minix/lib/ack/libp/pac.c

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/* $Header$ */
/*
* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
*
* This product is part of the Amsterdam Compiler Kit.
*
* Permission to use, sell, duplicate or disclose this software must be
* obtained in writing. Requests for such permissions may be sent to
*
* Dr. Andrew S. Tanenbaum
* Wiskundig Seminarium
* Vrije Universiteit
* Postbox 7161
* 1007 MC Amsterdam
* The Netherlands
*
*/
/* Author: J.W. Stevenson */
#include <pc_err.h>
extern _trp();
#define assert(x) /* nothing */
#ifndef EM_WSIZE
#define EM_WSIZE _EM_WSIZE
#endif
struct descr {
int low;
int diff;
int size;
};
_pac(ad,zd,zp,i,ap) int i; struct descr *ad,*zd; char *zp,*ap; {
if (zd->diff > ad->diff ||
(i -= ad->low) < 0 ||
(i+zd->diff) > ad->diff)
_trp(EPACK);
ap += (i * ad->size);
i = (zd->diff + 1) * zd->size;
if (zd->size == 1) {
int *aptmp = (int *)ap;
assert(ad->size == EM_WSIZE);
while (--i >= 0)
*zp++ = *aptmp++;
#if EM_WSIZE > 2
} else if (zd->size == 2) {
int *aptmp = (int *)ap;
short *zptmp = (short *) zp;
assert(ad->size == EM_WSIZE);
while (--i >= 0)
*zptmp++ = *aptmp++;
#endif
} else {
assert(ad->size == zd->size);
while (--i >= 0)
*zp++ = *ap++;
}
}