1#include <tommath.h>
2#ifdef BN_MP_COPY_C
3/* LibTomMath, multiple-precision integer library -- Tom St Denis
4 *
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
7 *
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
11 *
12 * The library is free for all purposes without any express
13 * guarantee it works.
14 *
15 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
16 */
17
18/* copy, b = a */
19int
20mp_copy (mp_int * a, mp_int * b)
21{
22  int     res, n;
23
24  /* if dst == src do nothing */
25  if (a == b) {
26    return MP_OKAY;
27  }
28
29  /* grow dest */
30  if (b->alloc < a->used) {
31     if ((res = mp_grow (b, a->used)) != MP_OKAY) {
32        return res;
33     }
34  }
35
36  /* zero b and copy the parameters over */
37  {
38    register mp_digit *tmpa, *tmpb;
39
40    /* pointer aliases */
41
42    /* source */
43    tmpa = a->dp;
44
45    /* destination */
46    tmpb = b->dp;
47
48    /* copy all the digits */
49    for (n = 0; n < a->used; n++) {
50      *tmpb++ = *tmpa++;
51    }
52
53    /* clear high digits */
54    for (; n < b->used; n++) {
55      *tmpb++ = 0;
56    }
57  }
58
59  /* copy used count and sign */
60  b->used = a->used;
61  b->sign = a->sign;
62  return MP_OKAY;
63}
64#endif
65
66/* $Source$ */
67/* $Revision$ */
68/* $Date$ */
69