From ea9f60e32c3b4e6517cb865364f189e5abd872e6 Mon Sep 17 00:00:00 2001
From: Sandu Liviu Catalin <slc.universe@gmail.com>
Date: Sun, 3 Apr 2016 23:23:01 +0300
Subject: [PATCH] Fix a buffer underflow in the Center function from the string
 library.

---
 source/Library/String.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/source/Library/String.cpp b/source/Library/String.cpp
index 0b579eb8..40f54848 100644
--- a/source/Library/String.cpp
+++ b/source/Library/String.cpp
@@ -410,10 +410,12 @@ CSStr CenterStr(CSStr s, SQChar f, Uint32 w)
     {
         // Calculate the string length
         const Uint32 n = std::strlen(s);
+        // Calculate the insert position
+        const Int32 p = ((w/2) - (n/2));
         // Insert only the fill character first
         std::memset(b.Data(), f, w);
         // Overwrite with the specified string
-        std::strncpy(b.Data() + ((w/2) - (n/2)), s, n);
+        std::strncpy(b.Data() + (p < 0 ? 0 : p), s, n);
     }
     // End the resulted string
     b.At(w) = '\0';