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18 nishi 1 
/* $Id: text.c 28 2024-08-31 12:49:20Z nishi $ */
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#include "text.h"
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#include "video.h"
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#include "math.h"
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#include "../char.h"
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#include "../io.h"
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char caps;
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28 nishi 13 
short posx;
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short posy;
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short curx;
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short cury;
18 nishi 17 
unsigned char cursorcolor;
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unsigned char cursorindex;
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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 agetch(void){
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	char k;
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rep:
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	if((k = inp(text_kbd_data)) == 0) return 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;
20 nishi 40 
	}else if(keylist[top * 13 + bot] == '?'){
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		return 1;
18 nishi 42 
	}
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	return caps ? keylist_caps[top * 13 + bot] : keylist[top * 13 + bot];
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}
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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;
20 nishi 58 
	}else if(keylist[top * 13 + bot] == '?'){
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		return 1;
18 nishi 60 
	}
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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 = muli(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 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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28 nishi 82 
unsigned short charbuf;
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18 nishi 84 
void cursor(void){
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	setvramaddr(muli(posy, scrwidth) + posx);
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	_vramchar(136 + 8 * cursorcolor);
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	cursorindex++;
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	if(cursorindex == 2){
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		cursorcolor++;
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		cursorindex = 0;
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		if(cursorcolor == 15) cursorcolor = 0;
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	}
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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(muli(cury, scrwidth) + curx);
28 nishi 103 
	if(charbuf == 0xffff){
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		vramchar(' ');
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	}else{
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		vramchar(charbuf & 0xff);
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	}
18 nishi 108 
}
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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++;
28 nishi 115 
	}else if(c == 0x08){
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		if(posx > 0){
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			posx--;
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		}else{
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			posy--;
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			posx = scrwidth - 1;
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		}
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		setreadvramaddr(muli(posy, scrwidth) + posx);
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		charbuf = getvramchar();
18 nishi 124 
	}else{
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		setvramaddr(muli(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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140 
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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	cursorcolor = 0;
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	cursorindex = 0;
28 nishi 153 
	charbuf = 0xffff;
18 nishi 154 
}
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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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	}
160 
}