[src/trunk]: src/lib/libedit Add a comment explaining why we don't use DO her...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b669356e3468
branches:  trunk
changeset: 452368:b669356e3468
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Jun 30 13:30:15 2019 +0000

description:
Add a comment explaining why we don't use DO here. Correct the attribution
on the previous patch: The patch was from Jordan Lewis and the report from
Raphael Poss.

diffstat:

 lib/libedit/terminal.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r f24454ef8091 -r b669356e3468 lib/libedit/terminal.c
--- a/lib/libedit/terminal.c    Sun Jun 30 11:38:16 2019 +0000
+++ b/lib/libedit/terminal.c    Sun Jun 30 13:30:15 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: terminal.c,v 1.37 2019/06/29 21:35:09 christos Exp $   */
+/*     $NetBSD: terminal.c,v 1.38 2019/06/30 13:30:15 christos Exp $   */
 
 /*-
  * Copyright (c) 1992, 1993
@@ -37,7 +37,7 @@
 #if 0
 static char sccsid[] = "@(#)term.c     8.2 (Berkeley) 4/30/95";
 #else
-__RCSID("$NetBSD: terminal.c,v 1.37 2019/06/29 21:35:09 christos Exp $");
+__RCSID("$NetBSD: terminal.c,v 1.38 2019/06/30 13:30:15 christos Exp $");
 #endif
 #endif /* not lint && not SCCSID */
 
@@ -509,6 +509,10 @@
                return;
        }
        if ((del = where - el->el_cursor.v) > 0) {
+               /*
+                * We don't use DO here because some terminals are buggy
+                * if the destination is beyond bottom of the screen.
+                */
                for (; del > 0; del--)
                        terminal__putc(el, '\n');
                /* because the \n will become \r\n */