/* 
Copyright (C) 1993 Free Software Foundation

This file is part of the GNU IO Library.  This library is free
software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

As a special exception, if you link this library with files
compiled with a GNU compiler to produce an executable, this does not cause
the resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License. */

/* This is part of the iostream library.
   Copyright (C) 1991, 1992 Per Bothner. */

#ifndef _IO_STDIO_H
#define _IO_STDIO_H
#ifdef __GNUG__
#pragma interface
#endif

#if 1
#include <_G_config.h>
#define _IO_pos_t _G_fpos_t /* obsolete */
#define _IO_fpos_t _G_fpos_t
#define _IO_size_t _G_size_t
#define _IO_ssize_t _G_ssize_t
#define _IO_off_t _G_off_t
#define _IO_pid_t _G_pid_t
#define _IO_HAVE_SYS_WAIT _G_HAVE_SYS_WAIT
#define _IO_BUFSIZ _G_BUFSIZ
#define _IO_va_list _G_va_list

#ifdef _G_NEED_STDARG_H
/* This define avoids name pollution if we're using GNU stdarg.h */
#define __need___va_list
#include <stdarg.h>
#ifdef __GNUC_VA_LIST
#undef _IO_va_list
#define _IO_va_list __gnuc_va_list
#endif /* __GNUC_VA_LIST */
#endif

#else
#include <_IO_config.h>
typedef _IO_fpos_t _IO_pos_t;
#endif

#ifndef _PARAMS
#ifdef __STDC__
#define _PARAMS(paramlist) paramlist
#else
#define _PARAMS(paramlist) ()
#endif
#endif /*!_PARAMS*/
#ifndef __STDC__
#define const
#endif
#define USE_DTOA

#if 0
#ifdef _IO_NEED_STDARG_H
#include <stdarg.h>
#endif
#endif

#ifndef EOF
#define EOF (-1)
#endif
#ifndef NULL
#if !defined(__cplusplus) || defined(__GNUC__)
#define NULL ((void*)0)
#else
#define NULL (0)
#endif
#endif

#define _IOS_INPUT	1
#define _IOS_OUTPUT	2
#define _IOS_ATEND	4
#define _IOS_APPEND	8
#define _IOS_TRUNC	16
#define _IOS_NOCREATE	32
#define _IOS_NOREPLACE	64
#define _IOS_BIN	128

/* Magic numbers and bits for the _flags field.
   The magic numbers use the high-order bits of _flags;
   the remaining bits are abailable for variable flags.
   Note: The magic numbers must all be negative if stdio
   emulation is desired. */

#define _IO_MAGIC 0xFBAD0000 /* Magic number */
#define _OLD_STDIO_MAGIC 0xFABC0000 /* Emulate old stdio. */
#define _IO_MAGIC_MASK 0xFFFF0000
#define _IO_USER_BUF 1 /* User owns buffer; don't delete it on close. */
#define _IO_UNBUFFERED 2
#define _IO_NO_READS 4 /* Reading not allowed */
#define _IO_NO_WRITES 8 /* Writing not allowd */
#define _IO_EOF_SEEN 0x10
#define _IO_ERR_SEEN 0x20
#define _IO_DELETE_DONT_CLOSE 0x40
#define _IO_LINKED 0x80 /* Set if linked (using _chain) to streambuf::_list_all.*/
#define _IO_IN_BACKUP 0x100
#define _IO_LINE_BUF 0x200
#define _IO_TIED_PUT_GET 0x400 /* Set if put and get pointer logicly tied. */
#define _IO_CURRENTLY_PUTTING 0x800
#define _IO_IS_APPENDING 0x1000
#define _IO_IS_FILEBUF 0x2000

/* These are "formatting flags" matching the iostream fmtflags enum values. */
#define _IO_SKIPWS 01
#define _IO_LEFT 02
#define _IO_RIGHT 04
#define _IO_INTERNAL 010
#define _IO_DEC 020
#define _IO_OCT 040
#define _IO_HEX 0100
#define _IO_SHOWBASE 0200
#define _IO_SHOWPOINT 0400
#define _IO_UPPERCASE 01000
#define _IO_SHOWPOS 02000
#define _IO_SCIENTIFIC 04000
#define _IO_FIXED 010000
#define _IO_UNITBUF 020000
#define _IO_STDIO 040000
#define _IO_DONT_CLOSE 0100000

/* A streammarker remembers a position in a buffer. */

struct _IO_marker {
  struct _IO_marker *_next;
  struct _IO_FILE *_sbuf;
  /* If _pos >= 0
 it points to _buf->Gbase()+_pos. FIXME comment */
  /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
  int _pos;
#if 0
    void set_streampos(streampos sp) { _spos = sp; }
    void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
  public:
    streammarker(streambuf *sb);
    ~streammarker();
    int saving() { return  _spos == -2; }
    int delta(streammarker&);
    int delta();
#endif
};

struct _IO_jump_t;

struct _IO_FILE {
  int _flags;		/* High-order word is _IO_MAGIC; rest is flags. */
#define _IO_file_flags _flags

  /* The following pointers correspond to the C++ streambuf protocol. */
  char* _IO_read_ptr;	/* Current read pointer */
  char* _IO_read_end;	/* End of get area. */
  char* _IO_read_base;	/* Start of putback+get area. */
  char* _IO_write_base;	/* Start of put area. */
  char* _IO_write_ptr;	/* Current put pointer. */
  char* _IO_write_end;	/* End of put area. */
  char* _IO_buf_base;	/* Start of reserve area. */
  char* _IO_buf_end;	/* End of reserve area. */
  /* The following fields are used to support backing up and undo. */
  char *_IO_save_base; /* Pointer to start of non-current get area. */
  char *_IO_backup_base;  /* Pointer to first valid character of backup area */
  char *_IO_save_end; /* Pointer to end of non-current get area. */

/* These names are temporary aliases. TODO */
#define _gptr _IO_read_ptr
#define _egptr _IO_read_end
#define _eback _IO_read_base
#define _pbase _IO_write_base
#define _pptr _IO_write_ptr
#define _epptr _IO_write_end
#define _base _IO_buf_base
#define _ebuf _IO_buf_end
#define _other_gbase _IO_save_base
#define _aux_limit _IO_backup_base
#define _other_egptr _IO_save_end

  struct _IO_marker *_markers;
  
  struct _IO_FILE *_chain;
  
  struct _IO_jump_t *_jumps; /* Jump table */
  
  int _fileno;
  int _blksize;
  _IO_off_t _offset;
  
#define __HAVE_COLUMN /* temporary */
  /* 1+column number of pbase(); 0 is unknown. */
  unsigned short _cur_column;
  char _unused;
  char _shortbuf[1];
  
  /*  char* _save_gptr;  char* _save_egptr; */
};

#ifndef __cplusplus
typedef struct _IO_FILE _IO_FILE;
#endif

/* We always allocate an extra word following an _IO_FILE.
   This is for compatibility with C++ streambuf; the word can
   be used to smash to a pointer to a virtual function table. */

struct _IO_FILE_plus {
  _IO_FILE _file;
  const void *_vtable;
};

extern struct _IO_FILE_plus _IO_stdin_, _IO_stdout_, _IO_stderr_;
#define _IO_stdin (&_IO_stdin_._file)
#define _IO_stdout (&_IO_stdout_._file)
#define _IO_stderr (&_IO_stderr_._file)

#ifdef __cplusplus
extern "C" {
#endif

extern int __underflow _PARAMS((_IO_FILE*));
extern int __overflow _PARAMS((_IO_FILE*, int));

extern unsigned __adjust_column _PARAMS((unsigned start, const char *line, int count));

#define _IO_getc(_fp) \
       ((_fp)->_gptr >= (_fp)->_egptr && __underflow(_fp) == EOF ? EOF \
	: *(unsigned char*)(_fp)->_gptr++)
#define _IO_peekc(_fp) \
       ((_fp)->_gptr >= (_fp)->_egptr && __underflow(_fp) == EOF ? EOF \
	: *(unsigned char*)(_fp)->_gptr)

#define _IO_putc(_ch, _fp) \
   (((_fp)->_pptr >= (_fp)->_epptr) \
    ? __overflow(_fp, (unsigned char)_ch) \
    : (unsigned char)(*(_fp)->_pptr++ = _ch))

extern int _IO_vfscanf _PARAMS((_IO_FILE*, const char*, _IO_va_list));
extern int _IO_vfprintf _PARAMS((_IO_FILE*, const char*, _IO_va_list));
extern _IO_ssize_t _IO_padn _PARAMS((_IO_FILE *, int, _IO_ssize_t));
extern _IO_size_t _IO_sgetn _PARAMS((_IO_FILE *, void*, _IO_size_t));

extern void _IO_free_backup_area _PARAMS((_IO_FILE*));

#ifdef __cplusplus
}
#endif

#endif /* _IO_STDIO_H */
