libio/libio.h

   1 /* Copyright (C) 1991-1995,1997-2007,2009,2011,2012
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Per Bothner <bothner@cygnus.com>.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.
  19
  20    As a special exception, if you link the code in this file with
  21    files compiled with a GNU compiler to produce an executable,
  22    that does not cause the resulting executable to be covered by
  23    the GNU Lesser General Public License.  This exception does not
  24    however invalidate any other reasons why the executable file
  25    might be covered by the GNU Lesser General Public License.
  26    This exception applies to code released by its copyright holders
  27    in files containing the exception.  */
  28
  29 #ifndef _IO_STDIO_H
  30 #define _IO_STDIO_H
  31
  32 #include <_G_config.h>
  33 /* ALL of these should be defined in _G_config.h */
  34 #define _IO_fpos_t _G_fpos_t
  35 #define _IO_fpos64_t _G_fpos64_t
  36 #define _IO_size_t size_t
  37 #define _IO_ssize_t __ssize_t
  38 #define _IO_off_t __off_t
  39 #define _IO_off64_t __off64_t
  40 #define _IO_pid_t __pid_t
  41 #define _IO_uid_t __uid_t
  42 #define _IO_iconv_t _G_iconv_t
  43 #define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE
  44 #define _IO_BUFSIZ _G_BUFSIZ
  45 #define _IO_va_list _G_va_list
  46 #define _IO_wint_t wint_t
  47
  48 /* This define avoids name pollution if we're using GNU stdarg.h */
  49 #define __need___va_list
  50 #include <stdarg.h>
  51 #ifdef __GNUC_VA_LIST
  52 # undef _IO_va_list
  53 # define _IO_va_list __gnuc_va_list
  54 #endif /* __GNUC_VA_LIST */
  55
  56 #ifndef __P
  57 # include <sys/cdefs.h>
  58 #endif /*!__P*/
  59
  60 #define _IO_UNIFIED_JUMPTABLES 1
  61
  62 #ifndef EOF
  63 # define EOF (-1)
  64 #endif
  65 #ifndef NULL
  66 # if defined __GNUG__ && \
  67     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
  68 #  define NULL (__null)
  69 # else
  70 #  if !defined(__cplusplus)
  71 #   define NULL ((void*)0)
  72 #  else
  73 #   define NULL (0)
  74 #  endif
  75 # endif
  76 #endif
  77
  78 #define _IOS_INPUT      1
  79 #define _IOS_OUTPUT     2
  80 #define _IOS_ATEND      4
  81 #define _IOS_APPEND     8
  82 #define _IOS_TRUNC      16
  83 #define _IOS_NOCREATE   32
  84 #define _IOS_NOREPLACE  64
  85 #define _IOS_BIN        128
  86
  87 /* Magic numbers and bits for the _flags field.
  88    The magic numbers use the high-order bits of _flags;
  89    the remaining bits are available for variable flags.
  90    Note: The magic numbers must all be negative if stdio
  91    emulation is desired. */
  92
  93 #define _IO_MAGIC 0xFBAD0000 /* Magic number */
  94 #define _OLD_STDIO_MAGIC 0xFABC0000 /* Emulate old stdio. */
  95 #define _IO_MAGIC_MASK 0xFFFF0000
  96 #define _IO_USER_BUF 1 /* User owns buffer; don't delete it on close. */
  97 #define _IO_UNBUFFERED 2
  98 #define _IO_NO_READS 4 /* Reading not allowed */
  99 #define _IO_NO_WRITES 8 /* Writing not allowd */
 100 #define _IO_EOF_SEEN 0x10
 101 #define _IO_ERR_SEEN 0x20
 102 #define _IO_DELETE_DONT_CLOSE 0x40 /* Don't call close(_fileno) on cleanup. */
 103 #define _IO_LINKED 0x80 /* Set if linked (using _chain) to streambuf::_list_all.*/
 104 #define _IO_IN_BACKUP 0x100
 105 #define _IO_LINE_BUF 0x200
 106 #define _IO_TIED_PUT_GET 0x400 /* Set if put and get pointer logicly tied. */
 107 #define _IO_CURRENTLY_PUTTING 0x800
 108 #define _IO_IS_APPENDING 0x1000
 109 #define _IO_IS_FILEBUF 0x2000
 110 #define _IO_BAD_SEEN 0x4000
 111 #define _IO_USER_LOCK 0x8000
 112
 113 #define _IO_FLAGS2_MMAP 1
 114 #define _IO_FLAGS2_NOTCANCEL 2
 115 #ifdef _LIBC
 116 # define _IO_FLAGS2_FORTIFY 4
 117 #endif
 118 #define _IO_FLAGS2_USER_WBUF 8
 119 #ifdef _LIBC
 120 # define _IO_FLAGS2_SCANF_STD 16
 121 # define _IO_FLAGS2_NOCLOSE 32
 122 # define _IO_FLAGS2_CLOEXEC 64
 123 #endif
 124
 125 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 126 #define _IO_SKIPWS 01
 127 #define _IO_LEFT 02
 128 #define _IO_RIGHT 04
 129 #define _IO_INTERNAL 010
 130 #define _IO_DEC 020
 131 #define _IO_OCT 040
 132 #define _IO_HEX 0100
 133 #define _IO_SHOWBASE 0200
 134 #define _IO_SHOWPOINT 0400
 135 #define _IO_UPPERCASE 01000
 136 #define _IO_SHOWPOS 02000
 137 #define _IO_SCIENTIFIC 04000
 138 #define _IO_FIXED 010000
 139 #define _IO_UNITBUF 020000
 140 #define _IO_STDIO 040000
 141 #define _IO_DONT_CLOSE 0100000
 142 #define _IO_BOOLALPHA 0200000
 143
 144
 145 struct _IO_jump_t;  struct _IO_FILE;
 146
 147 /* Handle lock.  */
 148 #ifdef _IO_MTSAFE_IO
 149 # if defined __GLIBC__ && __GLIBC__ >= 2
 150 #  include <bits/stdio-lock.h>
 151 # else
 152 /*# include <comthread.h>*/
 153 # endif
 154 #else
 155 typedef void _IO_lock_t;
 156 #endif
 157
 158
 159 /* A streammarker remembers a position in a buffer. */
 160
 161 struct _IO_marker {
 162   struct _IO_marker *_next;
 163   struct _IO_FILE *_sbuf;
 164   /* If _pos >= 0
 165  it points to _buf->Gbase()+_pos. FIXME comment */
 166   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 167   int _pos;
 168 #if 0
 169     void set_streampos(streampos sp) { _spos = sp; }
 170     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 171   public:
 172     streammarker(streambuf *sb);
 173     ~streammarker();
 174     int saving() { return  _spos == -2; }
 175     int delta(streammarker&);
 176     int delta();
 177 #endif
 178 };
 179
 180 /* This is the structure from the libstdc++ codecvt class.  */
 181 enum __codecvt_result
 182 {
 183   __codecvt_ok,
 184   __codecvt_partial,
 185   __codecvt_error,
 186   __codecvt_noconv
 187 };
 188
 189 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 190 /* The order of the elements in the following struct must match the order
 191    of the virtual functions in the libstdc++ codecvt class.  */
 192 struct _IO_codecvt
 193 {
 194   void (*__codecvt_destr) (struct _IO_codecvt *);
 195   enum __codecvt_result (*__codecvt_do_out) (struct _IO_codecvt *,
 196                                              __mbstate_t *,
 197                                              const wchar_t *,
 198                                              const wchar_t *,
 199                                              const wchar_t **, char *,
 200                                              char *, char **);
 201   enum __codecvt_result (*__codecvt_do_unshift) (struct _IO_codecvt *,
 202                                                  __mbstate_t *, char *,
 203                                                  char *, char **);
 204   enum __codecvt_result (*__codecvt_do_in) (struct _IO_codecvt *,
 205                                             __mbstate_t *,
 206                                             const char *, const char *,
 207                                             const char **, wchar_t *,
 208                                             wchar_t *, wchar_t **);
 209   int (*__codecvt_do_encoding) (struct _IO_codecvt *);
 210   int (*__codecvt_do_always_noconv) (struct _IO_codecvt *);
 211   int (*__codecvt_do_length) (struct _IO_codecvt *, __mbstate_t *,
 212                               const char *, const char *, _IO_size_t);
 213   int (*__codecvt_do_max_length) (struct _IO_codecvt *);
 214
 215   _IO_iconv_t __cd_in;
 216   _IO_iconv_t __cd_out;
 217 };
 218
 219 /* Extra data for wide character streams.  */
 220 struct _IO_wide_data
 221 {
 222   wchar_t *_IO_read_ptr;        /* Current read pointer */
 223   wchar_t *_IO_read_end;        /* End of get area. */
 224   wchar_t *_IO_read_base;       /* Start of putback+get area. */
 225   wchar_t *_IO_write_base;      /* Start of put area. */
 226   wchar_t *_IO_write_ptr;       /* Current put pointer. */
 227   wchar_t *_IO_write_end;       /* End of put area. */
 228   wchar_t *_IO_buf_base;        /* Start of reserve area. */
 229   wchar_t *_IO_buf_end;         /* End of reserve area. */
 230   /* The following fields are used to support backing up and undo. */
 231   wchar_t *_IO_save_base;       /* Pointer to start of non-current get area. */
 232   wchar_t *_IO_backup_base;     /* Pointer to first valid character of
 233                                    backup area */
 234   wchar_t *_IO_save_end;        /* Pointer to end of non-current get area. */
 235
 236   __mbstate_t _IO_state;
 237   __mbstate_t _IO_last_state;
 238   struct _IO_codecvt _codecvt;
 239
 240   wchar_t _shortbuf[1];
 241
 242   const struct _IO_jump_t *_wide_vtable;
 243 };
 244 #endif
 245
 246 struct _IO_FILE {
 247   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 248 #define _IO_file_flags _flags
 249
 250   /* The following pointers correspond to the C++ streambuf protocol. */
 251   /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
 252   char* _IO_read_ptr;   /* Current read pointer */
 253   char* _IO_read_end;   /* End of get area. */
 254   char* _IO_read_base;  /* Start of putback+get area. */
 255   char* _IO_write_base; /* Start of put area. */
 256   char* _IO_write_ptr;  /* Current put pointer. */
 257   char* _IO_write_end;  /* End of put area. */
 258   char* _IO_buf_base;   /* Start of reserve area. */
 259   char* _IO_buf_end;    /* End of reserve area. */
 260   /* The following fields are used to support backing up and undo. */
 261   char *_IO_save_base; /* Pointer to start of non-current get area. */
 262   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 263   char *_IO_save_end; /* Pointer to end of non-current get area. */
 264
 265   struct _IO_marker *_markers;
 266
 267   struct _IO_FILE *_chain;
 268
 269   int _fileno;
 270 #if 0
 271   int _blksize;
 272 #else
 273   int _flags2;
 274 #endif
 275   _IO_off_t _old_offset; /* This used to be _offset but it's too small.  */
 276
 277 #define __HAVE_COLUMN /* temporary */
 278   /* 1+column number of pbase(); 0 is unknown. */
 279   unsigned short _cur_column;
 280   signed char _vtable_offset;
 281   char _shortbuf[1];
 282
 283   /*  char* _save_gptr;  char* _save_egptr; */
 284
 285   _IO_lock_t *_lock;
 286 #ifdef _IO_USE_OLD_IO_FILE
 287 };
 288
 289 struct _IO_FILE_complete
 290 {
 291   struct _IO_FILE _file;
 292 #endif
 293 #if defined _G_IO_IO_FILE_VERSION && _G_IO_IO_FILE_VERSION == 0x20001
 294   _IO_off64_t _offset;
 295 # if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 296   /* Wide character stream stuff.  */
 297   struct _IO_codecvt *_codecvt;
 298   struct _IO_wide_data *_wide_data;
 299   struct _IO_FILE *_freeres_list;
 300   void *_freeres_buf;
 301   size_t _freeres_size;
 302 # else
 303   void *__pad1;
 304   void *__pad2;
 305   void *__pad3;
 306   void *__pad4;
 307   size_t __pad5;
 308 # endif
 309   int _mode;
 310   /* Make sure we don't get into trouble again.  */
 311   char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
 312 #endif
 313 };
 314
 315 #ifndef __cplusplus
 316 typedef struct _IO_FILE _IO_FILE;
 317 #endif
 318
 319 struct _IO_FILE_plus;
 320
 321 extern struct _IO_FILE_plus _IO_2_1_stdin_;
 322 extern struct _IO_FILE_plus _IO_2_1_stdout_;
 323 extern struct _IO_FILE_plus _IO_2_1_stderr_;
 324 #ifndef _LIBC
 325 #define _IO_stdin ((_IO_FILE*)(&_IO_2_1_stdin_))
 326 #define _IO_stdout ((_IO_FILE*)(&_IO_2_1_stdout_))
 327 #define _IO_stderr ((_IO_FILE*)(&_IO_2_1_stderr_))
 328 #else
 329 extern _IO_FILE *_IO_stdin attribute_hidden;
 330 extern _IO_FILE *_IO_stdout attribute_hidden;
 331 extern _IO_FILE *_IO_stderr attribute_hidden;
 332 #endif
 333
 334
 335 /* Functions to do I/O and file management for a stream.  */
 336
 337 /* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
 338    Return number of bytes read.  */
 339 typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);
 340
 341 /* Write N bytes pointed to by BUF to COOKIE.  Write all N bytes
 342    unless there is an error.  Return number of bytes written.  If
 343    there is an error, return 0 and do not write anything.  If the file
 344    has been opened for append (__mode.__append set), then set the file
 345    pointer to the end of the file and then do the write; if not, just
 346    write at the current file pointer.  */
 347 typedef __ssize_t __io_write_fn (void *__cookie, const char *__buf,
 348                                  size_t __n);
 349
 350 /* Move COOKIE's file position to *POS bytes from the
 351    beginning of the file (if W is SEEK_SET),
 352    the current position (if W is SEEK_CUR),
 353    or the end of the file (if W is SEEK_END).
 354    Set *POS to the new file position.
 355    Returns zero if successful, nonzero if not.  */
 356 typedef int __io_seek_fn (void *__cookie, _IO_off64_t *__pos, int __w);
 357
 358 /* Close COOKIE.  */
 359 typedef int __io_close_fn (void *__cookie);
 360
 361
 362 #ifdef _GNU_SOURCE
 363 /* User-visible names for the above.  */
 364 typedef __io_read_fn cookie_read_function_t;
 365 typedef __io_write_fn cookie_write_function_t;
 366 typedef __io_seek_fn cookie_seek_function_t;
 367 typedef __io_close_fn cookie_close_function_t;
 368
 369 /* The structure with the cookie function pointers.  */
 370 typedef struct
 371 {
 372   __io_read_fn *read;           /* Read bytes.  */
 373   __io_write_fn *write;         /* Write bytes.  */
 374   __io_seek_fn *seek;           /* Seek/tell file position.  */
 375   __io_close_fn *close;         /* Close file.  */
 376 } _IO_cookie_io_functions_t;
 377 typedef _IO_cookie_io_functions_t cookie_io_functions_t;
 378
 379 struct _IO_cookie_file;
 380
 381 /* Initialize one of those.  */
 382 extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
 383                              void *__cookie, _IO_cookie_io_functions_t __fns);
 384 #endif
 385
 386
 387 #ifdef __cplusplus
 388 extern "C" {
 389 #endif
 390
 391 extern int __underflow (_IO_FILE *);
 392 extern int __uflow (_IO_FILE *);
 393 extern int __overflow (_IO_FILE *, int);
 394 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 395 extern _IO_wint_t __wunderflow (_IO_FILE *);
 396 extern _IO_wint_t __wuflow (_IO_FILE *);
 397 extern _IO_wint_t __woverflow (_IO_FILE *, _IO_wint_t);
 398 #endif
 399
 400 #if  __GNUC__ >= 3
 401 # define _IO_BE(expr, res) __builtin_expect ((expr), res)
 402 #else
 403 # define _IO_BE(expr, res) (expr)
 404 #endif
 405
 406 #define _IO_getc_unlocked(_fp) \
 407        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 408         ? __uflow (_fp) : *(unsigned char *) (_fp)->_IO_read_ptr++)
 409 #define _IO_peekc_unlocked(_fp) \
 410        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 411           && __underflow (_fp) == EOF ? EOF \
 412         : *(unsigned char *) (_fp)->_IO_read_ptr)
 413 #define _IO_putc_unlocked(_ch, _fp) \
 414    (_IO_BE ((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end, 0) \
 415     ? __overflow (_fp, (unsigned char) (_ch)) \
 416     : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))
 417
 418 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 419 # define _IO_getwc_unlocked(_fp) \
 420   (_IO_BE ((_fp)->_wide_data == NULL                                    \
 421            || ((_fp)->_wide_data->_IO_read_ptr                          \
 422                >= (_fp)->_wide_data->_IO_read_end), 0)                  \
 423    ? __wuflow (_fp) : (_IO_wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
 424 # define _IO_putwc_unlocked(_wch, _fp) \
 425   (_IO_BE ((_fp)->_wide_data == NULL                                    \
 426            || ((_fp)->_wide_data->_IO_write_ptr                         \
 427                >= (_fp)->_wide_data->_IO_write_end), 0)                 \
 428    ? __woverflow (_fp, _wch)                                            \
 429    : (_IO_wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))
 430 #endif
 431
 432 #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 433 #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 434
 435 extern int _IO_getc (_IO_FILE *__fp);
 436 extern int _IO_putc (int __c, _IO_FILE *__fp);
 437 extern int _IO_feof (_IO_FILE *__fp) __THROW;
 438 extern int _IO_ferror (_IO_FILE *__fp) __THROW;
 439
 440 extern int _IO_peekc_locked (_IO_FILE *__fp);
 441
 442 /* This one is for Emacs. */
 443 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 444         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 445
 446 extern void _IO_flockfile (_IO_FILE *) __THROW;
 447 extern void _IO_funlockfile (_IO_FILE *) __THROW;
 448 extern int _IO_ftrylockfile (_IO_FILE *) __THROW;
 449
 450 #ifdef _IO_MTSAFE_IO
 451 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
 452 # define _IO_flockfile(_fp) \
 453   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_flockfile (_fp)
 454 # define _IO_funlockfile(_fp) \
 455   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_funlockfile (_fp)
 456 #else
 457 # define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 458 # define _IO_flockfile(_fp) /**/
 459 # define _IO_funlockfile(_fp) /**/
 460 # define _IO_ftrylockfile(_fp) /**/
 461 # define _IO_cleanup_region_start(_fct, _fp) /**/
 462 # define _IO_cleanup_region_end(_Doit) /**/
 463 #endif /* !_IO_MTSAFE_IO */
 464
 465 extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
 466                         _IO_va_list, int *__restrict);
 467 extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
 468                          _IO_va_list);
 469 extern _IO_ssize_t _IO_padn (_IO_FILE *, int, _IO_ssize_t);
 470 extern _IO_size_t _IO_sgetn (_IO_FILE *, void *, _IO_size_t);
 471
 472 extern _IO_off64_t _IO_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 473 extern _IO_off64_t _IO_seekpos (_IO_FILE *, _IO_off64_t, int);
 474
 475 extern void _IO_free_backup_area (_IO_FILE *) __THROW;
 476
 477 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 478 extern _IO_wint_t _IO_getwc (_IO_FILE *__fp);
 479 extern _IO_wint_t _IO_putwc (wchar_t __wc, _IO_FILE *__fp);
 480 extern int _IO_fwide (_IO_FILE *__fp, int __mode) __THROW;
 481 # if __GNUC__ >= 2
 482 /* While compiling glibc we have to handle compatibility with very old
 483    versions.  */
 484 #  if defined _LIBC && defined SHARED
 485 #   include <shlib-compat.h>
 486 #   if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
 487 #    define _IO_fwide_maybe_incompatible \
 488   (__builtin_expect (&_IO_stdin_used == NULL, 0))
 489 extern const int _IO_stdin_used;
 490 weak_extern (_IO_stdin_used);
 491 #   endif
 492 #  endif
 493 #  ifndef _IO_fwide_maybe_incompatible
 494 #   define _IO_fwide_maybe_incompatible (0)
 495 #  endif
 496 /* A special optimized version of the function above.  It optimizes the
 497    case of initializing an unoriented byte stream.  */
 498 #  define _IO_fwide(__fp, __mode) \
 499   ({ int __result = (__mode);                                                 \
 500      if (__result < 0 && ! _IO_fwide_maybe_incompatible)                      \
 501        {                                                                      \
 502          if ((__fp)->_mode == 0)                                              \
 503            /* We know that all we have to do is to set the flag.  */          \
 504            (__fp)->_mode = -1;                                                \
 505          __result = (__fp)->_mode;                                            \
 506        }                                                                      \
 507      else if (__builtin_constant_p (__mode) && (__mode) == 0)                 \
 508        __result = _IO_fwide_maybe_incompatible ? -1 : (__fp)->_mode;          \
 509      else                                                                     \
 510        __result = _IO_fwide (__fp, __result);                                 \
 511      __result; })
 512 # endif
 513
 514 extern int _IO_vfwscanf (_IO_FILE * __restrict, const wchar_t * __restrict,
 515                          _IO_va_list, int *__restrict);
 516 extern int _IO_vfwprintf (_IO_FILE *__restrict, const wchar_t *__restrict,
 517                           _IO_va_list);
 518 extern _IO_ssize_t _IO_wpadn (_IO_FILE *, wint_t, _IO_ssize_t);
 519 extern void _IO_free_wbackup_area (_IO_FILE *) __THROW;
 520 #endif
 521
 522 #ifdef __LDBL_COMPAT
 523 # include <bits/libio-ldbl.h>
 524 #endif
 525
 526 #ifdef __cplusplus
 527 }
 528 #endif
 529
 530 #endif /* _IO_STDIO_H */