libio/libio.h

   1 /* Copyright (C) 1991-2017 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, see
  17    <http://www.gnu.org/licenses/>.
  18
  19    As a special exception, if you link the code in this file with
  20    files compiled with a GNU compiler to produce an executable,
  21    that does not cause the resulting executable to be covered by
  22    the GNU Lesser General Public License.  This exception does not
  23    however invalidate any other reasons why the executable file
  24    might be covered by the GNU Lesser General Public License.
  25    This exception applies to code released by its copyright holders
  26    in files containing the exception.  */
  27
  28 #ifndef _IO_STDIO_H
  29 #define _IO_STDIO_H
  30
  31 #include <_G_config.h>
  32 /* ALL of these should be defined in _G_config.h */
  33 #define _IO_fpos_t _G_fpos_t
  34 #define _IO_fpos64_t _G_fpos64_t
  35 #define _IO_size_t size_t
  36 #define _IO_ssize_t __ssize_t
  37 #define _IO_off_t __off_t
  38 #define _IO_off64_t __off64_t
  39 #define _IO_pid_t __pid_t
  40 #define _IO_uid_t __uid_t
  41 #define _IO_iconv_t _G_iconv_t
  42 #define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE
  43 #define _IO_BUFSIZ _G_BUFSIZ
  44 #define _IO_va_list _G_va_list
  45 #define _IO_wint_t wint_t
  46
  47 /* This define avoids name pollution if we're using GNU stdarg.h */
  48 #define __need___va_list
  49 #include <stdarg.h>
  50 #ifdef __GNUC_VA_LIST
  51 # undef _IO_va_list
  52 # define _IO_va_list __gnuc_va_list
  53 #endif /* __GNUC_VA_LIST */
  54
  55 #ifndef __P
  56 # include <sys/cdefs.h>
  57 #endif /*!__P*/
  58
  59 #define _IO_UNIFIED_JUMPTABLES 1
  60
  61 #ifndef EOF
  62 # define EOF (-1)
  63 #endif
  64 #ifndef NULL
  65 # if defined __GNUG__ && \
  66     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
  67 #  define NULL (__null)
  68 # else
  69 #  if !defined(__cplusplus)
  70 #   define NULL ((void*)0)
  71 #  else
  72 #   define NULL (0)
  73 #  endif
  74 # endif
  75 #endif
  76
  77 #define _IOS_INPUT      1
  78 #define _IOS_OUTPUT     2
  79 #define _IOS_ATEND      4
  80 #define _IOS_APPEND     8
  81 #define _IOS_TRUNC      16
  82 #define _IOS_NOCREATE   32
  83 #define _IOS_NOREPLACE  64
  84 #define _IOS_BIN        128
  85
  86 /* Magic numbers and bits for the _flags field.
  87    The magic numbers use the high-order bits of _flags;
  88    the remaining bits are available for variable flags.
  89    Note: The magic numbers must all be negative if stdio
  90    emulation is desired. */
  91
  92 #define _IO_MAGIC 0xFBAD0000 /* Magic number */
  93 #define _OLD_STDIO_MAGIC 0xFABC0000 /* Emulate old stdio. */
  94 #define _IO_MAGIC_MASK 0xFFFF0000
  95 #define _IO_USER_BUF 1 /* User owns buffer; don't delete it on close. */
  96 #define _IO_UNBUFFERED 2
  97 #define _IO_NO_READS 4 /* Reading not allowed */
  98 #define _IO_NO_WRITES 8 /* Writing not allowd */
  99 #define _IO_EOF_SEEN 0x10
 100 #define _IO_ERR_SEEN 0x20
 101 #define _IO_DELETE_DONT_CLOSE 0x40 /* Don't call close(_fileno) on cleanup. */
 102 #define _IO_LINKED 0x80 /* Set if linked (using _chain) to streambuf::_list_all.*/
 103 #define _IO_IN_BACKUP 0x100
 104 #define _IO_LINE_BUF 0x200
 105 #define _IO_TIED_PUT_GET 0x400 /* Set if put and get pointer logicly tied. */
 106 #define _IO_CURRENTLY_PUTTING 0x800
 107 #define _IO_IS_APPENDING 0x1000
 108 #define _IO_IS_FILEBUF 0x2000
 109 #define _IO_BAD_SEEN 0x4000
 110 #define _IO_USER_LOCK 0x8000
 111
 112 #define _IO_FLAGS2_MMAP 1
 113 #define _IO_FLAGS2_NOTCANCEL 2
 114 #ifdef _LIBC
 115 # define _IO_FLAGS2_FORTIFY 4
 116 #endif
 117 #define _IO_FLAGS2_USER_WBUF 8
 118 #ifdef _LIBC
 119 # define _IO_FLAGS2_SCANF_STD 16
 120 # define _IO_FLAGS2_NOCLOSE 32
 121 # define _IO_FLAGS2_CLOEXEC 64
 122 # define _IO_FLAGS2_NEED_LOCK 128
 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 /* During the build of glibc itself, _IO_lock_t will already have been
 148    defined by internal headers.  */
 149 #ifndef _IO_lock_t_defined
 150 typedef void _IO_lock_t;
 151 #endif
 152
 153
 154 /* A streammarker remembers a position in a buffer. */
 155
 156 struct _IO_marker {
 157   struct _IO_marker *_next;
 158   struct _IO_FILE *_sbuf;
 159   /* If _pos >= 0
 160  it points to _buf->Gbase()+_pos. FIXME comment */
 161   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 162   int _pos;
 163 #if 0
 164     void set_streampos(streampos sp) { _spos = sp; }
 165     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 166   public:
 167     streammarker(streambuf *sb);
 168     ~streammarker();
 169     int saving() { return  _spos == -2; }
 170     int delta(streammarker&);
 171     int delta();
 172 #endif
 173 };
 174
 175 /* This is the structure from the libstdc++ codecvt class.  */
 176 enum __codecvt_result
 177 {
 178   __codecvt_ok,
 179   __codecvt_partial,
 180   __codecvt_error,
 181   __codecvt_noconv
 182 };
 183
 184 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 185 /* The order of the elements in the following struct must match the order
 186    of the virtual functions in the libstdc++ codecvt class.  */
 187 struct _IO_codecvt
 188 {
 189   void (*__codecvt_destr) (struct _IO_codecvt *);
 190   enum __codecvt_result (*__codecvt_do_out) (struct _IO_codecvt *,
 191                                              __mbstate_t *,
 192                                              const wchar_t *,
 193                                              const wchar_t *,
 194                                              const wchar_t **, char *,
 195                                              char *, char **);
 196   enum __codecvt_result (*__codecvt_do_unshift) (struct _IO_codecvt *,
 197                                                  __mbstate_t *, char *,
 198                                                  char *, char **);
 199   enum __codecvt_result (*__codecvt_do_in) (struct _IO_codecvt *,
 200                                             __mbstate_t *,
 201                                             const char *, const char *,
 202                                             const char **, wchar_t *,
 203                                             wchar_t *, wchar_t **);
 204   int (*__codecvt_do_encoding) (struct _IO_codecvt *);
 205   int (*__codecvt_do_always_noconv) (struct _IO_codecvt *);
 206   int (*__codecvt_do_length) (struct _IO_codecvt *, __mbstate_t *,
 207                               const char *, const char *, _IO_size_t);
 208   int (*__codecvt_do_max_length) (struct _IO_codecvt *);
 209
 210   _IO_iconv_t __cd_in;
 211   _IO_iconv_t __cd_out;
 212 };
 213
 214 /* Extra data for wide character streams.  */
 215 struct _IO_wide_data
 216 {
 217   wchar_t *_IO_read_ptr;        /* Current read pointer */
 218   wchar_t *_IO_read_end;        /* End of get area. */
 219   wchar_t *_IO_read_base;       /* Start of putback+get area. */
 220   wchar_t *_IO_write_base;      /* Start of put area. */
 221   wchar_t *_IO_write_ptr;       /* Current put pointer. */
 222   wchar_t *_IO_write_end;       /* End of put area. */
 223   wchar_t *_IO_buf_base;        /* Start of reserve area. */
 224   wchar_t *_IO_buf_end;         /* End of reserve area. */
 225   /* The following fields are used to support backing up and undo. */
 226   wchar_t *_IO_save_base;       /* Pointer to start of non-current get area. */
 227   wchar_t *_IO_backup_base;     /* Pointer to first valid character of
 228                                    backup area */
 229   wchar_t *_IO_save_end;        /* Pointer to end of non-current get area. */
 230
 231   __mbstate_t _IO_state;
 232   __mbstate_t _IO_last_state;
 233   struct _IO_codecvt _codecvt;
 234
 235   wchar_t _shortbuf[1];
 236
 237   const struct _IO_jump_t *_wide_vtable;
 238 };
 239 #endif
 240
 241 struct _IO_FILE {
 242   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 243 #define _IO_file_flags _flags
 244
 245   /* The following pointers correspond to the C++ streambuf protocol. */
 246   /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
 247   char* _IO_read_ptr;   /* Current read pointer */
 248   char* _IO_read_end;   /* End of get area. */
 249   char* _IO_read_base;  /* Start of putback+get area. */
 250   char* _IO_write_base; /* Start of put area. */
 251   char* _IO_write_ptr;  /* Current put pointer. */
 252   char* _IO_write_end;  /* End of put area. */
 253   char* _IO_buf_base;   /* Start of reserve area. */
 254   char* _IO_buf_end;    /* End of reserve area. */
 255   /* The following fields are used to support backing up and undo. */
 256   char *_IO_save_base; /* Pointer to start of non-current get area. */
 257   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 258   char *_IO_save_end; /* Pointer to end of non-current get area. */
 259
 260   struct _IO_marker *_markers;
 261
 262   struct _IO_FILE *_chain;
 263
 264   int _fileno;
 265 #if 0
 266   int _blksize;
 267 #else
 268   int _flags2;
 269 #endif
 270   _IO_off_t _old_offset; /* This used to be _offset but it's too small.  */
 271
 272 #define __HAVE_COLUMN /* temporary */
 273   /* 1+column number of pbase(); 0 is unknown. */
 274   unsigned short _cur_column;
 275   signed char _vtable_offset;
 276   char _shortbuf[1];
 277
 278   /*  char* _save_gptr;  char* _save_egptr; */
 279
 280   _IO_lock_t *_lock;
 281 #ifdef _IO_USE_OLD_IO_FILE
 282 };
 283
 284 struct _IO_FILE_complete
 285 {
 286   struct _IO_FILE _file;
 287 #endif
 288 #if defined _G_IO_IO_FILE_VERSION && _G_IO_IO_FILE_VERSION == 0x20001
 289   _IO_off64_t _offset;
 290 # if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 291   /* Wide character stream stuff.  */
 292   struct _IO_codecvt *_codecvt;
 293   struct _IO_wide_data *_wide_data;
 294   struct _IO_FILE *_freeres_list;
 295   void *_freeres_buf;
 296 # else
 297   void *__pad1;
 298   void *__pad2;
 299   void *__pad3;
 300   void *__pad4;
 301 # endif
 302   size_t __pad5;
 303   int _mode;
 304   /* Make sure we don't get into trouble again.  */
 305   char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
 306 #endif
 307 };
 308
 309 #ifndef __cplusplus
 310 typedef struct _IO_FILE _IO_FILE;
 311 #endif
 312
 313 struct _IO_FILE_plus;
 314
 315 extern struct _IO_FILE_plus _IO_2_1_stdin_;
 316 extern struct _IO_FILE_plus _IO_2_1_stdout_;
 317 extern struct _IO_FILE_plus _IO_2_1_stderr_;
 318 #ifndef _LIBC
 319 #define _IO_stdin ((_IO_FILE*)(&_IO_2_1_stdin_))
 320 #define _IO_stdout ((_IO_FILE*)(&_IO_2_1_stdout_))
 321 #define _IO_stderr ((_IO_FILE*)(&_IO_2_1_stderr_))
 322 #else
 323 extern _IO_FILE *_IO_stdin attribute_hidden;
 324 extern _IO_FILE *_IO_stdout attribute_hidden;
 325 extern _IO_FILE *_IO_stderr attribute_hidden;
 326 #endif
 327
 328
 329 /* Functions to do I/O and file management for a stream.  */
 330
 331 /* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
 332    Return number of bytes read.  */
 333 typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);
 334
 335 /* Write N bytes pointed to by BUF to COOKIE.  Write all N bytes
 336    unless there is an error.  Return number of bytes written.  If
 337    there is an error, return 0 and do not write anything.  If the file
 338    has been opened for append (__mode.__append set), then set the file
 339    pointer to the end of the file and then do the write; if not, just
 340    write at the current file pointer.  */
 341 typedef __ssize_t __io_write_fn (void *__cookie, const char *__buf,
 342                                  size_t __n);
 343
 344 /* Move COOKIE's file position to *POS bytes from the
 345    beginning of the file (if W is SEEK_SET),
 346    the current position (if W is SEEK_CUR),
 347    or the end of the file (if W is SEEK_END).
 348    Set *POS to the new file position.
 349    Returns zero if successful, nonzero if not.  */
 350 typedef int __io_seek_fn (void *__cookie, _IO_off64_t *__pos, int __w);
 351
 352 /* Close COOKIE.  */
 353 typedef int __io_close_fn (void *__cookie);
 354
 355
 356 #ifdef __USE_GNU
 357 /* User-visible names for the above.  */
 358 typedef __io_read_fn cookie_read_function_t;
 359 typedef __io_write_fn cookie_write_function_t;
 360 typedef __io_seek_fn cookie_seek_function_t;
 361 typedef __io_close_fn cookie_close_function_t;
 362
 363 /* The structure with the cookie function pointers.  */
 364 typedef struct
 365 {
 366   __io_read_fn *read;           /* Read bytes.  */
 367   __io_write_fn *write;         /* Write bytes.  */
 368   __io_seek_fn *seek;           /* Seek/tell file position.  */
 369   __io_close_fn *close;         /* Close file.  */
 370 } _IO_cookie_io_functions_t;
 371 typedef _IO_cookie_io_functions_t cookie_io_functions_t;
 372
 373 struct _IO_cookie_file;
 374
 375 /* Initialize one of those.  */
 376 extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
 377                              void *__cookie, _IO_cookie_io_functions_t __fns);
 378 #endif
 379
 380
 381 #ifdef __cplusplus
 382 extern "C" {
 383 #endif
 384
 385 extern int __underflow (_IO_FILE *);
 386 extern int __uflow (_IO_FILE *);
 387 extern int __overflow (_IO_FILE *, int);
 388 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 389 extern _IO_wint_t __wunderflow (_IO_FILE *);
 390 extern _IO_wint_t __wuflow (_IO_FILE *);
 391 extern _IO_wint_t __woverflow (_IO_FILE *, _IO_wint_t);
 392 #endif
 393
 394 #if  __GNUC__ >= 3
 395 # define _IO_BE(expr, res) __builtin_expect ((expr), res)
 396 #else
 397 # define _IO_BE(expr, res) (expr)
 398 #endif
 399
 400 #define _IO_getc_unlocked(_fp) \
 401        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 402         ? __uflow (_fp) : *(unsigned char *) (_fp)->_IO_read_ptr++)
 403 #define _IO_peekc_unlocked(_fp) \
 404        (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
 405           && __underflow (_fp) == EOF ? EOF \
 406         : *(unsigned char *) (_fp)->_IO_read_ptr)
 407 #define _IO_putc_unlocked(_ch, _fp) \
 408    (_IO_BE ((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end, 0) \
 409     ? __overflow (_fp, (unsigned char) (_ch)) \
 410     : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))
 411
 412 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 413 # define _IO_getwc_unlocked(_fp) \
 414   (_IO_BE ((_fp)->_wide_data == NULL                                    \
 415            || ((_fp)->_wide_data->_IO_read_ptr                          \
 416                >= (_fp)->_wide_data->_IO_read_end), 0)                  \
 417    ? __wuflow (_fp) : (_IO_wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
 418 # define _IO_putwc_unlocked(_wch, _fp) \
 419   (_IO_BE ((_fp)->_wide_data == NULL                                    \
 420            || ((_fp)->_wide_data->_IO_write_ptr                         \
 421                >= (_fp)->_wide_data->_IO_write_end), 0)                 \
 422    ? __woverflow (_fp, _wch)                                            \
 423    : (_IO_wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))
 424 #endif
 425
 426 #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 427 #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 428
 429 extern int _IO_getc (_IO_FILE *__fp);
 430 extern int _IO_putc (int __c, _IO_FILE *__fp);
 431 extern int _IO_feof (_IO_FILE *__fp) __THROW;
 432 extern int _IO_ferror (_IO_FILE *__fp) __THROW;
 433
 434 extern int _IO_peekc_locked (_IO_FILE *__fp);
 435
 436 /* This one is for Emacs. */
 437 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 438         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 439
 440 extern void _IO_flockfile (_IO_FILE *) __THROW;
 441 extern void _IO_funlockfile (_IO_FILE *) __THROW;
 442 extern int _IO_ftrylockfile (_IO_FILE *) __THROW;
 443
 444 #define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 445 #define _IO_flockfile(_fp) /**/
 446 #define _IO_funlockfile(_fp) /**/
 447 #define _IO_ftrylockfile(_fp) /**/
 448 #ifndef _IO_cleanup_region_start
 449 #define _IO_cleanup_region_start(_fct, _fp) /**/
 450 #endif
 451 #ifndef _IO_cleanup_region_end
 452 #define _IO_cleanup_region_end(_Doit) /**/
 453 #endif
 454
 455 #define _IO_need_lock(_fp) \
 456   (((_fp)->_flags2 & _IO_FLAGS2_NEED_LOCK) != 0)
 457
 458 extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
 459                         _IO_va_list, int *__restrict);
 460 extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
 461                          _IO_va_list);
 462 extern _IO_ssize_t _IO_padn (_IO_FILE *, int, _IO_ssize_t);
 463 extern _IO_size_t _IO_sgetn (_IO_FILE *, void *, _IO_size_t);
 464
 465 extern _IO_off64_t _IO_seekoff (_IO_FILE *, _IO_off64_t, int, int);
 466 extern _IO_off64_t _IO_seekpos (_IO_FILE *, _IO_off64_t, int);
 467
 468 extern void _IO_free_backup_area (_IO_FILE *) __THROW;
 469
 470 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
 471 extern _IO_wint_t _IO_getwc (_IO_FILE *__fp);
 472 extern _IO_wint_t _IO_putwc (wchar_t __wc, _IO_FILE *__fp);
 473 extern int _IO_fwide (_IO_FILE *__fp, int __mode) __THROW;
 474 # if __GNUC__ >= 2
 475 /* While compiling glibc we have to handle compatibility with very old
 476    versions.  */
 477 #  if defined _LIBC && defined SHARED
 478 #   include <shlib-compat.h>
 479 #   if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
 480 #    define _IO_fwide_maybe_incompatible \
 481   (__builtin_expect (&_IO_stdin_used == NULL, 0))
 482 extern const int _IO_stdin_used;
 483 weak_extern (_IO_stdin_used);
 484 #   endif
 485 #  endif
 486 #  ifndef _IO_fwide_maybe_incompatible
 487 #   define _IO_fwide_maybe_incompatible (0)
 488 #  endif
 489 /* A special optimized version of the function above.  It optimizes the
 490    case of initializing an unoriented byte stream.  */
 491 #  define _IO_fwide(__fp, __mode) \
 492   ({ int __result = (__mode);                                                 \
 493      if (__result < 0 && ! _IO_fwide_maybe_incompatible)                      \
 494        {                                                                      \
 495          if ((__fp)->_mode == 0)                                              \
 496            /* We know that all we have to do is to set the flag.  */          \
 497            (__fp)->_mode = -1;                                                \
 498          __result = (__fp)->_mode;                                            \
 499        }                                                                      \
 500      else if (__builtin_constant_p (__mode) && (__mode) == 0)                 \
 501        __result = _IO_fwide_maybe_incompatible ? -1 : (__fp)->_mode;          \
 502      else                                                                     \
 503        __result = _IO_fwide (__fp, __result);                                 \
 504      __result; })
 505 # endif
 506
 507 extern int _IO_vfwscanf (_IO_FILE * __restrict, const wchar_t * __restrict,
 508                          _IO_va_list, int *__restrict);
 509 extern int _IO_vfwprintf (_IO_FILE *__restrict, const wchar_t *__restrict,
 510                           _IO_va_list);
 511 extern _IO_ssize_t _IO_wpadn (_IO_FILE *, wint_t, _IO_ssize_t);
 512 extern void _IO_free_wbackup_area (_IO_FILE *) __THROW;
 513 #endif
 514
 515 #ifdef __LDBL_COMPAT
 516 # include <bits/libio-ldbl.h>
 517 #endif
 518
 519 #ifdef __cplusplus
 520 }
 521 #endif
 522
 523 #endif /* _IO_STDIO_H */