jscript: Implement the String.sub() method.

dlls/jscript/string.c

@@ -1004,8 +1004,8 @@ static HRESULT String_strike(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARA
 static HRESULT String_sub(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 {
-    FIXME("\n");
-    return E_NOTIMPL;
+    static const WCHAR subtagW[] = {'S','U','B',0};
+    return do_attributeless_tag_format(dispex, lcid, flags, dp, retv, ei, sp, subtagW);
 }
 
 /* ECMA-262 3rd Edition    15.5.4.15 */

dlls/jscript/tests/api.js

@@ -332,6 +332,15 @@ ok(tmp === "<STRIKE>test</STRIKE>", "'test'.strike() = " + tmp);
 tmp = "test".strike(3);
 ok(tmp === "<STRIKE>test</STRIKE>", "'test'.strike(3) = " + tmp);
 
+tmp = "".sub();
+ok(tmp === "<SUB></SUB>", "''.sub() = " + tmp);
+tmp = "".sub(3);
+ok(tmp === "<SUB></SUB>", "''.sub(3) = " + tmp);
+tmp = "test".sub();
+ok(tmp === "<SUB>test</SUB>", "'test'.sub() = " + tmp);
+tmp = "test".sub(3);
+ok(tmp === "<SUB>test</SUB>", "'test'.sub(3) = " + tmp);
+
 var arr = new Array();
 ok(typeof(arr) === "object", "arr () is not object");
 ok((arr.length === 0), "arr.length is not 0");