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/* $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);
}
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