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/* Definitions of character sets and types of character sets */
#define NCHARSETS 2
#define G0 0
#define G1 1
#define UK_CHARSET 0x01
#define US_CHARSET 0x02
#define GRAPHICS 0x04
/* Variables */
#define MAX_PARAMS 12 /* Max number of params for an escape */
typedef struct { /* Cursor coordinate structure */
int x; /* Line position */
int y; /* Column position */
} position;
enum keystate { normal, application };
typedef struct {
position cursor; /* The current position of cursor */
int rows; /* The number of rows in window */
int cols; /* The number of cols in window */
int row_offset; /* The physical offset of upper edge */
int scr_upper; /* Upper limit of scroll region */
int scr_lower; /* Lower limit of scroll region */
void (*process_char)(); /* Next output processing function */
enum keystate key_state; /* For vt100 keypad */
unsigned char charset[NCHARSETS]; /* Current character set */
unsigned char textattr; /* Current text attributes */
int esc_param[MAX_PARAMS], *cur_param; /* Escape parameters */
int param_idx; /* Current index into esc_param */
int **videomem; /* Storage for the virtual screen */
int *tabstops; /* Tabstops in the columns */
position saved_cursor; /* Saved cursor position */
unsigned char saved_textattr; /* Saved text attributes */
} window;
struct physical {
window *subwins[2]; /* The smaller, split sub-windows */
int rows; /* The number of rows on the screen */
int cols; /* The number of cols on the screen */
};
extern int TABSTOP; /* Default value for tabstops */
/* Definitions of text attributes */
#define NORMAL 0x00
#define BOLD 0x01
#define UNDERLINE 0x02
#define BLINK 0x04
#define REVERSE 0x08
#define SELECTED 0xF0
int **alloc_video(); /* Allocate a video memory buffer */
void copy_video(); /* Copy a video buffer to an empty one */
void add_video(); /* Add a character to a video buffer */
void erase_video(); /* Erase a two-dimensional section */
void scroll_video(); /* Scroll a section of the buffer */
void revscroll_video(); /* Reverse-scroll a section of the buffer */
void rshift_video(); /* Shift part of a line right */
void paint_video(); /* Repaint the video buffer onto the screen */
void getsel_video(); /* Get a selection from the video buffer */
void clrsel_video(); /* Clear a selection from the video buffer */
void put_video(); /* Set a character in the video buffer */
int get_video(); /* Get a character from the video buffer */
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