From 73c04db73163d1d2719bb97a6b8c133065df75c3 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Mon, 18 May 2020 18:22:42 -0700
Subject: feat: macro expansion and constant evaluation prototype

---
 sys/libn/bufio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'sys/libn/bufio.c')

diff --git a/sys/libn/bufio.c b/sys/libn/bufio.c
index 05b6068..cde56b7 100644
--- a/sys/libn/bufio.c
+++ b/sys/libn/bufio.c
@@ -75,8 +75,8 @@ getbyte:
 error
 bufio·ungetbyte(io·Buffer *buf, byte c)
 {
-    buf->state ^= bufio·end;
-    if (buf->state & bufio·rdr) {
+    buf->state &= ~bufio·end;
+    if (!(buf->state & bufio·rdr)) {
         errorf("attempted to unget on non-active reader");
         return bufio·err;
     }
-- 
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