From 43dce73c81b60db010d1cd1768af60cbcaeacd1a Mon Sep 17 00:00:00 2001
From: Robby Zambito <contact@robbyzambito.me>
Date: Thu, 15 Dec 2022 13:08:16 -0500
Subject: [PATCH] CHECK YOUR INPUT IDIOT

---
 msh.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/msh.c b/msh.c
index 590a655..fe66427 100644
--- a/msh.c
+++ b/msh.c
@@ -318,7 +318,9 @@ int mathTest() {
 		#endif
 		printf("%d %c %d = ", num1, mathOperation[randProblem], num2);
 		numLine = readline("");
-		sscanf(numLine, "%ld", &numAnswer);
+		if (numLine != NULL && strlen(numLine) > 0) {
+		  sscanf(numLine, "%ld", &numAnswer);
+		}
 
 		if (numSolution != numAnswer) { // If wrong answer
 			status = 1;