109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/* $NetBSD: subr_humanize.c,v 1.1 2009/10/02 15:48:41 pooka Exp $ */
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/*-
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* Copyright (c) 1997, 1998, 1999, 2002, 2007, 2008 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 Luke Mewburn.
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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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*
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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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__KERNEL_RCSID(0, "$NetBSD: subr_humanize.c,v 1.1 2009/10/02 15:48:41 pooka Exp $");
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#include <sys/types.h>
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#include <sys/systm.h>
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/*
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* snprintf() `bytes' into `buf', reformatting it so that the number,
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* plus a possible `x' + suffix extension) fits into len bytes (including
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* the terminating NUL).
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* Returns the number of bytes stored in buf, or -1 if there was a problem.
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* E.g, given a len of 9 and a suffix of `B':
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* bytes result
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* ----- ------
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* 99999 `99999 B'
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* 100000 `97 kB'
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* 66715648 `65152 kB'
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* 252215296 `240 MB'
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*/
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int
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humanize_number(char *buf, size_t len, uint64_t bytes, const char *suffix,
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int divisor)
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{
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/* prefixes are: (none), kilo, Mega, Giga, Tera, Peta, Exa */
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const char *prefixes;
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int r;
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uint64_t umax;
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size_t i, suffixlen;
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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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suffixlen = strlen(suffix);
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/* check if enough room for `x y' + suffix + `\0' */
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if (len < 4 + suffixlen)
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return (-1);
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if (divisor == 1024) {
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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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prefixes = " KMGTPE";
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} else
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prefixes = " kMGTPE"; /* SI for decimal multiplies */
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umax = 1;
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for (i = 0; i < len - suffixlen - 3; i++) {
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umax *= 10;
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if (umax > bytes)
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break;
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}
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for (i = 0; bytes >= umax && prefixes[i + 1]; i++)
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bytes /= divisor;
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r = snprintf(buf, len, "%qu%s%c%s", (unsigned long long)bytes,
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i == 0 ? "" : " ", prefixes[i], suffix);
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return (r);
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}
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int
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format_bytes(char *buf, size_t len, uint64_t bytes)
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{
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int rv;
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size_t nlen;
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rv = humanize_number(buf, len, bytes, "B", 1024);
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if (rv != -1) {
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/* nuke the trailing ` B' if it exists */
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nlen = strlen(buf) - 2;
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if (strcmp(&buf[nlen], " B") == 0)
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buf[nlen] = '\0';
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}
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return (rv);
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}
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