157 lines
4.3 KiB
C
157 lines
4.3 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#include <math.h>
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#include <stdio.h>
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#include <libzutil.h>
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/*
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* Convert a number to an appropriately human-readable output.
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*/
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void
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zfs_nicenum_format(uint64_t num, char *buf, size_t buflen,
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enum zfs_nicenum_format format)
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{
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uint64_t n = num;
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int index = 0;
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const char *u;
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const char *units[3][7] = {
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[ZFS_NICENUM_1024] = {"", "K", "M", "G", "T", "P", "E"},
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[ZFS_NICENUM_BYTES] = {"B", "K", "M", "G", "T", "P", "E"},
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[ZFS_NICENUM_TIME] = {"ns", "us", "ms", "s", "?", "?", "?"}
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};
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const int units_len[] = {[ZFS_NICENUM_1024] = 6,
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[ZFS_NICENUM_BYTES] = 6,
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[ZFS_NICENUM_TIME] = 4};
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const int k_unit[] = { [ZFS_NICENUM_1024] = 1024,
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[ZFS_NICENUM_BYTES] = 1024,
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[ZFS_NICENUM_TIME] = 1000};
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double val;
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if (format == ZFS_NICENUM_RAW) {
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snprintf(buf, buflen, "%llu", (u_longlong_t)num);
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return;
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} else if (format == ZFS_NICENUM_RAWTIME && num > 0) {
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snprintf(buf, buflen, "%llu", (u_longlong_t)num);
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return;
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} else if (format == ZFS_NICENUM_RAWTIME && num == 0) {
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snprintf(buf, buflen, "%s", "-");
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return;
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}
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while (n >= k_unit[format] && index < units_len[format]) {
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n /= k_unit[format];
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index++;
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}
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u = units[format][index];
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/* Don't print zero latencies since they're invalid */
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if ((format == ZFS_NICENUM_TIME) && (num == 0)) {
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(void) snprintf(buf, buflen, "-");
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} else if ((index == 0) || ((num %
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(uint64_t)powl(k_unit[format], index)) == 0)) {
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/*
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* If this is an even multiple of the base, always display
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* without any decimal precision.
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*/
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(void) snprintf(buf, buflen, "%llu%s", (u_longlong_t)n, u);
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} else {
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/*
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* We want to choose a precision that reflects the best choice
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* for fitting in 5 characters. This can get rather tricky when
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* we have numbers that are very close to an order of magnitude.
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* For example, when displaying 10239 (which is really 9.999K),
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* we want only a single place of precision for 10.0K. We could
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* develop some complex heuristics for this, but it's much
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* easier just to try each combination in turn.
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*/
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int i;
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for (i = 2; i >= 0; i--) {
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val = (double)num /
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(uint64_t)powl(k_unit[format], index);
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/*
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* Don't print floating point values for time. Note,
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* we use floor() instead of round() here, since
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* round can result in undesirable results. For
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* example, if "num" is in the range of
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* 999500-999999, it will print out "1000us". This
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* doesn't happen if we use floor().
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*/
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if (format == ZFS_NICENUM_TIME) {
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if (snprintf(buf, buflen, "%d%s",
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(unsigned int) floor(val), u) <= 5)
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break;
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} else {
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if (snprintf(buf, buflen, "%.*f%s", i,
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val, u) <= 5)
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break;
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}
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}
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}
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}
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/*
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* Convert a number to an appropriately human-readable output.
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*/
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void
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zfs_nicenum(uint64_t num, char *buf, size_t buflen)
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{
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zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_1024);
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}
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/*
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* Convert a time to an appropriately human-readable output.
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* @num: Time in nanoseconds
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*/
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void
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zfs_nicetime(uint64_t num, char *buf, size_t buflen)
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{
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zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_TIME);
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}
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/*
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* Print out a raw number with correct column spacing
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*/
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void
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zfs_niceraw(uint64_t num, char *buf, size_t buflen)
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{
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zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_RAW);
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}
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/*
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* Convert a number of bytes to an appropriately human-readable output.
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*/
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void
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zfs_nicebytes(uint64_t num, char *buf, size_t buflen)
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{
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zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_BYTES);
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}
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