Thread: Struct Population Problems in C

I am trying to sift through a .csv file and populate a struct at the top of the code in order to spit out the fields into a terribly made table that I slapped together. But whenever I try to compile it, it prints up to 2 fields fine before printing (null). What do? Please help me, I'm literally dying.


http://i.imgur.com/1eK5uqW.png

Code:

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <ctype.h>


/* Remember to turn struct into .h */
typedef struct airPdata{
 char *siteNumber; //FAA Site Number
 char *LocalID; //Airport's "Short Name", ie MCO
 char *fieldName; //Airport Name
 char *city; //Associated City
 char *state; //State
 char *latitude; //Latitude
 char *longitude; //Longitude
 char *controlTower; //Control Tower (Y/N)
}airPdata;


/* Sifts through .csv file and splits strings up into tokens by , delimiter. Returns the token to print function. */
char *getfield(char *line, int num){
	char *tok;
	for (tok = strtok(line, ","); tok && *tok; tok = strtok(NULL, ",\n"))
	{
		if(!--num)
			return tok;
	}
	return NULL;
}


/* Print function that spits out tokens sorted by getfield function. */
void print(char *file, FILE *fp, char *line)
	{	
	airPdata *ports;
	ports = (airPdata *) malloc(sizeof(airPdata));
	ports->siteNumber = malloc(sizeof(char)*1000);
	ports->fieldName = malloc(sizeof(char)*1000);
	ports->LocalID = malloc(sizeof(char)*1000);


		char *tmp=strdup(line);
		while(fgets(line, 500, fp))
		{
			char *tmp=strdup(line);
			ports->LocalID = getfield(tmp,2);
			ports->siteNumber = getfield(tmp, 1);
			ports->fieldName = getfield(tmp, 3);
			printf("%s	%s	%s\n", ports->siteNumber, ports->LocalID, ports->fieldName);
			free(tmp);
		}
	}
	
int main()
{
	//airPdata *ports;
	char file[20];
	char line[1000];
	int col;
	int row;
	
	printf ("Input Desired File Name: ");
	scanf ("%s", &file);
	FILE *fp = fopen(file, "r");
	
	if(fp==NULL)
	{
		printf("\nNo file...\n");
		return -1;
	}
	
			printf("\nFAA Site#	Short Name	Airport Name	");
			printf("City	ST	Latitude	");
			printf("Longitude	Tower\n");
			printf("----------	----------	----------	");
			printf("----	--	--------	");
			printf("---------	-----\n");


	print(file, fp, line);
	fclose(fp);


	return 0;
}