2 files changed, 15 insertions, 0 deletions
diff --git a/src/common/container.c b/src/common/container.c
index 06e810a149..94f7f84df5 100644
--- a/src/common/container.c
+++ b/src/common/container.c
@@ -461,6 +461,20 @@ smartlist_sort_strings(smartlist_t *sl)
   smartlist_sort(sl, _compare_string_ptrs);
 }
 
+/** Helper: compare two DIGEST_LEN digests. */
+static int
+_compare_digests(const void **_a, const void **_b)
+{
+  return memcmp((const char*)*_a, (const char*)*_b, DIGEST_LEN);
+}
+
+/** Sort the list of DIGEST_LEN-byte digests into ascending order. */
+void
+smartlist_sort_digests(smartlist_t *sl)
+{
+  smartlist_sort(sl, _compare_string_ptrs);
+}
+
 #define DEFINE_MAP_STRUCTS(maptype, keydecl, prefix)      \
   typedef struct prefix ## entry_t {                      \
     HT_ENTRY(prefix ## entry_t) node;                     \
diff --git a/src/common/container.h b/src/common/container.h
index 40cf13f4fa..1031a6ef13 100644
--- a/src/common/container.h
+++ b/src/common/container.h
@@ -72,6 +72,7 @@ void smartlist_insert(smartlist_t *sl, int idx, void *val);
 void smartlist_sort(smartlist_t *sl,
                     int (*compare)(const void **a, const void **b));
 void smartlist_sort_strings(smartlist_t *sl);
+void smartlist_sort_digests(smartlist_t *sl);
 void *smartlist_bsearch(smartlist_t *sl, const void *key,
                         int (*compare)(const void *key, const void **member));