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annotate tomsfastmath/src/bin/fp_read_radix.c @ 644:ff5cc422ba40 dropbear-tfm tomsfastmath

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Somehow Makefile.in went missing
author Matt Johnston <matt@ucc.asn.au>
date Wed, 23 Nov 2011 18:11:51 +0700
parents a362b62d38b2
children
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1 /* TomsFastMath, a fast ISO C bignum library.
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2 *
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3 * This project is meant to fill in where LibTomMath
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4 * falls short. That is speed ;-)
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5 *
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6 * This project is public domain and free for all purposes.
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7 *
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8 * Tom St Denis, [email protected]
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9 */
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10 #include <tfm.h>
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12 int fp_read_radix(fp_int *a, char *str, int radix)
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13 {
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14 int y, neg;
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15 char ch;
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17 /* make sure the radix is ok */
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18 if (radix < 2 || radix > 64) {
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19 return FP_VAL;
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20 }
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21
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22 /* if the leading digit is a
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23 * minus set the sign to negative.
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24 */
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25 if (*str == '-') {
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26 ++str;
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27 neg = FP_NEG;
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28 } else {
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29 neg = FP_ZPOS;
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30 }
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31
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32 /* set the integer to the default of zero */
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33 fp_zero (a);
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35 /* process each digit of the string */
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36 while (*str) {
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37 /* if the radix < 36 the conversion is case insensitive
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38 * this allows numbers like 1AB and 1ab to represent the same value
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39 * [e.g. in hex]
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40 */
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41 ch = (char) ((radix < 36) ? toupper ((int)*str) : *str);
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42 for (y = 0; y < 64; y++) {
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43 if (ch == fp_s_rmap[y]) {
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44 break;
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45 }
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46 }
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47
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48 /* if the char was found in the map
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49 * and is less than the given radix add it
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50 * to the number, otherwise exit the loop.
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51 */
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52 if (y < radix) {
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53 fp_mul_d (a, (fp_digit) radix, a);
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54 fp_add_d (a, (fp_digit) y, a);
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55 } else {
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56 break;
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57 }
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58 ++str;
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59 }
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60
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61 /* set the sign only if a != 0 */
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62 if (fp_iszero(a) != FP_YES) {
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63 a->sign = neg;
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64 }
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65 return FP_OKAY;
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66 }
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67
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68 /* $Source$ */
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69 /* $Revision$ */
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70 /* $Date$ */