vbscript: Added interp_sub implementation.

dlls/vbscript/interp.c

@@ -417,8 +417,26 @@ static HRESULT interp_add(exec_ctx_t *ctx)
 
 static HRESULT interp_sub(exec_ctx_t *ctx)
 {
-    FIXME("\n");
-    return E_NOTIMPL;
+    variant_val_t r, l;
+    VARIANT v;
+    HRESULT hres;
+
+    TRACE("\n");
+
+    hres = stack_pop_val(ctx, &r);
+    if(FAILED(hres))
+        return hres;
+
+    hres = stack_pop_val(ctx, &l);
+    if(SUCCEEDED(hres)) {
+        hres = VarSub(l.v, r.v, &v);
+        release_val(&l);
+    }
+    release_val(&r);
+    if(FAILED(hres))
+        return hres;
+
+    return stack_push(ctx, &v);
 }
 
 static HRESULT interp_neg(exec_ctx_t *ctx)

dlls/vbscript/tests/lang.vbs

@@ -75,4 +75,9 @@ Call ok(false + 6 + true = 5, "false + 6 + true <> 5")
 Call ok(getVT(2+null) = "VT_NULL", "getVT(2+null) = " & getVT(2+null))
 Call ok(2+empty = 2, "2+empty = " & (2+empty))
 
+Call ok(5-1 = 4, "5-1 = " & (5-1))
+Call ok(3+5-true = 9, "3+5-true <> 9")
+Call ok(getVT(2-null) = "VT_NULL", "getVT(2-null) = " & getVT(2-null))
+Call ok(2-empty = 2, "2-empty = " & (2-empty))
+
 reportSuccess()