2 files changed, 23 insertions, 0 deletions
diff --git a/libbuild2/functions-string.cxx b/libbuild2/functions-string.cxx
index f458a59..c5cb216 100644
--- a/libbuild2/functions-string.cxx
+++ b/libbuild2/functions-string.cxx
@@ -55,6 +55,28 @@ namespace build2
       return names {name (trim (convert<string> (move (s))))};
     };
 
+    // Convert ASCII strings into lower/upper case.
+    //
+    f["lcase"] = [](string s)
+    {
+      return lcase (move (s));
+    };
+
+    f[".lcase"] = [](names s)
+    {
+      return names {name (lcase (convert<string> (move (s))))};
+    };
+
+    f["ucase"] = [](string s)
+    {
+      return ucase (move (s));
+    };
+
+    f[".ucase"] = [](names s)
+    {
+      return names {name (ucase (convert<string> (move (s))))};
+    };
+
     // String-specific overloads from builtins.
     //
     function_family b (m, "builtin");
diff --git a/libbuild2/utility.hxx b/libbuild2/utility.hxx
index 7dbff2f..369e58b 100644
--- a/libbuild2/utility.hxx
+++ b/libbuild2/utility.hxx
@@ -66,6 +66,7 @@ namespace build2
   using butl::icase_compare_string;
   using butl::icase_compare_c_string;
   using butl::lcase;
+  using butl::ucase;
   using butl::alpha;
   using butl::alnum;
   using butl::digit;