kc3-lang/libtommath/mp_copy.c

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• Hash : 3cdcec43
  Author :
  Date : 2019-10-29T18:41:25
  

  first batch of simplifications

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• mp_copy.c

• #include "tommath_private.h"
  #ifdef MP_COPY_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* copy, b = a */
  mp_err mp_copy(const mp_int *a, mp_int *b)
  {
     int n;
  
     /* if dst == src do nothing */
     if (a == b) {
        return MP_OKAY;
     }
  
     /* grow dest */
     if (b->alloc < a->used) {
        mp_err err;
        if ((err = mp_grow(b, a->used)) != MP_OKAY) {
           return err;
        }
     }
  
     /* zero b and copy the parameters over */
  
     /* copy all the digits */
     for (n = 0; n < a->used; n++) {
        b->dp[n] = a->dp[n];
     }
  
     /* clear high digits */
     MP_ZERO_DIGITS(b->dp + a->used, b->used - a->used);
  
     /* copy used count and sign */
     b->used = a->used;
     b->sign = a->sign;
     return MP_OKAY;
  }
  #endif
  

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