denyhosts/clamscan/libclamav/tomsfastmath/bin/fp_toradix.c

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2022-10-22 18:41:00 +08:00
/* TomsFastMath, a fast ISO C bignum library.
*
* This project is meant to fill in where LibTomMath
* falls short. That is speed ;-)
*
* This project is public domain and free for all purposes.
*
* Tom St Denis, tomstdenis@gmail.com
*/
#include "bignum_fast.h"
int fp_toradix(fp_int *a, char *str, int radix)
{
int digs;
fp_int t;
fp_digit d;
char *_s = str;
/* check range of the radix */
if (radix < 2 || radix > 64) {
return FP_VAL;
}
/* quick out if its zero */
if (fp_iszero(a) == 1) {
*str++ = '0';
*str = '\0';
return FP_OKAY;
}
fp_init_copy(&t, a);
/* if it is negative output a - */
if (t.sign == FP_NEG) {
++_s;
*str++ = '-';
t.sign = FP_ZPOS;
}
digs = 0;
while (fp_iszero (&t) == FP_NO) {
fp_div_d (&t, (fp_digit) radix, &t, &d);
*str++ = fp_s_rmap[d];
++digs;
}
/* reverse the digits of the string. In this case _s points
* to the first digit [exluding the sign] of the number]
*/
fp_reverse ((unsigned char *)_s, digs);
/* append a NULL so the string is properly terminated */
*str = '\0';
return FP_OKAY;
}
/* $Source: /cvs/libtom/tomsfastmath/src/bin/fp_toradix.c,v $ */
/* $Revision: 1.2 $ */
/* $Date: 2007/02/27 02:38:44 $ */