bn_mp_copy.c

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Author : Daniel Mendler
Date : 2019-05-13 00:22:18
Hash : 4534056c
Message : use enums mp_err, mp_ord, mp_bool, mp_sign * MP_USE_ENUMS enables enums * Wc++-compat catches some implicit conversions if MP_USE_ENUMS is defined * 100% backwards compatible API/ABI if MP_USE_ENUMS is not defined

bn_mp_copy.c

#include "tommath_private.h"
#ifdef BN_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;
   mp_err res;

   /* if dst == src do nothing */
   if (a == b) {
      return MP_OKAY;
   }

   /* grow dest */
   if (b->alloc < a->used) {
      if ((res = mp_grow(b, a->used)) != MP_OKAY) {
         return res;
      }
   }

   /* zero b and copy the parameters over */
   {
      mp_digit *tmpa, *tmpb;

      /* pointer aliases */

      /* source */
      tmpa = a->dp;

      /* destination */
      tmpb = b->dp;

      /* copy all the digits */
      for (n = 0; n < a->used; n++) {
         *tmpb++ = *tmpa++;
      }

      /* clear high digits */
      MP_ZERO_DIGITS(tmpb, b->used - n);
   }

   /* copy used count and sign */
   b->used = a->used;
   b->sign = a->sign;
   return MP_OKAY;
}
#endif

kc3-lang/libtommath/bn_mp_copy.c

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