From 9b800a19f73321a33b5eef340ea8ab5899b54bcb Mon Sep 17 00:00:00 2001
From: Kawe Mazidjatari <48657826+Mauler125@users.noreply.github.com>
Date: Wed, 7 Feb 2024 14:30:37 +0100
Subject: [PATCH] Tier1: optimize V_UnqualifiedFileName()

If we are going to do a strlen, then check the chars from the start
---
 src/tier1/strtools.cpp | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/tier1/strtools.cpp b/src/tier1/strtools.cpp
index 4e7b5527..0aed46ae 100644
--- a/src/tier1/strtools.cpp
+++ b/src/tier1/strtools.cpp
@@ -1105,14 +1105,21 @@ size_t V_StripLastDir(char* dirName, size_t maxLen)
 //-----------------------------------------------------------------------------
 const char* V_UnqualifiedFileName(const char* in)
 {
-	if (!in || !in[0])
-		return in;
+	Assert(in);
+
+	const char* out = in;
+
+	while (*in)
+	{
+		if (PATHSEPARATOR(*in))
+		{
+			// +1 to skip the slash
+			out = in + 1;;
+		}
+
+		in++;
+	}
 
-	// back up until the character after the first path separator we find,
-	// or the beginning of the string
-	const char* out = in + strlen(in) - 1;
-	while ((out > in) && (!PATHSEPARATOR(*(out - 1))))
-		out--;
 	return out;
 }