MIT-Curricular/OS/C/Week5/q2.c

// stdlib import
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// bash utilities import
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

void main () {

	// array declaration
	char *strings[5];
	char *string_cpy[5];
	char temp[100];

	// variables reqd
	int i,j;
	pid_t pid;
	int status;

	// input
	printf("Enter strings to print: \n");
	const size_t str_size = 100;
	for (i = 0; i < 5; i++) {
		strings[i] = malloc(str_size);
		string_cpy[i] = malloc(str_size);
		if (!strings[i] || !string_cpy[i]) {
			fprintf(stderr, "Memory allocation failed\n");
			exit(1);
		}
		if (fgets(strings[i], str_size, stdin)) {
			memcpy(string_cpy[i], strings[i], str_size);
		}
	}

	// forking
	pid = fork();

	// child process
	if (pid == 0) {
		printf("\n Child Process: \n");
		for (i = 0; i < 5; i++) {
			for (j = 0; j < 5 - i - 1; j++) {
				if (strcmp(strings[j], strings[j + 1]) > 0){
					strcpy(temp, strings[j]);
					strcpy(strings[j], strings[j+1]);
					strcpy(strings[j+1], temp);
				}
			}
		}


		for (i = 0; i < 5; i++) {
			printf("\n Child: %s \n", strings[i]);
		}

		printf("\n");
		exit (00);

	// parent process
	} else if (pid > 0) {
		wait(&status);
		printf("\n Parent Process: \n");
		for (i = 0; i < 5; i++) {
			printf("\n Parent: %s \n", string_cpy[i]);
			printf("%d",WEXITSTATUS(status));
		}

	// exception handling (catchall statement)
	} else {
		printf("THE SYSTEM ENCOUNTERED AN ERROR. Please try again later or debug the code. \n");
	}

}