segmentation fault for while loop? - c

Question

I am trying to use the harversine function after scannig the test file
stoptimes.txt
I have defined the macro STOPTIMES as
#define STOPTIMES "/Users/21107195/Desktop/google_transit/stop_times.txt"
and each from each line fgets trip_id,arrival_time,departure_time,stop_id,stop_sequence,pickup_type,drop_off_type,timepoint as
324155,06:32:00,06:32:00,23789,1,0,0,1 respectively
int main(int argc, char* argv[]){
//CONDITION FOR NUMBER OF ARGUMENTS
if(argc!=6){
printf("error: number of arguments must=5");
exit(EXIT_FAILURE);}
else{
//CONVERT LATITUDES AND LONGITUDES TO DOUBLE
double start_lat=atof(argv[2]);
double start_long=atof(argv[3]);
double end_lat=atof(argv[4]);
double end_long=atof(argv[5]);
//CHECK TO SEE IF ARGUMENT LATS AND LONGS ARE VALID
if(!valid_location(start_lat,start_long)||!valid_location(end_lat,end_long)){
printf("invalid starting location: lat=%lf long=%lf\n",start_lat, start_long);
exit(EXIT_FAILURE);
}
else{
printf("valid locations: start lat=%lf start long=%lf end lat=%lf end long=%lf\n",start_lat,start_long,end_lat,end_long);
int trip_id;
int hour;
int minute;
int stop_id;
int distance_start_stop1;
//DECLARE FILE POINTER
FILE *stoptimes;
//OPEN FILE stops.txt
stoptimes=fopen(STOPTIMES, "r");
if(stoptimes==NULL){
printf("cannot open file stoptimes.txt");
exit(EXIT_FAILURE);
}
//CREATE ARRAY TO STORE LINE OF stops.txt
char line[BUFSIZ];
//CONDITIONAL VARIABLE FOR WHILE LOOP
int count=0;
while(fgets(line, sizeof line, stoptimes)!=NULL){
if(count>0){
sscanf(line,"%d,%d:%d:%*d,%*d:%*d:%*d,%d,%*d,%*d,%*d,%*d",&trip_id,&hour,&minute,&stop_id);
printf(".%d\n",count);
distance_start_stop1=(int)haversine(start_lat,start_long,getlat(stop_id),getlong(stop_id));
printf("\n");
}
count++;
}
//CLOCE FILE STOPTIMES.TXT
fclose(stoptimes);
}
Everytime I run the code it runs for between 300 and 100 times depending on how many functions are called after using the sscanf function and returns a segmentation fault 11.
This is the code for
getlat(stop id)
where the stops file is
#define STOPS "/Users/21107195/Desktop/google_transit/stops.txt"
and the line should print out the following way
location_type, parent_station, stop_id, stop_code, stop_name, stop_desc, stop_lat, stop_lon, zone_id 0,,10000,10000,"Albany Hwy After Armadale Rd","",-32.1479054960,116.0201957650,4 where values a repsctively
double getlat(int stop_id){
int comstop_id;
double stop_lat;
//DECLARE FILE POINTER
FILE *stops;
//OPEN FILE stops.txt
stops=fopen(STOPS, "r");
//CREATE ARRAY TO STORE LINE OF stops.txt
char line[BUFSIZ];
//CONDITIONAL VARIABLE FOR WHILE LOOP
int count=0;
//WHILE LOOP GETTING LINES OF stop.txt
while(fgets(line, sizeof line, stops)!=NULL){
if(count>0){
if(isdigit(line[2])){
sscanf(line,"%*d,%*d,%d,%*d,%*100[^,],%*100[^,],%lf,%*lf,%*s",&comstop_id,&stop_lat);
}
else{
sscanf(line,"%*d,,%d,%*d,%*100[^,],%*100[^,],%lf,%*lf,%*s",&comstop_id,&stop_lat);
}
if(comstop_id==stop_id){
break;
}
}
count++;
}
printf("latitude:%lf/n",stop_lat);
fclose(stops);
return stop_lat;
}
**the fuction for getlong is the same except it retunr the value3 of the longitude
this is the function for haversine**
double haversine(double lat1, double lon1, double lat2, double lon2)
{
double deltalat = (lat2 - lat1) / 2.0;
double deltalon = (lon2 - lon1) / 2.0;
double sin1 = sin( degrees_to_radians(deltalat) );
double cos1 = cos( degrees_to_radians(lat1) );
double cos2 = cos( degrees_to_radians(lat2) );
double sin2 = sin( degrees_to_radians(deltalon) );
double x = sin1*sin1 + cos1*cos2 * sin2*sin2;
double metres = 2 * EARTH_RADIUS_IN_METRES * asin( sqrt(x) );
return metres;
}
double degrees_to_radians(double degrees){
return (degrees * M_PI / 180.0);
}