50 lines
727 B
C
50 lines
727 B
C
#include "os.h"
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#include <mp.h>
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#include "dat.h"
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#define VLDIGITS (sizeof(vlong)/sizeof(mpdigit))
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/*
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* this code assumes that a vlong is an integral number of
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* mpdigits long.
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*/
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mpint*
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uvtomp(uvlong v, mpint *b)
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{
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int s;
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if(b == nil)
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b = mpnew(VLDIGITS*sizeof(mpdigit));
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else
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mpbits(b, VLDIGITS*sizeof(mpdigit));
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mpassign(mpzero, b);
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if(v == 0)
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return b;
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for(s = 0; s < VLDIGITS && v != 0; s++){
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b->p[s] = v;
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v >>= sizeof(mpdigit)*8;
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}
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b->top = s;
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return b;
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}
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uvlong
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mptouv(mpint *b)
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{
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uvlong v;
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int s;
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if(b->top == 0)
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return (vlong) 0;
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mpnorm(b);
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if(b->top > VLDIGITS)
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return MAXVLONG;
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v = (uvlong) 0;
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for(s = 0; s < b->top; s++)
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v |= b->p[s]<<(s*sizeof(mpdigit)*8);
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return v;
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}
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