// some text output code (printable characters only)
// with very limited formatting, \r, \n
void putstring(char *s) {
while (*s) {
unsigned char tmp = *s;
switch (tmp) {
case '\r':
nTextPos = nTextRow;
break;
case '\n':
scrn_scroll();
nTextPos = nTextRow;
break;
default:
if ((tmp < 32) || (tmp >= 127)) tmp='.';
vdpchar(nTextPos, tmp);
nTextPos++;
if (nTextPos > nTextEnd) {
scrn_scroll();
nTextPos = nTextRow;
}
break;
}
s++;
}
}
/* ----------------------------------------------------
* Function: scrn_putc
* --------------------------------------------------*/
void scrn_putc(char c){
unsigned char cu = (unsigned char) c;
/*
* Horizontal Tab
*/
if(cu == '\t'){
xpos = (xpos + tab_width) & ~(tab_width - 1);
}
/*
* Carriage Return
*/
else if(cu == '\r'){
xpos = 0;
}
/*
* Line Feed
*/
else if(cu == '\n'){
xpos = 0;
ypos += 1;
}
/*
* Backspace
*/
else if(cu == 0x08){
if(xpos > 0){
xpos--;
}
}
/*
* Printable character
*/
else if(cu >= ' '){
uint16_t *vidmem_ptr = (uint16_t *) VIDEO_MEMORY_BASE;
vidmem_ptr += xpos + SCREEN_WIDTH*ypos;
*vidmem_ptr = cu | (attribute << 8);
xpos += 1;
}
if(xpos >= SCREEN_WIDTH){
xpos = 0;
ypos += 1;
}
if(ypos >= SCREEN_HEIGHT){
scrn_scroll();
}
scrn_move_hw_cursor();
}
