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