fgets: avoid arithmetic overflow when n==INT_MIN is passed

[musl] / include / string.h

diff --git a/include/string.h b/include/string.h
index 795a2ab..43ad094 100644 (file)
--- a/include/string.h
+++ b/include/string.h
@@ -7,7 +7,9 @@ extern "C" {
 
 #include <features.h>
 
-#ifdef __cplusplus
+#if __cplusplus >= 201103L
+#define NULL nullptr
+#elif defined(__cplusplus)
 #define NULL 0L
 #else
 #define NULL ((void*)0)