bn_mp_decr.c

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Author : Daniel Mendler
Date : 2019-04-07 15:29:11
Hash : ff561404
Message : shorter headers

bn_mp_decr.c

#include "tommath_private.h"
#ifdef BN_MP_DECR_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */

/* Decrement "a" by one like "a--". Changes input! */
int mp_decr(mp_int *a)
{
   int e = MP_OKAY;
   if (IS_ZERO(a)) {
      mp_set(a,1uL);
      a->sign = MP_NEG;
      return MP_OKAY;
   } else if (a->sign == MP_NEG) {
      a->sign = MP_ZPOS;
      if ((e = mp_incr(a)) != MP_OKAY) {
         return e;
      }
      /* There is no -0 in LTM */
      if (!IS_ZERO(a)) {
         a->sign = MP_NEG;
      }
      return MP_OKAY;
   } else if (a->dp[0] > 1uL) {
      a->dp[0]--;
      if (a->dp[0] == 0) {
         mp_zero(a);
      }
      return MP_OKAY;
   }
   return mp_sub_d(a, 1uL,a);
}
#endif

kc3-lang/libtommath/bn_mp_decr.c

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