Subversion Repositories Shiroi

/* $Id: text.c 9 2024-08-28 16:35:27Z nishi $ */

#include "text.h"

#include "char.h"
#include "video.h"
#include "math.h"
#include "io.h"

char caps;

unsigned short posx;
unsigned short posy;
unsigned short curx;
unsigned short cury;

short text_kbd_data;

extern int scrwidth;
extern int scrheight;

extern unsigned char keylist[];
extern unsigned char keylist_caps[];

char getch(void){
        char k = 0;
rep:
        while((k = inp(text_kbd_data)) == 0);
        while(inp(text_kbd_data) != 0);
        unsigned char top = (k & 0xf0) >> 4;
        unsigned char bot = (k & 0x0f);
        top--;
        bot--;
        if(keylist[top * 13 + bot] == '!'){
                caps = caps == 0 ? 1 : 0;
                goto rep;
        }
        return caps ? keylist_caps[top * 13 + bot] : keylist[top * 13 + bot];
}

void clear(void){
        int i;
        int size = mull(scrwidth, scrheight);
        setvramaddr(0);
        for(i = 0; i < size; i++) vramchar(' ');
}

void scroll_y(void){
        int i;
        int size = mull(scrwidth, scrheight - 1);
        for(i = 0; i < size; i++){
                setreadvramaddr(i + 32);
                unsigned char ch = getvramchar();
                setvramaddr(i);
                vramchar(ch);
        }
        for(i = 0; i < scrwidth; i++){
                vramchar(' ');
        }
}

void print_ptr(void* ptr){
        unsigned short p = (unsigned short)ptr;
        int i;
        const char hex[] = "0123456789ABCDEF";
        putstr("0x");
        for(i = 0; i < 4; i++){
                putchar(hex[(p & 0xf000) >> 12]);
                p = p << 4;
        }
}

void cursor(void){
        setvramaddr(mull(posy, scrwidth) + posx);
        vramchar(248);
        curx = posx;
        cury = posy;
        if(curx == scrwidth){
                curx = 0;
                cury++;
        }
}

void killcursor(void){
        setvramaddr(mull(cury, scrwidth) + curx);
        vramchar(' ');
}

void putchar(char c){
        if(c == '\r'){
                posx = 0;
        }else if(c == '\n'){
                posy++;
        }else{
                setvramaddr(mull(posy, scrwidth) + posx);
                vramchar(c);
                posx++;
                if(posx == scrwidth){
                        posx = 0;
                        posy++;
                }
        }
        if(posy == scrheight){
                scroll_y();
                posy = scrheight - 1;
                posx = 0;
        }
}

void putstr(char* str){
        int i;
        for(i = 0; str[i] != 0; i++) putchar(str[i]);
}

void text_init(void){
        posx = 0;
        posy = 0;
        curx = 0;
        cury = 0;
        caps = 0;
}

void text_card(int t, int port){
        if(t == 0x22){
                text_kbd_data = port - 2;
        }
}