Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From ccfc4c1ab41826b4bac99e53a844ca244fcfb330 Mon Sep 17 00:00:00 2001
|From: Arif Roktim <aroktim@stuy.edu>
|Date: Wed, 25 Apr 2018 21:27:59 -0400
|Subject: [PATCH] Lock input but don't lock screen
|
|This patch keeps the screen unlocked but keeps the input locked. 
|That is, the screen is not affected by slock, but users will not
|be able to interact with the X session unless they enter the correct password.
|
|There's a lot of extraneous code that can be removed since the goal is
|for input to be locked while at the same time allowing the screen to be
|updated and viewable. But this patch just works (tm) and I don't want to
|potentially introduce bugs.
|---
| slock.c | 3 +--
| 1 file changed, 1 insertion(+), 2 deletions(-)
|
|diff --git a/slock.c b/slock.c
|index d2f0886..98f5d80 100644
|--- a/slock.c
|+++ b/slock.c
--------------------------
Patching file slock.c using Plan A...
Hunk #1 succeeded at 254.
Hunk #2 succeeded at 263.
Hmm...  Ignoring the trailing garbage.
done