libio/libio.h

   1 /* Copyright (C) 1991-1995,1997-2005,2006 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 #define _IO_FLAGS2_USER_WBUF 8
 146
 147 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 148 #define _IO_SKIPWS 01
 149 #define _IO_LEFT 02
 150 #define _IO_RIGHT 04
 151 #define _IO_INTERNAL 010
 152 #define _IO_DEC 020
 153 #define _IO_OCT 040
 154 #define _IO_HEX 0100
 155 #define _IO_SHOWBASE 0200
 156 #define _IO_SHOWPOINT 0400
 157 #define _IO_UPPERCASE 01000
 158 #define _IO_SHOWPOS 02000
 159 #define _IO_SCIENTIFIC 04000
 160 #define _IO_FIXED 010000
 161 #define _IO_UNITBUF 020000
 162 #define _IO_STDIO 040000
 163 #define _IO_DONT_CLOSE 0100000
 164 #define _IO_BOOLALPHA 0200000
 165
 166
 167 struct _IO_jump_t;  struct _IO_FILE;
 168
 169 /* Handle lock.  */
 170 #ifdef _IO_MTSAFE_IO
 171 # if defined __GLIBC__ && __GLIBC__ >= 2
 172 #  include <bits/stdio-lock.h>
 173 # else
 174 /*# include <comthread.h>*/
 175 # endif
 176 #else
 177 typedef void _IO_lock_t;
 178 #endif
 179
 180
 181 /* A streammarker remembers a position in a buffer. */
 182
 183 struct _IO_marker {
 184   struct _IO_marker *_next;
 185   struct _IO_FILE *_sbuf;
 186   /* If _pos >= 0
 187  it points to _buf->Gbase()+_pos. FIXME comment */
 188   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 189   int _pos;
 190 #if 0
 191     void set_streampos(streampos sp) { _spos = sp; }
 192     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 193   public:
 194     streammarker(streambuf *sb);
 195     ~streammarker();
 196     int saving() { return  _spos == -2; }
 197     int delta(streammarker&);
 198     int delta();
 199 #endif
 200 };
 201
 202 /* This is the structure from the libstdc++ codecvt class.  */
 203 enum __codecvt_result
 204 {
 205   __codecvt_ok,
 206   __codecvt_partial,
 207   __codecvt_error,
 208   __codecvt_noconv
 209 };
 210
 211 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 212 /* The order of the elements in the following struct must match the order
 213    of the virtual functions in the libstdc++ codecvt class.  */
 214 struct _IO_codecvt
 215 {
 216   void (*__codecvt_destr) (struct _IO_codecvt *);
 217   enum __codecvt_result (*__codecvt_do_out) (struct _IO_codecvt *,
 218                                              __mbstate_t *,
 219                                              const wchar_t *,
 220                                              const wchar_t *,
 221                                              const wchar_t **, char *,
 222                                              char *, char **);
 223   enum __codecvt_result (*__codecvt_do_unshift) (struct _IO_codecvt *,
 224                                                  __mbstate_t *, char *,
 225                                                  char *, char **);
 226   enum __codecvt_result (*__codecvt_do_in) (struct _IO_codecvt *,
 227                                             __mbstate_t *,
 228                                             const char *, const char *,
 229                                             const char **, wchar_t *,
 230                                             wchar_t *, wchar_t **);
 231   int (*__codecvt_do_encoding) (struct _IO_codecvt *);
 232   int (*__codecvt_do_always_noconv) (struct _IO_codecvt *);
 233   int (*__codecvt_do_length) (struct _IO_codecvt *, __mbstate_t *,
 234                               const char *, const char *, _IO_size_t);
 235   int (*__codecvt_do_max_length) (struct _IO_codecvt *);
 236
 237   _IO_iconv_t __cd_in;
 238   _IO_iconv_t __cd_out;
 239 };
 240
 241 /* Extra data for wide character streams.  */
 242 struct _IO_wide_data
 243 {
 244   wchar_t *_IO_read_ptr;        /* Current read pointer */
 245   wchar_t *_IO_read_end;        /* End of get area. */
 246   wchar_t *_IO_read_base;       /* Start of putback+get area. */
 247   wchar_t *_IO_write_base;      /* Start of put area. */
 248   wchar_t *_IO_write_ptr;       /* Current put pointer. */
 249   wchar_t *_IO_write_end;       /* End of put area. */
 250   wchar_t *_IO_buf_base;        /* Start of reserve area. */
 251   wchar_t *_IO_buf_end;         /* End of reserve area. */
 252   /* The following fields are used to support backing up and undo. */
 253   wchar_t *_IO_save_base;       /* Pointer to start of non-current get area. */
 254   wchar_t *_IO_backup_base;     /* Pointer to first valid character of
 255                                    backup area */
 256   wchar_t *_IO_save_end;        /* Pointer to end of non-current get area. */
 257
 258   __mbstate_t _IO_state;
 259   __mbstate_t _IO_last_state;
 260   struct _IO_codecvt _codecvt;
 261
 262   wchar_t _shortbuf[1];
 263
 264   const struct _IO_jump_t *_wide_vtable;
 265 };
 266 #endif
 267
 268 struct _IO_FILE {
 269   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 270 #define _IO_file_flags _flags
 271
 272   /* The following pointers correspond to the C++ streambuf protocol. */
 273   /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
 274   char* _IO_read_ptr;   /* Current read pointer */
 275   char* _IO_read_end;   /* End of get area. */
 276   char* _IO_read_base;  /* Start of putback+get area. */
 277   char* _IO_write_base; /* Start of put area. */
 278   char* _IO_write_ptr;  /* Current put pointer. */
 279   char* _IO_write_end;  /* End of put area. */
 280   char* _IO_buf_base;   /* Start of reserve area. */
 281   char* _IO_buf_end;    /* End of reserve area. */
 282   /* The following fields are used to support backing up and undo. */
 283   char *_IO_save_base; /* Pointer to start of non-current get area. */
 284   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 285   char *_IO_save_end; /* Pointer to end of non-current get area. */
 286
 287   struct _IO_marker *_markers;
 288
 289   struct _IO_FILE *_chain;
 290
 291   int _fileno;
 292 #if 0
 293   int _blksize;
 294 #else
 295   int _flags2;
 296 #endif
 297   _IO_off_t _old_offset; /* This used to be _offset but it's too small.  */
 298
 299 #define __HAVE_COLUMN /* temporary */
 300   /* 1+column number of pbase(); 0 is unknown. */
 301   unsigned short _cur_column;
 302   signed char _vtable_offset;
 303   char _shortbuf[1];
 304
 305   /*  char* _save_gptr;  char* _save_egptr; */
 306
 307   _IO_lock_t *_lock;
 308 #ifdef _IO_USE_OLD_IO_FILE
 309 };
 310
 311 struct _IO_FILE_complete
 312 {
 313   struct _IO_FILE _file;
 314 #endif
 315 #if defined _G_IO_IO_FILE_VERSION && _G_IO_IO_FILE_VERSION == 0x20001
 316   _IO_off64_t _offset;
 317 # if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 318   /* Wide character stream stuff.  */
 319   struct _IO_codecvt *_codecvt;
 320   struct _IO_wide_data *_wide_data;
 321   struct _IO_FILE *_freeres_list;
 322   void *_freeres_buf;
 323   size_t _freeres_size;
 324 # else
 325   void *__pad1;
 326   void *__pad2;
 327   void *__pad3;
 328   void *__pad4;
 329   size_t __pad5;
 330 # endif
 331   int _mode;
 332   /* Make sure we don't get into trouble again.  */
 333   char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
 334 #endif
 335 };
 336
 337 #ifndef __cplusplus
 338 typedef struct _IO_FILE _IO_FILE;
 339 #endif
 340
 341 struct _IO_FILE_plus;
 342
 343 extern struct _IO_FILE_plus _IO_2_1_stdin_;
 344 extern struct _IO_FILE_plus _IO_2_1_stdout_;
 345 extern struct _IO_FILE_plus _IO_2_1_stderr_;
 346 #ifndef _LIBC
 347 #define _IO_stdin ((_IO_FILE*)(&_IO_2_1_stdin_))
 348 #define _IO_stdout ((_IO_FILE*)(&_IO_2_1_stdout_))
 349 #define _IO_stderr ((_IO_FILE*)(&_IO_2_1_stderr_))
 350 #else
 351 extern _IO_FILE *_IO_stdin attribute_hidden;
 352 extern _IO_FILE *_IO_stdout attribute_hidden;
 353 extern _IO_FILE *_IO_stderr attribute_hidden;
 354 #endif
 355
 356
 357 /* Functions to do I/O and file management for a stream.  */
 358
 359 /* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
 360    Return number of bytes read.  */
 361 typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);
 362
 363 /* Write N bytes pointed to by BUF to COOKIE.  Write all N bytes
 364    unless there is an error.  Return number of bytes written, or -1 if
 365    there is an error without writing anything.  If the file has been
 366    opened for append (__mode.__append set), then set the file pointer
 367    to the end of the file and then do the write; if not, just write at
 368    the current file pointer.  */
 369 typedef __ssize_t __io_write_fn (void *__cookie, __const char *__buf,
 370                                  size_t __n);
 371
 372 /* Move COOKIE's file position to *POS bytes from the
 373    beginning of the file (if W is SEEK_SET),
 374    the current position (if W is SEEK_CUR),
 375    or the end of the file (if W is SEEK_END).
 376    Set *POS to the new file position.
 377    Returns zero if successful, nonzero if not.  */
 378 typedef int __io_seek_fn (void *__cookie, _IO_off64_t *__pos, int __w);
 379
 380 /* Close COOKIE.  */
 381 typedef int __io_close_fn (void *__cookie);
 382
 383
 384 #ifdef _GNU_SOURCE
 385 /* User-visible names for the above.  */
 386 typedef __io_read_fn cookie_read_function_t;
 387 typedef __io_write_fn cookie_write_function_t;
 388 typedef __io_seek_fn cookie_seek_function_t;
 389 typedef __io_close_fn cookie_close_function_t;
 390
 391 /* The structure with the cookie function pointers.  */
 392 typedef struct
 393 {
 394   __io_read_fn *read;           /* Read bytes.  */
 395   __io_write_fn *write;         /* Write bytes.  */
 396   __io_seek_fn *seek;           /* Seek/tell file position.  */
 397   __io_close_fn *close;         /* Close file.  */
 398 } _IO_cookie_io_functions_t;
 399 typedef _IO_cookie_io_functions_t cookie_io_functions_t;
 400
 401 struct _IO_cookie_file;
 402
 403 /* Initialize one of those.  */
 404 extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
 405                              void *__cookie, _IO_cookie_io_functions_t __fns);
 406 #endif
 407
 408
 409 #ifdef __cplusplus
 410 extern "C" {
 411 #endif
 412
 413 extern int __underflow (_IO_FILE *) __THROW;
 414 extern int __uflow (_IO_FILE *) __THROW;
 415 extern int __overflow (_IO_FILE *, int) __THROW;
 416 extern _IO_wint_t __wunderflow (_IO_FILE *) __THROW;
 417 extern _IO_wint_t __wuflow (_IO_FILE *) __THROW;
 418 extern _IO_wint_t __woverflow (_IO_FILE *, _IO_wint_t) __THROW;
 419
 420 #if  __GNUC__ >= 3
 421 # define _IO_BE(expr, res) __builtin_expect ((expr), res)
 422 #else
 423 # define _IO_BE(expr, res) (expr)
 424 #endif
 425
 426 #define _IO_getc_unlocked(_fp) \
 427        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 428         ? __uflow (_fp) : *(unsigned char *) (_fp)->_IO_read_ptr++)
 429 #define _IO_peekc_unlocked(_fp) \
 430        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 431           && __underflow (_fp) == EOF ? EOF \
 432         : *(unsigned char *) (_fp)->_IO_read_ptr)
 433 #define _IO_putc_unlocked(_ch, _fp) \
 434    (_IO_BE ((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end, 0) \
 435     ? __overflow (_fp, (unsigned char) (_ch)) \
 436     : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))
 437
 438 #define _IO_getwc_unlocked(_fp) \
 439   (_IO_BE ((_fp)->_wide_data->_IO_read_ptr >= (_fp)->_wide_data->_IO_read_end,\
 440            0) \
 441    ? __wuflow (_fp) : (_IO_wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
 442 #define _IO_putwc_unlocked(_wch, _fp) \
 443   (_IO_BE ((_fp)->_wide_data->_IO_write_ptr \
 444            >= (_fp)->_wide_data->_IO_write_end, 0) \
 445    ? __woverflow (_fp, _wch) \
 446    : (_IO_wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))
 447
 448 #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 449 #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 450
 451 extern int _IO_getc (_IO_FILE *__fp) __THROW;
 452 extern int _IO_putc (int __c, _IO_FILE *__fp) __THROW;
 453 extern int _IO_feof (_IO_FILE *__fp) __THROW;
 454 extern int _IO_ferror (_IO_FILE *__fp) __THROW;
 455
 456 extern int _IO_peekc_locked (_IO_FILE *__fp) __THROW;
 457
 458 /* This one is for Emacs. */
 459 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 460         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 461
 462 extern void _IO_flockfile (_IO_FILE *) __THROW;
 463 extern void _IO_funlockfile (_IO_FILE *) __THROW;
 464 extern int _IO_ftrylockfile (_IO_FILE *) __THROW;
 465
 466 #ifdef _IO_MTSAFE_IO
 467 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
 468 # define _IO_flockfile(_fp) \
 469   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_flockfile (_fp)
 470 # define _IO_funlockfile(_fp) \
 471   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_funlockfile (_fp)
 472 #else
 473 # define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 474 # define _IO_flockfile(_fp) /**/
 475 # define _IO_funlockfile(_fp) /**/
 476 # define _IO_ftrylockfile(_fp) /**/
 477 # define _IO_cleanup_region_start(_fct, _fp) /**/
 478 # define _IO_cleanup_region_end(_Doit) /**/
 479 #endif /* !_IO_MTSAFE_IO */
 480
 481 extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
 482                         _IO_va_list, int *__restrict);
 483 extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
 484                          _IO_va_list);
 485 extern _IO_ssize_t _IO_padn (_IO_FILE *, int, _IO_ssize_t) __THROW;
 486 extern _IO_size_t _IO_sgetn (_IO_FILE *, void *, _IO_size_t) __THROW;
 487
 488 extern _IO_off64_t _IO_seekoff (_IO_FILE *, _IO_off64_t, int, int) __THROW;
 489 extern _IO_off64_t _IO_seekpos (_IO_FILE *, _IO_off64_t, int) __THROW;
 490
 491 extern void _IO_free_backup_area (_IO_FILE *) __THROW;
 492
 493 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 494 extern _IO_wint_t _IO_getwc (_IO_FILE *__fp) __THROW;
 495 extern _IO_wint_t _IO_putwc (wchar_t __wc, _IO_FILE *__fp) __THROW;
 496 extern int _IO_fwide (_IO_FILE *__fp, int __mode) __THROW;
 497 # if __GNUC__ >= 2
 498 /* While compiling glibc we have to handle compatibility with very old
 499    versions.  */
 500 #  if defined _LIBC && defined SHARED
 501 #   include <shlib-compat.h>
 502 #   if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
 503 #    define _IO_fwide_maybe_incompatible \
 504   (__builtin_expect (&_IO_stdin_used == NULL, 0))
 505 extern const int _IO_stdin_used;
 506 weak_extern (_IO_stdin_used);
 507 #   endif
 508 #  endif
 509 #  ifndef _IO_fwide_maybe_incompatible
 510 #   define _IO_fwide_maybe_incompatible (0)
 511 #  endif
 512 /* A special optimized version of the function above.  It optimizes the
 513    case of initializing an unoriented byte stream.  */
 514 #  define _IO_fwide(__fp, __mode) \
 515   ({ int __result = (__mode);                                                 \
 516      if (__result < 0 && ! _IO_fwide_maybe_incompatible)                      \
 517        {                                                                      \
 518          if ((__fp)->_mode == 0)                                              \
 519            /* We know that all we have to do is to set the flag.  */          \
 520            (__fp)->_mode = -1;                                                \
 521          __result = (__fp)->_mode;                                            \
 522        }                                                                      \
 523      else if (__builtin_constant_p (__mode) && (__mode) == 0)                 \
 524        __result = _IO_fwide_maybe_incompatible ? -1 : (__fp)->_mode;          \
 525      else                                                                     \
 526        __result = _IO_fwide (__fp, __result);                                 \
 527      __result; })
 528 # endif
 529
 530 extern int _IO_vfwscanf (_IO_FILE * __restrict, const wchar_t * __restrict,
 531                          _IO_va_list, int *__restrict);
 532 extern int _IO_vfwprintf (_IO_FILE *__restrict, const wchar_t *__restrict,
 533                           _IO_va_list);
 534 extern _IO_ssize_t _IO_wpadn (_IO_FILE *, wint_t, _IO_ssize_t) __THROW;
 535 extern void _IO_free_wbackup_area (_IO_FILE *) __THROW;
 536 #endif
 537
 538 #ifdef __LDBL_COMPAT
 539 # include <bits/libio-ldbl.h>
 540 #endif
 541
 542 #ifdef __cplusplus
 543 }
 544 #endif
 545
 546 #endif /* _IO_STDIO_H */