From b38465c6d15604c9fb807633f784a39d7046382a Mon Sep 17 00:00:00 2001
From: Reiner Herrmann <reiner@reiner-h.de>
Date: Sun, 25 Jun 2017 13:56:04 +0200
Subject: firemon: only use col/row when values are valid

In case stdin (or stdout/stderr) is not attached to a tty, the
ioctl can't determine the actual sizes, so keep using fallback values.
---
 src/firemon/top.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'src/firemon/top.c')

diff --git a/src/firemon/top.c b/src/firemon/top.c
index 55a35d93d..3a79a5260 100644
--- a/src/firemon/top.c
+++ b/src/firemon/top.c
@@ -275,8 +275,10 @@ void top(void) {
 		int row = 24;
 		int col = 80;
 		if (!ioctl(STDIN_FILENO, TIOCGWINSZ, &sz)) {
-			col = sz.ws_col;
-			row = sz.ws_row;
+			if (sz.ws_col > 0 && sz.ws_row > 0) {
+				col = sz.ws_col;
+				row = sz.ws_row;
+			}
 		}
 
 		// start printing
-- 
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