Mercurial > dropbear
annotate libtommath/bn_mp_toradix.c @ 1684:d5d25ce2a2ed
cast to fix warning
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 26 May 2020 19:57:28 +0800 |
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_TORADIX_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 * SPDX-License-Identifier: Unlicense |
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13 */ |
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14 |
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15 /* stores a bignum as a ASCII string in a given radix (2..64) */ |
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16 int mp_toradix(const mp_int *a, char *str, int radix) |
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17 { |
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18 int res, digs; |
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19 mp_int t; |
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20 mp_digit d; |
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21 char *_s = str; |
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22 |
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23 /* check range of the radix */ |
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24 if ((radix < 2) || (radix > 64)) { |
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25 return MP_VAL; |
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26 } |
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27 |
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28 /* quick out if its zero */ |
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29 if (mp_iszero(a) == MP_YES) { |
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30 *str++ = '0'; |
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31 *str = '\0'; |
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32 return MP_OKAY; |
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33 } |
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34 |
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35 if ((res = mp_init_copy(&t, a)) != MP_OKAY) { |
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36 return res; |
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37 } |
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38 |
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39 /* if it is negative output a - */ |
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40 if (t.sign == MP_NEG) { |
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41 ++_s; |
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42 *str++ = '-'; |
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43 t.sign = MP_ZPOS; |
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44 } |
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45 |
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46 digs = 0; |
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47 while (mp_iszero(&t) == MP_NO) { |
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48 if ((res = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) { |
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49 mp_clear(&t); |
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50 return res; |
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51 } |
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52 *str++ = mp_s_rmap[d]; |
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53 ++digs; |
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54 } |
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55 |
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56 /* reverse the digits of the string. In this case _s points |
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57 * to the first digit [exluding the sign] of the number] |
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58 */ |
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59 bn_reverse((unsigned char *)_s, digs); |
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60 |
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61 /* append a NULL so the string is properly terminated */ |
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62 *str = '\0'; |
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63 |
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64 mp_clear(&t); |
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65 return MP_OKAY; |
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66 } |
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67 |
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68 #endif |
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69 |
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70 /* ref: HEAD -> master, tag: v1.1.0 */ |
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71 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
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72 /* commit time: 2019-01-28 20:32:32 +0100 */ |