libio/libio.h

   1 /*
   2 Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation
   3
   4 This file is part of the GNU IO Library.  This library is free
   5 software; you can redistribute it and/or modify it under the
   6 terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This 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
  13 GNU 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 the Free
  17 Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 As a special exception, if you link this library with files
  20 compiled with a GNU compiler to produce an executable, this does not cause
  21 the resulting executable to be covered by the GNU General Public License.
  22 This exception does not however invalidate any other reasons why
  23 the executable file might be covered by the GNU General Public License. */
  24
  25 /* This is part of the iostream library.  Written by Per Bothner. */
  26
  27 #ifndef _IO_STDIO_H
  28 #define _IO_STDIO_H
  29 #include <features.h>
  30
  31 #include <_G_config.h>
  32 #define _IO_pos_t _G_fpos_t /* obsolete */
  33 #define _IO_fpos_t _G_fpos_t
  34 #define _IO_size_t _G_size_t
  35 #define _IO_ssize_t _G_ssize_t
  36 #define _IO_off_t _G_off_t
  37 #define _IO_pid_t _G_pid_t
  38 #define _IO_uid_t _G_uid_t
  39 #define _IO_HAVE_SYS_WAIT _G_HAVE_SYS_WAIT
  40 #define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE
  41 #define _IO_BUFSIZ _G_BUFSIZ
  42 #define _IO_va_list _G_va_list
  43
  44 #ifdef _G_NEED_STDARG_H
  45 /* This define avoids name pollution if we're using GNU stdarg.h */
  46 #define __need___va_list
  47 #include <stdarg.h>
  48 #ifdef __GNUC_VA_LIST
  49 #undef _IO_va_list
  50 #define _IO_va_list __gnuc_va_list
  51 #endif /* __GNUC_VA_LIST */
  52 #endif
  53
  54 #ifndef __P
  55 #if _G_HAVE_SYS_CDEFS
  56 #include <sys/cdefs.h>
  57 #else
  58 #ifdef __STDC__
  59 #define __P(protos) protos
  60 #else
  61 #define __P(protos) ()
  62 #endif
  63 #endif
  64 #endif /*!__P*/
  65
  66 /* For backward compatibility */
  67 #ifndef _PARAMS
  68 #define _PARAMS(protos) __P(protos)
  69 #endif /*!_PARAMS*/
  70
  71 #ifndef __STDC__
  72 #define const
  73 #endif
  74 #define _IO_UNIFIED_JUMPTABLES 1
  75
  76 #if 0
  77 #ifdef _IO_NEED_STDARG_H
  78 #include <stdarg.h>
  79 #endif
  80 #endif
  81
  82 #ifndef EOF
  83 #define EOF (-1)
  84 #endif
  85 #ifndef NULL
  86 #if defined __GNUG__ && \
  87     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
  88 #define NULL (__null)
  89 #else
  90 #if !defined(__cplusplus)
  91 #define NULL ((void*)0)
  92 #else
  93 #define NULL (0)
  94 #endif
  95 #endif
  96 #endif
  97
  98 #define _IOS_INPUT      1
  99 #define _IOS_OUTPUT     2
 100 #define _IOS_ATEND      4
 101 #define _IOS_APPEND     8
 102 #define _IOS_TRUNC      16
 103 #define _IOS_NOCREATE   32
 104 #define _IOS_NOREPLACE  64
 105 #define _IOS_BIN        128
 106
 107 /* Magic numbers and bits for the _flags field.
 108    The magic numbers use the high-order bits of _flags;
 109    the remaining bits are available for variable flags.
 110    Note: The magic numbers must all be negative if stdio
 111    emulation is desired. */
 112
 113 #define _IO_MAGIC 0xFBAD0000 /* Magic number */
 114 #define _OLD_STDIO_MAGIC 0xFABC0000 /* Emulate old stdio. */
 115 #define _IO_MAGIC_MASK 0xFFFF0000
 116 #define _IO_USER_BUF 1 /* User owns buffer; don't delete it on close. */
 117 #define _IO_UNBUFFERED 2
 118 #define _IO_NO_READS 4 /* Reading not allowed */
 119 #define _IO_NO_WRITES 8 /* Writing not allowd */
 120 #define _IO_EOF_SEEN 0x10
 121 #define _IO_ERR_SEEN 0x20
 122 #define _IO_DELETE_DONT_CLOSE 0x40 /* Don't call close(_fileno) on cleanup. */
 123 #define _IO_LINKED 0x80 /* Set if linked (using _chain) to streambuf::_list_all.*/
 124 #define _IO_IN_BACKUP 0x100
 125 #define _IO_LINE_BUF 0x200
 126 #define _IO_TIED_PUT_GET 0x400 /* Set if put and get pointer logicly tied. */
 127 #define _IO_CURRENTLY_PUTTING 0x800
 128 #define _IO_IS_APPENDING 0x1000
 129 #define _IO_IS_FILEBUF 0x2000
 130 #define _IO_BAD_SEEN 0x4000
 131
 132 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 133 #define _IO_SKIPWS 01
 134 #define _IO_LEFT 02
 135 #define _IO_RIGHT 04
 136 #define _IO_INTERNAL 010
 137 #define _IO_DEC 020
 138 #define _IO_OCT 040
 139 #define _IO_HEX 0100
 140 #define _IO_SHOWBASE 0200
 141 #define _IO_SHOWPOINT 0400
 142 #define _IO_UPPERCASE 01000
 143 #define _IO_SHOWPOS 02000
 144 #define _IO_SCIENTIFIC 04000
 145 #define _IO_FIXED 010000
 146 #define _IO_UNITBUF 020000
 147 #define _IO_STDIO 040000
 148 #define _IO_DONT_CLOSE 0100000
 149 #define _IO_BOOLALPHA 0200000
 150
 151
 152 struct _IO_jump_t;  struct _IO_FILE;
 153
 154 /* Handle lock.  */
 155 #ifdef _IO_MTSAFE_IO
 156 #include <bits/stdio-lock.h>
 157 #else
 158 typedef void _IO_lock_t;
 159 #endif
 160
 161
 162 /* A streammarker remembers a position in a buffer. */
 163
 164 struct _IO_marker {
 165   struct _IO_marker *_next;
 166   struct _IO_FILE *_sbuf;
 167   /* If _pos >= 0
 168  it points to _buf->Gbase()+_pos. FIXME comment */
 169   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 170   int _pos;
 171 #if 0
 172     void set_streampos(streampos sp) { _spos = sp; }
 173     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 174   public:
 175     streammarker(streambuf *sb);
 176     ~streammarker();
 177     int saving() { return  _spos == -2; }
 178     int delta(streammarker&);
 179     int delta();
 180 #endif
 181 };
 182
 183 struct _IO_FILE {
 184   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 185 #define _IO_file_flags _flags
 186
 187   /* The following pointers correspond to the C++ streambuf protocol. */
 188   /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
 189   char* _IO_read_ptr;   /* Current read pointer */
 190   char* _IO_read_end;   /* End of get area. */
 191   char* _IO_read_base;  /* Start of putback+get area. */
 192   char* _IO_write_base; /* Start of put area. */
 193   char* _IO_write_ptr;  /* Current put pointer. */
 194   char* _IO_write_end;  /* End of put area. */
 195   char* _IO_buf_base;   /* Start of reserve area. */
 196   char* _IO_buf_end;    /* End of reserve area. */
 197   /* The following fields are used to support backing up and undo. */
 198   char *_IO_save_base; /* Pointer to start of non-current get area. */
 199   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 200   char *_IO_save_end; /* Pointer to end of non-current get area. */
 201
 202   struct _IO_marker *_markers;
 203
 204   struct _IO_FILE *_chain;
 205
 206   int _fileno;
 207   int _blksize;
 208   _IO_off_t _offset;
 209
 210 #define __HAVE_COLUMN /* temporary */
 211   /* 1+column number of pbase(); 0 is unknown. */
 212   unsigned short _cur_column;
 213   char _unused;
 214   char _shortbuf[1];
 215
 216   /*  char* _save_gptr;  char* _save_egptr; */
 217
 218   _IO_lock_t *_lock;
 219 };
 220
 221 #ifndef __cplusplus
 222 typedef struct _IO_FILE _IO_FILE;
 223 #endif
 224
 225 struct _IO_FILE_plus;
 226 extern struct _IO_FILE_plus _IO_stdin_, _IO_stdout_, _IO_stderr_;
 227 #define _IO_stdin ((_IO_FILE*)(&_IO_stdin_))
 228 #define _IO_stdout ((_IO_FILE*)(&_IO_stdout_))
 229 #define _IO_stderr ((_IO_FILE*)(&_IO_stderr_))
 230
 231
 232 /* Define the user-visible type, with user-friendly member names.  */
 233 typedef struct
 234 {
 235   _IO_ssize_t (*read) __P ((struct _IO_FILE *, void *, _IO_ssize_t));
 236   _IO_ssize_t (*write) __P ((struct _IO_FILE *, const void *, _IO_ssize_t));
 237   _IO_fpos_t (*seek) __P ((struct _IO_FILE *, _IO_off_t, int));
 238   int (*close) __P ((struct _IO_FILE *));
 239 } _IO_cookie_io_functions_t;
 240
 241 /* Special file type for fopencookie function.  */
 242 struct _IO_cookie_file {
 243   struct _IO_FILE file;
 244   const void *vtable;
 245   void *cookie;
 246   _IO_cookie_io_functions_t io_functions;
 247 };
 248
 249
 250 #ifdef __cplusplus
 251 extern "C" {
 252 #endif
 253
 254 extern int __underflow __P((_IO_FILE*));
 255 extern int __uflow __P((_IO_FILE*));
 256 extern int __overflow __P((_IO_FILE*, int));
 257
 258 #define _IO_getc_unlocked(_fp) \
 259        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end ? __uflow(_fp) \
 260         : *(unsigned char*)(_fp)->_IO_read_ptr++)
 261 #define _IO_peekc_unlocked(_fp) \
 262        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end \
 263           && __underflow(_fp) == EOF ? EOF \
 264         : *(unsigned char*)(_fp)->_IO_read_ptr)
 265
 266 #define _IO_putc_unlocked(_ch, _fp) \
 267    (((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end) \
 268     ? __overflow(_fp, (unsigned char)(_ch)) \
 269     : (unsigned char)(*(_fp)->_IO_write_ptr++ = (_ch)))
 270
 271 #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 272 #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 273
 274 extern int _IO_getc __P ((_IO_FILE *__fp));
 275 extern int _IO_putc __P ((int __c, _IO_FILE *__fp));
 276 extern int _IO_feof __P ((_IO_FILE *__fp));
 277 extern int _IO_ferror __P ((_IO_FILE *__fp));
 278
 279 extern int _IO_peekc_locked __P ((_IO_FILE *__fp));
 280
 281 /* This one is for Emacs. */
 282 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 283         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 284
 285 extern void _IO_flockfile __P ((_IO_FILE *));
 286 extern void _IO_funlockfile __P ((_IO_FILE *));
 287 extern int _IO_ftrylockfile __P ((_IO_FILE *));
 288
 289 #ifndef _IO_MTSAFE_IO
 290 # define _IO_flockfile(_fp) /**/
 291 # define _IO_funlockfile(_fp) /**/
 292 # define _IO_ftrylockfile(_fp) /**/
 293 # define _IO_cleanup_region_start(_fct, _fp) /**/
 294 # define _IO_cleanup_region_end(_Doit) /**/
 295 #endif /* !_IO_MTSAFE_IO */
 296
 297 /* XXX Should we allow a symbol to be defined which selects the efficient
 298   implementation when the user is really sure no threaded functions ever
 299   will be used?  */
 300 #if 1
 301 # define _IO_getc(_fp) _IO_getc (_fp)
 302 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
 303 # define _IO_putc(_ch, _fp) _IO_putc (_ch, _fp)
 304 # define _IO_feof(_fp) _IO_feof (_fp)
 305 # define _IO_ferror(_fp) _IO_ferror (_fp)
 306 #else
 307 # define _IO_getc(_fp) _IO_getc_unlocked (_fp)
 308 # define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 309 # define _IO_putc(_ch, _fp) _IO_putc_unlocked (_ch, _fp)
 310 # define _IO_feof(_fp) _IO_feof_unlocked (_fp)
 311 # define _IO_ferror(_fp) _IO_ferror_unlocked (_fp)
 312 #endif
 313
 314 extern int _IO_vfscanf __P((_IO_FILE*, const char*, _IO_va_list, int*));
 315 extern int _IO_vfprintf __P((_IO_FILE*, const char*, _IO_va_list));
 316 extern _IO_ssize_t _IO_padn __P((_IO_FILE *, int, _IO_ssize_t));
 317 extern _IO_size_t _IO_sgetn __P((_IO_FILE *, void*, _IO_size_t));
 318
 319 extern _IO_fpos_t _IO_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
 320 extern _IO_fpos_t _IO_seekpos __P((_IO_FILE*, _IO_fpos_t, int));
 321
 322 extern void _IO_free_backup_area __P((_IO_FILE*));
 323
 324 #ifdef __cplusplus
 325 }
 326 #endif
 327
 328 #endif /* _IO_STDIO_H */