1 files changed, 22 insertions, 0 deletions
diff --git a/lib/ocaml_rts/linksem/src_lem_library/xstring.ml b/lib/ocaml_rts/linksem/src_lem_library/xstring.ml
new file mode 100644
index 00000000..7a705aeb
--- /dev/null
+++ b/lib/ocaml_rts/linksem/src_lem_library/xstring.ml
@@ -0,0 +1,22 @@
+let explode s = 
+  let rec exp i l =
+    if i < 0 then l else exp (i - 1) (s.[i] :: l) in
+  exp (String.length s - 1) [];;
+
+let implode l = 
+  let res = String.create (List.length l) in
+  let rec imp i = function
+  | [] -> res
+  | c :: l -> res.[i] <- c; imp (i + 1) l in
+  imp 0 l;;
+
+let string_case s c_empty c_cons = begin
+  let len = String.length s in
+  if (len = 0) then c_empty else
+  c_cons (String.get s 0) (String.sub s 1 (len - 1))
+end;;
+
+let cons_string c s = begin
+  let cs = String.make 1 c in
+  cs ^ s
+end;;