Input_function

int input( int array[500][500], int *x0, int *y0 ) {
    int x = 0;
    int y = 0;
    int err = 0;
    char c;
    printf("Size:\n");
    if ( scanf("%d %d%c", x0, y0, &c)!=3 || *x0<=0 || *y0<=0 || *x0>500 || *y0>500 || c!='\n' ) {
        printf("Invalid input.\n");
        return 0;
    }
    while ( y < *y0 ) {
        x = 0;
        while ( x < *x0 ) {
            c = fgetc(stdin);
            if ( (x== *x0 - 1) && (c!='\n') ) { //after enough inputs, newline must follow
                err = 1;
                break;
            }
            switch(c) { // only these three chars are accepted
            case 'o':
                array[y][x] = 1;
                break;
            case '.':
                array[y][x] = 0;
                break;
            case '!':
                array[y][x] = 2;
                break;
            case '\n': //if we have entered less chars than size
                if (x < *x0 - 1)
                    err = 1;
                break;
            default:
                err = 1;
                break;
            }
            x++;
        }
        if (x > *x0)
            err=1;
        y++;
    }
    if (y!=*y0)
        err=1;
    if (err==1) {
        printf("Invalid input.\n");
        return 0;
    }

    return 1;
}