sHelper.c

/***********************************************************************
* FILENAME: sHelper.c
*
* DESCRIPTION:
* 	This file contains the sHelper function.
*
* AUTHORS: Matthew Derzay, CS Login: derzay
*          Ian Mark, CS Login: imark
*
***********************************************************************/

#include "sHelper.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#define BUF_SIZE 100

/**
 *  This function reteives the state of the process based on the pid 
 *  given. Then concatenates the information onto the result string.
 */
void sHelper(char* pid, char* result) {
	//Create file object.
	FILE *file;
	//Start of the filepath.
        char filePath[] = "/proc/";
	//Next word in the file.
	char nextWord[BUF_SIZE];
	//Index of the elements in the file.
   	int infoLine = 0;
	//First letter of a file output.
	char firstLetter;
	//Last letter of a file output.
	char lastLetter;

	//Concatenate filepath with pid and status file to get full filepath.	
	strncat(filePath, pid, BUF_SIZE);
	strncat(filePath, "/stat", BUF_SIZE);

	//Open file, r means read only.
	file = fopen(filePath, "r");
	//Check if the file is open.
	if(file == NULL) {
		printf("File cannot be opened\n");
		exit(0);
	}
	
	//Read through the stat file and find the state data.
   	while(fscanf(file, "%s", nextWord) != EOF) {
        	if(infoLine == 2) {
			//Concatenate the data onto the result;
			strncat(result, nextWord, BUF_SIZE);
			strncat(result, " ", BUF_SIZE);
                	break;
        	}

		//Set variable to chack if its a name with two words.
		firstLetter = nextWord[0];
		lastLetter = nextWord[strlen(nextWord) - 1];
		if(firstLetter == '(' && lastLetter != ')') {

		} else {
        		infoLine++;
		}
	}

   	fclose(file);
}