From 7cbae5d7e6d3b3630af4eebf230dbdf83f89cbbb Mon Sep 17 00:00:00 2001
From: Jonathan Lamothe <jonathan@jlamothe.net>
Date: Mon, 2 Sep 2013 08:05:13 -0400
Subject: [PATCH] make sure an input file is specified

---
 undpu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/undpu.c b/undpu.c
index 6cd3ce6..6aa532a 100755
--- a/undpu.c
+++ b/undpu.c
@@ -9,6 +9,10 @@ int main (int argc, char **argv){
 	FILE *bob, *joe;
 	int factor, thing, i;
 	char output[FILENAME_MAX];
+	if(argc < 2){
+		fputs("I pity the fool who don't have an input file!\n",stderr);
+		return EXIT_FAILURE;
+	}
 	if((bob = fopen(argv[1],"r"))==NULL){
 		fputs("That's no input file, THAT'S A SPACE STATION!\n",stderr);
 		return EXIT_FAILURE;