Line data    Source code

       1             : #include "tommath_private.h"
       2             : #ifdef BN_MP_GROW_C
       3             : /* LibTomMath, multiple-precision integer library -- Tom St Denis */
       4             : /* SPDX-License-Identifier: Unlicense */
       5             : 
       6             : /* grow as required */
       7       18963 : mp_err mp_grow(mp_int *a, int size)
       8             : {
       9             :    int     i;
      10             :    mp_digit *tmp;
      11             : 
      12             :    /* if the alloc size is smaller alloc more ram */
      13       18963 :    if (a->alloc < size) {
      14             :       /* reallocate the array a->dp
      15             :        *
      16             :        * We store the return in a temporary variable
      17             :        * in case the operation failed we don't want
      18             :        * to overwrite the dp member of a.
      19             :        */
      20       18734 :       tmp = (mp_digit *) MP_REALLOC(a->dp,
      21             :                                     (size_t)a->alloc * sizeof(mp_digit),
      22             :                                     (size_t)size * sizeof(mp_digit));
      23       18734 :       if (tmp == NULL) {
      24             :          /* reallocation failed but "a" is still valid [can be freed] */
      25           0 :          return MP_MEM;
      26             :       }
      27             : 
      28             :       /* reallocation succeeded so set a->dp */
      29       18734 :       a->dp = tmp;
      30             : 
      31             :       /* zero excess digits */
      32       18734 :       i        = a->alloc;
      33       18734 :       a->alloc = size;
      34       18734 :       MP_ZERO_DIGITS(a->dp + i, a->alloc - i);
      35             :    }
      36       18963 :    return MP_OKAY;
      37             : }
      38             : #endif