48 lines
866 B
C
48 lines
866 B
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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uint32_t
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jehanne_umuldiv(uint32_t a, uint32_t b, uint32_t c)
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{
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double d;
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d = ((double)a * (double)b) / (double)c;
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if(d >= 4294967296.)
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abort();
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return d;
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}
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int32_t
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jehanne_muldiv(int32_t a, int32_t b, int32_t c)
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{
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int s;
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int32_t v;
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s = 0;
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if(a < 0) {
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s = !s;
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a = -a;
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}
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if(b < 0) {
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s = !s;
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b = -b;
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}
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if(c < 0) {
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s = !s;
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c = -c;
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}
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v = jehanne_umuldiv(a, b, c);
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if(s)
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v = -v;
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return v;
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}
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