e.c

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#include <io.h>
#include <types.h>
#include <file.h>
#include <conio.h>
#include <string.h>
 
__start int main() {
    char data[2001];
    char view[80][25];
    memset(view, 0, 80 * 25);
    memset(data, 0, 2000);
    FILE* file = open(0x80, "");
    if(file == NULL)
        return -1;
 
    size_t size = read(data, 2000, file);
 
    cls();
    size_t n = 0;
    for(int j = 0; j < 24; j++) {
        for(int i = 0; i < 79; i++) {
            if(n > size)
                break;
            if(data[n] == '\n') {
                j++;
                i = -1;
                n++;
                continue;
            }
            view[i][j] = data[n];
            n++;
        }
    }
    Key key;
    Cursor cursor;
    Cursor def = getCursorPosition();
    int sizeY = 0;
    Attributes underCursor;
    underCursor.foreground = Black;
    underCursor.background = LightGrey;
    do {
        setCursorPosition(def);
        bool wasNewline;
        sizeY = 0;
        for(int j = 0; j < 24; j++) {
            wasNewline = false;
            for(int i = 0; i < 79; i++) {
                if(view[i][j] != 0) {
                    if(i == cursor.x && j == cursor.y)
                        cputc(view[i][j], underCursor.attributes, 1);
                    else
                        cputc(view[i][j], LightGrey, 1);
                    wasNewline = true;
                }
                else if(i == cursor.x && j == cursor.y) {
                    if(i != 0)
                        while(cursor.x > 0 && view[cursor.x - 1][cursor.y] == 0)cursor.x--;
                    cputc(view[i][j], underCursor.attributes, 1);
                }
            }
            if(!wasNewline)
                putc('~');
            else
                sizeY++;
            putc('\n');
        }
        printf("File: %s size: %i", 0x80, size);
        setCursorPosition(cursor);
        key = getc();
        if(key.character == 0 && key.scancode == 72) {//UP
            cursor = getCursorPosition();
            if(cursor.y > 0)
                cursor.y--;
            setCursorPosition(cursor);
        }
        else if(key.character == 0 && key.scancode == 80 ) {//DOWN
            cursor = getCursorPosition();
            if(cursor.y < sizeY)
                cursor.y++;
            if(cursor.y == sizeY)
                cursor.x = 0;
            setCursorPosition(cursor);
        }
        else if(key.character == 0 && key.scancode == 77) {//RIGHT
            cursor = getCursorPosition();
            cursor.x++;
            setCursorPosition(cursor);
        }
        else if(key.character == 0 && key.scancode == 75) {//LEFT
            cursor = getCursorPosition();
            cursor.x--;
            setCursorPosition(cursor);
        }
        else if(key.character == 8 && key.scancode == 14 && cursor.x > 0) { //backspace
            cursor = getCursorPosition();
            view[cursor.x ][cursor.y] = 0;
            cursor.x--;
            setCursorPosition(cursor);
        }
        else if(key.character == 13 && key.scancode == 28) {//enter
            cursor = getCursorPosition();
            if(cursor.y < sizeY)
                cursor.y++;
            cursor.x = 0;
            setCursorPosition(cursor);
        }
        else if(key.character == 19 && key.scancode == 31) {//save
            n = 0;
            bool isEmpty = true;
            cls();
            for(int j = 0; j < 24; j++) {
                isEmpty = true;
                for(int i = 0; i < 79; i++) {
                    if(view[i][j] == 0)
                        continue;
                    isEmpty = false;
                    data[n] = view[i][j];
                    n++;
                }
                if(!isEmpty) {
                    data[n] = '\n';
                    n++;
                }
            }
            if(data[n - 1] == '\n')
                n--;
 
            printf("Saved %iB = %i sectors and %i Bytes\n", n, n / 512, n % 512);
            int ret = write(data, n, file);
            return (ret > 0 ? 0 : ret);
        }
        else {
            view[cursor.x][cursor.y] = key.character;//TODO: edit in data, not in view!!!
            cursor.x++;
        }
    }
    while(key.character != 27 && key.scancode != 1);//escape
    cls();
    return 0;
}