kc3-lang/libtommath/mp_copy.c

• Show log

  Commit

• Hash : 7a68f128
  Author :
  Date : 2019-10-19T16:24:39
  

  Execute move.sh - Rename files from bn_* to match the function names. * git blame <renamed-file> is not affected * git log --follow <renamed-file> can be used to show log across renames

Download

• 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;
     mp_digit *tmpa, *tmpb;
     mp_err err;
  
     /* if dst == src do nothing */
     if (a == b) {
        return MP_OKAY;
     }
  
     /* grow dest */
     if (b->alloc < a->used) {
        if ((err = mp_grow(b, a->used)) != MP_OKAY) {
           return err;
        }
     }
  
     /* zero b and copy the parameters over */
     /* 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
  

Download