added input file existance check in function xor

1 files changed, 13 insertions, 4 deletions

diff --git a/onetimebluh.c b/onetimebluh.c
index 3516cd3..e6366f0 100644
--- a/onetimebluh.c
+++ b/onetimebluh.c
@@ -1,7 +1,10 @@
-#include<stdio.h>
-#include<stdlib.h>
-#include<getopt.h>
-#include<openssl/rand.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <openssl/rand.h>
+#include <unistd.h>
+#include <errno.h>
+#include <error.h>
 
 void xor(char* mess, char* keyf, char* outp);
 void keyrand(int nb, char* outp);
@@ -91,6 +94,12 @@ void xor(char* mess, char* keyf, char* outp) {
 
 	char* defoutp = "critt";
 
+	if (access(mess, F_OK) == -1) {
+		error(errno, errno, mess);
+	} else if (access(keyf, F_OK) == -1) {
+		error(errno, errno, keyf);
+	}
+
 	if (outp == NULL) {
 		printf("WARNING no output name specified using default value 'critt' \n");
 		outp = defoutp;