--- /dev/null
+<!--
+SPDX-FileCopyrightText: 2010 Pierre-Marc Fournier <pierre-marc.fournier@polymtl.ca>
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
+This is a signal safe version of snprintf/vsnprintf. The code is
+originally from the OpenBSD libc.