void video_putc(char ch)
{
switch(ch)
{
case '\n':
cursor_col = 0;
cursor_row += 1;
break;
case '\r':
cursor_col = 0;
break;
case '\b':
if (cursor_col) cursor_col--;
else return;
break;
case '\t':
cursor_col = (cursor_col/8+1)*8;
break;
default:
video_write_char(ch);
cursor_col++;
if (cursor_col > VIDEO_COLS-1)
{
cursor_row++;
cursor_col=0;
}
}
if (cursor_row > VIDEO_ROWS-1)
video_scroll(1);
video_set_cursor(cursor_row, cursor_col);
}
void vga_putc(unsigned char byte)
{
if (byte == '\n') {
video_line++;
video_col = 0;
} else if (byte == '\r') {
video_col = 0;
} else if (byte == '\b') {
video_col--;
} else if (byte == '\t') {
video_col += 4;
} else if (byte == '\a') {
//beep
//beep(500);
} else {
vidmem[((video_col + (video_line *COLS)) * 2)] = byte;
vidmem[((video_col + (video_line *COLS)) * 2) +1] = VGA_ATTR_CLR_WHT;
video_col++;
}
if (video_col < 0) {
video_col = 0;
}
if (video_col >= COLS) {
video_line++;
video_col = 0;
}
if (video_line >= LINES) {
video_scroll();
video_line--;
}
// move the cursor
write_crtc((video_col + (video_line *COLS)) >> 8, CRTC_CURSOR_HI);
write_crtc((video_col + (video_line *COLS)) & 0x0ff, CRTC_CURSOR_LO);
}
