From 4a5bc41e8911b129857f0abb0161b025453c57a6 Mon Sep 17 00:00:00 2001
From: Gabi Melman <gmelman1@gmail.com>
Date: Sun, 14 Feb 2021 00:20:44 +0200
Subject: [PATCH] Validate range in wincolor_sink::print_range_

---
 include/spdlog/sinks/wincolor_sink-inl.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/spdlog/sinks/wincolor_sink-inl.h b/include/spdlog/sinks/wincolor_sink-inl.h
index 21abca43..8324756b 100644
--- a/include/spdlog/sinks/wincolor_sink-inl.h
+++ b/include/spdlog/sinks/wincolor_sink-inl.h
@@ -144,9 +144,12 @@ std::uint16_t SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_foreground_color_(s
 template<typename ConsoleMutex>
 void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::print_range_(const memory_buf_t &formatted, size_t start, size_t end)
 {
-    auto size = static_cast<DWORD>(end - start);
-    auto ignored = ::WriteConsoleA(static_cast<HANDLE>(out_handle_), formatted.data() + start, size, nullptr, nullptr);
-    (void)(ignored);
+    if (end > start)
+    {
+        auto size = static_cast<DWORD>(end - start);
+        auto ignored = ::WriteConsoleA(static_cast<HANDLE>(out_handle_), formatted.data() + start, size, nullptr, nullptr);
+        (void)(ignored);
+    }
 }
 
 template<typename ConsoleMutex>