India, May 29 -- Canadian shares look headed for a firm start on Thursday, with encouraging earnings by Royal Bank of Canada and Canadian Imperial Bank of Commerce, and a U.S. court ruling against U.S. President Donald Trump's sweeping tariff moves set to lift sentiment.

The US Court of International Trade in Manhattan has ruled Trump had overstepped his authority in imposing across-the-board duties on imports from U.S. trade partners.

The court also quashed duties imposed by Trump on Canada, Mexico and China under an emergency-powers law. Meanwhile, China has urged U.S. to "fully cancel the wrongful unilateral tariff measures."

The Trump administration has filed an appeal against the federal court ruling.

Royal Bank of Canada (RY.TO) r...