can-j1939: add libj1939

libj1939 provides a parser for struct sockaddr_can with j1939 info

Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

libj1939.h

@@ -0,0 +1,19 @@
+#include <sys/socket.h>
+#include <linux/can.h>
+#include <linux/can/j1939.h>
+
+#ifndef J1939_LIB_H
+#define J1939_LIB_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int libj1939_str2addr(const char *str, char **endp, struct sockaddr_can *can);
+extern const char *libj1939_addr2str(const struct sockaddr_can *can);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif