warning: invalid-strchar-charsub.asm(1): [-Wbuiltin-args]
    STRCHAR: Index 3 is past the end of the string
warning: invalid-strchar-charsub.asm(2): [-Wbuiltin-args]
    CHARSUB: Position 4 is past the end of the string
warning: invalid-strchar-charsub.asm(3): [-Wbuiltin-args]
    CHARSUB: Position starts at 1