kc3-lang/libtommath/bn_mp_grow.c

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• Hash : 4534056c
  Author :
  Date : 2019-05-13T00:22:18
  

  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

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• bn_mp_grow.c

• #include "tommath_private.h"
  #ifdef BN_MP_GROW_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* grow as required */
  mp_err mp_grow(mp_int *a, int size)
  {
     int     i;
     mp_digit *tmp;
  
     /* if the alloc size is smaller alloc more ram */
     if (a->alloc < size) {
        /* reallocate the array a->dp
         *
         * We store the return in a temporary variable
         * in case the operation failed we don't want
         * to overwrite the dp member of a.
         */
        tmp = (mp_digit *) MP_REALLOC(a->dp,
                                      (size_t)a->alloc * sizeof(mp_digit),
                                      (size_t)size * sizeof(mp_digit));
        if (tmp == NULL) {
           /* reallocation failed but "a" is still valid [can be freed] */
           return MP_MEM;
        }
  
        /* reallocation succeeded so set a->dp */
        a->dp = tmp;
  
        /* zero excess digits */
        i        = a->alloc;
        a->alloc = size;
        MP_ZERO_DIGITS(a->dp + i, a->alloc - i);
     }
     return MP_OKAY;
  }
  #endif
  

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