67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
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/*
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* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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*
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* This product is part of the Amsterdam Compiler Kit.
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*
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* Permission to use, sell, duplicate or disclose this software must be
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* obtained in writing. Requests for such permissions may be sent to
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*
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* Dr. Andrew S. Tanenbaum
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* Wiskundig Seminarium
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* Vrije Universiteit
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* Postbox 7161
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* 1007 MC Amsterdam
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* The Netherlands
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*
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*/
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/* Author: J.W. Stevenson */
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extern _sav();
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extern _rst();
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#define assert() /* nothing */
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#define UNDEF 0x8000
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struct adm {
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struct adm *next;
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int size;
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};
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struct adm *_lastp = 0;
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struct adm *_highp = 0;
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_new(n,pp) int n; struct adm **pp; {
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struct adm *p,*q;
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n = ((n+sizeof(*p)-1) / sizeof(*p)) * sizeof(*p);
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if ((p = _lastp) != 0)
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do {
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q = p->next;
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if (q->size >= n) {
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assert(q->size%sizeof(adm) == 0);
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if ((q->size -= n) == 0) {
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if (p == q)
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p = 0;
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else
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p->next = q->next;
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if (q == _highp)
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_highp = p;
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}
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_lastp = p;
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p = (struct adm *)((char *)q + q->size);
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q = (struct adm *)((char *)p + n);
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goto initialize;
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}
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p = q;
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} while (p != _lastp);
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/*no free block big enough*/
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_sav(&p);
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q = (struct adm *)((char *)p + n);
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_rst(&q);
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initialize:
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*pp = p;
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while (p < q)
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*((int *)p)++ = UNDEF;
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}
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