libio/libio.h

   1 /* Copyright (C) 1991, 92, 93, 94, 95, 97 Free Software Foundation, Inc.
   2    This file is part of the GNU IO Library.
   3    Written by Per Bothner <bothner@cygnus.com>.
   4
   5    This library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU General Public License as
   7    published by the Free Software Foundation; either version 2, or (at
   8    your option) any later version.
   9
  10    This library is distributed in the hope that it will be useful, but
  11    WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this library; see the file COPYING.  If not, write to
  17    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  18    MA 02111-1307, USA.
  19
  20    As a special exception, if you link this library with files
  21    compiled with a GNU compiler to produce an executable, this does
  22    not cause the resulting executable to be covered by the GNU General
  23    Public License.  This exception does not however invalidate any
  24    other reasons why the executable file might be covered by the GNU
  25    General Public License.  */
  26
  27 #ifndef _IO_STDIO_H
  28 #define _IO_STDIO_H
  29
  30 #include <_G_config.h>
  31 #define _IO_pos_t _G_fpos_t /* obsolete */
  32 #define _IO_fpos_t _G_fpos_t
  33 #define _IO_size_t _G_size_t
  34 #define _IO_ssize_t _G_ssize_t
  35 #define _IO_off_t _G_off_t
  36 #define _IO_pid_t _G_pid_t
  37 #define _IO_uid_t _G_uid_t
  38 #define _IO_HAVE_SYS_WAIT _G_HAVE_SYS_WAIT
  39 #define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE
  40 #define _IO_BUFSIZ _G_BUFSIZ
  41 #define _IO_va_list _G_va_list
  42
  43 #ifdef _G_NEED_STDARG_H
  44 /* This define avoids name pollution if we're using GNU stdarg.h */
  45 # define __need___va_list
  46 # include <stdarg.h>
  47 # ifdef __GNUC_VA_LIST
  48 #  undef _IO_va_list
  49 #  define _IO_va_list __gnuc_va_list
  50 # endif /* __GNUC_VA_LIST */
  51 #endif
  52
  53 #ifndef __P
  54 # if _G_HAVE_SYS_CDEFS
  55 #  include <sys/cdefs.h>
  56 # else
  57 #  ifdef __STDC__
  58 #   define __P(protos) protos
  59 #  else
  60 #   define __P(protos) ()
  61 #  endif
  62 # endif
  63 #endif /*!__P*/
  64
  65 /* For backward compatibility */
  66 #ifndef _PARAMS
  67 # define _PARAMS(protos) __P(protos)
  68 #endif /*!_PARAMS*/
  69
  70 #ifndef __STDC__
  71 # define const
  72 #endif
  73 #define _IO_UNIFIED_JUMPTABLES 1
  74 #if !_G_HAVE_PRINTF_FP
  75 # define _IO_USE_DTOA 1
  76 #endif
  77
  78 #ifndef EOF
  79 # define EOF (-1)
  80 #endif
  81 #ifndef NULL
  82 # if defined __GNUG__ && \
  83     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
  84 #  define NULL (__null)
  85 # else
  86 #  if !defined(__cplusplus)
  87 #   define NULL ((void*)0)
  88 #  else
  89 #   define NULL (0)
  90 #  endif
  91 # endif
  92 #endif
  93
  94 #define _IOS_INPUT      1
  95 #define _IOS_OUTPUT     2
  96 #define _IOS_ATEND      4
  97 #define _IOS_APPEND     8
  98 #define _IOS_TRUNC      16
  99 #define _IOS_NOCREATE   32
 100 #define _IOS_NOREPLACE  64
 101 #define _IOS_BIN        128
 102
 103 /* Magic numbers and bits for the _flags field.
 104    The magic numbers use the high-order bits of _flags;
 105    the remaining bits are available for variable flags.
 106    Note: The magic numbers must all be negative if stdio
 107    emulation is desired. */
 108
 109 #define _IO_MAGIC 0xFBAD0000 /* Magic number */
 110 #define _OLD_STDIO_MAGIC 0xFABC0000 /* Emulate old stdio. */
 111 #define _IO_MAGIC_MASK 0xFFFF0000
 112 #define _IO_USER_BUF 1 /* User owns buffer; don't delete it on close. */
 113 #define _IO_UNBUFFERED 2
 114 #define _IO_NO_READS 4 /* Reading not allowed */
 115 #define _IO_NO_WRITES 8 /* Writing not allowd */
 116 #define _IO_EOF_SEEN 0x10
 117 #define _IO_ERR_SEEN 0x20
 118 #define _IO_DELETE_DONT_CLOSE 0x40 /* Don't call close(_fileno) on cleanup. */
 119 #define _IO_LINKED 0x80 /* Set if linked (using _chain) to streambuf::_list_all.*/
 120 #define _IO_IN_BACKUP 0x100
 121 #define _IO_LINE_BUF 0x200
 122 #define _IO_TIED_PUT_GET 0x400 /* Set if put and get pointer logicly tied. */
 123 #define _IO_CURRENTLY_PUTTING 0x800
 124 #define _IO_IS_APPENDING 0x1000
 125 #define _IO_IS_FILEBUF 0x2000
 126 #define _IO_BAD_SEEN 0x4000
 127
 128 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 129 #define _IO_SKIPWS 01
 130 #define _IO_LEFT 02
 131 #define _IO_RIGHT 04
 132 #define _IO_INTERNAL 010
 133 #define _IO_DEC 020
 134 #define _IO_OCT 040
 135 #define _IO_HEX 0100
 136 #define _IO_SHOWBASE 0200
 137 #define _IO_SHOWPOINT 0400
 138 #define _IO_UPPERCASE 01000
 139 #define _IO_SHOWPOS 02000
 140 #define _IO_SCIENTIFIC 04000
 141 #define _IO_FIXED 010000
 142 #define _IO_UNITBUF 020000
 143 #define _IO_STDIO 040000
 144 #define _IO_DONT_CLOSE 0100000
 145 #define _IO_BOOLALPHA 0200000
 146
 147
 148 struct _IO_jump_t;  struct _IO_FILE;
 149
 150 /* Handle lock.  */
 151 #ifdef _IO_MTSAFE_IO
 152 # if defined __GLIBC__ && __GLIBC__ >= 2
 153 #  include <bits/stdio-lock.h>
 154 #  define _IO_LOCK_T _IO_lock_t *
 155 # else
 156 /*# include <comthread.h>*/
 157 # endif
 158 #else
 159 /* XXX This will go away as soon as comthread is finished.  */
 160 # if defined __GLIBC__ && __GLIBC__ >= 2
 161 #  define _IO_LOCK_T void *
 162 # else
 163 #  ifdef __linux__
 164 struct _IO_lock_t {
 165   void *ptr;
 166   short int field1;
 167   short int field2;
 168 };
 169 #   define _IO_LOCK_T struct _IO_lock_t
 170 #  endif
 171 # endif
 172 #endif
 173
 174
 175 /* A streammarker remembers a position in a buffer. */
 176
 177 struct _IO_marker {
 178   struct _IO_marker *_next;
 179   struct _IO_FILE *_sbuf;
 180   /* If _pos >= 0
 181  it points to _buf->Gbase()+_pos. FIXME comment */
 182   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 183   int _pos;
 184 #if 0
 185     void set_streampos(streampos sp) { _spos = sp; }
 186     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 187   public:
 188     streammarker(streambuf *sb);
 189     ~streammarker();
 190     int saving() { return  _spos == -2; }
 191     int delta(streammarker&);
 192     int delta();
 193 #endif
 194 };
 195
 196 struct _IO_FILE {
 197   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 198 #define _IO_file_flags _flags
 199
 200   /* The following pointers correspond to the C++ streambuf protocol. */
 201   /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
 202   char* _IO_read_ptr;   /* Current read pointer */
 203   char* _IO_read_end;   /* End of get area. */
 204   char* _IO_read_base;  /* Start of putback+get area. */
 205   char* _IO_write_base; /* Start of put area. */
 206   char* _IO_write_ptr;  /* Current put pointer. */
 207   char* _IO_write_end;  /* End of put area. */
 208   char* _IO_buf_base;   /* Start of reserve area. */
 209   char* _IO_buf_end;    /* End of reserve area. */
 210   /* The following fields are used to support backing up and undo. */
 211   char *_IO_save_base; /* Pointer to start of non-current get area. */
 212   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 213   char *_IO_save_end; /* Pointer to end of non-current get area. */
 214
 215   struct _IO_marker *_markers;
 216
 217   struct _IO_FILE *_chain;
 218
 219   int _fileno;
 220   int _blksize;
 221   _IO_off_t _offset;
 222
 223 #define __HAVE_COLUMN /* temporary */
 224   /* 1+column number of pbase(); 0 is unknown. */
 225   unsigned short _cur_column;
 226   char _unused;
 227   char _shortbuf[1];
 228
 229   /*  char* _save_gptr;  char* _save_egptr; */
 230
 231 #ifdef _IO_LOCK_T
 232   _IO_LOCK_T _lock;
 233 #endif
 234 };
 235
 236 #ifndef __cplusplus
 237 typedef struct _IO_FILE _IO_FILE;
 238 #endif
 239
 240 struct _IO_FILE_plus;
 241 extern struct _IO_FILE_plus _IO_stdin_, _IO_stdout_, _IO_stderr_;
 242 #define _IO_stdin ((_IO_FILE*)(&_IO_stdin_))
 243 #define _IO_stdout ((_IO_FILE*)(&_IO_stdout_))
 244 #define _IO_stderr ((_IO_FILE*)(&_IO_stderr_))
 245
 246
 247 /* Define the user-visible type, with user-friendly member names.  */
 248 typedef struct
 249 {
 250   _IO_ssize_t (*read) __P ((struct _IO_FILE *, void *, _IO_ssize_t));
 251   _IO_ssize_t (*write) __P ((struct _IO_FILE *, const void *, _IO_ssize_t));
 252   _IO_fpos_t (*seek) __P ((struct _IO_FILE *, _IO_off_t, int));
 253   int (*close) __P ((struct _IO_FILE *));
 254 } _IO_cookie_io_functions_t;
 255
 256 /* Special file type for fopencookie function.  */
 257 struct _IO_cookie_file
 258 {
 259   struct _IO_FILE file;
 260   const void *vtable;
 261   void *cookie;
 262   _IO_cookie_io_functions_t io_functions;
 263 };
 264
 265
 266 #ifdef __cplusplus
 267 extern "C" {
 268 #endif
 269
 270 extern int __underflow __P ((_IO_FILE *));
 271 extern int __uflow __P ((_IO_FILE *));
 272 extern int __overflow __P ((_IO_FILE *, int));
 273
 274 #define _IO_getc_unlocked(_fp) \
 275        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end ? __uflow (_fp) \
 276         : *(unsigned char *) (_fp)->_IO_read_ptr++)
 277 #define _IO_peekc_unlocked(_fp) \
 278        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end \
 279           && __underflow (_fp) == EOF ? EOF \
 280         : *(unsigned char *) (_fp)->_IO_read_ptr)
 281
 282 #define _IO_putc_unlocked(_ch, _fp) \
 283    (((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end) \
 284     ? __overflow (_fp, (unsigned char) (_ch)) \
 285     : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))
 286
 287 #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 288 #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 289
 290 extern int _IO_getc __P ((_IO_FILE *__fp));
 291 extern int _IO_putc __P ((int __c, _IO_FILE *__fp));
 292 extern int _IO_feof __P ((_IO_FILE *__fp));
 293 extern int _IO_ferror __P ((_IO_FILE *__fp));
 294
 295 extern int _IO_peekc_locked __P ((_IO_FILE *__fp));
 296
 297 /* This one is for Emacs. */
 298 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 299         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 300
 301 extern void _IO_flockfile __P ((_IO_FILE *));
 302 extern void _IO_funlockfile __P ((_IO_FILE *));
 303 extern int _IO_ftrylockfile __P ((_IO_FILE *));
 304
 305 #ifdef _IO_MTSAFE_IO
 306 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
 307 #else
 308 # define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 309 # define _IO_flockfile(_fp) /**/
 310 # define _IO_funlockfile(_fp) /**/
 311 # define _IO_ftrylockfile(_fp) /**/
 312 # define _IO_cleanup_region_start(_fct, _fp) /**/
 313 # define _IO_cleanup_region_end(_Doit) /**/
 314 #endif /* !_IO_MTSAFE_IO */
 315
 316
 317 extern int _IO_vfscanf __P ((_IO_FILE *, const char *, _IO_va_list, int *));
 318 extern int _IO_vfprintf __P ((_IO_FILE *, const char *, _IO_va_list));
 319 extern _IO_ssize_t _IO_padn __P ((_IO_FILE *, int, _IO_ssize_t));
 320 extern _IO_size_t _IO_sgetn __P ((_IO_FILE *, void *, _IO_size_t));
 321
 322 extern _IO_fpos_t _IO_seekoff __P ((_IO_FILE *, _IO_off_t, int, int));
 323 extern _IO_fpos_t _IO_seekpos __P ((_IO_FILE *, _IO_fpos_t, int));
 324
 325 extern void _IO_free_backup_area __P ((_IO_FILE *));
 326
 327 #ifdef __cplusplus
 328 }
 329 #endif
 330
 331 #endif /* _IO_STDIO_H */