kc3-lang/libtommath/mp_clamp.c

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• Hash : 1cc289d2
  Author :
  Date : 2019-11-09T20:23:03
  

  better use of mp_isneg() and mp_iszero()

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• mp_clamp.c

• #include "tommath_private.h"
  #ifdef MP_CLAMP_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* trim unused digits
   *
   * This is used to ensure that leading zero digits are
   * trimed and the leading "used" digit will be non-zero
   * Typically very fast.  Also fixes the sign if there
   * are no more leading digits
   */
  void mp_clamp(mp_int *a)
  {
     /* decrease used while the most significant digit is
      * zero.
      */
     while ((a->used > 0) && (a->dp[a->used - 1] == 0u)) {
        --(a->used);
     }
  
     /* reset the sign flag if zero */
     if (mp_iszero(a)) {
        a->sign = MP_ZPOS;
     }
  }
  #endif
  

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