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21f4052c5b
groff(1) has changed the internal layout for the .Lb doc strings, but to preserve backwards compatibility we cannot simply rename them, we need to create new aliases so that these will work with old and new macros. Signed-off-by: Guillem Jover <guillem@hadrons.org>
176 lines
5.0 KiB
Plaintext
176 lines
5.0 KiB
Plaintext
.\" $NetBSD: humanize_number.3,v 1.8 2008/04/30 13:10:50 martin Exp $
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.\"
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.\" Copyright (c) 1999, 2002, 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 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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.\"
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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 February 9, 2008
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.Dt HUMANIZE_NUMBER 3bsd
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.Os
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.Sh NAME
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.Nm dehumanize_number ,
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.Nm humanize_number
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.Nd format a number into a human readable form and viceversa
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.Sh LIBRARY
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.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
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.ds doc-str-Lb-libbsd \*[str-Lb-libbsd]
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.Lb libbsd
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.Sh SYNOPSIS
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.In stdlib.h
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(See
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.Xr libbsd 7
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for include usage.)
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.Ft int
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.Fn dehumanize_number "const char *str" "int64_t *result"
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.Ft int
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.Fn humanize_number "char *buf" "size_t len" "int64_t number" "const char *suffix" "int scale" "int flags"
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.Sh DESCRIPTION
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The
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.Fn humanize_number
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function formats the signed 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 1024 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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.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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To use a specific prefix, specify this as
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.Fa scale
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(Multiplier = 1024 ^ scale).
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This can not be combined with any of the
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.Fa scale
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flags below.
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.Pp
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The following flags may be passed in
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.Pa scale :
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.Bl -tag -width Dv -offset indent
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.It Dv HN_AUTOSCALE
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Format the buffer using the lowest multiplier possible.
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.It Dv HN_GETSCALE
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Return the prefix index number (the number of times
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.Fa number
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must be divided to fit) instead of formatting it to the buffer.
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.El
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.Pp
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The following flags may be passed in
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.Pa flags :
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.Bl -tag -width Dv -offset indent
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.It Dv HN_DECIMAL
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If the final result is less than 10, display it using one digit.
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.It Dv HN_NOSPACE
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Do not put a space between
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.Fa number
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and the prefix.
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.It Dv HN_B
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Use 'B' (bytes) as prefix if the original result does not have a prefix.
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.It Dv HN_DIVISOR_1000
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Divide
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.Fa number
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with 1000 instead of 1024.
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.El
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.Pp
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The
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.Fn dehumanize_number
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function parses the string representing an integral value given in
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.Fa str
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and stores the numerical value in the integer pointed to by
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.Fa result .
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The provided string may hold one of the suffixes, which will be interpreted
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and used to scale up its accompanying numerical value.
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.Sh RETURN VALUES
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.Fn humanize_number
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returns 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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If
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.Dv HN_GETSCALE
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is specified, the prefix index number will be returned instead.
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.Pp
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.Fn dehumanize_number
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returns 0 if the string was parsed correctly.
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A \-1 is returned to indicate failure and an error code is stored in
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.Va errno .
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.Sh ERRORS
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.Fn dehumanize_number
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will fail and no number will be stored in
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.Fa result
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if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The string in
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.Fa str
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was empty or carried an unknown suffix.
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.It Bq Er ERANGE
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The string in
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.Fa str
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represented a number that does not fit in
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.Fa result .
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.El
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.Sh SEE ALSO
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.Xr humanize_number 9
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.Sh HISTORY
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.Fn humanize_number
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first appeared in
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.Nx 2.0 .
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.Pp
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.Fn dehumanize_number
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first appeared in
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.\" FIXME: This should be in groff, but for now it avoids the warning.
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.ds operating-system-NetBSD-5.0 5.0
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.Nx 5.0 .
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