jvs/jvs-bus.c: Add JVS bus definitions

jvs/jvs-bus.c

@@ -0,0 +1,30 @@
+#include <assert.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+#include "jvs/jvs-bus.h"
+
+void jvs_bus_transact(
+        struct jvs_node *head,
+        const void *bytes,
+        size_t nbytes,
+        struct iobuf *resp)
+{
+    struct jvs_node *node;
+
+    assert(bytes != NULL);
+    assert(resp != NULL);
+
+    for (node = head ; node != NULL ; node = node->next) {
+        node->transact(node, bytes, nbytes, resp);
+    }
+}
+
+bool jvs_node_sense(struct jvs_node *node)
+{
+    if (node != NULL) {
+        return node->sense(node);
+    } else {
+        return false;
+    }
+}