Add cleaner ext2 filesystem implementation

Signed-off-by: Laurent Vivier <Laurent@vivier.eu>



git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@627 f158a5a8-5612-0410-a976-696ce0be7e32

fs/ext2/ext2_lseek.c

@@ -0,0 +1,38 @@
+/*
+ *
+ * (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
+ *
+ * This file has been copied from EMILE, http://emile.sf.net
+ *
+ */
+
+#include "libext2.h"
+#include "ext2.h"
+
+int ext2_lseek(ext2_FILE *file, long offset, int whence)
+{
+	long new_offset;
+
+	switch(whence)
+	{
+	case SEEK_SET:
+		new_offset = offset;
+		break;
+	case SEEK_CUR:
+		new_offset = file->offset + offset;
+		break;
+	case SEEK_END:
+		new_offset = file->inode->i_size + offset;
+		break;
+	default:
+		return -1;
+	}
+
+	if ( (new_offset < 0) ||
+	     (new_offset > file->inode->i_size) )
+		return -1;
+
+	file->offset = new_offset;
+
+	return new_offset;
+}