Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up b/dwm.c a/dwm.c
|--- b/dwm.c	2020-07-05 16:05:02.555947738 -0300
|+++ a/dwm.c	2020-07-05 16:06:19.592609932 -0300
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 49.
Hunk #2 succeeded at 148.
Hunk #3 succeeded at 186.
Hunk #4 succeeded at 409.
Hunk #5 succeeded at 1087.
Hunk #6 succeeded at 1217.
Hunk #7 succeeded at 1452.
Hunk #8 succeeded at 1935.
done