From f1d6b50ac5a014a5cd87a605bd4f4e1e6342ef7d Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Tue, 14 Aug 2007 14:37:22 +0000
Subject: Fixed a crash in the FString::prepend function on a null string
 corner case. Also added more tests to the FString unit tests and switched the
 ParamProc to using FString instead of std::string, this will break a few
 programs in very minor ways, a few seconds each to fix, I'd say.

---
 src/fstring.h        |  7 +++++++
 src/paramproc.cpp    |  4 ++--
 src/paramproc.h      |  4 ++--
 src/unit/fstring.cpp | 13 +++++++++++++
 4 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/src/fstring.h b/src/fstring.h
index 3cf42ef..63e1e1a 100644
--- a/src/fstring.h
+++ b/src/fstring.h
@@ -183,6 +183,8 @@ namespace Bu
 		 */
 		void prepend( const chr *pData )
 		{
+			if( pData == NULL )
+				return;
 			long nLen;
 			for( nLen = 0; pData[nLen] != (chr)0; nLen++ );
 			
@@ -261,6 +263,7 @@ namespace Bu
 				return NULL;
 
 			flatten();
+			pFirst->pData[nLength] = (chr)0;
 			return pFirst->pData;
 		}
 		
@@ -274,6 +277,7 @@ namespace Bu
 				return NULL;
 
 			flatten();
+			pFirst->pData[nLength] = (chr)0;
 			return pFirst->pData;
 		}
 
@@ -287,6 +291,7 @@ namespace Bu
 				return NULL;
 
 			flatten();
+			pFirst->pData[nLength] = (chr)0;
 			return pFirst->pData;
 		}
 		
@@ -300,6 +305,7 @@ namespace Bu
 				return NULL;
 
 			flatten();
+			pFirst->pData[nLength] = (chr)0;
 			return pFirst->pData;
 		}
 
@@ -416,6 +422,7 @@ namespace Bu
 			}
 
 			flatten();
+			pFirst->pData[nLength] = (chr)0;
 			const chr *a = pData;
 			chr *b = pFirst->pData;
 			for( long j = 0; *a!=(chr)0 || *b!=(chr)0; j++, a++, b++ )
diff --git a/src/paramproc.cpp b/src/paramproc.cpp
index 34e973e..67ef44b 100644
--- a/src/paramproc.cpp
+++ b/src/paramproc.cpp
@@ -11,7 +11,7 @@ Bu::ParamProc::ParamPtr::ParamPtr()
 	type = vtunset;
 }
 
-ptrtype( std::string, str     );
+ptrtype( Bu::FString, str     );
 ptrtype( uint64_t,    uint64  );
 ptrtype( uint32_t,    uint32  );
 ptrtype( uint16_t,    uint16  );
@@ -481,7 +481,7 @@ int Bu::ParamProc::help( int argc, char *argv[] )
 		if( (*i)->sWord.getStr() )
 		{
 			printf("--");
-			std::string sTmp = (*i)->sWord.getStr();
+			Bu::FString sTmp = (*i)->sWord.getStr();
 			if( (*i)->sExtra.getStr() )
 				sTmp += (*i)->sExtra.getStr();
 			printf( fmt, sTmp.c_str() );
diff --git a/src/paramproc.h b/src/paramproc.h
index 2bca588..a48de5d 100644
--- a/src/paramproc.h
+++ b/src/paramproc.h
@@ -15,7 +15,7 @@ namespace Bu
 		{
 		public:
 			ParamPtr();
-			ParamPtr( std::string *str );
+			ParamPtr( Bu::FString *str );
 			ParamPtr( uint64_t    *uint64  );
 			ParamPtr( uint32_t    *uint32  );
 			ParamPtr( uint16_t    *uint16  );
@@ -55,7 +55,7 @@ namespace Bu
 			int type;
 			union
 			{
-				std::string *str;
+				Bu::FString *str;
 				uint64_t *uint64;
 				uint32_t *uint32;
 				uint16_t *uint16;
diff --git a/src/unit/fstring.cpp b/src/unit/fstring.cpp
index 462ce5e..2044a86 100644
--- a/src/unit/fstring.cpp
+++ b/src/unit/fstring.cpp
@@ -10,6 +10,7 @@ public:
 		addTest( Unit::compare1 );
 		addTest( Unit::compare2 );
 		addTest( Unit::appendSingle );
+		addTest( Unit::shared1 );
 	}
 
 	virtual ~Unit()
@@ -36,6 +37,18 @@ public:
 		for( char l = 'a'; l < 'g'; l++ )
 			b += l;
 		unitTest( b == "abcdef" );
+		unitTest( strcmp( b.getStr(), "abcdef" ) == 0 );
+	}
+
+	void shared1()
+	{
+		Bu::FString a("Hey there");
+		Bu::FString b( a );
+		unitTest( a.getStr() == b.getStr() );
+		b += " guy";
+		unitTest( a.getStr() != b.getStr() );
+		a = b;
+		unitTest( a.getStr() == b.getStr() );
 	}
 };
 
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