scroll

commit 66f97243ff888b8cdcd69b57d3abdaf58a070ec9
parent 4ed0bd4aa3382ec3b73693b4379cfa8cc91e0e7e
Author: Jochen Sprickerhof <git@jochen.sprickerhof.de>
Date:   Sun, 12 Apr 2020 22:53:03 +0200

Simplify window fraction logic

Diffstat:
M
scroll.c
 | 
8
++++----

1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/scroll.c b/scroll.c
@@ -296,8 +296,8 @@ scrollup(int n)
 	int rows = 2;
 	struct line *scrollend = bottom;
 
-	if (n < 0)
-		n = ws.ws_row / (-n) > 0 ? ws.ws_row / (-n) : 1;
+	if (n < 0) /* scroll by fraction of window rows, but at least one line */
+		n = ws.ws_row > (-n) ? ws.ws_row / (-n) : 1;
 
 	/* wind back scrollend pointer by one page plus n */
 	for (; scrollend != NULL && TAILQ_NEXT(scrollend, entries) != NULL &&
@@ -338,8 +338,8 @@ scrolldown(char *buf, size_t size, int n)
 	if (bottom == NULL || bottom == TAILQ_FIRST(&head))
 		return;
 
-	if (n < 0)
-		n = ws.ws_row / (-n) > 0 ? ws.ws_row / (-n) : 1;
+	if (n < 0) /* scroll by fraction of window rows, but at least one line */
+		n = ws.ws_row > (-n) ? ws.ws_row / (-n) : 1;
 
 	bottom = TAILQ_PREV(bottom, tailhead, entries);
 	/* print n lines */