apple2a/runtime.h
2018-08-04 23:38:44 -07:00

54 lines
1.4 KiB
C

#ifndef __RUNTIME_H__
#define __RUNTIME_H__
#include "platform.h"
// Line number used for "no line number".
#define INVALID_LINE_NUMBER 0xFFFF
// Maximum number of variables. These fit in the zero page.
#define MAX_VARIABLES 16
// Location of first variable in zero page. See zeropage.s and zeropage.inc
// in the compiler tree. They seem to use 26 bytes, so we start after that.
// Each variable takes two bytes (int16_t).
#define FIRST_VARIABLE 26
extern uint16_t g_cursor_x;
extern uint16_t g_cursor_y;
extern uint16_t g_showing_cursor;
extern uint8_t g_cursor_ch;
extern uint8_t g_variable_names[MAX_VARIABLES*2];
void initialize_runtime(void);
void clear_for_stack(void);
uint8_t *cursor_pos(void);
void show_cursor(void);
void hide_cursor(void);
void move_cursor(int16_t x, int16_t y);
void clear_to_eol(void);
void home(void);
void print(uint8_t *s);
void print_char(uint8_t c);
void print_int(uint16_t i);
void print_newline(void);
void for_statement(uint16_t line_number, uint16_t var_address, int16_t end_value, int16_t step,
uint16_t loop_top_addr);
uint16_t next_statement(uint16_t line_number, uint16_t var_address);
void syntax_error(uint16_t line_number);
void syntax_error_in_line(uint16_t line_number);
void undefined_statement_error(uint16_t line_number);
void gr_statement(void);
void text_statement(void);
void color_statement(uint16_t color);
void plot_statement(uint16_t x, uint16_t y);
#endif // __RUNTIME_H__