From 047be9a36e8b2243d0b06a722df72dc3fbc97bf5 Mon Sep 17 00:00:00 2001
From: Gavin Howard <yzena.tech@gmail.com>
Date: Mon, 10 Jun 2019 19:52:37 -0600
Subject: bc: fix a bug in power

This bug is that an error should be returned when the user tries to take
0 to a negative power, since that is undefined, but bc would return 0.
---
 toys/pending/bc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/toys/pending/bc.c b/toys/pending/bc.c
index bb5d86cb..b38d9872 100644
--- a/toys/pending/bc.c
+++ b/toys/pending/bc.c
@@ -1717,6 +1717,7 @@ static BcStatus bc_num_p(BcNum *a, BcNum *b, BcNum *c, size_t scale) {
   if (b->rdx) return bc_vm_err(BC_ERROR_MATH_NON_INTEGER);
 
   if (!b->len) {
+    if (b->neg) return bc_vm_err(BC_ERROR_MATH_DIVIDE_BY_ZERO);
     bc_num_one(c);
     return BC_STATUS_SUCCESS;
   }
-- 
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