100 lines
2.9 KiB
Groff
100 lines
2.9 KiB
Groff
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.\" $NetBSD: strpct.3,v 1.4 2012/01/07 18:40:55 christos Exp $
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.\"
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.\" Copyright (c) 2011 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This file was contributed to The NetBSD Foundation by Christos Zoulas.
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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 January 7, 2012
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.Dt STRPCT 3
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.Os
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.Sh NAME
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.Nm strpct ,
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.Nm strspct
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.Nd decimal percent formatters
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.In util.h
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.Ft char *
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.Fn strpct "char *buf" "size_t bufsiz" "uintmax_t numerator" "uintmax_t denominator" "size_t precision"
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.Ft char *
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.Fn strspct "char *buf" "size_t bufsiz" "intmax_t numerator" "intmax_t denominator" "size_t precision"
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.Sh DESCRIPTION
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The
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.Fn strpct
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function formats the fraction represented by
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.Fa numerator
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and
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.Fa denominator
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into a percentage representation with given number of digits of
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.Fa precision
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without using floating point arithmetic.
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.Sh RETURN VALUES
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.Fn strpct
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and
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.Fn strspct
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always return a pointer to a NUL-terminated (unless
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.Fa buflen
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is
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.Dv 0 )
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formatted string which
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is placed in
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.Fa buf
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and is up to
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.Fa buflen
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characters.
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If there was an overflow, the formatted string will reflect that precision
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loss.
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.Sh EXAMPLES
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.Bd -literal -offset indent
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strpct(buf, buflen, 1, 16, 3);
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\(rA "6.250"
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strpct(buf, buflen, 1, 2, 0);
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\(rA "50"
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.Ed
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.Sh HISTORY
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.Fn strpct
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was originally implemented in
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.Xr csh 1
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for
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.Nx 1.3 .
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It printed into a static buffer, was not locale aware, handled
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.Ft unsigned long
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numbers, and printed a
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.Dq %
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at the end of the number.
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Other programs such as
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.Xr df 1
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and
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.Xr time 1
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started using it.
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.Fn strpct
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and
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.Fn strspct
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appeared separately in libutil for
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.Nx 6.0 .
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.Sh AUTHORS
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.An Erik E. Fair Aq fair@netbsd.org
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