MISC
 558 /* Faster version when locking is not necessary.
 559
 560    This function is not part of POSIX and therefore no official
 561    cancellation point.  But due to similarity with an POSIX interface
 562    or due to the implementation it is a cancellation point and
 563    therefore not marked with __THROW.  */
 564 extern int fgetc_unlocked (FILE *__stream);
 565 #endif /* Use MISC.  */
 566
 567
 568 __BEGIN_NAMESPACE_STD
 569 /* Write a character to STREAM.
 570
 571    These functions are possible cancellation points and therefore not
 572    marked with __THROW.
 573
 574    These functions is a possible cancellation point and therefore not
 575    marked with __THROW.  */
 576 extern int fputc (int __c, FILE *__stream);
 577 extern int putc (int __c, FILE *__stream);
 578
 579 /* Write a character to stdout.
 580
 581    This function is a possible cancellation point and therefore not
 582    marked with __THROW.  */
 583 extern int putchar (int __c);
 584 __END_NAMESPACE_STD
 585
 586 /* The C standard explicitly says this can be a macro,
 587    so we always do the optimization for it.  */
 588 #define putc(_ch, _fp) _IO_putc (_ch, _fp)
 589
 590 #ifdef __USE_MISC
 591 /* Faster version when locking is not necessary.
 592
 593    This function is not part of POSIX and therefore no official
 594    cancellation point.  But due to similarity with an POSIX interface
 595    or due to the implementation it is a cancellation point and
 596    therefore not marked with __THROW.  */
 597 extern int fputc_unlocked (int __c, FILE *__stream);
 598 #endif /* Use MISC.  */
 599
 600 #ifdef __USE_POSIX199506
 601 /* These are defined in POSIX.1:1996.
 602
 603    These functions are possible cancellation points and therefore not
 604    marked with __THROW.  */
 605 extern int putc_unlocked (int __c, FILE *__stream);
 606 extern int putchar_unlocked (int __c);
 607 #endif /* Use POSIX.  */
 608
 609
 610 #if defined __USE_MISC \
 611     || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
 612 /* Get a word (int) from STREAM.  */
 613 extern int getw (FILE *__stream);
 614
 615 /* Write a word (int) to STREAM.  */
 616 extern int putw (int __w, FILE *__stream);
 617 #endif
 618
 619
 620 __BEGIN_NAMESPACE_STD
 621 /* Get a newline-terminated string of finite length from STREAM.
 622
 623    This function is a possible cancellation point and therefore not
 624    marked with __THROW.  */
 625 extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
 626      __wur;
 627
 628 #if __GLIBC_USE (DEPRECATED_GETS)
 629 /* Get a newline-terminated string from stdin, removing the newline.
 630
 631    This function is impossible to use safely.  It has been officially
 632    removed from ISO C11 and ISO C++14, and we have also removed it
 633    from the _GNU_SOURCE feature list.  It remains available when
 634    explicitly using an old ISO C, Unix, or POSIX standard.
 635
 636    This function is a possible cancellation point and therefore not
 637    marked with __THROW.  */
 638 extern char *gets (char *__s) __wur __attribute_deprecated__;
 639 #endif
 640 __END_NAMESPACE_STD
 641
 642 #ifdef __USE_GNU
 643 /* This function does the same as `fgets' but does not lock the stream.
 644
 645    This function is not part of POSIX and therefore no official
 646    cancellation point.  But due to similarity with an POSIX interface
 647    or due to the implementation it is a cancellation point and
 648    therefore not marked with __THROW.  */
 649 extern char *fgets_unlocked (char *__restrict __s, int __n,
 650                              FILE *__restrict __stream) __wur;
 651 #endif
 652
 653
 654 #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2)
 655 /* Read up to (and including) a DELIMITER from STREAM into *LINEPTR
 656    (and null-terminate it). *LINEPTR is a pointer returned from malloc (or
 657    NULL), pointing to *N characters of space.  It is realloc'd as
 658    necessary.  Returns the number of characters read (not including the
 659    null terminator), or -1 on error or EOF.
 660
 661    These functions are not part of POSIX and therefore no official
 662    cancellation point.  But due to similarity with an POSIX interface
 663    or due to the implementation they are cancellation points and
 664    therefore not marked with __THROW.  */
 665 extern _IO_ssize_t __getdelim (char **__restrict __lineptr,
 666                                size_t *__restrict __n, int __delimiter,
 667                                FILE *__restrict __stream) __wur;
 668 extern _IO_ssize_t getdelim (char **__restrict __lineptr,
 669                              size_t *__restrict __n, int __delimiter,
 670                              FILE *__restrict __stream) __wur;
 671
 672 /* Like `getdelim', but reads up to a newline.
 673
 674    This function is not part of POSIX and therefore no official
 675    cancellation point.  But due to similarity with an POSIX interface
 676    or due to the implementation it is a cancellation point and
 677    therefore not marked with __THROW.  */
 678 extern _IO_ssize_t getline (char **__restrict __lineptr,
 679                             size_t *__restrict __n,
 680                             FILE *__restrict __stream) __wur;
 681 #endif
 682
 683
 684 __BEGIN_NAMESPACE_STD
 685 /* Write a string to STREAM.
 686
 687    This function is a possible cancellation point and therefore not
 688    marked with __THROW.  */
 689 extern int fputs (const char *__restrict __s, FILE *__restrict __stream);
 690
 691 /* Write a string, followed by a newline, to stdout.
 692
 693    This function is a possible cancellation point and therefore not
 694    marked with __THROW.  */
 695 extern int puts (const char *__s);
 696
 697
 698 /* Push a character back onto the input buffer of STREAM.
 699
 700    This function is a possible cancellation point and therefore not
 701    marked with __THROW.  */
 702 extern int ungetc (int __c, FILE *__stream);
 703
 704
 705 /* Read chunks of generic data from STREAM.
 706
 707    This function is a possible cancellation point and therefore not
 708    marked with __THROW.  */
 709 extern size_t fread (void *__restrict __ptr, size_t __size,
 710                      size_t __n, FILE *__restrict __stream) __wur;
 711 /* Write chunks of generic data to STREAM.
 712
 713    This function is a possible cancellation point and therefore not
 714    marked with __THROW.  */
 715 extern size_t fwrite (const void *__restrict __ptr, size_t __size,
 716                       size_t __n, FILE *__restrict __s);
 717 __END_NAMESPACE_STD
 718
 719 #ifdef __USE_GNU
 720 /* This function does the same as `fputs' but does not lock the stream.
 721
 722    This function is not part of POSIX and therefore no official
 723    cancellation point.  But due to similarity with an POSIX interface
 724    or due to the implementation it is a cancellation point and
 725    therefore not marked with __THROW.  */
 726 extern int fputs_unlocked (const char *__restrict __s,
 727                            FILE *__restrict __stream);
 728 #endif
 729
 730 #ifdef __USE_MISC
 731 /* Faster versions when locking is not necessary.
 732
 733    These functions are not part of POSIX and therefore no official
 734    cancellation point.  But due to similarity with an POSIX interface
 735    or due to the implementation they are cancellation points and
 736    therefore not marked with __THROW.  */
 737 extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,
 738                               size_t __n, FILE *__restrict __stream) __wur;
 739 extern size_t fwrite_unlocked (const void *__restrict __ptr, size_t __size,
 740                                size_t __n, FILE *__restrict __stream);
 741 #endif
 742
 743
 744 __BEGIN_NAMESPACE_STD
 745 /* Seek to a certain position on STREAM.
 746
 747    This function is a possible cancellation point and therefore not
 748    marked with __THROW.  */
 749 extern int fseek (FILE *__stream, long int __off, int __whence);
 750 /* Return the current position of STREAM.
 751
 752    This function is a possible cancellation point and therefore not
 753    marked with __THROW.  */
 754 extern long int ftell (FILE *__stream) __wur;
 755 /* Rewind to the beginning of STREAM.
 756
 757    This function is a possible cancellation point and therefore not
 758    marked with __THROW.  */
 759 extern void rewind (FILE *__stream);
 760 __END_NAMESPACE_STD
 761
 762 /* The Single Unix Specification, Version 2, specifies an alternative,
 763    more adequate interface for the two functions above which deal with
 764    file offset.  `long int' is not the right type.  These definitions
 765    are originally defined in the Large File Support API.  */
 766
 767 #if defined __USE_LARGEFILE || defined __USE_XOPEN2K
 768 # ifndef __USE_FILE_OFFSET64
 769 /* Seek to a certain position on STREAM.
 770
 771    This function is a possible cancellation point and therefore not
 772    marked with __THROW.  */
 773 extern int fseeko (FILE *__stream, __off_t __off, int __whence);
 774 /* Return the current position of STREAM.
 775
 776    This function is a possible cancellation point and therefore not
 777    marked with __THROW.  */
 778 extern __off_t ftello (FILE *__stream) __wur;
 779 # else
 780 #  ifdef __REDIRECT
 781 extern int __REDIRECT (fseeko,
 782                        (FILE *__stream, __off64_t __off, int __whence),
 783                        fseeko64);
 784 extern __off64_t __REDIRECT (ftello, (FILE *__stream), ftello64);
 785 #  else
 786 #   define fseeko fseeko64
 787 #   define ftello ftello64
 788 #  endif
 789 # endif
 790 #endif
 791
 792 __BEGIN_NAMESPACE_STD
 793 #ifndef __USE_FILE_OFFSET64
 794 /* Get STREAM's position.
 795
 796    This function is a possible cancellation point and therefore not
 797    marked with __THROW.  */
 798 extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos);
 799 /* Set STREAM's position.
 800
 801    This function is a possible cancellation point and therefore not
 802    marked with __THROW.  */
 803 extern int fsetpos (FILE *__stream, const fpos_t *__pos);
 804 #else
 805 # ifdef __REDIRECT
 806 extern int __REDIRECT (fgetpos, (FILE *__restrict __stream,
 807                                  fpos_t *__restrict __pos), fgetpos64);
 808 extern int __REDIRECT (fsetpos,
 809                        (FILE *__stream, const fpos_t *__pos), fsetpos64);
 810 # else
 811 #  define fgetpos fgetpos64
 812 #  define fsetpos fsetpos64
 813 # endif
 814 #endif
 815 __END_NAMESPACE_STD
 816
 817 #ifdef __USE_LARGEFILE64
 818 extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence);
 819 extern __off64_t ftello64 (FILE *__stream) __wur;
 820 extern int fgetpos64 (FILE *__restrict __stream, fpos64_t *__restrict __pos);
 821 extern int fsetpos64 (FILE *__stream, const fpos64_t *__pos);
 822 #endif
 823
 824 __BEGIN_NAMESPACE_STD
 825 /* Clear the error and EOF indicators for STREAM.  */
 826 extern void clearerr (FILE *__stream) __THROW;
 827 /* Return the EOF indicator for STREAM.  */
 828 extern int feof (FILE *__stream) __THROW __wur;
 829 /* Return the error indicator for STREAM.  */
 830 extern int ferror (FILE *__stream) __THROW __wur;
 831 __END_NAMESPACE_STD
 832
 833 #ifdef __USE_MISC
 834 /* Faster versions when locking is not required.  */
 835 extern void clearerr_unlocked (FILE *__stream) __THROW;
 836 extern int feof_unlocked (FILE *__stream) __THROW __wur;
 837 extern int ferror_unlocked (FILE *__stream) __THROW __wur;
 838 #endif
 839
 840
 841 __BEGIN_NAMESPACE_STD
 842 /* Print a message describing the meaning of the value of errno.
 843
 844    This function is a possible cancellation point and therefore not
 845    marked with __THROW.  */
 846 extern void perror (const char *__s);
 847 __END_NAMESPACE_STD
 848
 849 /* Provide the declarations for `sys_errlist' and `sys_nerr' if they
 850    are available on this system.  Even if available, these variables
 851    should not be used directly.  The `strerror' function provides
 852    all the necessary functionality.  */
 853 #include <bits/sys_errlist.h>
 854
 855
 856 #ifdef  __USE_POSIX
 857 /* Return the system file descriptor for STREAM.  */
 858 extern int fileno (FILE *__stream) __THROW __wur;
 859 #endif /* Use POSIX.  */
 860
 861 #ifdef __USE_MISC
 862 /* Faster version when locking is not required.  */
 863 extern int fileno_unlocked (FILE *__stream) __THROW __wur;
 864 #endif
 865
 866
 867 #ifdef __USE_POSIX2
 868 /* Create a new stream connected to a pipe running the given command.
 869
 870    This function is a possible cancellation point and therefore not
 871    marked with __THROW.  */
 872 extern FILE *popen (const char *__command, const char *__modes) __wur;
 873
 874 /* Close a stream opened by popen and return the status of its child.
 875
 876    This function is a possible cancellation point and therefore not
 877    marked with __THROW.  */
 878 extern int pclose (FILE *__stream);
 879 #endif
 880
 881
 882 #ifdef  __USE_POSIX
 883 /* Return the name of the controlling terminal.  */
 884 extern char *ctermid (char *__s) __THROW;
 885 #endif /* Use POSIX.  */
 886
 887
 888 #if (defined __USE_XOPEN && !defined __USE_XOPEN2K) || defined __USE_GNU
 889 /* Return the name of the current user.  */
 890 extern char *cuserid (char *__s);
 891 #endif /* Use X/Open, but not issue 6.  */
 892
 893
 894 #ifdef  __USE_GNU
 895 struct obstack;                 /* See <obstack.h>.  */
 896
 897 /* Write formatted output to an obstack.  */
 898 extern int obstack_printf (struct obstack *__restrict __obstack,
 899                            const char *__restrict __format, ...)
 900      __THROWNL __attribute__ ((__format__ (__printf__, 2, 3)));
 901 extern int obstack_vprintf (struct obstack *__restrict __obstack,
 902                             const char *__restrict __format,
 903                             _G_va_list __args)
 904      __THROWNL __attribute__ ((__format__ (__printf__, 2, 0)));
 905 #endif /* Use GNU.  */
 906
 907
 908 #ifdef __USE_POSIX199506
 909 /* These are defined in POSIX.1:1996.  */
 910
 911 /* Acquire ownership of STREAM.  */
 912 extern void flockfile (FILE *__stream) __THROW;
 913
 914 /* Try to acquire ownership of STREAM but do not block if it is not
 915    possible.  */
 916 extern int ftrylockfile (FILE *__stream) __THROW __wur;
 917
 918 /* Relinquish the ownership granted for STREAM.  */
 919 extern void funlockfile (FILE *__stream) __THROW;
 920 #endif /* POSIX */
 921
 922 #if defined __USE_XOPEN && !defined __USE_XOPEN2K && !defined __USE_GNU
 923 /* The X/Open standard requires some functions and variables to be
 924    declared here which do not belong into this header.  But we have to
 925    follow.  In GNU mode we don't do this nonsense.  */
 926 # define __need_getopt
 927 # include <getopt.h>
 928 #endif  /* X/Open, but not issue 6 and not for GNU.  */
 929
 930 /* If we are compiling with optimizing read this file.  It contains
 931    several optimizing inline functions and macros.  */
 932 #ifdef __USE_EXTERN_INLINES
 933 # include <bits/stdio.h>
 934 #endif
 935 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 936 # include <bits/stdio2.h>
 937 #endif
 938 #ifdef __LDBL_COMPAT
 939 # include <bits/stdio-ldbl.h>
 940 #endif
 941
 942 __END_DECLS
 943
 944 #endif /* <stdio.h> included.  */
 945
 946 #endif /* !_STDIO_H */