11713Smckusick /* Copyright (c) 1979 Regents of the University of California */
21713Smckusick 
3*3038Smckusic static char sccsid[] = "@(#)UNPACK.c 1.2 03/07/81";
41713Smckusick 
51713Smckusick #include "h01errs.h"
61713Smckusick 
71713Smckusick /*
81713Smckusick  * unpack(z,a,i)
91713Smckusick  *
101713Smckusick  * with:	z and a as in pack
111713Smckusick  *
121713Smckusick  * semantics:	for j := u to v do
131713Smckusick  *			a[j-u+i] := z[j]
141713Smckusick  */
151713Smckusick 
161713Smckusick UNPACK(i, a, z, size_a, lb_a, ub_a, size_z)
171713Smckusick 
18*3038Smckusic 	long	i;	/* subscript into a to begin packing */
191713Smckusick 	char	*a;	/* pointer to structure a */
201713Smckusick 	char	*z;	/* pointer to structure z */
21*3038Smckusic 	long	size_a;	/* sizeof(a_type) */
22*3038Smckusic 	long	lb_a;	/* lower bound of structure a */
23*3038Smckusic 	long	ub_a;	/* (upper bound of a) - (lb_a + sizeof(z_type)) */
24*3038Smckusic 	long	size_z;	/* sizeof(z_type) */
251713Smckusick {
261713Smckusick 	int		subscr;
271713Smckusick 	register char	*cp;
281713Smckusick 	register char	*zp = z;
291713Smckusick 	register char	*limit;
301713Smckusick 
311713Smckusick 	subscr = i - lb_a;
321713Smckusick 	if (subscr < 0 || subscr > ub_a) {
331713Smckusick 		ERROR(EPACK, i);
341713Smckusick 		return;
351713Smckusick 	}
361713Smckusick 	cp = &a[subscr * size_a];
371713Smckusick 	limit = cp + size_z;
381713Smckusick 	do	{
391713Smckusick 		*cp++ = *zp++;
401713Smckusick 	} while (cp < limit);
411713Smckusick }
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