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bigint.c (mrb_bint_powm): check zero division first.

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Yukihiro "Matz" Matsumoto
2022-08-26 12:10:22 +09:00
parent 818ca413af
commit ef1974099d
1 changed files with 4 additions and 1 deletions
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mrbgems/mruby-bigint/core/bigint.c
+4 -1
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@@ -1380,8 +1380,10 @@ mrb_bint_powm(mrb_state *mrb, mrb_value x, mrb_int exp, mrb_value mod)
switch (mrb_type(mod)) {
case MRB_TT_INTEGER:
{
mrb_int m = mrb_integer(mod);
if (m == 0) mrb_int_zerodiv(mrb);
struct RBigint *b2 = bint_new(mrb);
struct RBigint *b3 = bint_new_int(mrb, mrb_integer(mod));
struct RBigint *b3 = bint_new_int(mrb, m);
mpz_powm(mrb, &b2->mp, &b->mp, exp, &b3->mp);
return mrb_obj_value(b3);
}
@@ -1389,6 +1391,7 @@ mrb_bint_powm(mrb_state *mrb, mrb_value x, mrb_int exp, mrb_value mod)
{
struct RBigint *b2 = bint_new(mrb);
struct RBigint *b3 = RBIGINT(mod);
if (uzero(&b3->mp)) mrb_int_zerodiv(mrb);
mpz_powm(mrb, &b2->mp, &b->mp, exp, &b3->mp);
return bint_norm(mrb, b3);
}