161 lines
4.8 KiB
C
161 lines
4.8 KiB
C
/* $NetBSD: humanize_number.c,v 1.5 2003/12/26 11:30:36 simonb Exp $ */
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/*
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* Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center, by Luke Mewburn and by Tomas Svensson.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <locale.h>
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#include <libutil.h>
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int
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humanize_number(char *buf, size_t len, int64_t bytes,
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const char *suffix, int scale, int flags)
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{
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const char *prefixes;
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int i, r;
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int64_t divisor, max, s1, s2, sign;
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size_t baselen, suffixlen;
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assert(buf != NULL);
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assert(suffix != NULL);
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assert(scale >= 0);
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if (flags & HN_DIVISOR_1000) {
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/* SI for decimal multiplies */
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divisor = 1000;
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prefixes = " kMGTPE";
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} else {
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/*
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* binary multiplies
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* XXX IEC 60027-2 recommends Ki, Mi, Gi...
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*/
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divisor = 1024;
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prefixes = " KMGTPE";
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}
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if ((size_t) scale >= strlen(prefixes) && scale != HN_AUTOSCALE &&
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scale != HN_GETSCALE)
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return (-1);
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if (buf == NULL || suffix == NULL)
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return (-1);
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if (len > 0)
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buf[0] = '\0';
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if (bytes < 0) {
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sign = -1;
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bytes *= -100;
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baselen = 4;
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} else {
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sign = 1;
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bytes *= 100;
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baselen = 3;
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}
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suffixlen = strlen(suffix);
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/* check if enough room for `x y' + suffix + `\0' */
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if (len < baselen + suffixlen + 1)
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return (-1);
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if (flags & HN_DIVISOR_1000)
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divisor = 1000;
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else
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divisor = 1024;
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max = 100;
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for (i = 0;
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(size_t) i < len - suffixlen - baselen + ((flags & HN_NOSPACE) ?
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1 : 0); i++)
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max *= 10;
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if ((scale & HN_AUTOSCALE) || (scale & HN_GETSCALE)) {
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for (i = 0; bytes >= max && prefixes[i + 1]; i++)
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bytes /= divisor;
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} else {
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for (i = 0; i < scale && prefixes[i + 1]; i++)
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bytes /= divisor;
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}
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if (scale & HN_GETSCALE)
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return (i);
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if (bytes < 1000 && flags & HN_DECIMAL) {
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if (len < (baselen + 2 + ((flags & HN_NOSPACE) || (i == 0 &&
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!(flags & HN_B)) ? 0 : 1)))
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return (-1);
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s1 = bytes / 100;
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if ((s2 = (((bytes % 100) + 5) / 10)) == 10) {
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s1++;
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s2 = 0;
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}
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if (s1 < 10 && i == 0)
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/* Don't ever use .0 for a number less than 10. */
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r = snprintf(buf, len, "%lld%s%c%s",
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/* LONGLONG */
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(long long)(sign * s1),
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(i == 0 && !(flags & HN_B)) || flags & HN_NOSPACE ?
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"" : " ", (i == 0 && (flags & HN_B)) ? 'B' :
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prefixes[i], suffix);
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else
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r = snprintf(buf, len, "%lld%s%lld%s%c%s",
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/* LONGLONG */
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(long long)(sign * s1),
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localeconv()->decimal_point,
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/* LONGLONG */
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(long long)s2,
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(i == 0 && !(flags & HN_B)) || flags & HN_NOSPACE ?
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"" : " ", (i == 0 && (flags & HN_B)) ? 'B' :
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prefixes[i], suffix);
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} else
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r = snprintf(buf, len, "%lld%s%c%s",
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/* LONGLONG */
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(long long)(sign * ((bytes + 50) / 100)),
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i == 0 || flags & HN_NOSPACE ? "" : " ", (i == 0 &&
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(flags & HN_B)) ? 'B' : prefixes[i], suffix);
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return (r);
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}
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