Many files:

  Checkin of e2fsprogs 0.5b

1 files changed, 95 insertions, 0 deletions

diff --git a/lib/ext2fs/bitops.c b/lib/ext2fs/bitops.c
new file mode 100644
index 00000000..a53d8ee8
--- /dev/null
+++ b/lib/ext2fs/bitops.c
@@ -0,0 +1,95 @@
+/*
+ * bitops.c --- Bitmap frobbing code.  See bitops.h for the inlined
+ * 	routines.
+ * 
+ * Copyright (C) 1993, 1994 Theodore Ts'o.  This file may be
+ * redistributed under the terms of the GNU Public License.
+ * 
+ * Taken from <asm/bitops.h>, Copyright 1992, Linus Torvalds.
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <linux/fs.h>
+#include <linux/ext2_fs.h>
+
+#include "ext2fs.h"
+
+#if (!defined(__i386__) && !defined(__i486__) && !defined(__i586__))
+
+/*
+ * For the benefit of those who are trying to port Linux to another
+ * architecture, here are some C-language equivalents.  You should
+ * recode these in the native assmebly language, if at all possible.
+ * To guarantee atomicity, these routines call cli() and sti() to
+ * disable interrupts while they operate.  (You have to provide inline
+ * routines to cli() and sti().)
+ *
+ * Also note, these routines assume that you have 32 bit integers.
+ * You will have to change this if you are trying to port Linux to the
+ * Alpha architecture or to a Cray.  :-)
+ * 
+ * C language equivalents written by Theodore Ts'o, 9/26/92
+ */
+
+int set_bit(int nr,void * addr)
+{
+	int	mask, retval;
+	int	*ADDR = (int *) addr;
+
+	ADDR += nr >> 5;
+	mask = 1 << (nr & 0x1f);
+	cli();
+	retval = (mask & *ADDR) != 0;
+	*ADDR |= mask;
+	sti();
+	return retval;
+}
+
+int clear_bit(int nr, void * addr)
+{
+	int	mask, retval;
+	int	*ADDR = (int *) addr;
+
+	ADDR += nr >> 5;
+	mask = 1 << (nr & 0x1f);
+	cli();
+	retval = (mask & *ADDR) != 0;
+	*ADDR &= ~mask;
+	sti();
+	return retval;
+}
+
+int test_bit(int nr, const void * addr)
+{
+	int		mask;
+	const int	*ADDR = (const int *) addr;
+
+	ADDR += nr >> 5;
+	mask = 1 << (nr & 0x1f);
+	return ((mask & *ADDR) != 0);
+}
+#endif	/* !i386 */
+
+/*
+ * These are routines print warning messages; they are called by
+ * inline routines.
+ */
+const char *ext2fs_block_string = "block";
+const char *ext2fs_inode_string = "inode";
+const char *ext2fs_mark_string = "mark";
+const char *ext2fs_unmark_string = "unmark";
+const char *ext2fs_test_string = "test";
+
+void ext2fs_warn_bitmap(ext2_filsys fs, const char *op, const char *type,
+			int arg)
+{
+	char	func[80];
+
+	sprintf(func, "ext2fs_%s_%s_bitmap", op, type);
+	com_err(func, 0, "INTERNAL ERROR: illegal %s #%d for %s",
+		type, arg, fs->device_name);
+}
+
+
+