libio/stdio.h

   1 /* Define ISO C stdio on top of C++ iostreams.
   2    Copyright (C) 1991-2022 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    <https://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 #if __GLIBC_USE (ISOC2X)
 137 /* Maximum length of printf output for a NaN.  */
 138 # define _PRINTF_NAN_LEN_MAX 4
 139 #endif
 140
 141
 142 /* Standard streams.  */
 143 extern FILE *stdin;             /* Standard input stream.  */
 144 extern FILE *stdout;            /* Standard output stream.  */
 145 extern FILE *stderr;            /* Standard error output stream.  */
 146 /* C89/C99 say they're macros.  Make them happy.  */
 147 #define stdin stdin
 148 #define stdout stdout
 149 #define stderr stderr
 150
 151 /* Remove file FILENAME.  */
 152 extern int remove (const char *__filename) __THROW;
 153 /* Rename file OLD to NEW.  */
 154 extern int rename (const char *__old, const char *__new) __THROW;
 155
 156 #ifdef __USE_ATFILE
 157 /* Rename file OLD relative to OLDFD to NEW relative to NEWFD.  */
 158 extern int renameat (int __oldfd, const char *__old, int __newfd,
 159                      const char *__new) __THROW;
 160 #endif
 161
 162 #ifdef __USE_GNU
 163 /* Flags for renameat2.  */
 164 # define RENAME_NOREPLACE (1 << 0)
 165 # define RENAME_EXCHANGE (1 << 1)
 166 # define RENAME_WHITEOUT (1 << 2)
 167
 168 /* Rename file OLD relative to OLDFD to NEW relative to NEWFD, with
 169    additional flags.  */
 170 extern int renameat2 (int __oldfd, const char *__old, int __newfd,
 171                       const char *__new, unsigned int __flags) __THROW;
 172 #endif
 173
 174 /* Close STREAM.
 175
 176    This function is a possible cancellation point and therefore not
 177    marked with __THROW.  */
 178 extern int fclose (FILE *__stream);
 179
 180 #undef __attr_dealloc_fclose
 181 #define __attr_dealloc_fclose __attr_dealloc (fclose, 1)
 182
 183 /* Create a temporary file and open it read/write.
 184
 185    This function is a possible cancellation point and therefore not
 186    marked with __THROW.  */
 187 #ifndef __USE_FILE_OFFSET64
 188 extern FILE *tmpfile (void)
 189   __attribute_malloc__ __attr_dealloc_fclose __wur;
 190 #else
 191 # ifdef __REDIRECT
 192 extern FILE *__REDIRECT (tmpfile, (void), tmpfile64)
 193   __attribute_malloc__ __attr_dealloc_fclose __wur;
 194 # else
 195 #  define tmpfile tmpfile64
 196 # endif
 197 #endif
 198
 199 #ifdef __USE_LARGEFILE64
 200 extern FILE *tmpfile64 (void)
 201    __attribute_malloc__ __attr_dealloc_fclose __wur;
 202 #endif
 203
 204 /* Generate a temporary filename.  */
 205 extern char *tmpnam (char[L_tmpnam]) __THROW __wur;
 206
 207 #ifdef __USE_MISC
 208 /* This is the reentrant variant of `tmpnam'.  The only difference is
 209    that it does not allow S to be NULL.  */
 210 extern char *tmpnam_r (char __s[L_tmpnam]) __THROW __wur;
 211 #endif
 212
 213
 214 #if defined __USE_MISC || defined __USE_XOPEN
 215 /* Generate a unique temporary filename using up to five characters of PFX
 216    if it is not NULL.  The directory to put this file in is searched for
 217    as follows: First the environment variable "TMPDIR" is checked.
 218    If it contains the name of a writable directory, that directory is used.
 219    If not and if DIR is not NULL, that value is checked.  If that fails,
 220    P_tmpdir is tried and finally "/tmp".  The storage for the filename
 221    is allocated by `malloc'.  */
 222 extern char *tempnam (const char *__dir, const char *__pfx)
 223    __THROW __attribute_malloc__ __wur __attr_dealloc_free;
 224 #endif
 225
 226 /* Flush STREAM, or all streams if STREAM is NULL.
 227
 228    This function is a possible cancellation point and therefore not
 229    marked with __THROW.  */
 230 extern int fflush (FILE *__stream);
 231
 232 #ifdef __USE_MISC
 233 /* Faster versions when locking is not required.
 234
 235    This function is not part of POSIX and therefore no official
 236    cancellation point.  But due to similarity with an POSIX interface
 237    or due to the implementation it is a cancellation point and
 238    therefore not marked with __THROW.  */
 239 extern int fflush_unlocked (FILE *__stream);
 240 #endif
 241
 242 #ifdef __USE_GNU
 243 /* Close all streams.
 244
 245    This function is not part of POSIX and therefore no official
 246    cancellation point.  But due to similarity with an POSIX interface
 247    or due to the implementation it is a cancellation point and
 248    therefore not marked with __THROW.  */
 249 extern int fcloseall (void);
 250 #endif
 251
 252
 253 #ifndef __USE_FILE_OFFSET64
 254 /* Open a file and create a new stream for it.
 255
 256    This function is a possible cancellation point and therefore not
 257    marked with __THROW.  */
 258 extern FILE *fopen (const char *__restrict __filename,
 259                     const char *__restrict __modes)
 260   __attribute_malloc__ __attr_dealloc_fclose __wur;
 261 /* Open a file, replacing an existing stream with it.
 262
 263    This function is a possible cancellation point and therefore not
 264    marked with __THROW.  */
 265 extern FILE *freopen (const char *__restrict __filename,
 266                       const char *__restrict __modes,
 267                       FILE *__restrict __stream) __wur;
 268 #else
 269 # ifdef __REDIRECT
 270 extern FILE *__REDIRECT (fopen, (const char *__restrict __filename,
 271                                  const char *__restrict __modes), fopen64)
 272   __attribute_malloc__ __attr_dealloc_fclose __wur;
 273 extern FILE *__REDIRECT (freopen, (const char *__restrict __filename,
 274                                    const char *__restrict __modes,
 275                                    FILE *__restrict __stream), freopen64)
 276   __wur;
 277 # else
 278 #  define fopen fopen64
 279 #  define freopen freopen64
 280 # endif
 281 #endif
 282 #ifdef __USE_LARGEFILE64
 283 extern FILE *fopen64 (const char *__restrict __filename,
 284                       const char *__restrict __modes)
 285   __attribute_malloc__ __attr_dealloc_fclose __wur;
 286 extern FILE *freopen64 (const char *__restrict __filename,
 287                         const char *__restrict __modes,
 288                         FILE *__restrict __stream) __wur;
 289 #endif
 290
 291 #ifdef  __USE_POSIX
 292 /* Create a new stream that refers to an existing system file descriptor.  */
 293 extern FILE *fdopen (int __fd, const char *__modes) __THROW
 294   __attribute_malloc__ __attr_dealloc_fclose __wur;
 295 #endif
 296
 297 #ifdef  __USE_GNU
 298 /* Create a new stream that refers to the given magic cookie,
 299    and uses the given functions for input and output.  */
 300 extern FILE *fopencookie (void *__restrict __magic_cookie,
 301                           const char *__restrict __modes,
 302                           cookie_io_functions_t __io_funcs) __THROW
 303   __attribute_malloc__ __attr_dealloc_fclose __wur;
 304 #endif
 305
 306 #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2)
 307 /* Create a new stream that refers to a memory buffer.  */
 308 extern FILE *fmemopen (void *__s, size_t __len, const char *__modes)
 309   __THROW __attribute_malloc__ __attr_dealloc_fclose __wur;
 310
 311 /* Open a stream that writes into a malloc'd buffer that is expanded as
 312    necessary.  *BUFLOC and *SIZELOC are updated with the buffer's location
 313    and the number of characters written on fflush or fclose.  */
 314 extern FILE *open_memstream (char **__bufloc, size_t *__sizeloc) __THROW
 315   __attribute_malloc__ __attr_dealloc_fclose __wur;
 316
 317 #ifdef _WCHAR_H
 318 /* Like OPEN_MEMSTREAM, but the stream is wide oriented and produces
 319    a wide character string.  Declared here only to add attribute malloc
 320    and only if <wchar.h> has been previously #included.  */
 321 extern __FILE *open_wmemstream (wchar_t **__bufloc, size_t *__sizeloc) __THROW
 322   __attribute_malloc__ __attr_dealloc_fclose;
 323 # endif
 324 #endif
 325
 326 /* If BUF is NULL, make STREAM unbuffered.
 327    Else make it use buffer BUF, of size BUFSIZ.  */
 328 extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) __THROW;
 329 /* Make STREAM use buffering mode MODE.
 330    If BUF is not NULL, use N bytes of it for buffering;
 331    else allocate an internal buffer N bytes long.  */
 332 extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,
 333                     int __modes, size_t __n) __THROW;
 334
 335 #ifdef  __USE_MISC
 336 /* If BUF is NULL, make STREAM unbuffered.
 337    Else make it use SIZE bytes of BUF for buffering.  */
 338 extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,
 339                        size_t __size) __THROW;
 340
 341 /* Make STREAM line-buffered.  */
 342 extern void setlinebuf (FILE *__stream) __THROW;
 343 #endif
 344
 345
 346 /* Write formatted output to STREAM.
 347
 348    This function is a possible cancellation point and therefore not
 349    marked with __THROW.  */
 350 extern int fprintf (FILE *__restrict __stream,
 351                     const char *__restrict __format, ...);
 352 /* Write formatted output to stdout.
 353
 354    This function is a possible cancellation point and therefore not
 355    marked with __THROW.  */
 356 extern int printf (const char *__restrict __format, ...);
 357 /* Write formatted output to S.  */
 358 extern int sprintf (char *__restrict __s,
 359                     const char *__restrict __format, ...) __THROWNL;
 360
 361 /* Write formatted output to S from argument list ARG.
 362
 363    This function is a possible cancellation point and therefore not
 364    marked with __THROW.  */
 365 extern int vfprintf (FILE *__restrict __s, const char *__restrict __format,
 366                      __gnuc_va_list __arg);
 367 /* Write formatted output to stdout from argument list ARG.
 368
 369    This function is a possible cancellation point and therefore not
 370    marked with __THROW.  */
 371 extern int vprintf (const char *__restrict __format, __gnuc_va_list __arg);
 372 /* Write formatted output to S from argument list ARG.  */
 373 extern int vsprintf (char *__restrict __s, const char *__restrict __format,
 374                      __gnuc_va_list __arg) __THROWNL;
 375
 376 #if defined __USE_ISOC99 || defined __USE_UNIX98
 377 /* Maximum chars of output to write in MAXLEN.  */
 378 extern int snprintf (char *__restrict __s, size_t __maxlen,
 379                      const char *__restrict __format, ...)
 380      __THROWNL __attribute__ ((__format__ (__printf__, 3, 4)));
 381
 382 extern int vsnprintf (char *__restrict __s, size_t __maxlen,
 383                       const char *__restrict __format, __gnuc_va_list __arg)
 384      __THROWNL __attribute__ ((__format__ (__printf__, 3, 0)));
 385 #endif
 386
 387 #if __GLIBC_USE (LIB_EXT2)
 388 /* Write formatted output to a string dynamically allocated with `malloc'.
 389    Store the address of the string in *PTR.  */
 390 extern int vasprintf (char **__restrict __ptr, const char *__restrict __f,
 391                       __gnuc_va_list __arg)
 392      __THROWNL __attribute__ ((__format__ (__printf__, 2, 0))) __wur;
 393 extern int __asprintf (char **__restrict __ptr,
 394                        const char *__restrict __fmt, ...)
 395      __THROWNL __attribute__ ((__format__ (__printf__, 2, 3))) __wur;
 396 extern int asprintf (char **__restrict __ptr,
 397                      const char *__restrict __fmt, ...)
 398      __THROWNL __attribute__ ((__format__ (__printf__, 2, 3))) __wur;
 399 #endif
 400
 401 #ifdef __USE_XOPEN2K8
 402 /* Write formatted output to a file descriptor.  */
 403 extern int vdprintf (int __fd, const char *__restrict __fmt,
 404                      __gnuc_va_list __arg)
 405      __attribute__ ((__format__ (__printf__, 2, 0)));
 406 extern int dprintf (int __fd, const char *__restrict __fmt, ...)
 407      __attribute__ ((__format__ (__printf__, 2, 3)));
 408 #endif
 409
 410
 411 /* Read formatted input from STREAM.
 412
 413    This function is a possible cancellation point and therefore not
 414    marked with __THROW.  */
 415 extern int fscanf (FILE *__restrict __stream,
 416                    const char *__restrict __format, ...) __wur;
 417 /* Read formatted input from stdin.
 418
 419    This function is a possible cancellation point and therefore not
 420    marked with __THROW.  */
 421 extern int scanf (const char *__restrict __format, ...) __wur;
 422 /* Read formatted input from S.  */
 423 extern int sscanf (const char *__restrict __s,
 424                    const char *__restrict __format, ...) __THROW;
 425
 426 /* For historical reasons, the C99-compliant versions of the scanf
 427    functions are at alternative names.  When __LDBL_COMPAT or
 428    __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI are in effect, this is handled in
 429    bits/stdio-ldbl.h.  */
 430 #include <bits/floatn.h>
 431 #if !__GLIBC_USE (DEPRECATED_SCANF) && !defined __LDBL_COMPAT \
 432     && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0
 433 # ifdef __REDIRECT
 434 extern int __REDIRECT (fscanf, (FILE *__restrict __stream,
 435                                 const char *__restrict __format, ...),
 436                        __isoc99_fscanf) __wur;
 437 extern int __REDIRECT (scanf, (const char *__restrict __format, ...),
 438                        __isoc99_scanf) __wur;
 439 extern int __REDIRECT_NTH (sscanf, (const char *__restrict __s,
 440                                     const char *__restrict __format, ...),
 441                            __isoc99_sscanf);
 442 # else
 443 extern int __isoc99_fscanf (FILE *__restrict __stream,
 444                             const char *__restrict __format, ...) __wur;
 445 extern int __isoc99_scanf (const char *__restrict __format, ...) __wur;
 446 extern int __isoc99_sscanf (const char *__restrict __s,
 447                             const char *__restrict __format, ...) __THROW;
 448 #  define fscanf __isoc99_fscanf
 449 #  define scanf __isoc99_scanf
 450 #  define sscanf __isoc99_sscanf
 451 # endif
 452 #endif
 453
 454 #ifdef  __USE_ISOC99
 455 /* Read formatted input from S into argument list ARG.
 456
 457    This function is a possible cancellation point and therefore not
 458    marked with __THROW.  */
 459 extern int vfscanf (FILE *__restrict __s, const char *__restrict __format,
 460                     __gnuc_va_list __arg)
 461      __attribute__ ((__format__ (__scanf__, 2, 0))) __wur;
 462
 463 /* Read formatted input from stdin into argument list ARG.
 464
 465    This function is a possible cancellation point and therefore not
 466    marked with __THROW.  */
 467 extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg)
 468      __attribute__ ((__format__ (__scanf__, 1, 0))) __wur;
 469
 470 /* Read formatted input from S into argument list ARG.  */
 471 extern int vsscanf (const char *__restrict __s,
 472                     const char *__restrict __format, __gnuc_va_list __arg)
 473      __THROW __attribute__ ((__format__ (__scanf__, 2, 0)));
 474
 475 /* Same redirection as above for the v*scanf family.  */
 476 # if !__GLIBC_USE (DEPRECATED_SCANF)
 477 #  if defined __REDIRECT && !defined __LDBL_COMPAT \
 478       && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0
 479 extern int __REDIRECT (vfscanf,
 480                        (FILE *__restrict __s,
 481                         const char *__restrict __format, __gnuc_va_list __arg),
 482                        __isoc99_vfscanf)
 483      __attribute__ ((__format__ (__scanf__, 2, 0))) __wur;
 484 extern int __REDIRECT (vscanf, (const char *__restrict __format,
 485                                 __gnuc_va_list __arg), __isoc99_vscanf)
 486      __attribute__ ((__format__ (__scanf__, 1, 0))) __wur;
 487 extern int __REDIRECT_NTH (vsscanf,
 488                            (const char *__restrict __s,
 489                             const char *__restrict __format,
 490                             __gnuc_va_list __arg), __isoc99_vsscanf)
 491      __attribute__ ((__format__ (__scanf__, 2, 0)));
 492 #  elif !defined __REDIRECT
 493 extern int __isoc99_vfscanf (FILE *__restrict __s,
 494                              const char *__restrict __format,
 495                              __gnuc_va_list __arg) __wur;
 496 extern int __isoc99_vscanf (const char *__restrict __format,
 497                             __gnuc_va_list __arg) __wur;
 498 extern int __isoc99_vsscanf (const char *__restrict __s,
 499                              const char *__restrict __format,
 500                              __gnuc_va_list __arg) __THROW;
 501 #   define vfscanf __isoc99_vfscanf
 502 #   define vscanf __isoc99_vscanf
 503 #   define vsscanf __isoc99_vsscanf
 504 #  endif
 505 # endif
 506 #endif /* Use ISO C9x.  */
 507
 508
 509 /* Read a character from STREAM.
 510
 511    These functions are possible cancellation points and therefore not
 512    marked with __THROW.  */
 513 extern int fgetc (FILE *__stream);
 514 extern int getc (FILE *__stream);
 515
 516 /* Read a character from stdin.
 517
 518    This function is a possible cancellation point and therefore not
 519    marked with __THROW.  */
 520 extern int getchar (void);
 521
 522 #ifdef __USE_POSIX199506
 523 /* These are defined in POSIX.1:1996.
 524
 525    These functions are possible cancellation points and therefore not
 526    marked with __THROW.  */
 527 extern int getc_unlocked (FILE *__stream);
 528 extern int getchar_unlocked (void);
 529 #endif /* Use POSIX.  */
 530
 531 #ifdef __USE_MISC
 532 /* Faster version when locking is not necessary.
 533
 534    This function is not part of POSIX and therefore no official
 535    cancellation point.  But due to similarity with an POSIX interface
 536    or due to the implementation it is a cancellation point and
 537    therefore not marked with __THROW.  */
 538 extern int fgetc_unlocked (FILE *__stream);
 539 #endif /* Use MISC.  */
 540
 541
 542 /* Write a character to STREAM.
 543
 544    These functions are possible cancellation points and therefore not
 545    marked with __THROW.
 546
 547    These functions is a possible cancellation point and therefore not
 548    marked with __THROW.  */
 549 extern int fputc (int __c, FILE *__stream);
 550 extern int putc (int __c, FILE *__stream);
 551
 552 /* Write a character to stdout.
 553
 554    This function is a possible cancellation point and therefore not
 555    marked with __THROW.  */
 556 extern int putchar (int __c);
 557
 558 #ifdef __USE_MISC
 559 /* Faster version when locking is not necessary.
 560
 561    This function is not part of POSIX and therefore no official
 562    cancellation point.  But due to similarity with an POSIX interface
 563    or due to the implementation it is a cancellation point and
 564    therefore not marked with __THROW.  */
 565 extern int fputc_unlocked (int __c, FILE *__stream);
 566 #endif /* Use MISC.  */
 567
 568 #ifdef __USE_POSIX199506
 569 /* These are defined in POSIX.1:1996.
 570
 571    These functions are possible cancellation points and therefore not
 572    marked with __THROW.  */
 573 extern int putc_unlocked (int __c, FILE *__stream);
 574 extern int putchar_unlocked (int __c);
 575 #endif /* Use POSIX.  */
 576
 577
 578 #if defined __USE_MISC \
 579     || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
 580 /* Get a word (int) from STREAM.  */
 581 extern int getw (FILE *__stream);
 582
 583 /* Write a word (int) to STREAM.  */
 584 extern int putw (int __w, FILE *__stream);
 585 #endif
 586
 587
 588 /* Get a newline-terminated string of finite length from STREAM.
 589
 590    This function is a possible cancellation point and therefore not
 591    marked with __THROW.  */
 592 extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
 593      __wur __fortified_attr_access (__write_only__, 1, 2);
 594
 595 #if __GLIBC_USE (DEPRECATED_GETS)
 596 /* Get a newline-terminated string from stdin, removing the newline.
 597
 598    This function is impossible to use safely.  It has been officially
 599    removed from ISO C11 and ISO C++14, and we have also removed it
 600    from the _GNU_SOURCE feature list.  It remains available when
 601    explicitly using an old ISO C, Unix, or POSIX standard.
 602
 603    This function is a possible cancellation point and therefore not
 604    marked with __THROW.  */
 605 extern char *gets (char *__s) __wur __attribute_deprecated__;
 606 #endif
 607
 608 #ifdef __USE_GNU
 609 /* This function does the same as `fgets' but does not lock the stream.
 610
 611    This function is not part of POSIX and therefore no official
 612    cancellation point.  But due to similarity with an POSIX interface
 613    or due to the implementation it is a cancellation point and
 614    therefore not marked with __THROW.  */
 615 extern char *fgets_unlocked (char *__restrict __s, int __n,
 616                              FILE *__restrict __stream) __wur
 617     __fortified_attr_access (__write_only__, 1, 2);
 618 #endif
 619
 620
 621 #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2)
 622 /* Read up to (and including) a DELIMITER from STREAM into *LINEPTR
 623    (and null-terminate it). *LINEPTR is a pointer returned from malloc (or
 624    NULL), pointing to *N characters of space.  It is realloc'd as
 625    necessary.  Returns the number of characters read (not including the
 626    null terminator), or -1 on error or EOF.
 627
 628    These functions are not part of POSIX and therefore no official
 629    cancellation point.  But due to similarity with an POSIX interface
 630    or due to the implementation they are cancellation points and
 631    therefore not marked with __THROW.  */
 632 extern __ssize_t __getdelim (char **__restrict __lineptr,
 633                              size_t *__restrict __n, int __delimiter,
 634                              FILE *__restrict __stream) __wur;
 635 extern __ssize_t getdelim (char **__restrict __lineptr,
 636                            size_t *__restrict __n, int __delimiter,
 637                            FILE *__restrict __stream) __wur;
 638
 639 /* Like `getdelim', but reads up to a newline.
 640
 641    This function is not part of POSIX and therefore no official
 642    cancellation point.  But due to similarity with an POSIX interface
 643    or due to the implementation it is a cancellation point and
 644    therefore not marked with __THROW.  */
 645 extern __ssize_t getline (char **__restrict __lineptr,
 646                           size_t *__restrict __n,
 647                           FILE *__restrict __stream) __wur;
 648 #endif
 649
 650
 651 /* Write a string to STREAM.
 652
 653    This function is a possible cancellation point and therefore not
 654    marked with __THROW.  */
 655 extern int fputs (const char *__restrict __s, FILE *__restrict __stream);
 656
 657 /* Write a string, followed by a newline, to stdout.
 658
 659    This function is a possible cancellation point and therefore not
 660    marked with __THROW.  */
 661 extern int puts (const char *__s);
 662
 663
 664 /* Push a character back onto the input buffer of STREAM.
 665
 666    This function is a possible cancellation point and therefore not
 667    marked with __THROW.  */
 668 extern int ungetc (int __c, FILE *__stream);
 669
 670
 671 /* Read chunks of generic data from STREAM.
 672
 673    This function is a possible cancellation point and therefore not
 674    marked with __THROW.  */
 675 extern size_t fread (void *__restrict __ptr, size_t __size,
 676                      size_t __n, FILE *__restrict __stream) __wur;
 677 /* Write chunks of generic data to STREAM.
 678
 679    This function is a possible cancellation point and therefore not
 680    marked with __THROW.  */
 681 extern size_t fwrite (const void *__restrict __ptr, size_t __size,
 682                       size_t __n, FILE *__restrict __s);
 683
 684 #ifdef __USE_GNU
 685 /* This function does the same as `fputs' but does not lock the stream.
 686
 687    This function is not part of POSIX and therefore no official
 688    cancellation point.  But due to similarity with an POSIX interface
 689    or due to the implementation it is a cancellation point and
 690    therefore not marked with __THROW.  */
 691 extern int fputs_unlocked (const char *__restrict __s,
 692                            FILE *__restrict __stream);
 693 #endif
 694
 695 #ifdef __USE_MISC
 696 /* Faster versions when locking is not necessary.
 697
 698    These functions are not part of POSIX and therefore no official
 699    cancellation point.  But due to similarity with an POSIX interface
 700    or due to the implementation they are cancellation points and
 701    therefore not marked with __THROW.  */
 702 extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,
 703                               size_t __n, FILE *__restrict __stream) __wur;
 704 extern size_t fwrite_unlocked (const void *__restrict __ptr, size_t __size,
 705                                size_t __n, FILE *__restrict __stream);
 706 #endif
 707
 708
 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 fseek (FILE *__stream, long int __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 long int ftell (FILE *__stream) __wur;
 719 /* Rewind to the beginning of STREAM.
 720
 721    This function is a possible cancellation point and therefore not
 722    marked with __THROW.  */
 723 extern void rewind (FILE *__stream);
 724
 725 /* The Single Unix Specification, Version 2, specifies an alternative,
 726    more adequate interface for the two functions above which deal with
 727    file offset.  `long int' is not the right type.  These definitions
 728    are originally defined in the Large File Support API.  */
 729
 730 #if defined __USE_LARGEFILE || defined __USE_XOPEN2K
 731 # ifndef __USE_FILE_OFFSET64
 732 /* Seek to a certain position on STREAM.
 733
 734    This function is a possible cancellation point and therefore not
 735    marked with __THROW.  */
 736 extern int fseeko (FILE *__stream, __off_t __off, int __whence);
 737 /* Return the current position of STREAM.
 738
 739    This function is a possible cancellation point and therefore not
 740    marked with __THROW.  */
 741 extern __off_t ftello (FILE *__stream) __wur;
 742 # else
 743 #  ifdef __REDIRECT
 744 extern int __REDIRECT (fseeko,
 745                        (FILE *__stream, __off64_t __off, int __whence),
 746                        fseeko64);
 747 extern __off64_t __REDIRECT (ftello, (FILE *__stream), ftello64);
 748 #  else
 749 #   define fseeko fseeko64
 750 #   define ftello ftello64
 751 #  endif
 752 # endif
 753 #endif
 754
 755 #ifndef __USE_FILE_OFFSET64
 756 /* Get STREAM's position.
 757
 758    This function is a possible cancellation point and therefore not
 759    marked with __THROW.  */
 760 extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos);
 761 /* Set STREAM's position.
 762
 763    This function is a possible cancellation point and therefore not
 764    marked with __THROW.  */
 765 extern int fsetpos (FILE *__stream, const fpos_t *__pos);
 766 #else
 767 # ifdef __REDIRECT
 768 extern int __REDIRECT (fgetpos, (FILE *__restrict __stream,
 769                                  fpos_t *__restrict __pos), fgetpos64);
 770 extern int __REDIRECT (fsetpos,
 771                        (FILE *__stream, const fpos_t *__pos), fsetpos64);
 772 # else
 773 #  define fgetpos fgetpos64
 774 #  define fsetpos fsetpos64
 775 # endif
 776 #endif
 777
 778 #ifdef __USE_LARGEFILE64
 779 extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence);
 780 extern __off64_t ftello64 (FILE *__stream) __wur;
 781 extern int fgetpos64 (FILE *__restrict __stream, fpos64_t *__restrict __pos);
 782 extern int fsetpos64 (FILE *__stream, const fpos64_t *__pos);
 783 #endif
 784
 785 /* Clear the error and EOF indicators for STREAM.  */
 786 extern void clearerr (FILE *__stream) __THROW;
 787 /* Return the EOF indicator for STREAM.  */
 788 extern int feof (FILE *__stream) __THROW __wur;
 789 /* Return the error indicator for STREAM.  */
 790 extern int ferror (FILE *__stream) __THROW __wur;
 791
 792 #ifdef __USE_MISC
 793 /* Faster versions when locking is not required.  */
 794 extern void clearerr_unlocked (FILE *__stream) __THROW;
 795 extern int feof_unlocked (FILE *__stream) __THROW __wur;
 796 extern int ferror_unlocked (FILE *__stream) __THROW __wur;
 797 #endif
 798
 799
 800 /* Print a message describing the meaning of the value of errno.
 801
 802    This function is a possible cancellation point and therefore not
 803    marked with __THROW.  */
 804 extern void perror (const char *__s);
 805
 806
 807 #ifdef  __USE_POSIX
 808 /* Return the system file descriptor for STREAM.  */
 809 extern int fileno (FILE *__stream) __THROW __wur;
 810 #endif /* Use POSIX.  */
 811
 812 #ifdef __USE_MISC
 813 /* Faster version when locking is not required.  */
 814 extern int fileno_unlocked (FILE *__stream) __THROW __wur;
 815 #endif
 816
 817
 818 #ifdef __USE_POSIX2
 819 /* Close a stream opened by popen and return the status of its child.
 820
 821    This function is a possible cancellation point and therefore not
 822    marked with __THROW.  */
 823 extern int pclose (FILE *__stream);
 824
 825 /* Create a new stream connected to a pipe running the given command.
 826
 827    This function is a possible cancellation point and therefore not
 828    marked with __THROW.  */
 829 extern FILE *popen (const char *__command, const char *__modes)
 830   __attribute_malloc__ __attr_dealloc (pclose, 1) __wur;
 831
 832 #endif
 833
 834
 835 #ifdef  __USE_POSIX
 836 /* Return the name of the controlling terminal.  */
 837 extern char *ctermid (char *__s) __THROW
 838   __attr_access ((__write_only__, 1));
 839 #endif /* Use POSIX.  */
 840
 841
 842 #if (defined __USE_XOPEN && !defined __USE_XOPEN2K) || defined __USE_GNU
 843 /* Return the name of the current user.  */
 844 extern char *cuserid (char *__s)
 845   __attr_access ((__write_only__, 1));
 846 #endif /* Use X/Open, but not issue 6.  */
 847
 848
 849 #ifdef  __USE_GNU
 850 struct obstack;                 /* See <obstack.h>.  */
 851
 852 /* Write formatted output to an obstack.  */
 853 extern int obstack_printf (struct obstack *__restrict __obstack,
 854                            const char *__restrict __format, ...)
 855      __THROWNL __attribute__ ((__format__ (__printf__, 2, 3)));
 856 extern int obstack_vprintf (struct obstack *__restrict __obstack,
 857                             const char *__restrict __format,
 858                             __gnuc_va_list __args)
 859      __THROWNL __attribute__ ((__format__ (__printf__, 2, 0)));
 860 #endif /* Use GNU.  */
 861
 862
 863 #ifdef __USE_POSIX199506
 864 /* These are defined in POSIX.1:1996.  */
 865
 866 /* Acquire ownership of STREAM.  */
 867 extern void flockfile (FILE *__stream) __THROW;
 868
 869 /* Try to acquire ownership of STREAM but do not block if it is not
 870    possible.  */
 871 extern int ftrylockfile (FILE *__stream) __THROW __wur;
 872
 873 /* Relinquish the ownership granted for STREAM.  */
 874 extern void funlockfile (FILE *__stream) __THROW;
 875 #endif /* POSIX */
 876
 877 #if defined __USE_XOPEN && !defined __USE_XOPEN2K && !defined __USE_GNU
 878 /*  X/Open Issues 1-5 required getopt to be declared in this
 879    header.  It was removed in Issue 6.  GNU follows Issue 6.  */
 880 # include <bits/getopt_posix.h>
 881 #endif
 882
 883 /* Slow-path routines used by the optimized inline functions in
 884    bits/stdio.h.  */
 885 extern int __uflow (FILE *);
 886 extern int __overflow (FILE *, int);
 887
 888 /* If we are compiling with optimizing read this file.  It contains
 889    several optimizing inline functions and macros.  */
 890 #ifdef __USE_EXTERN_INLINES
 891 # include <bits/stdio.h>
 892 #endif
 893 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 894 # include <bits/stdio2.h>
 895 #endif
 896
 897 #include <bits/floatn.h>
 898 #if defined __LDBL_COMPAT || __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
 899 # include <bits/stdio-ldbl.h>
 900 #endif
 901
 902 __END_DECLS
 903
 904 #endif /* <stdio.h> included.  */