/*
   ============================================================================
	libc.h -- "One stop source" of C library definitions for the Buchla 700
	Version 4 -- 1987-07-01 -- D.N. Lynx Crowe

	This defines a lot of what fspars.h, stdio.h, io.h, and fcntl.h
	have to offer,	which means, of course, that you must not use
	this header file if you use one of those.
   ============================================================================
*/

#include "fspars.h"		/* file system parameters */

extern int errno;		/* most recent error code */

struct channel {

	char c_read;
	char c_write;
	char c_ioctl;
	char c_seek;
	int (*c_close)();
	arg c_arg;
} ;

struct channel chantab[MAXCHAN];

#define NULL 0
#define EOF -1

#define _BUSY	0x01
#define _ALLBUF	0x02
#define _DIRTY	0x04
#define _EOF	0x08
#define _IOERR	0x10

typedef struct {

	char	*_bp;		/* current position in buffer */
	char	*_bend;		/* last character in buffer + 1 */
	char	*_buff;		/* address of buffer */
	char	_flags;		/* {_BUSY, _ALLBUF, _DIRTY, _EOF, _IOERR} */
	char	_unit;		/* fd token returned by open */
	char	_bytbuf;	/* single byte buffer for unbuffered streams */
	char	_pad;		/* pad for alignment -- possibly use later */
	int	_buflen;	/* length of buffer */

} FILE;

extern	FILE Cbuffs[NSTREAMS];		/* table of FILE structures */
extern	char *Stdbufs;			/* free list of buffers */
extern	long ftell();

#define stdin (&Cbuffs[0])
#define stdout (&Cbuffs[1])
#define stderr (&Cbuffs[2])
#define getchar() agetc(stdin)
#define putchar(c) aputc(c, stdout)
#define feof(fp) (((fp)->_flags&_EOF)!=0)
#define ferror(fp) (((fp)->_flags&_IOERR)!=0)
#define clearerr(fp) ((fp)->_flags &= ~(_IOERR|_EOF))
#define fileno(fp) ((fp)->_unit)

#define	O_RDONLY	0x0000	/* Read-only value  */
#define	O_WRONLY	0x0001	/* Write-only value */
#define	O_RDWR		0x0002	/* Read-write value */

#define O_NDELAY	0x0004	/* Non-blocking I/O flag */
#define O_APPEND	0x0008	/* Append mode flag (write only at end) */

#define O_CREAT		0x0100	/* File creation flag (uses 3rd argument) */
#define O_TRUNC		0x0200	/* File truncation flag */
#define O_EXCL		0x0400	/* Exclusive access flag */

#define	O_RAW		0x8000	/* Raw (binary) I/O flag for getc and putc */