commit 69b9b36c114680c87251ab0f140fd5d6b61e1fa9
author Wei Wang <wvw@google.com> Mon Nov 14 20:05:21 2016 -0800
committer Wei Wang <wvw@google.com> Mon Nov 14 20:20:48 2016 -0800
tree 5b8a5c1832d2d6a767298aaa54ac7baf4f261164
parent 557359863c0d1fcda9a85e3b7fb275cb12a3eb70

init: fix BuildTriggersString for empty string

behavior is undefined if pop_back() on empty std::string

Test: grep init log
Bug: 32712851
Bug: 32838381
Change-Id: I5bfac2fb275036abd0158b78df14019d2e82716d

init/action.cpp

diff --git a/init/action.cpp b/init/action.cpp
index a12f225..e9b2a0d 100644
--- a/init/action.cpp
+++ b/init/action.cpp
@@ -249,7 +249,9 @@
         result += event_trigger_;
         result += ' ';
     }
-    result.pop_back();
+    if (!result.empty()) {
+        result.pop_back();
+    }
     return result;
 }