commit b05a404604b30ad9423fd48120dc2570d4e13027
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 b234924af3e613563a0e42e71302c533f291fe5c

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;
 }