From 696c6af588a4b1f326a7257ca0cdc1073eaedbb2 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <c.oelckers@zdoom.fake>
Date: Thu, 27 Aug 2015 12:48:43 +0200
Subject: [PATCH] - fixed: FString's 'Strip...' functions could crash on empty
 strings.

---
 src/zstring.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/zstring.cpp b/src/zstring.cpp
index 510ff19d7..1aa388da9 100644
--- a/src/zstring.cpp
+++ b/src/zstring.cpp
@@ -583,6 +583,7 @@ void FString::SwapCase ()
 void FString::StripLeft ()
 {
 	size_t max = Len(), i, j;
+	if (max == 0) return;
 	for (i = 0; i < max; ++i)
 	{
 		if (!isspace(Chars[i]))
@@ -613,6 +614,7 @@ void FString::StripLeft (const FString &charset)
 void FString::StripLeft (const char *charset)
 {
 	size_t max = Len(), i, j;
+	if (max == 0) return;
 	for (i = 0; i < max; ++i)
 	{
 		if (!strchr (charset, Chars[i]))
@@ -665,6 +667,7 @@ void FString::StripRight (const FString &charset)
 void FString::StripRight (const char *charset)
 {
 	size_t max = Len(), i;
+	if (max == 0) return;
 	for (i = max; i-- > 0; )
 	{
 		if (!strchr (charset, Chars[i]))
@@ -687,6 +690,7 @@ void FString::StripRight (const char *charset)
 void FString::StripLeftRight ()
 {
 	size_t max = Len(), i, j, k;
+	if (max == 0) return;
 	for (i = 0; i < max; ++i)
 	{
 		if (!isspace(Chars[i]))
@@ -723,6 +727,7 @@ void FString::StripLeftRight (const FString &charset)
 void FString::StripLeftRight (const char *charset)
 {
 	size_t max = Len(), i, j, k;
+	if (max == 0) return;
 	for (i = 0; i < max; ++i)
 	{
 		if (!strchr (charset, Chars[i]))