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* guarantee it works.
*
* Tom St Denis, tstdenis82@gmail.com, http://libtom.org
*/
/* copy, b = a */
int
mp_copy (const mp_int * a, mp_int * b)
mp_copy(const mp_int *a, mp_int *b)
{
int res, n;
int res, n;
/* if dst == src do nothing */
if (a == b) {
return MP_OKAY;
}
/* if dst == src do nothing */
if (a == b) {
return MP_OKAY;
}
/* grow dest */
if (b->alloc < a->used) {
if ((res = mp_grow (b, a->used)) != MP_OKAY) {
return res;
}
}
/* grow dest */
if (b->alloc < a->used) {
if ((res = mp_grow(b, a->used)) != MP_OKAY) {
return res;
}
}
/* zero b and copy the parameters over */
{
mp_digit *tmpa, *tmpb;
/* zero b and copy the parameters over */
{
mp_digit *tmpa, *tmpb;
/* pointer aliases */
/* pointer aliases */
/* source */
tmpa = a->dp;
/* source */
tmpa = a->dp;
/* destination */
tmpb = b->dp;
/* destination */
tmpb = b->dp;
/* copy all the digits */
for (n = 0; n < a->used; n++) {
*tmpb++ = *tmpa++;
}
/* copy all the digits */
for (n = 0; n < a->used; n++) {
*tmpb++ = *tmpa++;
}
/* clear high digits */
for (; n < b->used; n++) {
*tmpb++ = 0;
}
}
/* clear high digits */
for (; n < b->used; n++) {
*tmpb++ = 0;
}
}
/* copy used count and sign */
b->used = a->used;
b->sign = a->sign;
return MP_OKAY;
/* copy used count and sign */
b->used = a->used;
b->sign = a->sign;
return MP_OKAY;
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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