The dreaded seg fault :'(

I am getting a seg fault and have no idea why. I pared my code down and I know the problem is somewhere within this block. I'm wondering if it's because of my declarations. Am I doing bad things with memory?

I'll be working with a linked list of structures called "shipment"s. A structure called tempdata will hold data until it's manipulated.

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
 
typedef struct  /*will only be making one tempdata structure*/       
{
        int number;
        char person[30];
        char city1[30];
        char city2[30];
}tempdata;
 
typedef struct nodetag
{
        int truck;
        char owner[30];
        char departcity[30];
        char arrivecity[30];
        int begintime;
        struct nodetag *next;
}shipment;

int main(int argc, char *argv[])
{
        /*Declarations of Variables*/
        shipment *head;         /*make ptr to a shipment structure*/
        tempdata tempship;      /*make new structure*/
        FILE *inputfile;
        char action;
        char endline; /*junk*/
 
        head=NULL;              /*to be used later*/
 
        /*Make sure of correct # of parameters. If
        incorrect, print error msg.*/
        if(argc != 2)
        {
                printf("Wrong # of parameters!\n");
                printf("Usage: %s <input-file-name>\n", argv[0]);
                exit(-1);
        }
 
        /*Make sure file DOES open. If not, print error msg.*/
        if((inputfile = fopen(argv[1], "r"))==NULL)
        {
                printf("Unable to open file %s for input\n", argv[1]);
                exit(-1);
        }
 
        while(fscanf(inputfile, "%c %d %s %s %s \n",
                &action,
                tempship.number,
                tempship.person,
                tempship.city1,
                tempship.city2,
                &endline) != EOF)
        {
                /*then goes into switch statement
                which is DEFINITELY not the source of the problem*/
        }
        fclose(inputfile);
        return(0);
}