//

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include "/c/cs223/Hwk4/Deque.h"
#include <stddef.h>
#include "Deque.h"
#include <limits.h>

char * removeEOL(char * str);
bool compareStringsByKey(char * str1, char * str2, int pos, unsigned len, int * result);
bool quickSort(Deque * d, int pos, int len, int n);

int main(int argc, char * argv[])
{
int POS = 0;
unsigned LEN = INT_MAX;
char * endPtr = NULL;
int index = 1;

// Create deque to hold the lines from files
Deque D = NULL;
if (!createD(&D))
{
   exit(1);
}

// parse arguments
if (argc > 1)
{
   if (argv[1][0] == '-')
   {
         (argv[1])++;
         POS = strtol(argv[1], &endPtr, 10);
         if (*endPtr == ',')
         {
            while (argv[1][0] != ',')
            {
               (argv[1])++;
            }
            (argv[1])++;
            LEN = strtol(argv[1], &endPtr, 10);
         }
         index++;
   }

   // Read all files into deque
   while (index < argc)
   {
         FILE * f = fopen(argv[index], "r");
         if (!f)
         {
            printf("Error reading file %s\n", argv[index]);
            return 1;
         }
         else {
            char *line = NULL;
            size_t len = 0;
            while (getline(&line, &len, f) != -1) {
               if(!(addD(&D, line))) {
                     printf("incorrect use\n");
                     return 1;
               }
               line = NULL;
               len = 0;
            }
            free(line);
         }
         index++;
         fclose(f);
         f = NULL;
   }
   // Sort deque
   int n = 0;
   quickSort(&D, POS, LEN, n);

   // Print sorted deque
   char * l;
   while (!isEmptyD(&D))
   {
         remD(&D, &l);
         printf("%s", l);
         free(l);
   }
   destroyD(&D);
}
free(endPtr);
endPtr = NULL;
//exit(0);
return 0;
}

Forks Objective: To understand fork, exec, and pipes. The i...