--- /dev/null
+/* $NetBSD: humanize_number.c,v 1.13 2007/12/14 17:26:19 christos 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: src/lib/libutil/humanize_number.c,v 1.2.10.1 2008/04/20 16:29:01 antoine Exp $");
+
+#include <sys/types.h>
+#include <assert.h>
+#include <inttypes.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, *sep;
+ int b, i, r, maxscale, s1, s2, sign;
+ int64_t divisor, max;
+ size_t baselen;
+
+ assert(buf != NULL);
+ assert(suffix != NULL);
+ assert(scale >= 0);
+
+ if (flags & HN_DIVISOR_1000) {
+ /* SI for decimal multiplies */
+ divisor = 1000;
+ if (flags & HN_B)
+ prefixes = "B\0k\0M\0G\0T\0P\0E";
+ else
+ prefixes = "\0\0k\0M\0G\0T\0P\0E";
+ } else {
+ /*
+ * binary multiplies
+ * XXX IEC 60027-2 recommends Ki, Mi, Gi...
+ */
+ divisor = 1024;
+ if (flags & HN_B)
+ prefixes = "B\0K\0M\0G\0T\0P\0E";
+ else
+ prefixes = "\0\0K\0M\0G\0T\0P\0E";
+ }
+
+#define SCALE2PREFIX(scale) (&prefixes[(scale) << 1])
+ maxscale = 7;
+
+ if (scale >= maxscale &&
+ (scale & (HN_AUTOSCALE | HN_GETSCALE)) == 0)
+ return (-1);
+
+ if (buf == NULL || suffix == NULL)
+ return (-1);
+
+ if (len > 0)
+ buf[0] = '\0';
+ if (bytes < 0) {
+ sign = -1;
+ bytes *= -100;
+ baselen = 3; /* sign, digit, prefix */
+ } else {
+ sign = 1;
+ bytes *= 100;
+ baselen = 2; /* digit, prefix */
+ }
+ if (flags & HN_NOSPACE)
+ sep = "";
+ else {
+ sep = " ";
+ baselen++;
+ }
+ baselen += strlen(suffix);
+
+ /* Check if enough room for `x y' + suffix + `\0' */
+ if (len < baselen + 1)
+ return (-1);
+
+ if (scale & (HN_AUTOSCALE | HN_GETSCALE)) {
+ /* See if there is additional columns can be used. */
+ for (max = 100, i = len - baselen; i-- > 0;)
+ max *= 10;
+
+ /*
+ * Divide the number until it fits the given column.
+ * If there will be an overflow by the rounding below,
+ * divide once more.
+ */
+ for (i = 0; bytes >= max - 50 && i < maxscale; i++)
+ bytes /= divisor;
+
+ if (scale & HN_GETSCALE)
+ return (i);
+ } else
+ for (i = 0; i < scale && i < maxscale; i++)
+ bytes /= divisor;
+
+ /* If a value <= 9.9 after rounding and ... */
+ if (bytes < 995 && i > 0 && flags & HN_DECIMAL) {
+ /* baselen + \0 + .N */
+ if (len < baselen + 1 + 2)
+ return (-1);
+ b = ((int)bytes + 5) / 10;
+ s1 = b / 10;
+ s2 = b % 10;
+ r = snprintf(buf, len, "%d%s%d%s%s%s",
+ sign * s1, ".", s2,
+ sep, SCALE2PREFIX(i), suffix);
+ } else
+ r = snprintf(buf, len, "%" PRId64 "%s%s%s",
+ sign * ((bytes + 50) / 100),
+ sep, SCALE2PREFIX(i), suffix);
+
+ return (r);
+}
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