65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/*
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Module: runtime support for conformant arrays
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Author: Ceriel J.H. Jacobs
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Version: $Header$
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*/
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#include <m2_traps.h>
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#if EM_WSIZE==EM_PSIZE
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typedef unsigned pcnt;
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#else
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typedef unsigned long pcnt;
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#endif
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struct descr {
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char *addr;
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int low;
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unsigned int highminlow;
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unsigned int size;
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};
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static struct descr *descrs[10];
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static struct descr **ppdescr = descrs;
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char *
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new_stackptr(pdescr, a)
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register struct descr *pdescr;
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{
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pcnt size = (((pdescr->highminlow + 1) * pdescr->size +
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(EM_WSIZE - 1)) & ~(EM_WSIZE - 1));
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if (ppdescr >= &descrs[10]) {
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/* to many nested traps + handlers ! */
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TRP(M2_TOOMANY);
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}
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*ppdescr++ = pdescr;
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if ((char *) &a - (char *) &size > 0) {
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/* stack grows downwards */
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return (char *) &a - size;
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}
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else return (char *) &a + size;
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}
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copy_array(p, a)
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register char *p;
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{
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register char *q;
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register pcnt sz;
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char dummy;
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ppdescr--;
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sz = ((*ppdescr)->highminlow + 1) * (*ppdescr)->size;
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if ((char *) &a - (char *) &dummy > 0) {
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(*ppdescr)->addr = q = (char *) &a;
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}
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else (*ppdescr)->addr = q = (char *) &a -
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((sz + (EM_WSIZE - 1)) & ~ (EM_WSIZE - 1));
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while (sz--) *q++ = *p++;
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}
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