From d16925e3b7910735586a36d6f197f624783dbfd3 Mon Sep 17 00:00:00 2001
From: Seppia <nonso@insicuri.net>
Date: Thu, 9 Jun 2016 17:16:10 +0200
Subject: added option and help to code

---
 onetimebluh.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 63 insertions(+), 10 deletions(-)

diff --git a/onetimebluh.c b/onetimebluh.c
index f838db3..b8f3f8c 100644
--- a/onetimebluh.c
+++ b/onetimebluh.c
@@ -1,22 +1,75 @@
 #include<stdio.h>
 #include<stdlib.h>
+#include<unistd.h>
+
+void xor(int ac, char* av[]);
+void help(char* av[]);
 
 int main(int argc, char* argv[]) {
-	FILE* uno = fopen(argv[1], "r");
-	FILE* due = fopen(argv[2], "r");
-	FILE* tre = fopen(argv[3], "w");
+	if (atoi(argv[1]) == 1){
+		xor(argc, argv);
+		printf("Message successfully encrypted! \n");
+	} else if (atoi(argv[1]) == 2) {
+		printf("Working \n");
+	} else {
+		printf("WARNING no command specified!! \n");
+		help(argv);
+		fprintf(stderr,"Exiting... \n");
+		exit(EXIT_FAILURE);
+	}
+
+	exit(EXIT_SUCCESS);
+}
+
+void xor(int ac, char* av[]) {
+
+	int opt;
+	int defout = 0;
+	char* output;
+	while ((opt = getopt(ac, av, "o:")) != -1) {
+		switch (opt) {
+		case 'o':
+			output = av[(optind-1)];
+			defout = 1;
+			break;
+		default:
+			fprintf(stderr,"Usage %s %s [-o output] \n", av[0], av[1]);
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	if (defout == 0) {
+		printf("WARNING no command specified using default value critt \n");
+		output = "critt";
+	}
+	FILE* mess_uno = fopen(av[2], "r");
+	FILE* mess_due = fopen(av[3], "r");
+	FILE* critt = fopen(output, "w");
 	int i = 1;
 	char a, b;
 	while(i != EOF) {
-		i = fscanf(uno, "%c", &a);
-		fscanf(due, "%c", &b);
+		i = fscanf(mess_uno, "%c", &a);
+		fscanf(mess_due, "%c", &b);
 		if(i != EOF) {
-			fprintf(tre, "%c", a^b);
+			fprintf(critt, "%c", a^b);
 		}
 	}
-	fclose(uno);
-	fclose(due);
-	fclose(tre);
+	fclose(mess_uno);
+	fclose(mess_due);
+	fclose(critt);
+
+	return;
+}
+
+void help(char* av[]) {
+	printf("ONETIMEBLUH USAGE: \n");
+	printf("%s [COMMAND] [OPTIONS] \n \n", av[0]);
+	printf("COMMANDS: \n");
+	printf("1 -> encrypt	encrypt message (argv[1]) using key (argv[2]) \n");
+	printf("2 -> keygen	create key file \n \n");
+	printf("OPTIONS \n");
+	printf("-b		number of bytes \n");
+	printf("-o		output name \n");
 
-	return 0;
+	return;
 }
-- 
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