blkcopy.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 72 行

head	1.2;
access;
symbols;
locks
	dls:1.2; strict;
comment	@ * @;


1.2
date	97.09.21.19.29.30;	author dls;	state Dist;
branches;
next	1.1;

1.1
date	94.08.12.18.54.39;	author dls;	state Old;
branches;
next	;


desc
@@


1.2
log
@pre-3e code
@
text
@/* blkcopy.c - blkcopy */

#include <kernel.h>

/*------------------------------------------------------------------------
 *  blkcopy  -  copy a block of memory form one location to another
 *------------------------------------------------------------------------
 */
blkcopy(to, from, nbytes)
register char	*to;
register char	*from;
register int	nbytes;
{
#ifdef notdef
extern int currpid;
if ((to >= 640*1024 && to <= 1024*1024) && to != 0xd3a00)
kprintf("pid %d blkcopy(%X,%X,%d)\n", currpid, to, from, nbytes);
#endif
	if (from > to) {
		while (--nbytes >= 0)
			*to++ = *from++;
	} else {
		to += nbytes-1;
		from += nbytes-1;
		while (--nbytes >= 0)
			*to-- = *from--;
	}
	return OK;
}
@


1.1
log
@Initial revision
@
text
@d14 15
a28 3
	while (--nbytes >= 0)
		*to++ = *from++;
	return(OK);
@