/*  isbnprefix.cpp
 *  Assignment 1's ISBN prefix program file.
 *  Copyright (C) 2009 Adrien Kwok.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License Version 3
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <[LINK REMOVED]>.
 *
 */
#include "stdheader.h"
#include "prefix.h"

void seekStart(FILE* fp) {
        fseek(fp, 0, SEEK_SET);
}

FILE* open(const char* filename){
        FILE* fp = new FILE;
        fp = fopen (filename, "r");
        return fp;
}
int registered(FILE* fp, int area){
        seekStart(fp);
        ifstream in(fp);
        while (!in.eof()) {
                int area0, minPublisher, maxPublisher;
                in >> area0 >> minPublisher >> maxPublisher;
                if (area0 == area) return true;
        }
        return false;
}
int minNoDigits(FILE* fp, int area){
        seekStart(fp);
        ifstream in(fp);
        while (!in.eof()) {
                // read one line
                int area0, minPublisher, maxPublisher;
                in >> area0 >> minPublisher >> maxPublisher;
                cout << maxPublisher;

                // determine the max number of digits
                if (area == area0) {
                        if (maxPublisher <= 9) return 1;
                        if (maxPublisher <= 99) return 2;
                        if (maxPublisher <= 999) return 3;
                        if (maxPublisher <= 9999) return 4;
                        if (maxPublisher <= 99999) return 5;
                        if (maxPublisher <= 999999) return 6;
                        return 7;
                }       
        }
       
        return 0;
}
int registered(FILE* fp, int area, int publisher){
        seekStart(fp);
        ifstream in(fp);
        while (in) {
                int area0, minPublisher, maxPublisher;
                in >> area0 >> minPublisher >> maxPublisher;
                if (area0 == area) {
                        if (minPublisher <= publisher && publisher <= maxPublisher) return true;
                }
        }
        return false;
}
int close (FILE* fp){
        int err = fclose(fp);
        return err == 0 ? true : false;
}

ifstream in(fp);