libio/libio.h

   1 /* Copyright (C) 1991-1995, 1997-2001, 2002 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
 142 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 143 #define _IO_SKIPWS 01
 144 #define _IO_LEFT 02
 145 #define _IO_RIGHT 04
 146 #define _IO_INTERNAL 010
 147 #define _IO_DEC 020
 148 #define _IO_OCT 040
 149 #define _IO_HEX 0100
 150 #define _IO_SHOWBASE 0200
 151 #define _IO_SHOWPOINT 0400
 152 #define _IO_UPPERCASE 01000
 153 #define _IO_SHOWPOS 02000
 154 #define _IO_SCIENTIFIC 04000
 155 #define _IO_FIXED 010000
 156 #define _IO_UNITBUF 020000
 157 #define _IO_STDIO 040000
 158 #define _IO_DONT_CLOSE 0100000
 159 #define _IO_BOOLALPHA 0200000
 160
 161
 162 struct _IO_jump_t;  struct _IO_FILE;
 163
 164 /* Handle lock.  */
 165 #ifdef _IO_MTSAFE_IO
 166 # if defined __GLIBC__ && __GLIBC__ >= 2
 167 #  include <bits/stdio-lock.h>
 168 # else
 169 /*# include <comthread.h>*/
 170 # endif
 171 #else
 172 typedef void _IO_lock_t;
 173 #endif
 174
 175
 176 /* A streammarker remembers a position in a buffer. */
 177
 178 struct _IO_marker {
 179   struct _IO_marker *_next;
 180   struct _IO_FILE *_sbuf;
 181   /* If _pos >= 0
 182  it points to _buf->Gbase()+_pos. FIXME comment */
 183   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 184   int _pos;
 185 #if 0
 186     void set_streampos(streampos sp) { _spos = sp; }
 187     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 188   public:
 189     streammarker(streambuf *sb);
 190     ~streammarker();
 191     int saving() { return  _spos == -2; }
 192     int delta(streammarker&);
 193     int delta();
 194 #endif
 195 };
 196
 197 /* This is the structure from the libstdc++ codecvt class.  */
 198 enum __codecvt_result
 199 {
 200   __codecvt_ok,
 201   __codecvt_partial,
 202   __codecvt_error,
 203   __codecvt_noconv
 204 };
 205
 206 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 207 /* The order of the elements in the following struct must match the order
 208    of the virtual functions in the libstdc++ codecvt class.  */
 209 struct _IO_codecvt
 210 {
 211   void (*__codecvt_destr) (struct _IO_codecvt *);
 212   enum __codecvt_result (*__codecvt_do_out) (struct _IO_codecvt *,
 213                                              __mbstate_t *,
 214                                              const wchar_t *,
 215                                              const wchar_t *,
 216                                              const wchar_t **, char *,
 217                                              char *, char **);
 218   enum __codecvt_result (*__codecvt_do_unshift) (struct _IO_codecvt *,
 219                                                  __mbstate_t *, char *,
 220                                                  char *, char **);
 221   enum __codecvt_result (*__codecvt_do_in) (struct _IO_codecvt *,
 222                                             __mbstate_t *,
 223                                             const char *, const char *,
 224                                             const char **, wchar_t *,
 225                                             wchar_t *, wchar_t **);
 226   int (*__codecvt_do_encoding) (struct _IO_codecvt *);
 227   int (*__codecvt_do_always_noconv) (struct _IO_codecvt *);
 228   int (*__codecvt_do_length) (struct _IO_codecvt *, __mbstate_t *,
 229                               const char *, const char *, _IO_size_t);
 230   int (*__codecvt_do_max_length) (struct _IO_codecvt *);
 231
 232   _IO_iconv_t __cd_in;
 233   _IO_iconv_t __cd_out;
 234 };
 235
 236 /* Extra data for wide character streams.  */
 237 struct _IO_wide_data
 238 {
 239   wchar_t *_IO_read_ptr;        /* Current read pointer */
 240   wchar_t *_IO_read_end;        /* End of get area. */
 241   wchar_t *_IO_read_base;       /* Start of putback+get area. */
 242   wchar_t *_IO_write_base;      /* Start of put area. */
 243   wchar_t *_IO_write_ptr;       /* Current put pointer. */
 244   wchar_t *_IO_write_end;       /* End of put area. */
 245   wchar_t *_IO_buf_base;        /* Start of reserve area. */
 246   wchar_t *_IO_buf_end;         /* End of reserve area. */
 247   /* The following fields are used to support backing up and undo. */
 248   wchar_t *_IO_save_base;       /* Pointer to start of non-current get area. */
 249   wchar_t *_IO_backup_base;     /* Pointer to first valid character of
 250                                    backup area */
 251   wchar_t *_IO_save_end;        /* Pointer to end of non-current get area. */
 252
 253   __mbstate_t _IO_state;
 254   __mbstate_t _IO_last_state;
 255   struct _IO_codecvt _codecvt;
 256
 257   wchar_t _shortbuf[1];
 258
 259   struct _IO_jump_t *_wide_vtable;
 260 };
 261 #endif
 262
 263 struct _IO_FILE {
 264   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 265 #define _IO_file_flags _flags
 266
 267   /* The following pointers correspond to the C++ streambuf protocol. */
 268   /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
 269   char* _IO_read_ptr;   /* Current read pointer */
 270   char* _IO_read_end;   /* End of get area. */
 271   char* _IO_read_base;  /* Start of putback+get area. */
 272   char* _IO_write_base; /* Start of put area. */
 273   char* _IO_write_ptr;  /* Current put pointer. */
 274   char* _IO_write_end;  /* End of put area. */
 275   char* _IO_buf_base;   /* Start of reserve area. */
 276   char* _IO_buf_end;    /* End of reserve area. */
 277   /* The following fields are used to support backing up and undo. */
 278   char *_IO_save_base; /* Pointer to start of non-current get area. */
 279   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 280   char *_IO_save_end; /* Pointer to end of non-current get area. */
 281
 282   struct _IO_marker *_markers;
 283
 284   struct _IO_FILE *_chain;
 285
 286   int _fileno;
 287 #if 0
 288   int _blksize;
 289 #else
 290   int _flags2;
 291 #endif
 292   _IO_off_t _old_offset; /* This used to be _offset but it's too small.  */
 293
 294 #define __HAVE_COLUMN /* temporary */
 295   /* 1+column number of pbase(); 0 is unknown. */
 296   unsigned short _cur_column;
 297   signed char _vtable_offset;
 298   char _shortbuf[1];
 299
 300   /*  char* _save_gptr;  char* _save_egptr; */
 301
 302   _IO_lock_t *_lock;
 303 #ifdef _IO_USE_OLD_IO_FILE
 304 };
 305
 306 struct _IO_FILE_complete
 307 {
 308   struct _IO_FILE _file;
 309 #endif
 310 #if defined _G_IO_IO_FILE_VERSION && _G_IO_IO_FILE_VERSION == 0x20001
 311   _IO_off64_t _offset;
 312 # if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 313   /* Wide character stream stuff.  */
 314   struct _IO_codecvt *_codecvt;
 315   struct _IO_wide_data *_wide_data;
 316 # else
 317   void *__pad1;
 318   void *__pad2;
 319 # endif
 320   int _mode;
 321   /* Make sure we don't get into trouble again.  */
 322   char _unused2[15 * sizeof (int) - 2 * sizeof (void *)];
 323 #endif
 324 };
 325
 326 #ifndef __cplusplus
 327 typedef struct _IO_FILE _IO_FILE;
 328 #endif
 329
 330 struct _IO_FILE_plus;
 331
 332 extern struct _IO_FILE_plus _IO_2_1_stdin_;
 333 extern struct _IO_FILE_plus _IO_2_1_stdout_;
 334 extern struct _IO_FILE_plus _IO_2_1_stderr_;
 335 #ifndef _LIBC
 336 #define _IO_stdin ((_IO_FILE*)(&_IO_2_1_stdin_))
 337 #define _IO_stdout ((_IO_FILE*)(&_IO_2_1_stdout_))
 338 #define _IO_stderr ((_IO_FILE*)(&_IO_2_1_stderr_))
 339 #else
 340 extern _IO_FILE *_IO_stdin attribute_hidden;
 341 extern _IO_FILE *_IO_stdout attribute_hidden;
 342 extern _IO_FILE *_IO_stderr attribute_hidden;
 343 #endif
 344
 345
 346 /* Functions to do I/O and file management for a stream.  */
 347
 348 /* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
 349    Return number of bytes read.  */
 350 typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);
 351
 352 /* Write N bytes pointed to by BUF to COOKIE.  Write all N bytes
 353    unless there is an error.  Return number of bytes written, or -1 if
 354    there is an error without writing anything.  If the file has been
 355    opened for append (__mode.__append set), then set the file pointer
 356    to the end of the file and then do the write; if not, just write at
 357    the current file pointer.  */
 358 typedef __ssize_t __io_write_fn (void *__cookie, __const char *__buf,
 359                                  size_t __n);
 360
 361 /* Move COOKIE's file position to *POS bytes from the
 362    beginning of the file (if W is SEEK_SET),
 363    the current position (if W is SEEK_CUR),
 364    or the end of the file (if W is SEEK_END).
 365    Set *POS to the new file position.
 366    Returns zero if successful, nonzero if not.  */
 367 typedef int __io_seek_fn (void *__cookie, _IO_off64_t *__pos, int __w);
 368
 369 /* Close COOKIE.  */
 370 typedef int __io_close_fn (void *__cookie);
 371
 372
 373 #ifdef _GNU_SOURCE
 374 /* User-visible names for the above.  */
 375 typedef __io_read_fn cookie_read_function_t;
 376 typedef __io_write_fn cookie_write_function_t;
 377 typedef __io_seek_fn cookie_seek_function_t;
 378 typedef __io_close_fn cookie_close_function_t;
 379
 380 /* The structure with the cookie function pointers.  */
 381 typedef struct
 382 {
 383   __io_read_fn *read;           /* Read bytes.  */
 384   __io_write_fn *write;         /* Write bytes.  */
 385   __io_seek_fn *seek;           /* Seek/tell file position.  */
 386   __io_close_fn *close;         /* Close file.  */
 387 } _IO_cookie_io_functions_t;
 388 typedef _IO_cookie_io_functions_t cookie_io_functions_t;
 389
 390 struct _IO_cookie_file;
 391
 392 /* Initialize one of those.  */
 393 extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
 394                              void *__cookie, _IO_cookie_io_functions_t __fns);
 395 #endif
 396
 397
 398 #ifdef __cplusplus
 399 extern "C" {
 400 #endif
 401
 402 extern int __underflow (_IO_FILE *) __THROW;
 403 extern int __uflow (_IO_FILE *) __THROW;
 404 extern int __overflow (_IO_FILE *, int) __THROW;
 405 extern _IO_wint_t __wunderflow (_IO_FILE *) __THROW;
 406 extern _IO_wint_t __wuflow (_IO_FILE *) __THROW;
 407 extern _IO_wint_t __woverflow (_IO_FILE *, _IO_wint_t) __THROW;
 408
 409 #define _IO_getc_unlocked(_fp) \
 410        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end ? __uflow (_fp) \
 411         : *(unsigned char *) (_fp)->_IO_read_ptr++)
 412 #define _IO_peekc_unlocked(_fp) \
 413        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end \
 414           && __underflow (_fp) == EOF ? EOF \
 415         : *(unsigned char *) (_fp)->_IO_read_ptr)
 416 #define _IO_putc_unlocked(_ch, _fp) \
 417    (((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end) \
 418     ? __overflow (_fp, (unsigned char) (_ch)) \
 419     : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))
 420
 421 #define _IO_getwc_unlocked(_fp) \
 422   ((_fp)->_wide_data->_IO_read_ptr >= (_fp)->_wide_data->_IO_read_end \
 423    ? __wuflow (_fp) : (_IO_wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
 424 #define _IO_putwc_unlocked(_wch, _fp) \
 425   ((_fp)->_wide_data->_IO_write_ptr >= (_fp)->_wide_data->_IO_write_end \
 426    ? __woverflow (_fp, _wch) \
 427    : (_IO_wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))
 428
 429 #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 430 #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 431
 432 extern int _IO_getc (_IO_FILE *__fp) __THROW;
 433 extern int _IO_putc (int __c, _IO_FILE *__fp) __THROW;
 434 extern int _IO_feof (_IO_FILE *__fp) __THROW;
 435 extern int _IO_ferror (_IO_FILE *__fp) __THROW;
 436
 437 extern int _IO_peekc_locked (_IO_FILE *__fp) __THROW;
 438
 439 /* This one is for Emacs. */
 440 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 441         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 442
 443 extern void _IO_flockfile (_IO_FILE *) __THROW;
 444 extern void _IO_funlockfile (_IO_FILE *) __THROW;
 445 extern int _IO_ftrylockfile (_IO_FILE *) __THROW;
 446
 447 #ifdef _IO_MTSAFE_IO
 448 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
 449 # define _IO_flockfile(_fp) \
 450   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_flockfile (_fp)
 451 # define _IO_funlockfile(_fp) \
 452   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_funlockfile (_fp)
 453 #else
 454 # define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 455 # define _IO_flockfile(_fp) /**/
 456 # define _IO_funlockfile(_fp) /**/
 457 # define _IO_ftrylockfile(_fp) /**/
 458 # define _IO_cleanup_region_start(_fct, _fp) /**/
 459 # define _IO_cleanup_region_end(_Doit) /**/
 460 #endif /* !_IO_MTSAFE_IO */
 461
 462 extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
 463                         _IO_va_list, int *__restrict) __THROW;
 464 extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
 465                          _IO_va_list) __THROW;
 466 extern _IO_ssize_t _IO_padn (_IO_FILE *, int, _IO_ssize_t) __THROW;
 467 extern _IO_size_t _IO_sgetn (_IO_FILE *, void *, _IO_size_t) __THROW;
 468
 469 extern _IO_off64_t _IO_seekoff (_IO_FILE *, _IO_off64_t, int, int) __THROW;
 470 extern _IO_off64_t _IO_seekpos (_IO_FILE *, _IO_off64_t, int) __THROW;
 471
 472 extern void _IO_free_backup_area (_IO_FILE *) __THROW;
 473
 474 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 475 extern _IO_wint_t _IO_getwc (_IO_FILE *__fp) __THROW;
 476 extern _IO_wint_t _IO_putwc (wchar_t __wc, _IO_FILE *__fp) __THROW;
 477 extern int _IO_fwide (_IO_FILE *__fp, int __mode) __THROW;
 478 # if __GNUC__ >= 2
 479 /* While compiling glibc we have to handle compatibility with very old
 480    versions.  */
 481 #  if defined _LIBC && defined SHARED
 482 #   include <shlib-compat.h>
 483 #   if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
 484 #    define _IO_fwide_maybe_incompatible \
 485   (__builtin_expect (&_IO_stdin_used == NULL, 0))
 486 extern const int _IO_stdin_used;
 487 weak_extern (_IO_stdin_used);
 488 #   endif
 489 #  endif
 490 #  ifndef _IO_fwide_maybe_incompatible
 491 #   define _IO_fwide_maybe_incompatible (0)
 492 #  endif
 493 /* A special optimized version of the function above.  It optimizes the
 494    case of initializing an unoriented byte stream.  */
 495 #  define _IO_fwide(__fp, __mode) \
 496   ({ int __result = (__mode);                                                 \
 497      if (__result < 0 && ! _IO_fwide_maybe_incompatible)                      \
 498        {                                                                      \
 499          if ((__fp)->_mode == 0)                                              \
 500            /* We know that all we have to do is to set the flag.  */          \
 501            (__fp)->_mode = -1;                                                \
 502          __result = (__fp)->_mode;                                            \
 503        }                                                                      \
 504      else if (__builtin_constant_p (__mode) && (__mode) == 0)                 \
 505        __result = (__fp)->_mode;                                              \
 506      else                                                                     \
 507        __result = _IO_fwide (__fp, __result);                                 \
 508      __result; })
 509 # endif
 510
 511 extern int _IO_vfwscanf (_IO_FILE * __restrict, const wchar_t * __restrict,
 512                          _IO_va_list, int *__restrict) __THROW;
 513 extern int _IO_vfwprintf (_IO_FILE *__restrict, const wchar_t *__restrict,
 514                           _IO_va_list) __THROW;
 515 extern _IO_ssize_t _IO_wpadn (_IO_FILE *, wint_t, _IO_ssize_t) __THROW;
 516 extern void _IO_free_wbackup_area (_IO_FILE *) __THROW;
 517 #endif
 518
 519 #ifdef __cplusplus
 520 }
 521 #endif
 522
 523 #endif /* _IO_STDIO_H */