Just another update

Task/Reverse-a-string/ATS/reverse-a-string.ats

@@ -0,0 +1,38 @@
+//
+// How to compile:
+// patscc -DATS_MEMALLOC_LIBC -o string_reverse string_reverse.dats
+//
+
+#include
+"share/atspre_staload.hats"
+
+fun
+string_reverse
+(
+  x: string
+) : Strptr1 = let
+//
+val [n:int] x = g1ofg0(x)
+val y = string1_copy(x)
+val n = string1_length(x)
+val (pf, fpf | p) =
+  $UNSAFE.ptr_vtake{array(char,n)}(ptrcast(y))
+val () = array_subreverse(!p, i2sz(0), n)
+prval () = fpf(pf)
+//
+in
+  $UNSAFE.castvwtp0{Strptr1}(y)
+end (* end of [string_reverse] *)
+
+(* ****** ****** *)
+
+implement
+main0 () = let
+//
+val rev = string_reverse("asdf")
+val ((*void*)) = println! ("reverse(\"asdf\") = \"", rev, "\"")
+val ((*freed*)) = strptr_free (rev)
+//
+in
+  // nothing
+end // end of [main0]