+#ifndef CCAN_ASORT_H
+#define CCAN_ASORT_H
+#include <ccan/typesafe_cb/typesafe_cb.h>
+#include <stdlib.h>
+
+/**
+ * asort - sort an array of elements
+ * @base: pointer to data to sort
+ * @num: number of elements
+ * @cmp: pointer to comparison function
+ * @ctx: a context pointer for the cmp function
+ *
+ * This function does a sort on the given array. The resulting array
+ * will be in ascending sorted order by the provided comparison function.
+ *
+ * The @cmp function should exactly match the type of the @base and
+ * @ctx arguments. Otherwise it can take three const void *.
+ */
+#if HAVE_TYPEOF
+#define asort(base, num, cmp, ctx) \
+_asort((base), (num), sizeof(*(base)), \
+ cast_if_type((cmp), \
+ int (*)(const __typeof__(*(base)) *, \
+ const __typeof__(*(base)) *, \
+ __typeof__(ctx)), \
+ int (*)(const void *, const void *, const void *)), (ctx))
+#else
+#define asort(base, num, cmp, ctx) \
+ _asort((base), (num), sizeof(*(base)), \
+ (int (*)(const void *, const void *, const void *))(cmp), ctx)
+#endif
+
+void _asort(void *base, size_t nmemb, size_t size,
+ int(*compar)(const void *, const void *, const void *),
+ const void *ctx);
+
+#endif /* CCAN_ASORT_H */