libio/stdio.h

   1 /* Define ISO C stdio on top of C++ iostreams.
   2    Copyright (C) 1991-2018 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 #define _STDIO_H        1
  25
  26 #define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
  27 #include <bits/libc-header-start.h>
  28
  29 __BEGIN_DECLS
  30
  31 #define __need_size_t
  32 #define __need_NULL
  33 #include <stddef.h>
  34
  35 #define __need___va_list
  36 #include <stdarg.h>
  37
  38 #include <bits/types.h>
  39 #include <bits/types/__fpos_t.h>
  40 #include <bits/types/__fpos64_t.h>
  41 #include <bits/types/__FILE.h>
  42 #include <bits/types/FILE.h>
  43 #include <bits/types/struct_FILE.h>
  44
  45 #ifdef __USE_GNU
  46 # include <bits/types/cookie_io_functions_t.h>
  47 #endif
  48
  49 #if defined __USE_XOPEN || defined __USE_XOPEN2K8
  50 # ifdef __GNUC__
  51 #  ifndef _VA_LIST_DEFINED
  52 typedef __gnuc_va_list va_list;
  53 #   define _VA_LIST_DEFINED
  54 #  endif
  55 # else
  56 #  include <stdarg.h>
  57 # endif
  58 #endif
  59
  60 #if defined __USE_UNIX98 || defined __USE_XOPEN2K
  61 # ifndef __off_t_defined
  62 # ifndef __USE_FILE_OFFSET64
  63 typedef __off_t off_t;
  64 # else
  65 typedef __off64_t off_t;
  66 # endif
  67 # define __off_t_defined
  68 # endif
  69 # if defined __USE_LARGEFILE64 && !defined __off64_t_defined
  70 typedef __off64_t off64_t;
  71 # define __off64_t_defined
  72 # endif
  73 #endif
  74
  75 #ifdef __USE_XOPEN2K8
  76 # ifndef __ssize_t_defined
  77 typedef __ssize_t ssize_t;
  78 # define __ssize_t_defined
  79 # endif
  80 #endif
  81
  82 /* The type of the second argument to `fgetpos' and `fsetpos'.  */
  83 #ifndef __USE_FILE_OFFSET64
  84 typedef __fpos_t fpos_t;
  85 #else
  86 typedef __fpos64_t fpos_t;
  87 #endif
  88 #ifdef __USE_LARGEFILE64
  89 typedef __fpos64_t fpos64_t;
  90 #endif
  91
  92 /* The possibilities for the third argument to `setvbuf'.  */
  93 #define _IOFBF 0                /* Fully buffered.  */
  94 #define _IOLBF 1                /* Line buffered.  */
  95 #define _IONBF 2                /* No buffering.  */
  96
  97
  98 /* Default buffer size.  */
  99 #define BUFSIZ 8192
 100
 101
 102 /* The value returned by fgetc and similar functions to indicate the
 103    end of the file.  */
 104 #define EOF (-1)
 105
 106
 107 /* The possibilities for the third argument to `fseek'.
 108    These values should not be changed.  */
 109 #define SEEK_SET        0       /* Seek from beginning of file.  */
 110 #define SEEK_CUR        1       /* Seek from current position.  */
 111 #define SEEK_END        2       /* Seek from end of file.  */
 112 #ifdef __USE_GNU
 113 # define SEEK_DATA      3       /* Seek to next data.  */
 114 # define SEEK_HOLE      4       /* Seek to next hole.  */
 115 #endif
 116
 117
 118 #if defined __USE_MISC || defined __USE_XOPEN
 119 /* Default path prefix for `tempnam' and `tmpnam'.  */
 120 # define P_tmpdir       "/tmp"
 121 #endif
 122
 123
 124 /* Get the values:
 125    L_tmpnam     How long an array of chars must be to be passed to `tmpnam'.
 126    TMP_MAX      The minimum number of unique filenames generated by tmpnam
 127                 (and tempnam when it uses tmpnam's name space),
 128                 or tempnam (the two are separate).
 129    L_ctermid    How long an array to pass to `ctermid'.
 130    L_cuserid    How long an array to pass to `cuserid'.
 131    FOPEN_MAX    Minimum number of files that can be open at once.
 132    FILENAME_MAX Maximum length of a filename.  */
 133 #include <bits/stdio_lim.h>
 134
 135
 136 /* Standard streams.  */
 137 extern FILE *stdin;             /* Standard input stream.  */
 138 extern FILE *stdout;            /* Standard output stream.  */
 139 extern FILE *stderr;            /* Standard error output stream.  */
 140 /* C89/C99 say they're macros.  Make them happy.  */
 141 #define stdin stdin
 142 #define stdout stdout
 143 #define stderr stderr
 144
 145 /* Remove file FILENAME.  */
 146 extern int remove (const char *__filename) __THROW;
 147 /* Rename file OLD to NEW.  */
 148 extern int rename (const char *__old, const char *__new) __THROW;
 149
 150 #ifdef __USE_ATFILE
 151 /* Rename file OLD relative to OLDFD to NEW relative to NEWFD.  */
 152 extern int renameat (int __oldfd, const char *__old, int __newfd,
 153                      const char *__new) __THROW;
 154 #endif
 155
 156 #ifdef __USE_GNU
 157 /* Flags for renameat2.  */
 158 # define RENAME_NOREPLACE (1 << 0)
 159 # define RENAME_EXCHANGE (1 << 1)
 160 # define RENAME_WHITEOUT (1 << 2)
 161
 162 /* Rename file OLD relative to OLDFD to NEW relative to NEWFD, with
 163    additional flags.  */
 164 extern int renameat2 (int __oldfd, const char *__old, int __newfd,
 165                       const char *__new, unsigned int __flags) __THROW;
 166 #endif
 167
 168 /* Create a temporary file and open it read/write.
 169
 170    This function is a possible cancellation point and therefore not
 171    marked with __THROW.  */
 172 #ifndef __USE_FILE_OFFSET64
 173 extern FILE *tmpfile (void) __wur;
 174 #else
 175 # ifdef __REDIRECT
 176 extern FILE *__REDIRECT (tmpfile, (void), tmpfile64) __wur;
 177 # else
 178 #  define tmpfile tmpfile64
 179 # endif
 180 #endif
 181
 182 #ifdef __USE_LARGEFILE64
 183 extern FILE *tmpfile64 (void) __wur;
 184 #endif
 185
 186 /* Generate a temporary filename.  */
 187 extern char *tmpnam (char *__s) __THROW __wur;
 188
 189 #ifdef __USE_MISC
 190 /* This is the reentrant variant of `tmpnam'.  The only difference is
 191    that it does not allow S to be NULL.  */
 192 extern char *tmpnam_r (char *__s) __THROW __wur;
 193 #endif
 194
 195
 196 #if defined __USE_MISC || defined __USE_XOPEN
 197 /* Generate a unique temporary filename using up to five characters of PFX
 198    if it is not NULL.  The directory to put this file in is searched for
 199    as follows: First the environment variable "TMPDIR" is checked.
 200    If it contains the name of a writable directory, that directory is used.
 201    If not and if DIR is not NULL, that value is checked.  If that fails,
 202    P_tmpdir is tried and finally "/tmp".  The storage for the filename
 203    is allocated by `malloc'.  */
 204 extern char *tempnam (const char *__dir, const char *__pfx)
 205      __THROW __attribute_malloc__ __wur;
 206 #endif
 207
 208
 209 /* Close STREAM.
 210
 211    This function is a possible cancellation point and therefore not
 212    marked with __THROW.  */
 213 extern int fclose (FILE *__stream);
 214 /* Flush STREAM, or all streams if STREAM is NULL.
 215
 216    This function is a possible cancellation point and therefore not
 217    marked with __THROW.  */
 218 extern int fflush (FILE *__stream);
 219
 220 #ifdef __USE_MISC
 221 /* Faster versions when locking is not required.
 222
 223    This function is not part of POSIX and therefore no official
 224    cancellation point.  But due to similarity with an POSIX interface
 225    or due to the implementation it is a cancellation point and
 226    therefore not marked with __THROW.  */
 227 extern int fflush_unlocked (FILE *__stream);
 228 #endif
 229
 230 #ifdef __USE_GNU
 231 /* Close all streams.
 232
 233    This function is not part of POSIX and therefore no official
 234    cancellation point.  But due to similarity with an POSIX interface
 235    or due to the implementation it is a cancellation point and
 236    therefore not marked with __THROW.  */
 237 extern int fcloseall (void);
 238 #endif
 239
 240
 241 #ifndef __USE_FILE_OFFSET64
 242 /* Open a file and create a new stream for it.
 243
 244    This function is a possible cancellation point and therefore not
 245    marked with __THROW.  */
 246 extern FILE *fopen (const char *__restrict __filename,
 247                     const char *__restrict __modes) __wur;
 248 /* Open a file, replacing an existing stream with it.
 249
 250    This function is a possible cancellation point and therefore not
 251    marked with __THROW.  */
 252 extern FILE *freopen (const char *__restrict __filename,
 253                       const char *__restrict __modes,
 254                       FILE *__restrict __stream) __wur;
 255 #else
 256 # ifdef __REDIRECT
 257 extern FILE *__REDIRECT (fopen, (const char *__restrict __filename,
 258                                  const char *__restrict __modes), fopen64)
 259   __wur;
 260 extern FILE *__REDIRECT (freopen, (const char *__restrict __filename,
 261                                    const char *__restrict __modes,
 262                                    FILE *__restrict __stream), freopen64)
 263   __wur;
 264 # else
 265 #  define fopen fopen64
 266 #  define freopen freopen64
 267 # endif
 268 #endif
 269 #ifdef __USE_LARGEFILE64
 270 extern FILE *fopen64 (const char *__restrict __filename,
 271                       const char *__restrict __modes) __wur;
 272 extern FILE *freopen64 (const char *__restrict __filename,
 273                         const char *__restrict __modes,
 274                         FILE *__restrict __stream) __wur;
 275 #endif
 276
 277 #ifdef  __USE_POSIX
 278 /* Create a new stream that refers to an existing system file descriptor.  */
 279 extern FILE *fdopen (int __fd, const char *__modes) __THROW __wur;
 280 #endif
 281
 282 #ifdef  __USE_GNU
 283 /* Create a new stream that refers to the given magic cookie,
 284    and uses the given functions for input and output.  */
 285 extern FILE *fopencookie (void *__restrict __magic_cookie,
 286                           const char *__restrict __modes,
 287                           cookie_io_functions_t __io_funcs) __THROW __wur;
 288 #endif
 289
 290 #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2)
 291 /* Create a new stream that refers to a memory buffer.  */
 292 extern FILE *fmemopen (void *__s, size_t __len, const char *__modes)
 293   __THROW __wur;
 294
 295 /* Open a stream that writes into a malloc'd buffer that is expanded as
 296    necessary.  *BUFLOC and *SIZELOC are updated with the buffer's location
 297    and the number of characters written on fflush or fclose.  */
 298 extern FILE *open_memstream (char **__bufloc, size_t *__sizeloc) __THROW __wur;
 299 #endif
 300
 301
 302 /* If BUF is NULL, make STREAM unbuffered.
 303    Else make it use buffer BUF, of size BUFSIZ.  */
 304 extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) __THROW;
 305 /* Make STREAM use buffering mode MODE.
 306    If BUF is not NULL, use N bytes of it for buffering;
 307    else allocate an internal buffer N bytes long.  */
 308 extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,
 309                     int __modes, size_t __n) __THROW;
 310
 311 #ifdef  __USE_MISC
 312 /* If BUF is NULL, make STREAM unbuffered.
 313    Else make it use SIZE bytes of BUF for buffering.  */
 314 extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,
 315                        size_t __size) __THROW;
 316
 317 /* Make STREAM line-buffered.  */
 318 extern void setlinebuf (FILE *__stream) __THROW;
 319 #endif
 320
 321
 322 /* Write formatted output to STREAM.
 323
 324    This function is a possible cancellation point and therefore not
 325    marked with __THROW.  */
 326 extern int fprintf (FILE *__restrict __stream,
 327                     const char *__restrict __format, ...);
 328 /* Write formatted output to stdout.
 329
 330    This function is a possible cancellation point and therefore not
 331    marked with __THROW.  */
 332 extern int printf (const char *__restrict __format, ...);
 333 /* Write formatted output to S.  */
 334 extern int sprintf (char *__restrict __s,
 335                     const char *__restrict __format, ...) __THROWNL;
 336
 337 /* Write formatted output to S from argument list ARG.
 338
 339    This function is a possible cancellation point and therefore not
 340    marked with __THROW.  */
 341 extern int vfprintf (FILE *__restrict __s, const char *__restrict __format,
 342                      __gnuc_va_list __arg);
 343 /* Write formatted output to stdout from argument list ARG.
 344
 345    This function is a possible cancellation point and therefore not
 346    marked with __THROW.  */
 347 extern int vprintf (const char *__restrict __format, __gnuc_va_list __arg);
 348 /* Write formatted output to S from argument list ARG.  */
 349 extern int vsprintf (char *__restrict __s, const char *__restrict __format,
 350                      __gnuc_va_list __arg) __THROWNL;
 351
 352 #if defined __USE_ISOC99 || defined __USE_UNIX98
 353 /* Maximum chars of output to write in MAXLEN.  */
 354 extern int snprintf (char *__restrict __s, size_t __maxlen,
 355                      const char *__restrict __format, ...)
 356      __THROWNL __attribute__ ((__format__ (__printf__, 3, 4)));
 357
 358 extern int vsnprintf (char *__restrict __s, size_t __maxlen,
 359                       const char *__restrict __format, __gnuc_va_list __arg)
 360      __THROWNL __attribute__ ((__format__ (__printf__, 3, 0)));
 361 #endif
 362
 363 #if __GLIBC_USE (LIB_EXT2)
 364 /* Write formatted output to a string dynamically allocated with `malloc'.
 365    Store the address of the string in *PTR.  */
 366 extern int vasprintf (char **__restrict __ptr, const char *__restrict __f,
 367                       __gnuc_va_list __arg)
 368      __THROWNL __attribute__ ((__format__ (__printf__, 2, 0))) __wur;
 369 extern int __asprintf (char **__restrict __ptr,
 370                        const char *__restrict __fmt, ...)
 371      __THROWNL __attribute__ ((__format__ (__printf__, 2, 3))) __wur;
 372 extern int asprintf (char **__restrict __ptr,
 373                      const char *__restrict __fmt, ...)
 374      __THROWNL __attribute__ ((__format__ (__printf__, 2, 3))) __wur;
 375 #endif
 376
 377 #ifdef __USE_XOPEN2K8
 378 /* Write formatted output to a file descriptor.  */
 379 extern int vdprintf (int __fd, const char *__restrict __fmt,
 380                      __gnuc_va_list __arg)
 381      __attribute__ ((__format__ (__printf__, 2, 0)));
 382 extern int dprintf (int __fd, const char *__restrict __fmt, ...)
 383      __attribute__ ((__format__ (__printf__, 2, 3)));
 384 #endif
 385
 386
 387 /* Read formatted input from STREAM.
 388
 389    This function is a possible cancellation point and therefore not
 390    marked with __THROW.  */
 391 extern int fscanf (FILE *__restrict __stream,
 392                    const char *__restrict __format, ...) __wur;
 393 /* Read formatted input from stdin.
 394
 395    This function is a possible cancellation point and therefore not
 396    marked with __THROW.  */
 397 extern int scanf (const char *__restrict __format, ...) __wur;
 398 /* Read formatted input from S.  */
 399 extern int sscanf (const char *__restrict __s,
 400                    const char *__restrict __format, ...) __THROW;
 401
 402 #if defined __USE_ISOC99 && !defined __USE_GNU \
 403     && (!defined __LDBL_COMPAT || !defined __REDIRECT) \
 404     && (defined __STRICT_ANSI__ || defined __USE_XOPEN2K)
 405 # ifdef __REDIRECT
 406 /* For strict ISO C99 or POSIX compliance disallow %as, %aS and %a[
 407    GNU extension which conflicts with valid %a followed by letter
 408    s, S or [.  */
 409 extern int __REDIRECT (fscanf, (FILE *__restrict __stream,
 410                                 const char *__restrict __format, ...),
 411                        __isoc99_fscanf) __wur;
 412 extern int __REDIRECT (scanf, (const char *__restrict __format, ...),
 413                        __isoc99_scanf) __wur;
 414 extern int __REDIRECT_NTH (sscanf, (const char *__restrict __s,
 415                                     const char *__restrict __format, ...),
 416                            __isoc99_sscanf);
 417 # else
 418 extern int __isoc99_fscanf (FILE *__restrict __stream,
 419                             const char *__restrict __format, ...) __wur;
 420 extern int __isoc99_scanf (const char *__restrict __format, ...) __wur;
 421 extern int __isoc99_sscanf (const char *__restrict __s,
 422                             const char *__restrict __format, ...) __THROW;
 423 #  define fscanf __isoc99_fscanf
 424 #  define scanf __isoc99_scanf
 425 #  define sscanf __isoc99_sscanf
 426 # endif
 427 #endif
 428
 429 #ifdef  __USE_ISOC99
 430 /* Read formatted input from S into argument list ARG.
 431
 432    This function is a possible cancellation point and therefore not
 433    marked with __THROW.  */
 434 extern int vfscanf (FILE *__restrict __s, const char *__restrict __format,
 435                     __gnuc_va_list __arg)
 436      __attribute__ ((__format__ (__scanf__, 2, 0))) __wur;
 437
 438 /* Read formatted input from stdin into argument list ARG.
 439
 440    This function is a possible cancellation point and therefore not
 441    marked with __THROW.  */
 442 extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg)
 443      __attribute__ ((__format__ (__scanf__, 1, 0))) __wur;
 444
 445 /* Read formatted input from S into argument list ARG.  */
 446 extern int vsscanf (const char *__restrict __s,
 447                     const char *__restrict __format, __gnuc_va_list __arg)
 448      __THROW __attribute__ ((__format__ (__scanf__, 2, 0)));
 449
 450 # if !defined __USE_GNU \
 451      && (!defined __LDBL_COMPAT || !defined __REDIRECT) \
 452      && (defined __STRICT_ANSI__ || defined __USE_XOPEN2K)
 453 #  ifdef __REDIRECT
 454 /* For strict ISO C99 or POSIX compliance disallow %as, %aS and %a[
 455    GNU extension which conflicts with valid %a followed by letter
 456    s, S or [.  */
 457 extern int __REDIRECT (vfscanf,
 458                        (FILE *__restrict __s,
 459                         const char *__restrict __format, __gnuc_va_list __arg),
 460                        __isoc99_vfscanf)
 461      __attribute__ ((__format__ (__scanf__, 2, 0))) __wur;
 462 extern int __REDIRECT (vscanf, (const char *__restrict __format,
 463                                 __gnuc_va_list __arg), __isoc99_vscanf)
 464      __attribute__ ((__format__ (__scanf__, 1, 0))) __wur;
 465 extern int __REDIRECT_NTH (vsscanf,
 466                            (const char *__restrict __s,
 467                             const char *__restrict __format,
 468                             __gnuc_va_list __arg), __isoc99_vsscanf)
 469      __attribute__ ((__format__ (__scanf__, 2, 0)));
 470 #  else
 471 extern int __isoc99_vfscanf (FILE *__restrict __s,
 472                              const char *__restrict __format,
 473                              __gnuc_va_list __arg) __wur;
 474 extern int __isoc99_vscanf (const char *__restrict __format,
 475                             __gnuc_va_list __arg) __wur;
 476 extern int __isoc99_vsscanf (const char *__restrict __s,
 477                              const char *__restrict __format,
 478                              __gnuc_va_list __arg) __THROW;
 479 #   define vfscanf __isoc99_vfscanf
 480 #   define vscanf __isoc99_vscanf
 481 #   define vsscanf __isoc99_vsscanf
 482 #  endif
 483 # endif
 484 #endif /* Use ISO C9x.  */
 485
 486
 487 /* Read a character from STREAM.
 488
 489    These functions are possible cancellation points and therefore not
 490    marked with __THROW.  */
 491 extern int fgetc (FILE *__stream);
 492 extern int getc (FILE *__stream);
 493
 494 /* Read a character from stdin.
 495
 496    This function is a possible cancellation point and therefore not
 497    marked with __THROW.  */
 498 extern int getchar (void);
 499
 500 #ifdef __USE_POSIX199506
 501 /* These are defined in POSIX.1:1996.
 502
 503    These functions are possible cancellation points and therefore not
 504    marked with __THROW.  */
 505 extern int getc_unlocked (FILE *__stream);
 506 extern int getchar_unlocked (void);
 507 #endif /* Use POSIX.  */
 508
 509 #ifdef __USE_MISC
 510 /* Faster version when locking is not necessary.
 511
 512    This function is not part of POSIX and therefore no official
 513    cancellation point.  But due to similarity with an POSIX interface
 514    or due to the implementation it is a cancellation point and
 515    therefore not marked with __THROW.  */
 516 extern int fgetc_unlocked (FILE *__stream);
 517 #endif /* Use MISC.  */
 518
 519
 520 /* Write a character to STREAM.
 521
 522    These functions are possible cancellation points and therefore not
 523    marked with __THROW.
 524
 525    These functions is a possible cancellation point and therefore not
 526    marked with __THROW.  */
 527 extern int fputc (int __c, FILE *__stream);
 528 extern int putc (int __c, FILE *__stream);
 529
 530 /* Write a character to stdout.
 531
 532    This function is a possible cancellation point and therefore not
 533    marked with __THROW.  */
 534 extern int putchar (int __c);
 535
 536 #ifdef __USE_MISC
 537 /* Faster version when locking is not necessary.
 538
 539    This function is not part of POSIX and therefore no official
 540    cancellation point.  But due to similarity with an POSIX interface
 541    or due to the implementation it is a cancellation point and
 542    therefore not marked with __THROW.  */
 543 extern int fputc_unlocked (int __c, FILE *__stream);
 544 #endif /* Use MISC.  */
 545
 546 #ifdef __USE_POSIX199506
 547 /* These are defined in POSIX.1:1996.
 548
 549    These functions are possible cancellation points and therefore not
 550    marked with __THROW.  */
 551 extern int putc_unlocked (int __c, FILE *__stream);
 552 extern int putchar_unlocked (int __c);
 553 #endif /* Use POSIX.  */
 554
 555
 556 #if defined __USE_MISC \
 557     || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
 558 /* Get a word (int) from STREAM.  */
 559 extern int getw (FILE *__stream);
 560
 561 /* Write a word (int) to STREAM.  */
 562 extern int putw (int __w, FILE *__stream);
 563 #endif
 564
 565
 566 /* Get a newline-terminated string of finite length from STREAM.
 567
 568    This function is a possible cancellation point and therefore not
 569    marked with __THROW.  */
 570 extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
 571      __wur;
 572
 573 #if __GLIBC_USE (DEPRECATED_GETS)
 574 /* Get a newline-terminated string from stdin, removing the newline.
 575
 576    This function is impossible to use safely.  It has been officially
 577    removed from ISO C11 and ISO C++14, and we have also removed it
 578    from the _GNU_SOURCE feature list.  It remains available when
 579    explicitly using an old ISO C, Unix, or POSIX standard.
 580
 581    This function is a possible cancellation point and therefore not
 582    marked with __THROW.  */
 583 extern char *gets (char *__s) __wur __attribute_deprecated__;
 584 #endif
 585
 586 #ifdef __USE_GNU
 587 /* This function does the same as `fgets' but does not lock the stream.
 588
 589    This function is not part of POSIX and therefore no official
 590    cancellation point.  But due to similarity with an POSIX interface
 591    or due to the implementation it is a cancellation point and
 592    therefore not marked with __THROW.  */
 593 extern char *fgets_unlocked (char *__restrict __s, int __n,
 594                              FILE *__restrict __stream) __wur;
 595 #endif
 596
 597
 598 #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2)
 599 /* Read up to (and including) a DELIMITER from STREAM into *LINEPTR
 600    (and null-terminate it). *LINEPTR is a pointer returned from malloc (or
 601    NULL), pointing to *N characters of space.  It is realloc'd as
 602    necessary.  Returns the number of characters read (not including the
 603    null terminator), or -1 on error or EOF.
 604
 605    These functions are not part of POSIX and therefore no official
 606    cancellation point.  But due to similarity with an POSIX interface
 607    or due to the implementation they are cancellation points and
 608    therefore not marked with __THROW.  */
 609 extern __ssize_t __getdelim (char **__restrict __lineptr,
 610                              size_t *__restrict __n, int __delimiter,
 611                              FILE *__restrict __stream) __wur;
 612 extern __ssize_t getdelim (char **__restrict __lineptr,
 613                            size_t *__restrict __n, int __delimiter,
 614                            FILE *__restrict __stream) __wur;
 615
 616 /* Like `getdelim', but reads up to a newline.
 617
 618    This function is not part of POSIX and therefore no official
 619    cancellation point.  But due to similarity with an POSIX interface
 620    or due to the implementation it is a cancellation point and
 621    therefore not marked with __THROW.  */
 622 extern __ssize_t getline (char **__restrict __lineptr,
 623                           size_t *__restrict __n,
 624                           FILE *__restrict __stream) __wur;
 625 #endif
 626
 627
 628 /* Write a string to STREAM.
 629
 630    This function is a possible cancellation point and therefore not
 631    marked with __THROW.  */
 632 extern int fputs (const char *__restrict __s, FILE *__restrict __stream);
 633
 634 /* Write a string, followed by a newline, to stdout.
 635
 636    This function is a possible cancellation point and therefore not
 637    marked with __THROW.  */
 638 extern int puts (const char *__s);
 639
 640
 641 /* Push a character back onto the input buffer of STREAM.
 642
 643    This function is a possible cancellation point and therefore not
 644    marked with __THROW.  */
 645 extern int ungetc (int __c, FILE *__stream);
 646
 647
 648 /* Read chunks of generic data from STREAM.
 649
 650    This function is a possible cancellation point and therefore not
 651    marked with __THROW.  */
 652 extern size_t fread (void *__restrict __ptr, size_t __size,
 653                      size_t __n, FILE *__restrict __stream) __wur;
 654 /* Write chunks of generic data to STREAM.
 655
 656    This function is a possible cancellation point and therefore not
 657    marked with __THROW.  */
 658 extern size_t fwrite (const void *__restrict __ptr, size_t __size,
 659                       size_t __n, FILE *__restrict __s);
 660
 661 #ifdef __USE_GNU
 662 /* This function does the same as `fputs' but does not lock the stream.
 663
 664    This function is not part of POSIX and therefore no official
 665    cancellation point.  But due to similarity with an POSIX interface
 666    or due to the implementation it is a cancellation point and
 667    therefore not marked with __THROW.  */
 668 extern int fputs_unlocked (const char *__restrict __s,
 669                            FILE *__restrict __stream);
 670 #endif
 671
 672 #ifdef __USE_MISC
 673 /* Faster versions when locking is not necessary.
 674
 675    These functions are not part of POSIX and therefore no official
 676    cancellation point.  But due to similarity with an POSIX interface
 677    or due to the implementation they are cancellation points and
 678    therefore not marked with __THROW.  */
 679 extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,
 680                               size_t __n, FILE *__restrict __stream) __wur;
 681 extern size_t fwrite_unlocked (const void *__restrict __ptr, size_t __size,
 682                                size_t __n, FILE *__restrict __stream);
 683 #endif
 684
 685
 686 /* Seek to a certain position on STREAM.
 687
 688    This function is a possible cancellation point and therefore not
 689    marked with __THROW.  */
 690 extern int fseek (FILE *__stream, long int __off, int __whence);
 691 /* Return the current position of STREAM.
 692
 693    This function is a possible cancellation point and therefore not
 694    marked with __THROW.  */
 695 extern long int ftell (FILE *__stream) __wur;
 696 /* Rewind to the beginning of STREAM.
 697
 698    This function is a possible cancellation point and therefore not
 699    marked with __THROW.  */
 700 extern void rewind (FILE *__stream);
 701
 702 /* The Single Unix Specification, Version 2, specifies an alternative,
 703    more adequate interface for the two functions above which deal with
 704    file offset.  `long int' is not the right type.  These definitions
 705    are originally defined in the Large File Support API.  */
 706
 707 #if defined __USE_LARGEFILE || defined __USE_XOPEN2K
 708 # ifndef __USE_FILE_OFFSET64
 709 /* Seek to a certain position on STREAM.
 710
 711    This function is a possible cancellation point and therefore not
 712    marked with __THROW.  */
 713 extern int fseeko (FILE *__stream, __off_t __off, int __whence);
 714 /* Return the current position of STREAM.
 715
 716    This function is a possible cancellation point and therefore not
 717    marked with __THROW.  */
 718 extern __off_t ftello (FILE *__stream) __wur;
 719 # else
 720 #  ifdef __REDIRECT
 721 extern int __REDIRECT (fseeko,
 722                        (FILE *__stream, __off64_t __off, int __whence),
 723                        fseeko64);
 724 extern __off64_t __REDIRECT (ftello, (FILE *__stream), ftello64);
 725 #  else
 726 #   define fseeko fseeko64
 727 #   define ftello ftello64
 728 #  endif
 729 # endif
 730 #endif
 731
 732 #ifndef __USE_FILE_OFFSET64
 733 /* Get STREAM's position.
 734
 735    This function is a possible cancellation point and therefore not
 736    marked with __THROW.  */
 737 extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos);
 738 /* Set STREAM's position.
 739
 740    This function is a possible cancellation point and therefore not
 741    marked with __THROW.  */
 742 extern int fsetpos (FILE *__stream, const fpos_t *__pos);
 743 #else
 744 # ifdef __REDIRECT
 745 extern int __REDIRECT (fgetpos, (FILE *__restrict __stream,
 746                                  fpos_t *__restrict __pos), fgetpos64);
 747 extern int __REDIRECT (fsetpos,
 748                        (FILE *__stream, const fpos_t *__pos), fsetpos64);
 749 # else
 750 #  define fgetpos fgetpos64
 751 #  define fsetpos fsetpos64
 752 # endif
 753 #endif
 754
 755 #ifdef __USE_LARGEFILE64
 756 extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence);
 757 extern __off64_t ftello64 (FILE *__stream) __wur;
 758 extern int fgetpos64 (FILE *__restrict __stream, fpos64_t *__restrict __pos);
 759 extern int fsetpos64 (FILE *__stream, const fpos64_t *__pos);
 760 #endif
 761
 762 /* Clear the error and EOF indicators for STREAM.  */
 763 extern void clearerr (FILE *__stream) __THROW;
 764 /* Return the EOF indicator for STREAM.  */
 765 extern int feof (FILE *__stream) __THROW __wur;
 766 /* Return the error indicator for STREAM.  */
 767 extern int ferror (FILE *__stream) __THROW __wur;
 768
 769 #ifdef __USE_MISC
 770 /* Faster versions when locking is not required.  */
 771 extern void clearerr_unlocked (FILE *__stream) __THROW;
 772 extern int feof_unlocked (FILE *__stream) __THROW __wur;
 773 extern int ferror_unlocked (FILE *__stream) __THROW __wur;
 774 #endif
 775
 776
 777 /* Print a message describing the meaning of the value of errno.
 778
 779    This function is a possible cancellation point and therefore not
 780    marked with __THROW.  */
 781 extern void perror (const char *__s);
 782
 783 /* Provide the declarations for `sys_errlist' and `sys_nerr' if they
 784    are available on this system.  Even if available, these variables
 785    should not be used directly.  The `strerror' function provides
 786    all the necessary functionality.  */
 787 #include <bits/sys_errlist.h>
 788
 789
 790 #ifdef  __USE_POSIX
 791 /* Return the system file descriptor for STREAM.  */
 792 extern int fileno (FILE *__stream) __THROW __wur;
 793 #endif /* Use POSIX.  */
 794
 795 #ifdef __USE_MISC
 796 /* Faster version when locking is not required.  */
 797 extern int fileno_unlocked (FILE *__stream) __THROW __wur;
 798 #endif
 799
 800
 801 #ifdef __USE_POSIX2
 802 /* Create a new stream connected to a pipe running the given command.
 803
 804    This function is a possible cancellation point and therefore not
 805    marked with __THROW.  */
 806 extern FILE *popen (const char *__command, const char *__modes) __wur;
 807
 808 /* Close a stream opened by popen and return the status of its child.
 809
 810    This function is a possible cancellation point and therefore not
 811    marked with __THROW.  */
 812 extern int pclose (FILE *__stream);
 813 #endif
 814
 815
 816 #ifdef  __USE_POSIX
 817 /* Return the name of the controlling terminal.  */
 818 extern char *ctermid (char *__s) __THROW;
 819 #endif /* Use POSIX.  */
 820
 821
 822 #if (defined __USE_XOPEN && !defined __USE_XOPEN2K) || defined __USE_GNU
 823 /* Return the name of the current user.  */
 824 extern char *cuserid (char *__s);
 825 #endif /* Use X/Open, but not issue 6.  */
 826
 827
 828 #ifdef  __USE_GNU
 829 struct obstack;                 /* See <obstack.h>.  */
 830
 831 /* Write formatted output to an obstack.  */
 832 extern int obstack_printf (struct obstack *__restrict __obstack,
 833                            const char *__restrict __format, ...)
 834      __THROWNL __attribute__ ((__format__ (__printf__, 2, 3)));
 835 extern int obstack_vprintf (struct obstack *__restrict __obstack,
 836                             const char *__restrict __format,
 837                             __gnuc_va_list __args)
 838      __THROWNL __attribute__ ((__format__ (__printf__, 2, 0)));
 839 #endif /* Use GNU.  */
 840
 841
 842 #ifdef __USE_POSIX199506
 843 /* These are defined in POSIX.1:1996.  */
 844
 845 /* Acquire ownership of STREAM.  */
 846 extern void flockfile (FILE *__stream) __THROW;
 847
 848 /* Try to acquire ownership of STREAM but do not block if it is not
 849    possible.  */
 850 extern int ftrylockfile (FILE *__stream) __THROW __wur;
 851
 852 /* Relinquish the ownership granted for STREAM.  */
 853 extern void funlockfile (FILE *__stream) __THROW;
 854 #endif /* POSIX */
 855
 856 #if defined __USE_XOPEN && !defined __USE_XOPEN2K && !defined __USE_GNU
 857 /*  X/Open Issues 1-5 required getopt to be declared in this
 858    header.  It was removed in Issue 6.  GNU follows Issue 6.  */
 859 # include <bits/getopt_posix.h>
 860 #endif
 861
 862 /* Slow-path routines used by the optimized inline functions in
 863    bits/stdio.h.  */
 864 extern int __uflow (FILE *);
 865 extern int __overflow (FILE *, int);
 866
 867 /* If we are compiling with optimizing read this file.  It contains
 868    several optimizing inline functions and macros.  */
 869 #ifdef __USE_EXTERN_INLINES
 870 # include <bits/stdio.h>
 871 #endif
 872 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 873 # include <bits/stdio2.h>
 874 #endif
 875 #ifdef __LDBL_COMPAT
 876 # include <bits/stdio-ldbl.h>
 877 #endif
 878
 879 __END_DECLS
 880
 881 #endif /* <stdio.h> included.  */