From 7809185daad445d45456475680263626baa04992 Mon Sep 17 00:00:00 2001
From: Doyle Thai <doyleqnt@gmail.com>
Date: Sat, 6 Jan 2018 16:53:53 +1100
Subject: [PATCH] Fix string append crash on 0 len

---
 dqn.h             | 4 ++++
 dqn_unit_test.cpp | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/dqn.h b/dqn.h
index f367c1d..ed94b33 100644
--- a/dqn.h
+++ b/dqn.h
@@ -5456,6 +5456,10 @@ bool DqnString::Expand(const i32 newMax)
 DQN_FILE_SCOPE bool DqnStringInternal_Append(DqnString *const str, char const *const cstr,
                                              i32 const bytesToCopy)
 {
+	if (bytesToCopy <= 0)
+	{
+		return true;
+	}
 
 	// Check and reserve space if needed
 	i32 totalLen = str->len + bytesToCopy;
diff --git a/dqn_unit_test.cpp b/dqn_unit_test.cpp
index cc0831c..127b2fa 100644
--- a/dqn_unit_test.cpp
+++ b/dqn_unit_test.cpp
@@ -605,7 +605,7 @@ void DqnString_Test()
 		char *literal = "this is a literal string";
 		DqnString str = {};
 		DQN_ASSERT(str.InitLiteralNoAlloc(literal));
-		DQN_ASSERT(str.Append(", hello again")     == false);
+		DQN_ASSERT(str.Append(", hello again") == false);
 		str.Free();
 		LogSuccess("DqnString(): Try init literl no alloc, no further expansion");
 	}