release/src/router/dropbear/libtommath/bn_mp_cmp_d.c

   1 #include <tommath.h>
   2 #ifdef BN_MP_CMP_D_C
   3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
   4  *
   5  * LibTomMath is a library that provides multiple-precision
   6  * integer arithmetic as well as number theoretic functionality.
   7  *
   8  * The library was designed directly after the MPI library by
   9  * Michael Fromberger but has been written from scratch with
  10  * additional optimizations in place.
  11  *
  12  * The library is free for all purposes without any express
  13  * guarantee it works.
  14  *
  15  * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
  16  */
  17
  18 /* compare a digit */
  19 int mp_cmp_d(mp_int * a, mp_digit b)
  20 {
  21   /* compare based on sign */
  22   if (a->sign == MP_NEG) {
  23     return MP_LT;
  24   }
  25
  26   /* compare based on magnitude */
  27   if (a->used > 1) {
  28     return MP_GT;
  29   }
  30
  31   /* compare the only digit of a to b */
  32   if (a->dp[0] > b) {
  33     return MP_GT;
  34   } else if (a->dp[0] < b) {
  35     return MP_LT;
  36   } else {
  37     return MP_EQ;
  38   }
  39 }
  40 #endif
  41
  42 /* $Source: /cvs/libtom/libtommath/bn_mp_cmp_d.c,v $ */
  43 /* $Revision: 1.3 $ */
  44 /* $Date: 2006/03/31 14:18:44 $ */