1 files changed, 15 insertions, 0 deletions
diff --git a/src/libstddjb/uint64_reverse.c b/src/libstddjb/uint64_reverse.c
new file mode 100644
index 0000000..f8730fe
--- /dev/null
+++ b/src/libstddjb/uint64_reverse.c
@@ -0,0 +1,15 @@
+/* ISC license. */
+
+#include <skalibs/uint64.h>
+
+void uint64_reverse (char *s, unsigned int n)
+{
+  while (n--)
+  {
+    char c = s[0] ; s[0] = s[7] ; s[7] = c ;
+    c = s[1] ; s[1] = s[6] ; s[6] = c ;
+    c = s[2] ; s[2] = s[5] ; s[5] = c ;
+    c = s[3] ; s[3] = s[4] ; s[4] = c ;
+    s += 8 ;
+  }
+}