131 lines
3.8 KiB
Groff
131 lines
3.8 KiB
Groff
.\" $NetBSD: humanize_number.9,v 1.7 2005/12/26 19:48:12 perry Exp $
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.\"
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.\" Copyright (c) 1999 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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.\" 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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.Dd May 21, 1999
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.Dt HUMANIZE_NUMBER 9
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.Os
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.Sh NAME
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.Nm humanize_number ,
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.Nm format_bytes
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.Nd format a number into a human readable form
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.Sh SYNOPSIS
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.Ft int
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.Fo humanize_number
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.Fa "char *buf" "size_t len" "uint64_t number" "const char *suffix"
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.Fa "int divisor"
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.Fc
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.Ft int
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.Fn format_bytes "char *buf" "size_t len" "uint64_t number"
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.Sh DESCRIPTION
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.Ss humanize_number
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The
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.Fn humanize_number
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function formats the unsigned 64 bit quantity given in
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.Fa number
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into
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.Fa buffer .
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A space and then
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.Fa suffix
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is appended to the end.
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.Fa buffer
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must be at least
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.Fa len
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bytes long.
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.Pp
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If the formatted number (including
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.Fa suffix )
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would be too long to fit into
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.Fa buffer ,
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then divide
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.Fa number
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by
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.Fa divisor
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until it will.
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In this case, prefix
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.Fa suffix
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with the appropriate SI designator.
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Suitable values of
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.Fa divisor
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are 1024 or 1000 to remain consistent with the common meanings of the
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SI designator prefixes.
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.Pp
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The prefixes are:
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.Bl -column "Prefix" "Description" "Multiplier" -offset indent
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.It Sy "Prefix" Ta Sy "Description" Ta Sy "Multiplier"
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.It k kilo 1024
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.It M mega 1048576
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.It G giga 1073741824
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.It T tera 1099511627776
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.It P peta 1125899906842624
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.It E exa 1152921504606846976
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.El
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.Pp
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.Fa len
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must be at least 4 plus the length of
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.Fa suffix ,
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in order to ensure a useful result is generated into
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.Fa buffer .
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.Ss format_bytes
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The
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.Fn format_bytes
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function
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is a front-end to
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.Fn humanize_number
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that calls the latter with a
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.Fa suffix
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of
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.Dq B .
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Also, if the suffix in the returned
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.Fa buffer
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would not have a prefix, remove the suffix.
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This means that a result of
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.Dq 100000
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occurs, instead of
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.Dq 100000 B .
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.Sh RETURN VALUES
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.Fn humanize_number
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and
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.Fn format_bytes
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return the number of characters stored in
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.Fa buffer
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(excluding the terminating NUL) upon success, or \-1 upon failure.
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.Sh HISTORY
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.Fn humanize_number
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and
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.Fn format_bytes
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first appeared in
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.Nx 1.5 .
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