Are All sins forgivable if one asks forgiveness before death and dosen't repeat those sins

Salam i want to know that there are major sins and minor sins in Islam so if some one commits major sins because minor sins are forgiven with tawbah but if someone does limited major sins, minor shirk, masturbation,pornography, smoking,drinking are they forgivable if the person who commits them asks for Allah's forgiveness before death and promises not to repeat those sins again and changes is there a chance for his forgivenessto be accepted?,please reply it will be helpfull