1 files changed, 5 insertions, 0 deletions
diff --git a/sys/libn/bufio.c b/sys/libn/bufio.c
index 9bca46a..0a3c419 100644
--- a/sys/libn/bufio.c
+++ b/sys/libn/bufio.c
@@ -53,6 +53,11 @@ refill(io·Buffer *buf)
     buf->pos = buf->beg;
     buf->end = buf->pos + n;
 
+    // TEST: put a physical EOF byte at the end
+    // this would allow for an unget operation
+    if (n < buf->size)
+        *buf->end++ =  EOF;
+
     return n;
 }