main.c

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include "options.h"
#include "list.h"
#include "parser.h"

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

	//declares flags, then initializes them using options.c
	struct options *flags = (struct options *) malloc(sizeof(struct options));
	int *processes;

	if (initOptions(argc, argv, flags) == -1)
	{
		printf("%s\n", "Incorrect usage");
		exit(EXIT_FAILURE);
	}

	//if p is not selected, uses list.c to create a list of pid
	//then outputs information for them according to flags
	if (flags->p == 0)
	{
		processes = generateProcessList();
		int i = 0;
		while (processes[i] != 0)
		{
			generatePrint(flags, processes[i]);
			i++;
		}
		exit(EXIT_SUCCESS);
	}
	//otherwise it prints the information for the single pid. Also
	//tests if given pid is a valid input.
	else
	{
		processes = generateProcessList();
		int i = 0;
		int printed = 0;
		while (processes[i] != 0)
		{
			if (processes[i] == flags->p)
			{
				generatePrint(flags, flags->p);
				printed = 1;
			}
			i++;
		}
		if (printed == 0)
		{
			printf("PID DOES NOT EXIST\n");
			exit(EXIT_FAILURE);
		}
		exit(EXIT_SUCCESS);
	}
}