2013-12-06 12:04:52 +01:00
|
|
|
.\" $NetBSD: strpct.3,v 1.5 2013/07/20 21:39:57 wiz Exp $
|
2012-09-11 18:02:49 +02:00
|
|
|
.\"
|
|
|
|
|
.\" Copyright (c) 2011 The NetBSD Foundation, Inc.
|
|
|
|
|
.\" All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" This file was contributed to The NetBSD Foundation by Christos Zoulas.
|
|
|
|
|
.\"
|
|
|
|
|
.\" 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" 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 January 7, 2012
|
|
|
|
|
.Dt STRPCT 3
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm strpct ,
|
|
|
|
|
.Nm strspct
|
|
|
|
|
.Nd decimal percent formatters
|
|
|
|
|
.Sh LIBRARY
|
|
|
|
|
.Lb libutil
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In util.h
|
|
|
|
|
.Ft char *
|
|
|
|
|
.Fn strpct "char *buf" "size_t bufsiz" "uintmax_t numerator" "uintmax_t denominator" "size_t precision"
|
|
|
|
|
.Ft char *
|
|
|
|
|
.Fn strspct "char *buf" "size_t bufsiz" "intmax_t numerator" "intmax_t denominator" "size_t precision"
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
|
|
|
|
.Fn strpct
|
|
|
|
|
function formats the fraction represented by
|
|
|
|
|
.Fa numerator
|
|
|
|
|
and
|
|
|
|
|
.Fa denominator
|
|
|
|
|
into a percentage representation with given number of digits of
|
|
|
|
|
.Fa precision
|
|
|
|
|
without using floating point arithmetic.
|
|
|
|
|
.Sh RETURN VALUES
|
|
|
|
|
.Fn strpct
|
|
|
|
|
and
|
|
|
|
|
.Fn strspct
|
|
|
|
|
always return a pointer to a NUL-terminated (unless
|
|
|
|
|
.Fa buflen
|
|
|
|
|
is
|
|
|
|
|
.Dv 0 )
|
|
|
|
|
formatted string which
|
|
|
|
|
is placed in
|
|
|
|
|
.Fa buf
|
|
|
|
|
and is up to
|
|
|
|
|
.Fa buflen
|
|
|
|
|
characters.
|
|
|
|
|
If there was an overflow, the formatted string will reflect that precision
|
|
|
|
|
loss.
|
|
|
|
|
.Sh EXAMPLES
|
|
|
|
|
.Bd -literal -offset indent
|
|
|
|
|
strpct(buf, buflen, 1, 16, 3);
|
|
|
|
|
\(rA "6.250"
|
|
|
|
|
strpct(buf, buflen, 1, 2, 0);
|
|
|
|
|
\(rA "50"
|
|
|
|
|
.Ed
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
.Fn strpct
|
|
|
|
|
was originally implemented in
|
|
|
|
|
.Xr csh 1
|
|
|
|
|
for
|
|
|
|
|
.Nx 1.3 .
|
|
|
|
|
It printed into a static buffer, was not locale aware, handled
|
|
|
|
|
.Ft unsigned long
|
|
|
|
|
numbers, and printed a
|
|
|
|
|
.Dq %
|
|
|
|
|
at the end of the number.
|
|
|
|
|
Other programs such as
|
|
|
|
|
.Xr df 1
|
|
|
|
|
and
|
|
|
|
|
.Xr time 1
|
|
|
|
|
started using it.
|
|
|
|
|
.Fn strpct
|
|
|
|
|
and
|
|
|
|
|
.Fn strspct
|
|
|
|
|
appeared separately in libutil for
|
|
|
|
|
.Nx 6.0 .
|
|
|
|
|
.Sh AUTHORS
|
2013-12-06 12:04:52 +01:00
|
|
|
.An Erik E. Fair Aq Mt fair@netbsd.org
|
