1 #include "os.h"
2 #include <mp.h>
3 #include "dat.h"
4 
5 #define VLDIGITS (sizeof(vlong)/sizeof(mpdigit))
6 
7 /*
8  *  this code assumes that a vlong is an integral number of
9  *  mpdigits long.
10  */
11 mpint*
12 uvtomp(uvlong v, mpint *b)
13 {
14 	int s;
15 
16 	if(b == nil)
17 		b = mpnew(VLDIGITS*sizeof(mpdigit));
18 	else
19 		mpbits(b, VLDIGITS*sizeof(mpdigit));
20 	mpassign(mpzero, b);
21 	if(v == 0)
22 		return b;
23 	for(s = 0; s < VLDIGITS && v != 0; s++){
24 		b->p[s] = v;
25 		v >>= sizeof(mpdigit)*8;
26 	}
27 	b->top = s;
28 	return b;
29 }
30 
31 uvlong
32 mptouv(mpint *b)
33 {
34 	uvlong v;
35 	int s;
36 
37 	if(b->top == 0)
38 		return 0LL;
39 
40 	mpnorm(b);
41 	if(b->top > VLDIGITS)
42 		return MAXVLONG;
43 
44 	v = 0ULL;
45 	for(s = 0; s < b->top; s++)
46 		v |= b->p[s]<<(s*sizeof(mpdigit)*8);
47 
48 	return v;
49 }