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
  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 #ifdef __STDC__
  55 #define __P(protos) protos
  56 #else
  57 #define __P(protos) ()
  58 #endif
  59 #endif /*!__P*/
  60
  61 /* For backward compatibility */
  62 #ifndef _PARAMS
  63 #define _PARAMS(protos) __P(protos)
  64 #endif /*!_PARAMS*/
  65
  66 #ifndef __STDC__
  67 #define const
  68 #endif
  69 #define _IO_UNIFIED_JUMPTABLES 1
  70
  71 #if 0
  72 #ifdef _IO_NEED_STDARG_H
  73 #include <stdarg.h>
  74 #endif
  75 #endif
  76
  77 #ifndef EOF
  78 #define EOF (-1)
  79 #endif
  80 #ifndef NULL
  81 #if !defined(__cplusplus) || defined(__GNUC__)
  82 #define NULL ((void*)0)
  83 #else
  84 #define NULL (0)
  85 #endif
  86 #endif
  87
  88 #define _IOS_INPUT      1
  89 #define _IOS_OUTPUT     2
  90 #define _IOS_ATEND      4
  91 #define _IOS_APPEND     8
  92 #define _IOS_TRUNC      16
  93 #define _IOS_NOCREATE   32
  94 #define _IOS_NOREPLACE  64
  95 #define _IOS_BIN        128
  96
  97 /* Magic numbers and bits for the _flags field.
  98    The magic numbers use the high-order bits of _flags;
  99    the remaining bits are abailable for variable flags.
 100    Note: The magic numbers must all be negative if stdio
 101    emulation is desired. */
 102
 103 #define _IO_MAGIC 0xFBAD0000 /* Magic number */
 104 #define _OLD_STDIO_MAGIC 0xFABC0000 /* Emulate old stdio. */
 105 #define _IO_MAGIC_MASK 0xFFFF0000
 106 #define _IO_USER_BUF 1 /* User owns buffer; don't delete it on close. */
 107 #define _IO_UNBUFFERED 2
 108 #define _IO_NO_READS 4 /* Reading not allowed */
 109 #define _IO_NO_WRITES 8 /* Writing not allowd */
 110 #define _IO_EOF_SEEN 0x10
 111 #define _IO_ERR_SEEN 0x20
 112 #define _IO_DELETE_DONT_CLOSE 0x40 /* Don't call close(_fileno) on cleanup. */
 113 #define _IO_LINKED 0x80 /* Set if linked (using _chain) to streambuf::_list_all.*/
 114 #define _IO_IN_BACKUP 0x100
 115 #define _IO_LINE_BUF 0x200
 116 #define _IO_TIED_PUT_GET 0x400 /* Set if put and get pointer logicly tied. */
 117 #define _IO_CURRENTLY_PUTTING 0x800
 118 #define _IO_IS_APPENDING 0x1000
 119 #define _IO_IS_FILEBUF 0x2000
 120
 121 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 122 #define _IO_SKIPWS 01
 123 #define _IO_LEFT 02
 124 #define _IO_RIGHT 04
 125 #define _IO_INTERNAL 010
 126 #define _IO_DEC 020
 127 #define _IO_OCT 040
 128 #define _IO_HEX 0100
 129 #define _IO_SHOWBASE 0200
 130 #define _IO_SHOWPOINT 0400
 131 #define _IO_UPPERCASE 01000
 132 #define _IO_SHOWPOS 02000
 133 #define _IO_SCIENTIFIC 04000
 134 #define _IO_FIXED 010000
 135 #define _IO_UNITBUF 020000
 136 #define _IO_STDIO 040000
 137 #define _IO_DONT_CLOSE 0100000
 138
 139
 140 struct _IO_jump_t;  struct _IO_FILE;
 141
 142 /* Define the user-visible type, with user-friendly member names.  */
 143 typedef struct
 144 {
 145   _IO_ssize_t (*read) __P ((struct _IO_FILE *, void *, _IO_ssize_t));
 146   _IO_ssize_t (*write) __P ((struct _IO_FILE *, const void *, _IO_ssize_t));
 147   _IO_fpos_t (*seek) __P ((struct _IO_FILE *, _IO_off_t, int));
 148   int (*close) __P ((struct _IO_FILE *));
 149 } _IO_cookie_io_functions_t;
 150
 151
 152 /* The reentrant version of the libio implementation needs a semaphore for
 153    each _IO_FILE struture.  Because we don't know how the semaphore
 154    will be implemented we try to be very general.  */
 155 struct _IO_lock_t {
 156   void *ptr;
 157   short int field1;
 158   short int field2;
 159 };
 160
 161 /* A streammarker remembers a position in a buffer. */
 162
 163 struct _IO_marker {
 164   struct _IO_marker *_next;
 165   struct _IO_FILE *_sbuf;
 166   /* If _pos >= 0
 167  it points to _buf->Gbase()+_pos. FIXME comment */
 168   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 169   int _pos;
 170 #if 0
 171     void set_streampos(streampos sp) { _spos = sp; }
 172     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 173   public:
 174     streammarker(streambuf *sb);
 175     ~streammarker();
 176     int saving() { return  _spos == -2; }
 177     int delta(streammarker&);
 178     int delta();
 179 #endif
 180 };
 181
 182 struct _IO_FILE {
 183   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 184 #define _IO_file_flags _flags
 185
 186   /* The following pointers correspond to the C++ streambuf protocol. */
 187   char* _IO_read_ptr;   /* Current read pointer */
 188   char* _IO_read_end;   /* End of get area. */
 189   char* _IO_read_base;  /* Start of putback+get area. */
 190   char* _IO_write_base; /* Start of put area. */
 191   char* _IO_write_ptr;  /* Current put pointer. */
 192   char* _IO_write_end;  /* End of put area. */
 193   char* _IO_buf_base;   /* Start of reserve area. */
 194   char* _IO_buf_end;    /* End of reserve area. */
 195   /* The following fields are used to support backing up and undo. */
 196   char *_IO_save_base; /* Pointer to start of non-current get area. */
 197   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 198   char *_IO_save_end; /* Pointer to end of non-current get area. */
 199
 200   struct _IO_marker *_markers;
 201
 202   struct _IO_FILE *_chain;
 203
 204 #if  !_IO_UNIFIED_JUMPTABLES
 205   struct _IO_jump_t *_jumps; /* Jump table */
 206 #endif
 207
 208   int _fileno;
 209   int _blksize;
 210   _IO_off_t _offset;
 211
 212 #define __HAVE_COLUMN /* temporary */
 213   /* 1+column number of pbase(); 0 is unknown. */
 214   unsigned short _cur_column;
 215   char _unused;
 216   char _shortbuf[1];
 217
 218   /*  char* _save_gptr;  char* _save_egptr; */
 219
 220   struct _IO_lock_t _IO_lock;
 221 };
 222
 223 #ifndef __cplusplus
 224 typedef struct _IO_FILE _IO_FILE;
 225 #endif
 226
 227 struct _IO_FILE_plus;
 228 extern struct _IO_FILE_plus _IO_stdin_, _IO_stdout_, _IO_stderr_;
 229 #define _IO_stdin ((_IO_FILE*)(&_IO_stdin_))
 230 #define _IO_stdout ((_IO_FILE*)(&_IO_stdout_))
 231 #define _IO_stderr ((_IO_FILE*)(&_IO_stderr_))
 232
 233 #ifdef __cplusplus
 234 extern "C" {
 235 #endif
 236
 237 extern int __underflow __P((_IO_FILE*));
 238 extern int __uflow __P((_IO_FILE*));
 239 extern int __overflow __P((_IO_FILE*, int));
 240
 241 #define _IO_getc(_fp) \
 242        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end ? __uflow(_fp) \
 243         : *(unsigned char*)(_fp)->_IO_read_ptr++)
 244 #define _IO_peekc(_fp) \
 245        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end \
 246           && __underflow(_fp) == EOF ? EOF \
 247         : *(unsigned char*)(_fp)->_IO_read_ptr)
 248
 249 #define _IO_putc(_ch, _fp) \
 250    (((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end) \
 251     ? __overflow(_fp, (unsigned char)(_ch)) \
 252     : (unsigned char)(*(_fp)->_IO_write_ptr++ = (_ch)))
 253
 254 #define _IO_feof(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 255 #define _IO_ferror(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 256
 257 /* This one is for Emacs. */
 258 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 259         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 260
 261 extern int _IO_vfscanf __P((_IO_FILE*, const char*, _IO_va_list, int*));
 262 extern int _IO_vfprintf __P((_IO_FILE*, const char*, _IO_va_list));
 263 extern _IO_ssize_t _IO_padn __P((_IO_FILE *, int, _IO_ssize_t));
 264 extern _IO_size_t _IO_sgetn __P((_IO_FILE *, void*, _IO_size_t));
 265
 266 extern void _IO_free_backup_area __P((_IO_FILE*));
 267
 268 #ifdef __cplusplus
 269 }
 270 #endif
 271
 272 #endif /* _IO_STDIO_H */