131 lines
3.8 KiB
Groff
131 lines
3.8 KiB
Groff
.\" $NetBSD: humanize_number.9,v 1.5 2002/09/26 15:06:06 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Luke Mewburn.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.Dd May 21, 1999
|
|
.Dt HUMANIZE_NUMBER 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm humanize_number ,
|
|
.Nm format_bytes
|
|
.Nd format a number into a human readable form
|
|
.Sh SYNOPSIS
|
|
.Ft int
|
|
.Fo humanize_number
|
|
.Fa "char *buf" "size_t len" "u_int64_t number" "const char *suffix"
|
|
.Fa "int divisor"
|
|
.Fc
|
|
.Ft int
|
|
.Fn format_bytes "char *buf" "size_t len" "u_int64_t number"
|
|
.Sh DESCRIPTION
|
|
.Ss humanize_number
|
|
The
|
|
.Fn humanize_number
|
|
function formats the unsigned 64 bit quantity given in
|
|
.Fa number
|
|
into
|
|
.Fa buffer .
|
|
A space and then
|
|
.Fa suffix
|
|
is appended to the end.
|
|
.Fa buffer
|
|
must be at least
|
|
.Fa len
|
|
bytes bytes long.
|
|
.Pp
|
|
If the formatted number (including
|
|
.Fa suffix )
|
|
would be too long to fit into
|
|
.Fa buffer ,
|
|
then divide
|
|
.Fa number
|
|
by
|
|
.Fa divisor
|
|
until it will.
|
|
In this case, prefix
|
|
.Fa suffix
|
|
with the appropriate SI designator.
|
|
Suitable values of
|
|
.Fa divisor
|
|
are 1024 or 1000 to remain consistent with the common meanings of the
|
|
SI designator prefixes.
|
|
.Pp
|
|
The prefixes are:
|
|
.Bl -column "Prefix" "Description" "Multiplier" -offset indent
|
|
.It Sy "Prefix" Ta Sy "Description" Ta Sy "Multiplier"
|
|
.It k kilo 1024
|
|
.It M mega 1048576
|
|
.It G giga 1073741824
|
|
.It T tera 1099511627776
|
|
.It P peta 1125899906842624
|
|
.It E exa 1152921504606846976
|
|
.El
|
|
.Pp
|
|
.Fa len
|
|
must be at least 4 plus the length of
|
|
.Fa suffix ,
|
|
in order to ensure a useful result is generated into
|
|
.Fa buffer .
|
|
.Ss format_bytes
|
|
The
|
|
.Fn format_bytes
|
|
function
|
|
is a front-end to
|
|
.Fn humanize_number
|
|
that calls the latter with a
|
|
.Fa suffix
|
|
of
|
|
.Dq B .
|
|
Also, if the suffix in the returned
|
|
.Fa buffer
|
|
would not have a prefix, remove the suffix.
|
|
This means that a result of
|
|
.Dq 100000
|
|
occurs, instead of
|
|
.Dq 100000 B .
|
|
.Sh RETURN VALUES
|
|
.Fn humanize_number
|
|
and
|
|
.Fn format_bytes
|
|
return the number of characters stored in
|
|
.Fa buffer
|
|
(excluding the terminating NUL) upon success, or \-1 upon failure.
|
|
.Sh HISTORY
|
|
.Fn humanize_number
|
|
and
|
|
.Fn format_bytes
|
|
first appeared in
|
|
.Nx 1.5 .
|