This is a c programming assignment. Thanks for the help! I need help with the fo

Question

This is a c programming assignment. Thanks for the help!

I need help with the following functions in an assignment. Both functions should have airPdata not lListAirPdata.

Overview of this assignment:

In the assignment, I am reading from a CSV file and populating a structure called airPdata with the information from the CSV file. The structure has the following fields: LocID, fieldname, city, longitude, and latitude. Depending on what the user inputs as the third parameter in the command line: if 'a' is passed the program will sort the LocID alphabetically and if 'n' is passed the program will sort the latitudes from south to north. One done sorting the program will print out the sorted information.

The following structure can't be changed.

1.4.2 void sortByLocID(IListAirPdata airports); Description: Sorts the airports alphabetically by the string named Loc ID. Remember that the Loc ID has been filtered to three or four letters Special Cases: Remember the helipads! In other words, it is recommended to skip airports whose Loc ID begin with a number, or start with either FL or X followed by two digits. Therefore, it is recommended to discard any airport whose LocID is not three or four letters. Caveat: Since the sorting options are mutually exclusive, this function can destruc tively manipulate the input list to produce the desired results. Returns: Nothing. However the input data should be seriously modified by this pro- sfa 1.4.3 void sortByLatitude(.a *airports); Description: Sorts the airports by latitude from South to North. Think of this as an Escape from Key West to Georgia. Special Cases: Remember the helipads! In other words, it is acceptable to skip air ports whose Loc ID begin with a number, or start with either FL or X followed by two digits. Remember, it is recommended to discard any Loc ID that does not contain three or four letters only Output: Output the airports' data per the output file specification derived from walk- ing thru the AVL tree until reaching the maximum latitude for the Florida border. For the purposed of this exercise, assume 31 degrees North. Caveat: Since the sorting options are mutually exclusive, this function can destruc- tively manipulate the input list to produce the desired results. Hint: Remember to use the the converted Latitude as a measurement criteria for build ing an AVL tree. Returns: Nothing. However the input data could be seriously modified by this pro- cess

Explanation / Answer

AirPData.c
--------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "airPData.h"

#define BUFFER_SIZE 1024 // Define a buffer size for the airports
#define MAX_AIRPORTS 1000
#define LOC_BUFFER_SIZE 15

void my_strtok(char **buffer, char delimiter, char* destination);
float sexag2decimal(char *degreeString);

int main(int argc, char **argv)
{

   // *fname = argv[1] - Char pointer to fname gets the second argument
   // variable. First being the program itself.
   char *fname = argv[1];

   if (argc < 2)
   {
       // If the argument count is less than 2, throw an error and quit
       fprintf(stderr, "Error. Needs filename as argument. ");
       return -1;
   }

   /* Declare file pointer
   * Pointer magic going on here...don't worry about it */
   FILE *file = fopen(fname, "r");

   /* delimiter is a const char because that is what the function
   * strtok takes and it is set as the comma */
   const char delimiter[2] = ",";

   /* char pointer "token" not initialized */
   char *token = NULL;

   char buffer[BUFFER_SIZE];

   if (file == NULL) // If the file isn't found or something happened
   {
       fprintf(stderr, "Could not open file. ");
       return 0; // and return 0 to the if
   }
   else {
       printf("File opened successfully. ");

       airPData airports[MAX_AIRPORTS];
       int count = 0;
       int index = 0;
      
       while ((fgets(buffer, sizeof(buffer), file)) != NULL) // Read the lines of the csv file
       {
           count += 1;
           airPData *airport = &airports[index++]; // Create an array of airPData structs to be able to store the data

           airport->LocID = malloc(sizeof(char) * (4 + 1));
           airport->fieldName = malloc(sizeof(char) * (60 + 1));
           airport->city = malloc(sizeof(char) * (35 + 1));

           /* token is just one part of the string *
           * strtok splits the string put into it by the delimiter
           * which in this case is a comma */
           char *bufferPtr = buffer;

           my_strtok(&bufferPtr, ',', NULL);                       // SKIP Site Number
           my_strtok(&bufferPtr, ',', airport->LocID);               // Get and Save Location ID
           my_strtok(&bufferPtr, ',', airport->fieldName);           // Get and Save Field Name
           my_strtok(&bufferPtr, ',', airport->city);               // Get and Save City
           my_strtok(&bufferPtr, ',', NULL);                       // SKIP State
           my_strtok(&bufferPtr, ',', NULL);                       // SKIP
           my_strtok(&bufferPtr, ',', NULL);                       // SKIP
           my_strtok(&bufferPtr, ',', NULL);                       // SKIP
           my_strtok(&bufferPtr, ',', airport->latitude);           // Get and Save Latitude
           my_strtok(&bufferPtr, ',', airport->longitude);           // Get and Save Longitude
           my_strtok(&bufferPtr, ',', NULL);                       // SKIP
           my_strtok(&bufferPtr, ',', NULL);                       // SKIP
           my_strtok(&bufferPtr, ',', NULL);                       // SKIP
           my_strtok(&bufferPtr, ',', NULL);                       // SKIP
           my_strtok(&bufferPtr, ',', NULL);                       // SKIP Control Tower              
       }

       int length = index;

       printf("code,name,city,lat,lon ");

       for (index = 0; index < length; index++)
       {
           airPData *airport = &airports[index];
           printf("%12s|", airport->LocID);
           printf("%55s|", airport->fieldName);
           printf("%40s|", airport->city);
           printf("%14s|", airport->latitude);
           printf("%14s|", airport->longitude);
           printf(" ");
       }

       // FREEEEEEDOOOOOMMMMMMMM!!!
       for (index = 0; index < length; index++)
       {
           airPData *airport = &airports[index];
           free(airport->LocID);
           free(airport->fieldName);
           free(airport->city);
       }
      
   }

   char myString[50] = { 0 };
   strcpy(myString, "28-26-08.0210S");

   sexag2decimal(myString); // Testing of sexag2decimal function
  
   fclose(file); // Don't forget to close!

   return 0;
}

void my_strtok(char **buffer, char delimiter, char* destination)
{
   // Search through the buffer and return a pointer to the first occurence of the delim
   // in the buffer
   char *end = strchr(*buffer, delimiter);
   if (destination != NULL)
   {
       memcpy(destination, *buffer, (end - *buffer)); // Copy the token using memcpy
       destination[end - *buffer] = 0;
   }
   *buffer = end + 1; // Advance the buffer to the character after the delimiter
}

float sexag2decimal(char *degreeString)
{
   // Check if degreeString is NULL
   if (degreeString == NULL)
   {
       return 0.0;
   }

   // START DEGREES
   // Degrees needs no conversion because it's just a number from 0 to 1880
   char *ddStr = strtok(degreeString, "-");
   if (ddStr == NULL)
   {
       return 0.0;
   }
   int dd = atoi(ddStr);
   // END DEGREES

   // START MINUTES
   char *mmStr = strtok(NULL, "-");
   if (mmStr == NULL)
   {
       return 0.0;
   }
   int mm = atoi(mmStr); // Minutes
   // END MINUTES

   // START SECONDS
   char *ssStr = strtok(NULL, ".");
   if (ssStr == NULL)
   {
       return 0.0;
   }
   int ss = atoi(ssStr); // Seconds
   // END SECONDS

   // START MAS
   char *masDStr = strtok(NULL, "");
   char direction;
   if (masDStr == NULL)
   {
       return 0.0;
   }
   int mas = atoi(masDStr); // Milli-Arc Seconds
   // END MAS

   // Check the length of masDStr and get the direction char out of it
   if (strlen(masDStr) == 5)
   {
       direction = masDStr[4]; // Direction
   }
   else
   {
       fprintf(stderr, "Error in MASD string");
       return 0.0;
   }

   // Conversions per specs pg 5
   float ssMasCombined = ss + mas / 1000.0;
   float mmFinal = mm / 60.0;
   float ssMasFinal = ssMasCombined / (pow(60.0, 2));

   float result = dd + mmFinal + ssMasFinal;

   if (direction == 'S')
   {
       result = result * -1;
   }

   if (direction == 'W')
   {
       result = result * -1;
   }

   printf("%.4f ", result);
   printf("%d %d", ss, mas);

   // Return
return result;

-----------------------------------------------------------
AirPData.h
-----------------------------
typedef struct airPData
{
   char *LocID; //Airport’s ‘‘Short Name’’, ie MCO
   char *fieldName; //Airport Name
   char *city; //Associated City
   float latitude; //Latitude
   float longitude; //Longitude
} airPData;

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