void calc_instruction_length(UBYTE * * , INSTRUCTION * );
void swapchars(UBYTE * , UBYTE , UBYTE );

void get_next_symbol(UBYTE * *);


UBYTE check_for_opcode(UBYTE * *, UWORD *);
UBYTE check_for_pseudo_op(UBYTE * * , INSTRUCTION *, SYMTAB * );
UBYTE check_for_symbol(UBYTE * *, UBYTE *);
UBYTE check_for_comment(UBYTE *);
UBYTE extract_opcode(UBYTE * * , UWORD * );
UBYTE get_reg_num(UBYTE * *, UWORD * );
UBYTE identify_address_mode(UBYTE * * , INSTRUCTION * );
UBYTE openfiles(UBYTE *, UBYTE *);
UBYTE save_for_pass_two(UBYTE *);

UWORD assemble(void);
UWORD passone(UBYTE *);
UWORD passtwo(void);
UWORD search_symtab(UBYTE * );
UWORD write_object_file(void);