1 files changed, 160 insertions, 0 deletions

diff --git a/lib/libutil/humanize_number.c b/lib/libutil/humanize_number.c
new file mode 100644
index 000000000000..51bd24bb20d6
--- /dev/null
+++ b/lib/libutil/humanize_number.c
@@ -0,0 +1,160 @@
+/*	$NetBSD: humanize_number.c,v 1.5 2003/12/26 11:30:36 simonb Exp $	*/
+
+/*
+ * Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+ * NASA Ames Research Center, by Luke Mewburn and by Tomas Svensson.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <locale.h>
+#include <libutil.h>
+
+int
+humanize_number(char *buf, size_t len, int64_t bytes,
+    const char *suffix, int scale, int flags)
+{
+	const char *prefixes;
+	int	i, r;
+	int64_t	divisor, max, s1, s2, sign;
+	size_t	baselen, suffixlen;
+
+	assert(buf != NULL);
+	assert(suffix != NULL);
+	assert(scale >= 0);
+
+	if (flags & HN_DIVISOR_1000) {
+		/* SI for decimal multiplies */
+		divisor = 1000;
+		prefixes = " kMGTPE";
+	} else {
+		/*
+		 * binary multiplies
+		 * XXX IEC 60027-2 recommends Ki, Mi, Gi...
+		 */
+		divisor = 1024;
+		prefixes = " KMGTPE";
+	}
+
+	if ((size_t) scale >= strlen(prefixes) && scale != HN_AUTOSCALE &&
+	    scale != HN_GETSCALE)
+		return (-1);
+
+	if (buf == NULL || suffix == NULL)
+		return (-1);
+
+	if (len > 0)
+		buf[0] = '\0';
+	if (bytes < 0) {
+		sign = -1;
+		bytes *= -100;
+		baselen = 4;
+	} else {
+		sign = 1;
+		bytes *= 100;
+		baselen = 3;
+	}
+
+	suffixlen = strlen(suffix);
+
+	/* check if enough room for `x y' + suffix + `\0' */
+	if (len < baselen + suffixlen + 1)
+		return (-1);
+
+	if (flags & HN_DIVISOR_1000)
+		divisor = 1000;
+	else
+		divisor = 1024;
+
+	max = 100;
+	for (i = 0;
+	     (size_t) i < len - suffixlen - baselen + ((flags & HN_NOSPACE) ?
+	     1 : 0); i++)
+		max *= 10;
+
+	if ((scale & HN_AUTOSCALE) || (scale & HN_GETSCALE)) {
+		for (i = 0; bytes >= max && prefixes[i + 1]; i++)
+			bytes /= divisor;
+	} else {
+		for (i = 0; i < scale && prefixes[i + 1]; i++)
+			bytes /= divisor;
+	}
+
+	if (scale & HN_GETSCALE)
+		return (i);
+
+	if (bytes < 1000 && flags & HN_DECIMAL) {
+		if (len < (baselen + 2 + ((flags & HN_NOSPACE) || (i == 0 &&
+		    !(flags & HN_B)) ? 0 : 1)))
+			return (-1);
+		s1 = bytes / 100;
+		if ((s2 = (((bytes % 100) + 5) / 10)) == 10) {
+			s1++;
+			s2 = 0;
+		}
+		if (s1 < 10 && i == 0)
+			/* Don't ever use .0 for a number less than 10. */
+			r = snprintf(buf, len, "%lld%s%c%s",
+			    /* LONGLONG */
+			    (long long)(sign * s1),
+			    (i == 0 && !(flags & HN_B)) || flags & HN_NOSPACE ?
+			    "" : " ", (i == 0 && (flags & HN_B)) ? 'B' :
+			    prefixes[i], suffix);
+		else
+			r = snprintf(buf, len, "%lld%s%lld%s%c%s",
+			    /* LONGLONG */
+			    (long long)(sign * s1),
+			    localeconv()->decimal_point,
+			    /* LONGLONG */
+			    (long long)s2,
+			    (i == 0 && !(flags & HN_B)) || flags & HN_NOSPACE ?
+			    "" : " ", (i == 0 && (flags & HN_B)) ? 'B' :
+			    prefixes[i], suffix);
+
+	} else
+		r = snprintf(buf, len, "%lld%s%c%s",
+		    /* LONGLONG */
+		    (long long)(sign * ((bytes + 50) / 100)),
+		    i == 0 || flags & HN_NOSPACE ? "" : " ", (i == 0 &&
+		    (flags & HN_B)) ? 'B' : prefixes[i], suffix);
+
+	return (r);
+}