From cffa206680a850a0518914cb193f5f908f13d854 Mon Sep 17 00:00:00 2001
From: Ulf Wohlers <finsterr@users.sourceforge.net>
Date: Tue, 25 Feb 2003 13:28:42 +0000
Subject: [PATCH] Improved search for free dir id

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@693
---
 src/dos/drive_cache.cpp | 11 +++++++----
 src/dos/drives.h        |  3 ++-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/dos/drive_cache.cpp b/src/dos/drive_cache.cpp
index 73b4d9c9..f277f6ba 100644
--- a/src/dos/drive_cache.cpp
+++ b/src/dos/drive_cache.cpp
@@ -78,9 +78,9 @@ DOS_Drive_Cache::~DOS_Drive_Cache(void)
 	for (Bit32u i=0; i<MAX_OPENDIRS; i++) dirSearch[i] = 0;
 };
 
-Bit16u DOS_Drive_Cache::GetFreeID(void)
+Bit16u DOS_Drive_Cache::GetFreeID(CFileInfo* dir)
 {
-	for (Bit32u i=0; i<MAX_OPENDIRS; i++) if (free[i]) return i;
+	for (Bit32u i=0; i<MAX_OPENDIRS; i++) if (free[i] || (dir==dirSearch[i])) return i;
 	LOG_ERROR("DIRCACHE: Too many open directorys!");
 	return 0;
 };
@@ -464,7 +464,7 @@ bool DOS_Drive_Cache::OpenDir(const char* path, Bit16u& id)
 
 bool DOS_Drive_Cache::OpenDir(CFileInfo* dir, char* expand, Bit16u& id)
 {
-	id = GetFreeID();
+	id = GetFreeID(dir);
 	dirSearch[id] = dir;
 	// Add "/"
 	char end[2]={CROSS_FILESPLIT,0};
@@ -511,7 +511,10 @@ bool DOS_Drive_Cache::ReadDir(Bit16u id, struct dirent* &result)
 	if (!IsCachedIn(dirSearch[id])) {
 		// Try to open directory
 		DIR* dirp = opendir(dirPath);
-		if (!dirp) return false;
+		if (!dirp) {
+			free[id] = true;
+			return false;
+		}
 		// Read complete directory
 		struct dirent* tmpres;
 		while (tmpres = readdir(dirp)) {			
diff --git a/src/dos/drives.h b/src/dos/drives.h
index 92d5f034..cdadcc9e 100644
--- a/src/dos/drives.h
+++ b/src/dos/drives.h
@@ -81,7 +81,8 @@ private:
 	bool		RemoveSpaces		(char* str);
 	bool		OpenDir				(CFileInfo* dir, char* path, Bit16u& id);
 	void		CreateEntry			(CFileInfo* dir, const char* name);
-	Bit16u		GetFreeID			(void);
+	Bit16u		GetFreeID			(CFileInfo* dir);
+
 
 	CFileInfo*	dirBase;
 	char		dirPath				[CROSS_LEN];