From e6beaea9003be2fabd5de898d30f5f7c876e2534 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Tue, 3 May 2022 21:54:22 -0700
Subject: Don't retrace if there are no lines to draw.

In this case, things go funny because the ANSI escape
sequence ^[[0A will still go up one line, in spite
of the zero.
---
 pw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'pw.c')

diff --git a/pw.c b/pw.c
index 5d5c5b9..6538cbd 100644
--- a/pw.c
+++ b/pw.c
@@ -446,7 +446,7 @@ static unsigned redraw(char **circbuf, int nlines, unsigned hpos, unsigned hist,
   if ((stat & stat_bkgnd))
     return stat;
 
-  if (updln) {
+  if (updln && snaplines[hist] > 0) {
     printf("\r\033[%dA", snaplines[hist]);
     if ((stat & stat_lino) == 0) {
       for (int i = 0; i < snaplines[hist]; i++)
-- 
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