Bug 208420 - /usr/bin/less incorrectly displays long lines
Summary: /usr/bin/less incorrectly displays long lines
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: bin (show other bugs)
Version: CURRENT
Hardware: Any Any
: --- Affects Many People
Assignee: freebsd-bugs mailing list
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-03-31 14:15 UTC by Dmitry Marakasov
Modified: 2016-03-31 14:17 UTC (History)
0 users

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Description Dmitry Marakasov freebsd_committer 2016-03-31 14:15:09 UTC
less in -current is terminally broken when handling long lines.

The problem is demostrated on the video:
http://people.freebsd.org/~amdmi3/out.ogv

First, more is called, it correctly scrolls the file from top to bottom.
Less, though, displays `END' right away like the file is shorter than terminal height and does not let scroll at all. It only displays 5 last lines of the file and a part of previous line.

The problem may also be reproduced when scrolling through `pstree` output with a long of long commands running. less will skip lines and eat away long ones.
Comment 1 Dmitry Marakasov freebsd_committer 2016-03-31 14:16:04 UTC
IMO that's a blocker for 11.0-RELEASE.
Comment 2 Dmitry Marakasov freebsd_committer 2016-03-31 14:17:34 UTC
That's reproducible in FreeBSD 11.0-CURRENT #0 r295763, but was an issue in current for some time.