1/*	$NetBSD$	*/
2
3#include <tommath.h>
4#ifdef BN_MP_FREAD_C
5/* LibTomMath, multiple-precision integer library -- Tom St Denis
6 *
7 * LibTomMath is a library that provides multiple-precision
8 * integer arithmetic as well as number theoretic functionality.
9 *
10 * The library was designed directly after the MPI library by
11 * Michael Fromberger but has been written from scratch with
12 * additional optimizations in place.
13 *
14 * The library is free for all purposes without any express
15 * guarantee it works.
16 *
17 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
18 */
19
20/* read a bigint from a file stream in ASCII */
21int mp_fread(mp_int *a, int radix, FILE *stream)
22{
23   int err, ch, neg, y;
24
25   /* clear a */
26   mp_zero(a);
27
28   /* if first digit is - then set negative */
29   ch = fgetc(stream);
30   if (ch == '-') {
31      neg = MP_NEG;
32      ch = fgetc(stream);
33   } else {
34      neg = MP_ZPOS;
35   }
36
37   for (;;) {
38      /* find y in the radix map */
39      for (y = 0; y < radix; y++) {
40          if (mp_s_rmap[y] == ch) {
41             break;
42          }
43      }
44      if (y == radix) {
45         break;
46      }
47
48      /* shift up and add */
49      if ((err = mp_mul_d(a, radix, a)) != MP_OKAY) {
50         return err;
51      }
52      if ((err = mp_add_d(a, y, a)) != MP_OKAY) {
53         return err;
54      }
55
56      ch = fgetc(stream);
57   }
58   if (mp_cmp_d(a, 0) != MP_EQ) {
59      a->sign = neg;
60   }
61
62   return MP_OKAY;
63}
64
65#endif
66
67/* Source: /cvs/libtom/libtommath/bn_mp_fread.c,v */
68/* Revision: 1.4 */
69/* Date: 2006/12/28 01:25:13 */
70