mp_cmp_d.c

   1 #include "tommath_private.h"
   2 #ifdef MP_CMP_D_C
   3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
   4 /* SPDX-License-Identifier: Unlicense */
   5
   6 /* compare a digit */
   7 mp_ord mp_cmp_d(const mp_int *a, mp_digit b)
   8 {
   9    /* compare based on sign */
  10    if (mp_isneg(a)) {
  11       return MP_LT;
  12    }
  13
  14    /* compare based on magnitude */
  15    if (a->used > 1) {
  16       return MP_GT;
  17    }
  18
  19    /* compare the only digit of a to b */
  20    if (a->dp[0] != b) {
  21       return a->dp[0] > b ? MP_GT : MP_LT;
  22    }
  23
  24    return MP_EQ;
  25 }
  26 #endif