1 files changed, 10 insertions, 0 deletions
diff --git a/util.c b/util.c
index 1229f2c..63511a3 100644
--- a/util.c
+++ b/util.c
@@ -1,3 +1,4 @@
+#include <assert.h>
 #include <errno.h>
 #include <stdarg.h>
 #include <stdint.h>
@@ -116,6 +117,15 @@ arrayaddbuf(struct array *a, const void *src, size_t n)
 	memcpy(arrayadd(a, n), src, n);
 }
 
+void *
+arraylast(struct array *a, size_t n)
+{
+	if (a->len == 0)
+		return NULL;
+	assert(n <= a->len);
+	return (char *)a->val + a->len - n;
+}
+
 void
 listinsert(struct list *list, struct list *new)
 {