libio/libio.h

   1 /* Copyright (C) 1991-1995,1997-2006,2007 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 #ifdef _LIBC
 147 # define _IO_FLAGS2_SCANF_STD 16
 148 #endif
 149
 150 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 151 #define _IO_SKIPWS 01
 152 #define _IO_LEFT 02
 153 #define _IO_RIGHT 04
 154 #define _IO_INTERNAL 010
 155 #define _IO_DEC 020
 156 #define _IO_OCT 040
 157 #define _IO_HEX 0100
 158 #define _IO_SHOWBASE 0200
 159 #define _IO_SHOWPOINT 0400
 160 #define _IO_UPPERCASE 01000
 161 #define _IO_SHOWPOS 02000
 162 #define _IO_SCIENTIFIC 04000
 163 #define _IO_FIXED 010000
 164 #define _IO_UNITBUF 020000
 165 #define _IO_STDIO 040000
 166 #define _IO_DONT_CLOSE 0100000
 167 #define _IO_BOOLALPHA 0200000
 168
 169
 170 struct _IO_jump_t;  struct _IO_FILE;
 171
 172 /* Handle lock.  */
 173 #ifdef _IO_MTSAFE_IO
 174 # if defined __GLIBC__ && __GLIBC__ >= 2
 175 #  include <bits/stdio-lock.h>
 176 # else
 177 /*# include <comthread.h>*/
 178 # endif
 179 #else
 180 typedef void _IO_lock_t;
 181 #endif
 182
 183
 184 /* A streammarker remembers a position in a buffer. */
 185
 186 struct _IO_marker {
 187   struct _IO_marker *_next;
 188   struct _IO_FILE *_sbuf;
 189   /* If _pos >= 0
 190  it points to _buf->Gbase()+_pos. FIXME comment */
 191   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 192   int _pos;
 193 #if 0
 194     void set_streampos(streampos sp) { _spos = sp; }
 195     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 196   public:
 197     streammarker(streambuf *sb);
 198     ~streammarker();
 199     int saving() { return  _spos == -2; }
 200     int delta(streammarker&);
 201     int delta();
 202 #endif
 203 };
 204
 205 /* This is the structure from the libstdc++ codecvt class.  */
 206 enum __codecvt_result
 207 {
 208   __codecvt_ok,
 209   __codecvt_partial,
 210   __codecvt_error,
 211   __codecvt_noconv
 212 };
 213
 214 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 215 /* The order of the elements in the following struct must match the order
 216    of the virtual functions in the libstdc++ codecvt class.  */
 217 struct _IO_codecvt
 218 {
 219   void (*__codecvt_destr) (struct _IO_codecvt *);
 220   enum __codecvt_result (*__codecvt_do_out) (struct _IO_codecvt *,
 221                                              __mbstate_t *,
 222                                              const wchar_t *,
 223                                              const wchar_t *,
 224                                              const wchar_t **, char *,
 225                                              char *, char **);
 226   enum __codecvt_result (*__codecvt_do_unshift) (struct _IO_codecvt *,
 227                                                  __mbstate_t *, char *,
 228                                                  char *, char **);
 229   enum __codecvt_result (*__codecvt_do_in) (struct _IO_codecvt *,
 230                                             __mbstate_t *,
 231                                             const char *, const char *,
 232                                             const char **, wchar_t *,
 233                                             wchar_t *, wchar_t **);
 234   int (*__codecvt_do_encoding) (struct _IO_codecvt *);
 235   int (*__codecvt_do_always_noconv) (struct _IO_codecvt *);
 236   int (*__codecvt_do_length) (struct _IO_codecvt *, __mbstate_t *,
 237                               const char *, const char *, _IO_size_t);
 238   int (*__codecvt_do_max_length) (struct _IO_codecvt *);
 239
 240   _IO_iconv_t __cd_in;
 241   _IO_iconv_t __cd_out;
 242 };
 243
 244 /* Extra data for wide character streams.  */
 245 struct _IO_wide_data
 246 {
 247   wchar_t *_IO_read_ptr;        /* Current read pointer */
 248   wchar_t *_IO_read_end;        /* End of get area. */
 249   wchar_t *_IO_read_base;       /* Start of putback+get area. */
 250   wchar_t *_IO_write_base;      /* Start of put area. */
 251   wchar_t *_IO_write_ptr;       /* Current put pointer. */
 252   wchar_t *_IO_write_end;       /* End of put area. */
 253   wchar_t *_IO_buf_base;        /* Start of reserve area. */
 254   wchar_t *_IO_buf_end;         /* End of reserve area. */
 255   /* The following fields are used to support backing up and undo. */
 256   wchar_t *_IO_save_base;       /* Pointer to start of non-current get area. */
 257   wchar_t *_IO_backup_base;     /* Pointer to first valid character of
 258                                    backup area */
 259   wchar_t *_IO_save_end;        /* Pointer to end of non-current get area. */
 260
 261   __mbstate_t _IO_state;
 262   __mbstate_t _IO_last_state;
 263   struct _IO_codecvt _codecvt;
 264
 265   wchar_t _shortbuf[1];
 266
 267   const struct _IO_jump_t *_wide_vtable;
 268 };
 269 #endif
 270
 271 struct _IO_FILE {
 272   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 273 #define _IO_file_flags _flags
 274
 275   /* The following pointers correspond to the C++ streambuf protocol. */
 276   /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
 277   char* _IO_read_ptr;   /* Current read pointer */
 278   char* _IO_read_end;   /* End of get area. */
 279   char* _IO_read_base;  /* Start of putback+get area. */
 280   char* _IO_write_base; /* Start of put area. */
 281   char* _IO_write_ptr;  /* Current put pointer. */
 282   char* _IO_write_end;  /* End of put area. */
 283   char* _IO_buf_base;   /* Start of reserve area. */
 284   char* _IO_buf_end;    /* End of reserve area. */
 285   /* The following fields are used to support backing up and undo. */
 286   char *_IO_save_base; /* Pointer to start of non-current get area. */
 287   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 288   char *_IO_save_end; /* Pointer to end of non-current get area. */
 289
 290   struct _IO_marker *_markers;
 291
 292   struct _IO_FILE *_chain;
 293
 294   int _fileno;
 295 #if 0
 296   int _blksize;
 297 #else
 298   int _flags2;
 299 #endif
 300   _IO_off_t _old_offset; /* This used to be _offset but it's too small.  */
 301
 302 #define __HAVE_COLUMN /* temporary */
 303   /* 1+column number of pbase(); 0 is unknown. */
 304   unsigned short _cur_column;
 305   signed char _vtable_offset;
 306   char _shortbuf[1];
 307
 308   /*  char* _save_gptr;  char* _save_egptr; */
 309
 310   _IO_lock_t *_lock;
 311 #ifdef _IO_USE_OLD_IO_FILE
 312 };
 313
 314 struct _IO_FILE_complete
 315 {
 316   struct _IO_FILE _file;
 317 #endif
 318 #if defined _G_IO_IO_FILE_VERSION && _G_IO_IO_FILE_VERSION == 0x20001
 319   _IO_off64_t _offset;
 320 # if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 321   /* Wide character stream stuff.  */
 322   struct _IO_codecvt *_codecvt;
 323   struct _IO_wide_data *_wide_data;
 324   struct _IO_FILE *_freeres_list;
 325   void *_freeres_buf;
 326   size_t _freeres_size;
 327 # else
 328   void *__pad1;
 329   void *__pad2;
 330   void *__pad3;
 331   void *__pad4;
 332   size_t __pad5;
 333 # endif
 334   int _mode;
 335   /* Make sure we don't get into trouble again.  */
 336   char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
 337 #endif
 338 };
 339
 340 #ifndef __cplusplus
 341 typedef struct _IO_FILE _IO_FILE;
 342 #endif
 343
 344 struct _IO_FILE_plus;
 345
 346 extern struct _IO_FILE_plus _IO_2_1_stdin_;
 347 extern struct _IO_FILE_plus _IO_2_1_stdout_;
 348 extern struct _IO_FILE_plus _IO_2_1_stderr_;
 349 #ifndef _LIBC
 350 #define _IO_stdin ((_IO_FILE*)(&_IO_2_1_stdin_))
 351 #define _IO_stdout ((_IO_FILE*)(&_IO_2_1_stdout_))
 352 #define _IO_stderr ((_IO_FILE*)(&_IO_2_1_stderr_))
 353 #else
 354 extern _IO_FILE *_IO_stdin attribute_hidden;
 355 extern _IO_FILE *_IO_stdout attribute_hidden;
 356 extern _IO_FILE *_IO_stderr attribute_hidden;
 357 #endif
 358
 359
 360 /* Functions to do I/O and file management for a stream.  */
 361
 362 /* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
 363    Return number of bytes read.  */
 364 typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);
 365
 366 /* Write N bytes pointed to by BUF to COOKIE.  Write all N bytes
 367    unless there is an error.  Return number of bytes written, or -1 if
 368    there is an error without writing anything.  If the file has been
 369    opened for append (__mode.__append set), then set the file pointer
 370    to the end of the file and then do the write; if not, just write at
 371    the current file pointer.  */
 372 typedef __ssize_t __io_write_fn (void *__cookie, __const char *__buf,
 373                                  size_t __n);
 374
 375 /* Move COOKIE's file position to *POS bytes from the
 376    beginning of the file (if W is SEEK_SET),
 377    the current position (if W is SEEK_CUR),
 378    or the end of the file (if W is SEEK_END).
 379    Set *POS to the new file position.
 380    Returns zero if successful, nonzero if not.  */
 381 typedef int __io_seek_fn (void *__cookie, _IO_off64_t *__pos, int __w);
 382
 383 /* Close COOKIE.  */
 384 typedef int __io_close_fn (void *__cookie);
 385
 386
 387 #ifdef _GNU_SOURCE
 388 /* User-visible names for the above.  */
 389 typedef __io_read_fn cookie_read_function_t;
 390 typedef __io_write_fn cookie_write_function_t;
 391 typedef __io_seek_fn cookie_seek_function_t;
 392 typedef __io_close_fn cookie_close_function_t;
 393
 394 /* The structure with the cookie function pointers.  */
 395 typedef struct
 396 {
 397   __io_read_fn *read;           /* Read bytes.  */
 398   __io_write_fn *write;         /* Write bytes.  */
 399   __io_seek_fn *seek;           /* Seek/tell file position.  */
 400   __io_close_fn *close;         /* Close file.  */
 401 } _IO_cookie_io_functions_t;
 402 typedef _IO_cookie_io_functions_t cookie_io_functions_t;
 403
 404 struct _IO_cookie_file;
 405
 406 /* Initialize one of those.  */
 407 extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
 408                              void *__cookie, _IO_cookie_io_functions_t __fns);
 409 #endif
 410
 411
 412 #ifdef __cplusplus
 413 extern "C" {
 414 #endif
 415
 416 extern int __underflow (_IO_FILE *);
 417 extern int __uflow (_IO_FILE *);
 418 extern int __overflow (_IO_FILE *, int);
 419 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 420 extern _IO_wint_t __wunderflow (_IO_FILE *);
 421 extern _IO_wint_t __wuflow (_IO_FILE *);
 422 extern _IO_wint_t __woverflow (_IO_FILE *, _IO_wint_t);
 423 #endif
 424
 425 #if  __GNUC__ >= 3
 426 # define _IO_BE(expr, res) __builtin_expect ((expr), res)
 427 #else
 428 # define _IO_BE(expr, res) (expr)
 429 #endif
 430
 431 #define _IO_getc_unlocked(_fp) \
 432        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 433         ? __uflow (_fp) : *(unsigned char *) (_fp)->_IO_read_ptr++)
 434 #define _IO_peekc_unlocked(_fp) \
 435        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 436           && __underflow (_fp) == EOF ? EOF \
 437         : *(unsigned char *) (_fp)->_IO_read_ptr)
 438 #define _IO_putc_unlocked(_ch, _fp) \
 439    (_IO_BE ((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end, 0) \
 440     ? __overflow (_fp, (unsigned char) (_ch)) \
 441     : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))
 442
 443 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 444 # define _IO_getwc_unlocked(_fp) \
 445   (_IO_BE ((_fp)->_wide_data->_IO_read_ptr >= (_fp)->_wide_data->_IO_read_end,\
 446            0) \
 447    ? __wuflow (_fp) : (_IO_wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
 448 # define _IO_putwc_unlocked(_wch, _fp) \
 449   (_IO_BE ((_fp)->_wide_data->_IO_write_ptr \
 450            >= (_fp)->_wide_data->_IO_write_end, 0) \
 451    ? __woverflow (_fp, _wch) \
 452    : (_IO_wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))
 453 #endif
 454
 455 #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 456 #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 457
 458 extern int _IO_getc (_IO_FILE *__fp);
 459 extern int _IO_putc (int __c, _IO_FILE *__fp);
 460 extern int _IO_feof (_IO_FILE *__fp) __THROW;
 461 extern int _IO_ferror (_IO_FILE *__fp) __THROW;
 462
 463 extern int _IO_peekc_locked (_IO_FILE *__fp);
 464
 465 /* This one is for Emacs. */
 466 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 467         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 468
 469 extern void _IO_flockfile (_IO_FILE *) __THROW;
 470 extern void _IO_funlockfile (_IO_FILE *) __THROW;
 471 extern int _IO_ftrylockfile (_IO_FILE *) __THROW;
 472
 473 #ifdef _IO_MTSAFE_IO
 474 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
 475 # define _IO_flockfile(_fp) \
 476   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_flockfile (_fp)
 477 # define _IO_funlockfile(_fp) \
 478   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_funlockfile (_fp)
 479 #else
 480 # define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 481 # define _IO_flockfile(_fp) /**/
 482 # define _IO_funlockfile(_fp) /**/
 483 # define _IO_ftrylockfile(_fp) /**/
 484 # define _IO_cleanup_region_start(_fct, _fp) /**/
 485 # define _IO_cleanup_region_end(_Doit) /**/
 486 #endif /* !_IO_MTSAFE_IO */
 487
 488 extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
 489                         _IO_va_list, int *__restrict);
 490 extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
 491                          _IO_va_list);
 492 extern _IO_ssize_t _IO_padn (_IO_FILE *, int, _IO_ssize_t);
 493 extern _IO_size_t _IO_sgetn (_IO_FILE *, void *, _IO_size_t);
 494
 495 extern _IO_off64_t _IO_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 496 extern _IO_off64_t _IO_seekpos (_IO_FILE *, _IO_off64_t, int);
 497
 498 extern void _IO_free_backup_area (_IO_FILE *) __THROW;
 499
 500 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 501 extern _IO_wint_t _IO_getwc (_IO_FILE *__fp);
 502 extern _IO_wint_t _IO_putwc (wchar_t __wc, _IO_FILE *__fp);
 503 extern int _IO_fwide (_IO_FILE *__fp, int __mode) __THROW;
 504 # if __GNUC__ >= 2
 505 /* While compiling glibc we have to handle compatibility with very old
 506    versions.  */
 507 #  if defined _LIBC && defined SHARED
 508 #   include <shlib-compat.h>
 509 #   if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
 510 #    define _IO_fwide_maybe_incompatible \
 511   (__builtin_expect (&_IO_stdin_used == NULL, 0))
 512 extern const int _IO_stdin_used;
 513 weak_extern (_IO_stdin_used);
 514 #   endif
 515 #  endif
 516 #  ifndef _IO_fwide_maybe_incompatible
 517 #   define _IO_fwide_maybe_incompatible (0)
 518 #  endif
 519 /* A special optimized version of the function above.  It optimizes the
 520    case of initializing an unoriented byte stream.  */
 521 #  define _IO_fwide(__fp, __mode) \
 522   ({ int __result = (__mode);                                                 \
 523      if (__result < 0 && ! _IO_fwide_maybe_incompatible)                      \
 524        {                                                                      \
 525          if ((__fp)->_mode == 0)                                              \
 526            /* We know that all we have to do is to set the flag.  */          \
 527            (__fp)->_mode = -1;                                                \
 528          __result = (__fp)->_mode;                                            \
 529        }                                                                      \
 530      else if (__builtin_constant_p (__mode) && (__mode) == 0)                 \
 531        __result = _IO_fwide_maybe_incompatible ? -1 : (__fp)->_mode;          \
 532      else                                                                     \
 533        __result = _IO_fwide (__fp, __result);                                 \
 534      __result; })
 535 # endif
 536
 537 extern int _IO_vfwscanf (_IO_FILE * __restrict, const wchar_t * __restrict,
 538                          _IO_va_list, int *__restrict);
 539 extern int _IO_vfwprintf (_IO_FILE *__restrict, const wchar_t *__restrict,
 540                           _IO_va_list);
 541 extern _IO_ssize_t _IO_wpadn (_IO_FILE *, wint_t, _IO_ssize_t);
 542 extern void _IO_free_wbackup_area (_IO_FILE *) __THROW;
 543 #endif
 544
 545 #ifdef __LDBL_COMPAT
 546 # include <bits/libio-ldbl.h>
 547 #endif
 548
 549 #ifdef __cplusplus
 550 }
 551 #endif
 552
 553 #endif /* _IO_STDIO_H */