1 files changed, 51 insertions, 0 deletions
diff --git a/lib/minitasn1/version.c b/lib/minitasn1/version.c
new file mode 100644
index 0000000..83e69d8
--- /dev/null
+++ b/lib/minitasn1/version.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2000-2021 Free Software Foundation, Inc.
+ *
+ * This file is part of LIBTASN1.
+ *
+ * The LIBTASN1 library is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>		/* for strverscmp */
+
+#include "libtasn1.h"
+
+/**
+ * asn1_check_version:
+ * @req_version: Required version number, or %NULL.
+ *
+ * Check that the version of the library is at minimum the
+ * requested one and return the version string; return %NULL if the
+ * condition is not satisfied.  If a %NULL is passed to this function,
+ * no check is done, but the version string is simply returned.
+ *
+ * See %ASN1_VERSION for a suitable @req_version string.
+ *
+ * Returns: Version string of run-time library, or %NULL if the
+ *   run-time library does not meet the required version number.
+ */
+const char *
+asn1_check_version (const char *req_version)
+{
+  if (!req_version || strverscmp (req_version, ASN1_VERSION) <= 0)
+    return ASN1_VERSION;
+
+  return NULL;
+}