Mercurial > dropbear
view libtommath/bn_mp_read_radix.c @ 865:39d872718d4b
Try and fix utmp handling
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Mon, 25 Nov 2013 23:30:01 +0800 |
parents | 5ff8218bcee9 |
children | 60fc6476e044 |
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#include <tommath.h> #ifdef BN_MP_READ_RADIX_C /* LibTomMath, multiple-precision integer library -- Tom St Denis * * LibTomMath is a library that provides multiple-precision * integer arithmetic as well as number theoretic functionality. * * The library was designed directly after the MPI library by * Michael Fromberger but has been written from scratch with * additional optimizations in place. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, [email protected], http://math.libtomcrypt.com */ /* read a string [ASCII] in a given radix */ int mp_read_radix (mp_int * a, const char *str, int radix) { int y, res, neg; char ch; /* zero the digit bignum */ mp_zero(a); /* make sure the radix is ok */ if (radix < 2 || radix > 64) { return MP_VAL; } /* if the leading digit is a * minus set the sign to negative. */ if (*str == '-') { ++str; neg = MP_NEG; } else { neg = MP_ZPOS; } /* set the integer to the default of zero */ mp_zero (a); /* process each digit of the string */ while (*str) { /* if the radix < 36 the conversion is case insensitive * this allows numbers like 1AB and 1ab to represent the same value * [e.g. in hex] */ ch = (char) ((radix < 36) ? toupper (*str) : *str); for (y = 0; y < 64; y++) { if (ch == mp_s_rmap[y]) { break; } } /* if the char was found in the map * and is less than the given radix add it * to the number, otherwise exit the loop. */ if (y < radix) { if ((res = mp_mul_d (a, (mp_digit) radix, a)) != MP_OKAY) { return res; } if ((res = mp_add_d (a, (mp_digit) y, a)) != MP_OKAY) { return res; } } else { break; } ++str; } /* set the sign only if a != 0 */ if (mp_iszero(a) != 1) { a->sign = neg; } return MP_OKAY; } #endif /* $Source: /cvs/libtom/libtommath/bn_mp_read_radix.c,v $ */ /* $Revision: 1.4 $ */ /* $Date: 2006/03/31 14:18:44 $ */