mtools-4.0.18HEADmtools-4.0.18master

1 files changed, 79 insertions, 0 deletions

diff --git a/streamcache.c b/streamcache.c
new file mode 100644
index 0000000..4277ef0
--- /dev/null
+++ b/streamcache.c
@@ -0,0 +1,79 @@
+/*  Copyright 1996,1997,2001,2002,2007,2009 Alain Knaff.
+ *  This file is part of mtools.
+ *
+ *  Mtools is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Mtools is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Mtools.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * streamcache.c
+ * Managing a cache of open disks
+ */
+
+#include "sysincludes.h"
+#include "msdos.h"
+#include "mtools.h"
+#include "vfat.h"
+#include "fs.h"
+#include "mainloop.h"
+#include "plain_io.h"
+#include "file.h"
+
+static int is_initialized = 0;
+static Stream_t *fss[256]; /* open drives */
+
+static void finish_sc(void)
+{
+	int i;
+
+	for(i=0; i<256; i++){
+		if(fss[i] && fss[i]->refs != 1 )
+			fprintf(stderr,"Streamcache allocation problem:%c %d\n",
+				i, fss[i]->refs);
+		FREE(&(fss[i]));
+	}
+}
+
+static void init_streamcache(void)
+{
+	int i;
+
+	if(is_initialized)
+		return;
+	is_initialized = 1;
+	for(i=0; i<256; i++)
+		fss[i]=0;
+	atexit(finish_sc);
+}
+
+Stream_t *open_root_dir(unsigned char drive, int flags, int *isRop)
+{
+	Stream_t *Fs;
+
+	init_streamcache();
+
+	drive = toupper(drive);
+	
+	/* open the drive */
+	if(fss[drive])
+		Fs = fss[drive];
+	else {
+		Fs = fs_init(drive, flags, isRop);
+		if (!Fs){
+			fprintf(stderr, "Cannot initialize '%c:'\n", drive);
+			return NULL;
+		}
+
+		fss[drive] = Fs;
+	}
+
+	return OpenRoot(Fs);
+}