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8 nishi 1 
/* $Id: text.c 9 2024-08-28 16:35:27Z nishi $ */
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#include "text.h"
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#include "char.h"
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#include "video.h"
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#include "math.h"
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#include "io.h"
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char caps;
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unsigned short posx;
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unsigned short posy;
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unsigned short curx;
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unsigned short cury;
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short text_kbd_data;
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extern int scrwidth;
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extern int scrheight;
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extern unsigned char keylist[];
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extern unsigned char keylist_caps[];
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char getch(void){
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	char k = 0;
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rep:
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	while((k = inp(text_kbd_data)) == 0);
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	while(inp(text_kbd_data) != 0);
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	unsigned char top = (k & 0xf0) >> 4;
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	unsigned char bot = (k & 0x0f);
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	top--;
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	bot--;
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	if(keylist[top * 13 + bot] == '!'){
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		caps = caps == 0 ? 1 : 0;
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		goto rep;
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	}
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	return caps ? keylist_caps[top * 13 + bot] : keylist[top * 13 + bot];
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}
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void clear(void){
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	int i;
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	int size = mull(scrwidth, scrheight);
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	setvramaddr(0);
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	for(i = 0; i < size; i++) vramchar(' ');
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}
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void scroll_y(void){
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	int i;
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	int size = mull(scrwidth, scrheight - 1);
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	for(i = 0; i < size; i++){
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		setreadvramaddr(i + 32);
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		unsigned char ch = getvramchar();
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		setvramaddr(i);
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		vramchar(ch);
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	}
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	for(i = 0; i < scrwidth; i++){
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		vramchar(' ');
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	}
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}
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void print_ptr(void* ptr){
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	unsigned short p = (unsigned short)ptr;
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	int i;
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	const char hex[] = "0123456789ABCDEF";
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	putstr("0x");
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	for(i = 0; i < 4; i++){
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		putchar(hex[(p & 0xf000) >> 12]);
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		p = p << 4;
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	}
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}
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void cursor(void){
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	setvramaddr(mull(posy, scrwidth) + posx);
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	vramchar(248);
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	curx = posx;
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	cury = posy;
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	if(curx == scrwidth){
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		curx = 0;
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		cury++;
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	}
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}
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void killcursor(void){
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	setvramaddr(mull(cury, scrwidth) + curx);
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	vramchar(' ');
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}
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void putchar(char c){
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	if(c == '\r'){
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		posx = 0;
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	}else if(c == '\n'){
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		posy++;
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	}else{
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		setvramaddr(mull(posy, scrwidth) + posx);
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		vramchar(c);
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		posx++;
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		if(posx == scrwidth){
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			posx = 0;
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			posy++;
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		}
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	}
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	if(posy == scrheight){
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		scroll_y();
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		posy = scrheight - 1;
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		posx = 0;
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	}
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}
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void putstr(char* str){
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	int i;
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	for(i = 0; str[i] != 0; i++) putchar(str[i]);
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}
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void text_init(void){
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	posx = 0;
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	posy = 0;
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	curx = 0;
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	cury = 0;
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	caps = 0;
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}
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void text_card(int t, int port){
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	if(t == 0x22){
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		text_kbd_data = port - 2;
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	}
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}