From 25926c6206a47ffb5cbfb3702e2df22038176205 Mon Sep 17 00:00:00 2001
From: Arseny Kapoulkine <arseny.kapoulkine@gmail.com>
Date: Sat, 1 Nov 2014 10:44:56 +0100
Subject: XPath: Fix undefined behavior while calling memcpy

Calling memcpy(x, 0, 0) is technically undefined (although it should usually
be a no-op).

Fixes #20.
---
 src/pugixml.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/pugixml.cpp b/src/pugixml.cpp
index b39aad0..4b1d5ab 100644
--- a/src/pugixml.cpp
+++ b/src/pugixml.cpp
@@ -7764,6 +7764,8 @@ PUGI__NS_BEGIN
 
 		void append(const xpath_node* begin_, const xpath_node* end_, xpath_allocator* alloc)
 		{
+			if (begin_ == end_) return;
+
 			size_t size_ = static_cast<size_t>(_end - _begin);
 			size_t capacity = static_cast<size_t>(_eos - _begin);
 			size_t count = static_cast<size_t>(end_ - begin_);
-- 
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