Mercurial > dropbear
annotate libtommath/bn_mp_toradix_n.c @ 1613:caa9bb54dfa0
fix #endif (#59)
author | François Perrad <francois.perrad@gadz.org> |
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date | Wed, 28 Feb 2018 15:10:14 +0100 |
parents | 8bba51a55704 |
children | f52919ffd3b1 |
rev | line source |
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1436 | 1 #include <tommath_private.h> |
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2 #ifdef BN_MP_TORADIX_N_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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4 * |
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5 * LibTomMath is a library that provides multiple-precision |
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6 * integer arithmetic as well as number theoretic functionality. |
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7 * |
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8 * The library was designed directly after the MPI library by |
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9 * Michael Fromberger but has been written from scratch with |
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10 * additional optimizations in place. |
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11 * |
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12 * The library is free for all purposes without any express |
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13 * guarantee it works. |
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14 * |
1436 | 15 * Tom St Denis, [email protected], http://libtom.org |
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16 */ |
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17 |
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18 /* stores a bignum as a ASCII string in a given radix (2..64) |
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19 * |
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20 * Stores upto maxlen-1 chars and always a NULL byte |
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21 */ |
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22 int mp_toradix_n(mp_int * a, char *str, int radix, int maxlen) |
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23 { |
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24 int res, digs; |
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25 mp_int t; |
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26 mp_digit d; |
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27 char *_s = str; |
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28 |
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29 /* check range of the maxlen, radix */ |
1436 | 30 if ((maxlen < 2) || (radix < 2) || (radix > 64)) { |
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31 return MP_VAL; |
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32 } |
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33 |
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34 /* quick out if its zero */ |
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35 if (mp_iszero(a) == MP_YES) { |
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36 *str++ = '0'; |
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37 *str = '\0'; |
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38 return MP_OKAY; |
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39 } |
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40 |
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41 if ((res = mp_init_copy (&t, a)) != MP_OKAY) { |
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42 return res; |
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43 } |
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44 |
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45 /* if it is negative output a - */ |
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46 if (t.sign == MP_NEG) { |
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47 /* we have to reverse our digits later... but not the - sign!! */ |
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48 ++_s; |
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49 |
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50 /* store the flag and mark the number as positive */ |
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51 *str++ = '-'; |
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52 t.sign = MP_ZPOS; |
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53 |
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54 /* subtract a char */ |
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55 --maxlen; |
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56 } |
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57 |
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58 digs = 0; |
1436 | 59 while (mp_iszero (&t) == MP_NO) { |
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60 if (--maxlen < 1) { |
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61 /* no more room */ |
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62 break; |
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63 } |
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64 if ((res = mp_div_d (&t, (mp_digit) radix, &t, &d)) != MP_OKAY) { |
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65 mp_clear (&t); |
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66 return res; |
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67 } |
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68 *str++ = mp_s_rmap[d]; |
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69 ++digs; |
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70 } |
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71 |
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72 /* reverse the digits of the string. In this case _s points |
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73 * to the first digit [exluding the sign] of the number |
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74 */ |
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75 bn_reverse ((unsigned char *)_s, digs); |
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76 |
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77 /* append a NULL so the string is properly terminated */ |
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78 *str = '\0'; |
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79 |
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80 mp_clear (&t); |
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81 return MP_OKAY; |
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82 } |
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83 |
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84 #endif |
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85 |
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Update to libtommath v1.0.1
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86 /* ref: $Format:%D$ */ |
8bba51a55704
Update to libtommath v1.0.1
Matt Johnston <matt@ucc.asn.au>
parents:
1436
diff
changeset
|
87 /* git commit: $Format:%H$ */ |
8bba51a55704
Update to libtommath v1.0.1
Matt Johnston <matt@ucc.asn.au>
parents:
1436
diff
changeset
|
88 /* commit time: $Format:%ai$ */ |