/*********************************************************
 *
 *                    main.c
 *
 *  Main program for the phone number program.  The main
 *  program is responsible for all interactions with the
 *  user.  It first determines the file that the phone
 *  book is stored on and then calls read_phone_file to
 *  read the phone book.  The program then asks the user
 *  for the names of people and prints their phone numbers.
 *  The get_phone_number procedure us used to lookup a
 *  phone number given a person's name.  The phone book
 *  data structure is maintained by the routines in the
 *  phone.c file.
 *
 *******************************************************/


#include <stdio.h>
#include <string.h>
#include "phone.h"


int main (int argc, char** argv)
{
    FILE* fid;
    char name[NAMELENGTH];
    char* phone;

    if (argc != 2) {
        printf ("usage: phone phone_file\n");
        return (1);
    }

    fid = fopen (argv[1], "r");
    if (fid == NULL) {
        printf("unable to open phone file: %s\n", argv[1]);
        return (2);
    }

    read_phone_file (fid);


    while (TRUE) {

        printf("name: ");
        scanf ("%20s", &name[0]);

        if (strcmp (name, "exit") == 0)
            break;

        phone = get_phone_number(name);

        if (phone == NULL) {
            printf("sorry, no number for %s\n", name);
        } else {
            printf("the phone number for %s is %s\n", name, phone);
        }

    }

    return (0);
}