// Write a character to the framebuffer
void fb_putchar(u8 ascii) {
//serial_wait();
// move to the next line if character is a newline
if (ascii == '\n') {
// if bottom row
if (fb.pos >= FB_BOTTOMROW) {
fb_scroll();
}
else {
fb.pos = ((fb.pos / FB_COLS) + 1) * FB_COLS;
fb_mov();
}
}
else if (ascii == '\b') {
if (fb.pos > FB_FIRSTCELL) {
fb.pos--;
fb_mov();
fb.p[fb.pos] = fb_mkchar(FB_BLACK, FB_WHITE, ' ');
}
}
else {
if (fb.pos == FB_LASTCELL) {
fb_scroll();
}
fb.p[fb.pos] = fb_mkchar(FB_BLACK, FB_WHITE, ascii);
fb.pos++;
fb_mov();
}
}
void fb_put(char c)
{
uint32_t location = fb_position();
if (c == 0x08 && s_fbx)
{
s_fbx--;
}
else if (c == '\r')
{
s_fbx = 0;
}
else if (c == '\n')
{
s_fbx = 0;
s_fby++;
}
else if (c >= ' ')
{
FB[location] = c | s_attribute;
s_fbx++;
}
if (s_fbx >= FB_COLUMNS)
{
s_fbx = 0;
s_fby++;
}
fb_scroll();
fb_move_cursor();
}
//--------------------------------------------------------------------------
// fb_putchar()
//
// This routine parses the character and calls fb_writechar if it is a
// printable character
//
void fb_putchar(char c)
{
if (fb_tst) return; // can't print if we are testing the frame buffer
// First parse the character to see if it printable or an acceptable control
switch (c) {
case '\r':
fb_col = 0;
return;
case '\n':
fb_scroll();
return;
case '\b':
if (fb_col > 0)
{
fb_col--;
}
else
{
if (fb_row > 0)
{
fb_row--;
fb_col = COLS_PER_SCREEN - 1;
}
}
c = CURSOR_ON; // put the cursor where the character was
fb_writechar(c);
break;
default:
if (((uchar)c < FIRST_CHAR) || ((uchar)c > LAST_CHAR)) return; // drop anything we can't print
c -= FIRST_CHAR; // get aligned to the first printable character
fb_writechar(c);
// advance to next column
fb_col++;
if (fb_col == COLS_PER_SCREEN)
{
fb_col = 0;
fb_scroll();
}
c = CURSOR_ON; // write the cursor character
fb_writechar(c);
break;
}
} // fb_putchar()
