object.h

操作系统源代码

/* $Header: object.h,v 1.7 91/01/18 09:54:23 ceriel Exp $ */
/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
#include "byte_order.h"
#include <local.h>
#include <stdio.h>

#if CHAR_UNSIGNED
#define Xchar(ch)	(ch)
#else
#define Xchar(ch)	((ch) & 0377)
#endif

#if ! defined(BYTES_REVERSED)
#define BYTES_REVERSED 1
#endif

#if ! defined(WORDS_REVERSED)
#define WORDS_REVERSED 1
#endif

#if BYTES_REVERSED
#define uget2(c)	(Xchar((c)[0]) | ((unsigned) Xchar((c)[1]) << 8))
#define Xput2(i, c)	(((c)[0] = (i)), ((c)[1] = (i) >> 8))
#define put2(i, c)	{ register int j = (i); Xput2(j, c); }
#else
#define uget2(c)	(* ((unsigned short *) (c)))
#define Xput2(i, c)	(* ((short *) (c)) = (i))
#define put2(i, c)	Xput2(i, c)
#endif

#define get2(c)		((short) uget2(c))

#if WORDS_REVERSED || BYTES_REVERSED
#define get4(c)		(uget2(c) | ((long) uget2((c)+2) << 16))
#define put4(l, c)	{ register long x=(l); \
			  Xput2((int)x,c); \
			  Xput2((int)(x>>16),(c)+2); \
			}
#else
#define get4(c)		(* ((long *) (c)))
#define put4(l, c)	(* ((long *) (c)) = (l))
#endif

#define SECTCNT	3	/* number of sections with own output buffer */
#if BIGMACHINE
#define WBUFSIZ	(8*BUFSIZ)
#else
#define WBUFSIZ	BUFSIZ
#endif

struct fil {
	int	cnt;
	char	*pnow;
	char	*pbegin;
	long	currpos;
	int	fd;
	char	pbuf[WBUFSIZ];
};

extern struct fil __parts[];

#define	PARTEMIT	0
#define	PARTRELO	(PARTEMIT+SECTCNT)
#define	PARTNAME	(PARTRELO+1)
#define	PARTCHAR	(PARTNAME+1)
#ifdef SYMDBUG
#define PARTDBUG	(PARTCHAR+1)
#else
#define PARTDBUG	(PARTCHAR+0)
#endif
#define	NPARTS		(PARTDBUG + 1)

#define getsect(s)      (PARTEMIT+((s)>=(SECTCNT-1)?(SECTCNT-1):(s)))