mp_shrink.c

   1 #include "tommath_private.h"
   2 #ifdef MP_SHRINK_C
   3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
   4 /* SPDX-License-Identifier: Unlicense */
   5
   6 /* shrink a bignum */
   7 mp_err mp_shrink(mp_int *a)
   8 {
   9    int alloc = MP_MAX(MP_MIN_DIGIT_COUNT, a->used);
  10    if (a->alloc != alloc) {
  11       mp_digit *dp = (mp_digit *) MP_REALLOC(a->dp,
  12                                              (size_t)a->alloc * sizeof(mp_digit),
  13                                              (size_t)alloc * sizeof(mp_digit));
  14       if (dp == NULL) {
  15          return MP_MEM;
  16       }
  17       a->dp    = dp;
  18       a->alloc = alloc;
  19    }
  20    return MP_OKAY;
  21 }
  22 #endif