1 files changed, 7 insertions, 0 deletions
diff --git a/kern/cbuf.h b/kern/cbuf.h
index 0558cc09..a30e5f28 100644
--- a/kern/cbuf.h
+++ b/kern/cbuf.h
@@ -21,6 +21,7 @@
 #ifndef _KERN_CBUF_H
 #define _KERN_CBUF_H
 
+#include <stdbool.h>
 #include <stddef.h>
 
 /*
@@ -66,6 +67,12 @@ cbuf_clear(struct cbuf *cbuf)
     cbuf->start = cbuf->end;
 }
 
+static inline bool
+cbuf_range_valid(const struct cbuf *cbuf, size_t start, size_t end)
+{
+    return ((end - start) <= cbuf_size(cbuf));
+}
+
 /*
  * Initialize a circular buffer.
  *