From aa84e2fc64bb778aabd7c4bdffede94d5b98f0ed Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Thu, 25 Apr 2019 14:07:17 +0200
Subject: fgrep: Don't repeat old incoming data if fgets() failed.

---
 Userland/fgrep.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'Userland/fgrep.cpp')

diff --git a/Userland/fgrep.cpp b/Userland/fgrep.cpp
index 2d9c7bc5ea..8916d1131a 100644
--- a/Userland/fgrep.cpp
+++ b/Userland/fgrep.cpp
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
+#include <assert.h>
 
 int main(int argc, char** argv)
 {
@@ -10,11 +11,12 @@ int main(int argc, char** argv)
     }
     for (;;) {
         char buf[4096];
-        fgets(buf, sizeof(buf), stdin);
-        if (strstr(buf, argv[1]))
+        auto* str = fgets(buf, sizeof(buf), stdin);
+        if (str && strstr(str, argv[1]))
             write(1, buf, strlen(buf));
         if (feof(stdin))
             return 0;
+        ASSERT(str);
     }
     return 0;
 }
-- 
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