1 files changed, 98 insertions, 0 deletions
diff --git a/usr.bin/systat/convtbl.c b/usr.bin/systat/convtbl.c
new file mode 100644
index 000000000000..fe3cd245d810
--- /dev/null
+++ b/usr.bin/systat/convtbl.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2003, Trent Nelson, <trent@arpa.com>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <unistd.h>
+#include "convtbl.h"
+
+struct	convtbl convtbl[] = {
+	/* mul, scale, str */
+	{ BYTE, BYTES, "bytes" },	/* SC_BYTE	(0) */
+	{ BYTE, KILO, "KB" },		/* SC_KILOBYTE	(1) */
+	{ BYTE, MEGA, "MB" },		/* SC_MEGABYTE	(2) */
+	{ BYTE, GIGA, "GB" },		/* SC_GIGABYTE	(3) */
+
+	{ BIT, BITS, "b" },		/* SC_BITS	(4) */
+	{ BIT, KILO, "Kb" },		/* SC_KILOBITS	(5) */
+	{ BIT, MEGA, "Mb" },		/* SC_MEGABITS	(6) */
+	{ BIT, GIGA, "Gb" },		/* SC_GIGABITS	(7) */
+
+	{ 0, 0, "" }			/* SC_AUTO	(8) */
+
+};
+
+
+static __inline__
+struct convtbl *
+get_tbl_ptr(const u_long size, const u_int scale)
+{
+	struct	convtbl *tbl_ptr = NULL;
+	u_long	tmp = 0;
+	u_int	index = scale;
+
+	/* If our index is out of range, default to auto-scaling. */
+	if (index > SC_AUTO)
+		index = SC_AUTO;
+
+	if (index == SC_AUTO)
+		/*
+		 * Simple but elegant algorithm.  Count how many times
+		 * we can shift our size value right by a factor of ten,
+		 * incrementing an index each time.  We then use the
+		 * index as the array index into the conversion table.
+		 */
+		for (tmp = size, index = SC_KILOBYTE;
+		     tmp >= MEGA && index <= SC_GIGABYTE;
+		     tmp >>= 10, index++);
+
+	tbl_ptr = &convtbl[index];
+	return tbl_ptr;
+}
+
+double
+convert(const u_long size, const u_int scale)
+{
+	struct	convtbl	*tp = NULL;
+
+	tp = get_tbl_ptr(size, scale);
+
+	return ((double)size * tp->mul / tp->scale);
+
+}
+
+char *
+get_string(const u_long size, const u_int scale)
+{
+	struct	convtbl *tp = NULL;
+
+	tp = get_tbl_ptr(size, scale);
+
+	return tp->str;
+}