libio/libio.h

   1 /* Copyright (C) 1991-1995,1997-2003,2004,2005 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Written by Per Bothner <bothner@cygnus.com>.
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.
  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_pos_t _G_fpos_t /* obsolete */
  35 #define _IO_fpos_t _G_fpos_t
  36 #define _IO_fpos64_t _G_fpos64_t
  37 #define _IO_size_t _G_size_t
  38 #define _IO_ssize_t _G_ssize_t
  39 #define _IO_off_t _G_off_t
  40 #define _IO_off64_t _G_off64_t
  41 #define _IO_pid_t _G_pid_t
  42 #define _IO_uid_t _G_uid_t
  43 #define _IO_iconv_t _G_iconv_t
  44 #define _IO_HAVE_SYS_WAIT _G_HAVE_SYS_WAIT
  45 #define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE
  46 #define _IO_BUFSIZ _G_BUFSIZ
  47 #define _IO_va_list _G_va_list
  48 #define _IO_wint_t _G_wint_t
  49
  50 #ifdef _G_NEED_STDARG_H
  51 /* This define avoids name pollution if we're using GNU stdarg.h */
  52 # define __need___va_list
  53 # include <stdarg.h>
  54 # ifdef __GNUC_VA_LIST
  55 #  undef _IO_va_list
  56 #  define _IO_va_list __gnuc_va_list
  57 # endif /* __GNUC_VA_LIST */
  58 #endif
  59
  60 #ifndef __P
  61 # if _G_HAVE_SYS_CDEFS
  62 #  include <sys/cdefs.h>
  63 # else
  64 #  ifdef __STDC__
  65 #   define __P(p) p
  66 #   define __PMT(p) p
  67 #  else
  68 #   define __P(p) ()
  69 #   define __PMT(p) ()
  70 #  endif
  71 # endif
  72 #endif /*!__P*/
  73
  74 /* For backward compatibility */
  75 #ifndef _PARAMS
  76 # define _PARAMS(protos) __P(protos)
  77 #endif /*!_PARAMS*/
  78
  79 #ifndef __STDC__
  80 # ifndef const
  81 #  define const
  82 # endif
  83 #endif
  84 #define _IO_UNIFIED_JUMPTABLES 1
  85 #ifndef _G_HAVE_PRINTF_FP
  86 # define _IO_USE_DTOA 1
  87 #endif
  88
  89 #ifndef EOF
  90 # define EOF (-1)
  91 #endif
  92 #ifndef NULL
  93 # if defined __GNUG__ && \
  94     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
  95 #  define NULL (__null)
  96 # else
  97 #  if !defined(__cplusplus)
  98 #   define NULL ((void*)0)
  99 #  else
 100 #   define NULL (0)
 101 #  endif
 102 # endif
 103 #endif
 104
 105 #define _IOS_INPUT      1
 106 #define _IOS_OUTPUT     2
 107 #define _IOS_ATEND      4
 108 #define _IOS_APPEND     8
 109 #define _IOS_TRUNC      16
 110 #define _IOS_NOCREATE   32
 111 #define _IOS_NOREPLACE  64
 112 #define _IOS_BIN        128
 113
 114 /* Magic numbers and bits for the _flags field.
 115    The magic numbers use the high-order bits of _flags;
 116    the remaining bits are available for variable flags.
 117    Note: The magic numbers must all be negative if stdio
 118    emulation is desired. */
 119
 120 #define _IO_MAGIC 0xFBAD0000 /* Magic number */
 121 #define _OLD_STDIO_MAGIC 0xFABC0000 /* Emulate old stdio. */
 122 #define _IO_MAGIC_MASK 0xFFFF0000
 123 #define _IO_USER_BUF 1 /* User owns buffer; don't delete it on close. */
 124 #define _IO_UNBUFFERED 2
 125 #define _IO_NO_READS 4 /* Reading not allowed */
 126 #define _IO_NO_WRITES 8 /* Writing not allowd */
 127 #define _IO_EOF_SEEN 0x10
 128 #define _IO_ERR_SEEN 0x20
 129 #define _IO_DELETE_DONT_CLOSE 0x40 /* Don't call close(_fileno) on cleanup. */
 130 #define _IO_LINKED 0x80 /* Set if linked (using _chain) to streambuf::_list_all.*/
 131 #define _IO_IN_BACKUP 0x100
 132 #define _IO_LINE_BUF 0x200
 133 #define _IO_TIED_PUT_GET 0x400 /* Set if put and get pointer logicly tied. */
 134 #define _IO_CURRENTLY_PUTTING 0x800
 135 #define _IO_IS_APPENDING 0x1000
 136 #define _IO_IS_FILEBUF 0x2000
 137 #define _IO_BAD_SEEN 0x4000
 138 #define _IO_USER_LOCK 0x8000
 139
 140 #define _IO_FLAGS2_MMAP 1
 141 #define _IO_FLAGS2_NOTCANCEL 2
 142 #ifdef _LIBC
 143 # define _IO_FLAGS2_FORTIFY 4
 144 #endif
 145
 146 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 147 #define _IO_SKIPWS 01
 148 #define _IO_LEFT 02
 149 #define _IO_RIGHT 04
 150 #define _IO_INTERNAL 010
 151 #define _IO_DEC 020
 152 #define _IO_OCT 040
 153 #define _IO_HEX 0100
 154 #define _IO_SHOWBASE 0200
 155 #define _IO_SHOWPOINT 0400
 156 #define _IO_UPPERCASE 01000
 157 #define _IO_SHOWPOS 02000
 158 #define _IO_SCIENTIFIC 04000
 159 #define _IO_FIXED 010000
 160 #define _IO_UNITBUF 020000
 161 #define _IO_STDIO 040000
 162 #define _IO_DONT_CLOSE 0100000
 163 #define _IO_BOOLALPHA 0200000
 164
 165
 166 struct _IO_jump_t;  struct _IO_FILE;
 167
 168 /* Handle lock.  */
 169 #ifdef _IO_MTSAFE_IO
 170 # if defined __GLIBC__ && __GLIBC__ >= 2
 171 #  include <bits/stdio-lock.h>
 172 # else
 173 /*# include <comthread.h>*/
 174 # endif
 175 #else
 176 typedef void _IO_lock_t;
 177 #endif
 178
 179
 180 /* A streammarker remembers a position in a buffer. */
 181
 182 struct _IO_marker {
 183   struct _IO_marker *_next;
 184   struct _IO_FILE *_sbuf;
 185   /* If _pos >= 0
 186  it points to _buf->Gbase()+_pos. FIXME comment */
 187   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 188   int _pos;
 189 #if 0
 190     void set_streampos(streampos sp) { _spos = sp; }
 191     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 192   public:
 193     streammarker(streambuf *sb);
 194     ~streammarker();
 195     int saving() { return  _spos == -2; }
 196     int delta(streammarker&);
 197     int delta();
 198 #endif
 199 };
 200
 201 /* This is the structure from the libstdc++ codecvt class.  */
 202 enum __codecvt_result
 203 {
 204   __codecvt_ok,
 205   __codecvt_partial,
 206   __codecvt_error,
 207   __codecvt_noconv
 208 };
 209
 210 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 211 /* The order of the elements in the following struct must match the order
 212    of the virtual functions in the libstdc++ codecvt class.  */
 213 struct _IO_codecvt
 214 {
 215   void (*__codecvt_destr) (struct _IO_codecvt *);
 216   enum __codecvt_result (*__codecvt_do_out) (struct _IO_codecvt *,
 217                                              __mbstate_t *,
 218                                              const wchar_t *,
 219                                              const wchar_t *,
 220                                              const wchar_t **, char *,
 221                                              char *, char **);
 222   enum __codecvt_result (*__codecvt_do_unshift) (struct _IO_codecvt *,
 223                                                  __mbstate_t *, char *,
 224                                                  char *, char **);
 225   enum __codecvt_result (*__codecvt_do_in) (struct _IO_codecvt *,
 226                                             __mbstate_t *,
 227                                             const char *, const char *,
 228                                             const char **, wchar_t *,
 229                                             wchar_t *, wchar_t **);
 230   int (*__codecvt_do_encoding) (struct _IO_codecvt *);
 231   int (*__codecvt_do_always_noconv) (struct _IO_codecvt *);
 232   int (*__codecvt_do_length) (struct _IO_codecvt *, __mbstate_t *,
 233                               const char *, const char *, _IO_size_t);
 234   int (*__codecvt_do_max_length) (struct _IO_codecvt *);
 235
 236   _IO_iconv_t __cd_in;
 237   _IO_iconv_t __cd_out;
 238 };
 239
 240 /* Extra data for wide character streams.  */
 241 struct _IO_wide_data
 242 {
 243   wchar_t *_IO_read_ptr;        /* Current read pointer */
 244   wchar_t *_IO_read_end;        /* End of get area. */
 245   wchar_t *_IO_read_base;       /* Start of putback+get area. */
 246   wchar_t *_IO_write_base;      /* Start of put area. */
 247   wchar_t *_IO_write_ptr;       /* Current put pointer. */
 248   wchar_t *_IO_write_end;       /* End of put area. */
 249   wchar_t *_IO_buf_base;        /* Start of reserve area. */
 250   wchar_t *_IO_buf_end;         /* End of reserve area. */
 251   /* The following fields are used to support backing up and undo. */
 252   wchar_t *_IO_save_base;       /* Pointer to start of non-current get area. */
 253   wchar_t *_IO_backup_base;     /* Pointer to first valid character of
 254                                    backup area */
 255   wchar_t *_IO_save_end;        /* Pointer to end of non-current get area. */
 256
 257   __mbstate_t _IO_state;
 258   __mbstate_t _IO_last_state;
 259   struct _IO_codecvt _codecvt;
 260
 261   wchar_t _shortbuf[1];
 262
 263   const struct _IO_jump_t *_wide_vtable;
 264 };
 265 #endif
 266
 267 struct _IO_FILE {
 268   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 269 #define _IO_file_flags _flags
 270
 271   /* The following pointers correspond to the C++ streambuf protocol. */
 272   /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
 273   char* _IO_read_ptr;   /* Current read pointer */
 274   char* _IO_read_end;   /* End of get area. */
 275   char* _IO_read_base;  /* Start of putback+get area. */
 276   char* _IO_write_base; /* Start of put area. */
 277   char* _IO_write_ptr;  /* Current put pointer. */
 278   char* _IO_write_end;  /* End of put area. */
 279   char* _IO_buf_base;   /* Start of reserve area. */
 280   char* _IO_buf_end;    /* End of reserve area. */
 281   /* The following fields are used to support backing up and undo. */
 282   char *_IO_save_base; /* Pointer to start of non-current get area. */
 283   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 284   char *_IO_save_end; /* Pointer to end of non-current get area. */
 285
 286   struct _IO_marker *_markers;
 287
 288   struct _IO_FILE *_chain;
 289
 290   int _fileno;
 291 #if 0
 292   int _blksize;
 293 #else
 294   int _flags2;
 295 #endif
 296   _IO_off_t _old_offset; /* This used to be _offset but it's too small.  */
 297
 298 #define __HAVE_COLUMN /* temporary */
 299   /* 1+column number of pbase(); 0 is unknown. */
 300   unsigned short _cur_column;
 301   signed char _vtable_offset;
 302   char _shortbuf[1];
 303
 304   /*  char* _save_gptr;  char* _save_egptr; */
 305
 306   _IO_lock_t *_lock;
 307 #ifdef _IO_USE_OLD_IO_FILE
 308 };
 309
 310 struct _IO_FILE_complete
 311 {
 312   struct _IO_FILE _file;
 313 #endif
 314 #if defined _G_IO_IO_FILE_VERSION && _G_IO_IO_FILE_VERSION == 0x20001
 315   _IO_off64_t _offset;
 316 # if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 317   /* Wide character stream stuff.  */
 318   struct _IO_codecvt *_codecvt;
 319   struct _IO_wide_data *_wide_data;
 320 # else
 321   void *__pad1;
 322   void *__pad2;
 323 # endif
 324   int _mode;
 325   /* Make sure we don't get into trouble again.  */
 326   char _unused2[15 * sizeof (int) - 2 * sizeof (void *)];
 327 #endif
 328 };
 329
 330 #ifndef __cplusplus
 331 typedef struct _IO_FILE _IO_FILE;
 332 #endif
 333
 334 struct _IO_FILE_plus;
 335
 336 extern struct _IO_FILE_plus _IO_2_1_stdin_;
 337 extern struct _IO_FILE_plus _IO_2_1_stdout_;
 338 extern struct _IO_FILE_plus _IO_2_1_stderr_;
 339 #ifndef _LIBC
 340 #define _IO_stdin ((_IO_FILE*)(&_IO_2_1_stdin_))
 341 #define _IO_stdout ((_IO_FILE*)(&_IO_2_1_stdout_))
 342 #define _IO_stderr ((_IO_FILE*)(&_IO_2_1_stderr_))
 343 #else
 344 extern _IO_FILE *_IO_stdin attribute_hidden;
 345 extern _IO_FILE *_IO_stdout attribute_hidden;
 346 extern _IO_FILE *_IO_stderr attribute_hidden;
 347 #endif
 348
 349
 350 /* Functions to do I/O and file management for a stream.  */
 351
 352 /* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
 353    Return number of bytes read.  */
 354 typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);
 355
 356 /* Write N bytes pointed to by BUF to COOKIE.  Write all N bytes
 357    unless there is an error.  Return number of bytes written, or -1 if
 358    there is an error without writing anything.  If the file has been
 359    opened for append (__mode.__append set), then set the file pointer
 360    to the end of the file and then do the write; if not, just write at
 361    the current file pointer.  */
 362 typedef __ssize_t __io_write_fn (void *__cookie, __const char *__buf,
 363                                  size_t __n);
 364
 365 /* Move COOKIE's file position to *POS bytes from the
 366    beginning of the file (if W is SEEK_SET),
 367    the current position (if W is SEEK_CUR),
 368    or the end of the file (if W is SEEK_END).
 369    Set *POS to the new file position.
 370    Returns zero if successful, nonzero if not.  */
 371 typedef int __io_seek_fn (void *__cookie, _IO_off64_t *__pos, int __w);
 372
 373 /* Close COOKIE.  */
 374 typedef int __io_close_fn (void *__cookie);
 375
 376
 377 #ifdef _GNU_SOURCE
 378 /* User-visible names for the above.  */
 379 typedef __io_read_fn cookie_read_function_t;
 380 typedef __io_write_fn cookie_write_function_t;
 381 typedef __io_seek_fn cookie_seek_function_t;
 382 typedef __io_close_fn cookie_close_function_t;
 383
 384 /* The structure with the cookie function pointers.  */
 385 typedef struct
 386 {
 387   __io_read_fn *read;           /* Read bytes.  */
 388   __io_write_fn *write;         /* Write bytes.  */
 389   __io_seek_fn *seek;           /* Seek/tell file position.  */
 390   __io_close_fn *close;         /* Close file.  */
 391 } _IO_cookie_io_functions_t;
 392 typedef _IO_cookie_io_functions_t cookie_io_functions_t;
 393
 394 struct _IO_cookie_file;
 395
 396 /* Initialize one of those.  */
 397 extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
 398                              void *__cookie, _IO_cookie_io_functions_t __fns);
 399 #endif
 400
 401
 402 #ifdef __cplusplus
 403 extern "C" {
 404 #endif
 405
 406 extern int __underflow (_IO_FILE *) __THROW;
 407 extern int __uflow (_IO_FILE *) __THROW;
 408 extern int __overflow (_IO_FILE *, int) __THROW;
 409 extern _IO_wint_t __wunderflow (_IO_FILE *) __THROW;
 410 extern _IO_wint_t __wuflow (_IO_FILE *) __THROW;
 411 extern _IO_wint_t __woverflow (_IO_FILE *, _IO_wint_t) __THROW;
 412
 413 #if  __GNUC__ >= 3
 414 # define _IO_BE(expr, res) __builtin_expect ((expr), res)
 415 #else
 416 # define _IO_BE(expr, res) (expr)
 417 #endif
 418
 419 #define _IO_getc_unlocked(_fp) \
 420        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 421         ? __uflow (_fp) : *(unsigned char *) (_fp)->_IO_read_ptr++)
 422 #define _IO_peekc_unlocked(_fp) \
 423        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 424           && __underflow (_fp) == EOF ? EOF \
 425         : *(unsigned char *) (_fp)->_IO_read_ptr)
 426 #define _IO_putc_unlocked(_ch, _fp) \
 427    (_IO_BE ((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end, 0) \
 428     ? __overflow (_fp, (unsigned char) (_ch)) \
 429     : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))
 430
 431 #define _IO_getwc_unlocked(_fp) \
 432   (_IO_BE ((_fp)->_wide_data->_IO_read_ptr >= (_fp)->_wide_data->_IO_read_end,\
 433            0) \
 434    ? __wuflow (_fp) : (_IO_wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
 435 #define _IO_putwc_unlocked(_wch, _fp) \
 436   (_IO_BE ((_fp)->_wide_data->_IO_write_ptr \
 437            >= (_fp)->_wide_data->_IO_write_end, 0) \
 438    ? __woverflow (_fp, _wch) \
 439    : (_IO_wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))
 440
 441 #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 442 #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 443
 444 extern int _IO_getc (_IO_FILE *__fp) __THROW;
 445 extern int _IO_putc (int __c, _IO_FILE *__fp) __THROW;
 446 extern int _IO_feof (_IO_FILE *__fp) __THROW;
 447 extern int _IO_ferror (_IO_FILE *__fp) __THROW;
 448
 449 extern int _IO_peekc_locked (_IO_FILE *__fp) __THROW;
 450
 451 /* This one is for Emacs. */
 452 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 453         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 454
 455 extern void _IO_flockfile (_IO_FILE *) __THROW;
 456 extern void _IO_funlockfile (_IO_FILE *) __THROW;
 457 extern int _IO_ftrylockfile (_IO_FILE *) __THROW;
 458
 459 #ifdef _IO_MTSAFE_IO
 460 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
 461 # define _IO_flockfile(_fp) \
 462   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_flockfile (_fp)
 463 # define _IO_funlockfile(_fp) \
 464   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_funlockfile (_fp)
 465 #else
 466 # define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 467 # define _IO_flockfile(_fp) /**/
 468 # define _IO_funlockfile(_fp) /**/
 469 # define _IO_ftrylockfile(_fp) /**/
 470 # define _IO_cleanup_region_start(_fct, _fp) /**/
 471 # define _IO_cleanup_region_end(_Doit) /**/
 472 #endif /* !_IO_MTSAFE_IO */
 473
 474 extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
 475                         _IO_va_list, int *__restrict) __THROW;
 476 extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
 477                          _IO_va_list) __THROW;
 478 extern _IO_ssize_t _IO_padn (_IO_FILE *, int, _IO_ssize_t) __THROW;
 479 extern _IO_size_t _IO_sgetn (_IO_FILE *, void *, _IO_size_t) __THROW;
 480
 481 extern _IO_off64_t _IO_seekoff (_IO_FILE *, _IO_off64_t, int, int) __THROW;
 482 extern _IO_off64_t _IO_seekpos (_IO_FILE *, _IO_off64_t, int) __THROW;
 483
 484 extern void _IO_free_backup_area (_IO_FILE *) __THROW;
 485
 486 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 487 extern _IO_wint_t _IO_getwc (_IO_FILE *__fp) __THROW;
 488 extern _IO_wint_t _IO_putwc (wchar_t __wc, _IO_FILE *__fp) __THROW;
 489 extern int _IO_fwide (_IO_FILE *__fp, int __mode) __THROW;
 490 # if __GNUC__ >= 2
 491 /* While compiling glibc we have to handle compatibility with very old
 492    versions.  */
 493 #  if defined _LIBC && defined SHARED
 494 #   include <shlib-compat.h>
 495 #   if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
 496 #    define _IO_fwide_maybe_incompatible \
 497   (__builtin_expect (&_IO_stdin_used == NULL, 0))
 498 extern const int _IO_stdin_used;
 499 weak_extern (_IO_stdin_used);
 500 #   endif
 501 #  endif
 502 #  ifndef _IO_fwide_maybe_incompatible
 503 #   define _IO_fwide_maybe_incompatible (0)
 504 #  endif
 505 /* A special optimized version of the function above.  It optimizes the
 506    case of initializing an unoriented byte stream.  */
 507 #  define _IO_fwide(__fp, __mode) \
 508   ({ int __result = (__mode);                                                 \
 509      if (__result < 0 && ! _IO_fwide_maybe_incompatible)                      \
 510        {                                                                      \
 511          if ((__fp)->_mode == 0)                                              \
 512            /* We know that all we have to do is to set the flag.  */          \
 513            (__fp)->_mode = -1;                                                \
 514          __result = (__fp)->_mode;                                            \
 515        }                                                                      \
 516      else if (__builtin_constant_p (__mode) && (__mode) == 0)                 \
 517        __result = _IO_fwide_maybe_incompatible ? -1 : (__fp)->_mode;          \
 518      else                                                                     \
 519        __result = _IO_fwide (__fp, __result);                                 \
 520      __result; })
 521 # endif
 522
 523 extern int _IO_vfwscanf (_IO_FILE * __restrict, const wchar_t * __restrict,
 524                          _IO_va_list, int *__restrict) __THROW;
 525 extern int _IO_vfwprintf (_IO_FILE *__restrict, const wchar_t *__restrict,
 526                           _IO_va_list) __THROW;
 527 extern _IO_ssize_t _IO_wpadn (_IO_FILE *, wint_t, _IO_ssize_t) __THROW;
 528 extern void _IO_free_wbackup_area (_IO_FILE *) __THROW;
 529 #endif
 530
 531 #ifdef __cplusplus
 532 }
 533 #endif
 534
 535 #endif /* _IO_STDIO_H */