From bf4418b4bb9166a6a27937b53710d2b4d30925af Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Wed, 21 Mar 2018 17:51:39 +0100
Subject: kernel: Fix os_SUITE:max_size_command for OTP-19

where string:trim does not exist.
---
 lib/kernel/test/os_SUITE.erl | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/kernel/test/os_SUITE.erl b/lib/kernel/test/os_SUITE.erl
index cfd475becf..d7f0463289 100644
--- a/lib/kernel/test/os_SUITE.erl
+++ b/lib/kernel/test/os_SUITE.erl
@@ -324,9 +324,17 @@ max_size_command(_Config) ->
     Res32768 = os:cmd("cat /dev/zero", #{ max_size => 32768 }),
     32768 = length(Res32768),
 
-    ResHello = string:trim(os:cmd("echo hello", #{ max_size => 20 })),
+    ResHello = string_trim(os:cmd("echo hello", #{ max_size => 20 })),
     5 = length(ResHello).
 
+string_trim(S) ->
+    lists:reverse(string_trim_left(lists:reverse(string_trim_left(S)))).
+
+string_trim_left([C | T]) when C =:= $\s; C =:= $\n; C =:= $\t; C =:= $\r ->
+    string_trim_left(T);
+string_trim_left(S) ->
+    S.
+
 %% Test that the os:perf_counter api works as expected
 perf_counter_api(_Config) ->
 
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