#ifdef _CONSOLE_H
#define _CONSOLE_H
#else

/* Width of display in characters */
#define _CONSOLE_WIDTH          21

/* Height of the display in lines */
#define _CONSOLE_HEIGHT         8

/*
 * Size of the internal buffer in chars/bytes.
 * Can be set arbitrarily (but must not be 0)
 */
#define _CONSOLE_BUF_WIDTH      (_CONSOLE_WIDTH + 1)


/* Width of a tab (amount of spaces) */
#define _CONSOLE_TAB_LEN        4


/*
 * Structure to store the state of the console.
 * Contains the cursor position and an internal buffer.
 */
typedef struct {
    /*
     * Cursor position (column) of the next char to be written.
     * Unlike the convention set by CASIO:
     * the cursor position is 0-based!
     * The actual Casio cursor will not be set until the
     * consol is flushed!
     */
    unsigned char cursor_x;

    /*
     * Cursor position (row) of the next char to be written.
     * Unlike the convention set by CASIO:
     * the cursor position is 0-based!
     * The actual Casio cursor will not be set until the
     * consol is flushed!
     */
    unsigned char cursor_y;

    /*
     * Internal buffer of the console.
     * All those characters will be consecutive and in the same line.
     * If the cursor changes position, the buffer needs to be flushed.
     */
    char buf[_CONSOLE_BUF_WIDTH];

    /*
     * Amount of characters in the internal buffer.
     */
    unsigned char buf_strlen;
} _console;

/*
 * Console instance for the stdio functions like printf etc.
 */
extern _console _console_ctx;

int _console_read(_console *ctx, int file, char *ptr, int len);
int _console_write(_console *ctx, int file, char *ptr, int len);
void _console_set_cursor(_console *ctx, unsigned char x, unsigned char y);
void _console_flush(_console *ctx);
void _console_putc(_console *ctx, char c);


#endif /* _CONSOLE_H */