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/* char_vhl = char VGA high level function */
#include "yotlibc.h"
extern int char_vga_cursor_x;
extern int char_vga_cursor_y;
void chv_init_cursor(void){
int curpos = char_vga_get_cursor();
char_vga_cursor_x = CHAR_VGA_GETX(curpos);
char_vga_cursor_y = CHAR_VGA_GETY(curpos);
}
void chv_get_cursor(xycoord)
XYCOORD* xycoord;
{
chv_init_cursor();
xycoord->x = char_vga_cursor_x;
xycoord->y = char_vga_cursor_y;
}
void chv_set_cursor(xycoord)
XYCOORD* xycoord;
{
char_vga_cursor_x = xycoord->x;
char_vga_cursor_y = xycoord->y;
char_vga_set_cursor(
CHAR_VGA_POSITION(char_vga_cursor_x, char_vga_cursor_y));
}
void chv_set_cursor_direct(x, y)
int x;
int y;
{
char_vga_cursor_x = x;
char_vga_cursor_y = y;
char_vga_set_cursor(
CHAR_VGA_POSITION(char_vga_cursor_x, char_vga_cursor_y));
}
void chv_sync_cursor(void){
char_vga_set_cursor(
CHAR_VGA_POSITION(char_vga_cursor_x, char_vga_cursor_y));
}
void chv_reset_cursor(void){
chv_set_cursor_direct(0, 0);
}
void chv_movenext_cursor(void){
if(++char_vga_cursor_x >= CHAR_VGA_SCREENX){
char_vga_cursor_x -= CHAR_VGA_SCREENX;
char_vga_cursor_y++;
}
if(char_vga_cursor_y >= CHAR_VGA_SCREENY){
char_vga_cursor_y = CHAR_VGA_SCREENY;
chv_scroll(1);
}
}
void chv_moveprev_cursor(void){
if(--char_vga_cursor_x < 0){
char_vga_cursor_x += CHAR_VGA_SCREENX;
char_vga_cursor_y--;
}
if(char_vga_cursor_y < 0){
char_vga_cursor_y = 0;
}
}
void chv_move_cursor(count)
int count;
{
int n;
n = CHAR_VGA_POSITION(char_vga_cursor_x, char_vga_cursor_y) + count;
char_vga_cursor_x = CHAR_VGA_GETX(n);
char_vga_cursor_y = CHAR_VGA_GETY(n);
if(char_vga_cursor_x > CHAR_VGA_SCREENX){
char_vga_cursor_x = CHAR_VGA_SCREENX - 1;
}else if(char_vga_cursor_x < 0){
char_vga_cursor_x = 0;
}
if(char_vga_cursor_y > CHAR_VGA_SCREENY){
char_vga_cursor_y = CHAR_VGA_SCREENY - 1;
}else if(char_vga_cursor_y < 0){
char_vga_cursor_y = 0;
}
}
void chv_putchar(c)
int c;
{
chv_memwrite(
CHAR_VGA_POSITION(char_vga_cursor_x, char_vga_cursor_y) * 2, c);
chv_movenext_cursor();
}
void chv_putchar_color(c, color)
int c;
int color;
{
int pos = CHAR_VGA_POSITION(char_vga_cursor_x, char_vga_cursor_y) * 2;
chv_memwrite(pos++, c);
chv_memwrite(pos, color);
chv_movenext_cursor();
}
void chv_backspace(void){
chv_moveprev_cursor();
chv_memwrite(
CHAR_VGA_POSITION(char_vga_cursor_x, char_vga_cursor_y) * 2, ' ');
}
void chv_clear(void){
int i;
XYCOORD xycoord;
chv_memwrite(0, 'A');
for(i=0; i< CHAR_VGA_MMIOSIZE; ){
chv_memwrite(i++, ' ');
chv_memwrite(i++, CHV_COLORPAIR(
CHV_COLOR_LIGHT_GRAY, CHV_COLOR_BLACK));
}
}
void chv_scroll(line)
int line;
{
int c, i;
int src, dest;
if(line > 0){
src = line * CHAR_VGA_SCREENX * 2;
for(dest = 0; dest < CHAR_VGA_MMIOSIZE && src < CHAR_VGA_MMIOSIZE;
dest++, src++){
c = chv_memread(src);
chv_memwrite(dest, c);
}
for(; dest < CHAR_VGA_MMIOSIZE; ){
chv_memwrite(dest++, ' ');
chv_memwrite(dest++, CHV_COLORPAIR(
CHV_COLOR_LIGHT_GRAY, CHV_COLOR_BLACK));
}
char_vga_cursor_y -= line;
if(char_vga_cursor_y < 0){
char_vga_cursor_y = 0;
chv_sync_cursor();
}
}
}
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