Add humanize_number(3) to libutil for formating numbers into a human
readable form. Obtained from: NetBSD
This commit is contained in:
parent
8cab54e9a8
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=129677
@ -6,9 +6,9 @@ SHLIB_MAJOR= 4
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SHLIBDIR?= /lib
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CFLAGS+=-DLIBC_SCCS -I${.CURDIR} -I${.CURDIR}/../libc/gen/
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CFLAGS+=-DINET6
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SRCS= _secure_path.c auth.c fparseln.c login.c login_auth.c \
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login_cap.c login_class.c login_crypt.c login_ok.c login_times.c \
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login_tty.c logout.c logwtmp.c property.c pty.c \
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SRCS= _secure_path.c auth.c fparseln.c humanize_number.c login.c \
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login_auth.c login_cap.c login_class.c login_crypt.c login_ok.c \
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login_times.c login_tty.c logout.c logwtmp.c property.c pty.c \
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pw_util.c realhostname.c stub.c \
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trimdomain.c uucplock.c
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INCS= libutil.h login_cap.h
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@ -16,7 +16,7 @@ INCS= libutil.h login_cap.h
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MAN+= login.3 login_auth.3 login_tty.3 logout.3 logwtmp.3 pty.3 \
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login_cap.3 login_class.3 login_times.3 login_ok.3 \
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_secure_path.3 uucplock.3 property.3 auth.3 realhostname.3 \
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realhostname_sa.3 trimdomain.3 fparseln.3
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realhostname_sa.3 trimdomain.3 fparseln.3 humanize_number.3
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MAN+= login.conf.5 auth.conf.5
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MLINKS+= property.3 properties_read.3 property.3 properties_free.3
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MLINKS+= property.3 property_find.3
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137
lib/libutil/humanize_number.3
Normal file
137
lib/libutil/humanize_number.3
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@ -0,0 +1,137 @@
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.\" $NetBSD: humanize_number.3,v 1.4 2003/04/16 13:34:37 wiz Exp $
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.\" $FreeBSD$
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.\"
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.\" Copyright (c) 1999, 2002 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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.\" 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 25, 2004
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.Dt HUMANIZE_NUMBER 3
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.Os
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.Sh NAME
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.Nm humanize_number
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.Nd format a number into a human readable form
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.Sh SYNOPSIS
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.In util.h
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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 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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.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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.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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160
lib/libutil/humanize_number.c
Normal file
160
lib/libutil/humanize_number.c
Normal file
@ -0,0 +1,160 @@
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/* $NetBSD: humanize_number.c,v 1.5 2003/12/26 11:30:36 simonb Exp $ */
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/*
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* Copyright (c) 1997, 1998, 1999, 2002 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 Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center, 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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* 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <locale.h>
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#include <libutil.h>
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int
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humanize_number(char *buf, size_t len, int64_t bytes,
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const char *suffix, int scale, int flags)
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{
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const char *prefixes;
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int i, r;
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int64_t divisor, max, s1, s2, sign;
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size_t baselen, suffixlen;
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assert(buf != NULL);
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assert(suffix != NULL);
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assert(scale >= 0);
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if (flags & HN_DIVISOR_1000) {
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/* SI for decimal multiplies */
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divisor = 1000;
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prefixes = " kMGTPE";
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} else {
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/*
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* binary multiplies
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* XXX IEC 60027-2 recommends Ki, Mi, Gi...
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*/
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divisor = 1024;
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prefixes = " KMGTPE";
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}
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if ((size_t) scale >= strlen(prefixes) && scale != HN_AUTOSCALE &&
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scale != HN_GETSCALE)
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return (-1);
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if (buf == NULL || suffix == NULL)
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return (-1);
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if (len > 0)
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buf[0] = '\0';
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if (bytes < 0) {
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sign = -1;
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bytes *= -100;
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baselen = 4;
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} else {
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sign = 1;
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bytes *= 100;
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baselen = 3;
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}
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suffixlen = strlen(suffix);
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/* check if enough room for `x y' + suffix + `\0' */
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if (len < baselen + suffixlen + 1)
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return (-1);
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if (flags & HN_DIVISOR_1000)
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divisor = 1000;
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else
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divisor = 1024;
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max = 100;
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for (i = 0;
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(size_t) i < len - suffixlen - baselen + ((flags & HN_NOSPACE) ?
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1 : 0); i++)
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max *= 10;
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if ((scale & HN_AUTOSCALE) || (scale & HN_GETSCALE)) {
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for (i = 0; bytes >= max && prefixes[i + 1]; i++)
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bytes /= divisor;
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} else {
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for (i = 0; i < scale && prefixes[i + 1]; i++)
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bytes /= divisor;
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}
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if (scale & HN_GETSCALE)
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return (i);
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if (bytes < 1000 && flags & HN_DECIMAL) {
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if (len < (baselen + 2 + ((flags & HN_NOSPACE) || (i == 0 &&
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!(flags & HN_B)) ? 0 : 1)))
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return (-1);
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s1 = bytes / 100;
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if ((s2 = (((bytes % 100) + 5) / 10)) == 10) {
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s1++;
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s2 = 0;
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}
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if (s1 < 10 && i == 0)
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/* Don't ever use .0 for a number less than 10. */
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r = snprintf(buf, len, "%lld%s%c%s",
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/* LONGLONG */
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(long long)(sign * s1),
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(i == 0 && !(flags & HN_B)) || flags & HN_NOSPACE ?
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"" : " ", (i == 0 && (flags & HN_B)) ? 'B' :
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prefixes[i], suffix);
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else
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r = snprintf(buf, len, "%lld%s%lld%s%c%s",
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/* LONGLONG */
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(long long)(sign * s1),
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localeconv()->decimal_point,
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/* LONGLONG */
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(long long)s2,
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(i == 0 && !(flags & HN_B)) || flags & HN_NOSPACE ?
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"" : " ", (i == 0 && (flags & HN_B)) ? 'B' :
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prefixes[i], suffix);
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} else
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r = snprintf(buf, len, "%lld%s%c%s",
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/* LONGLONG */
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(long long)(sign * ((bytes + 50) / 100)),
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i == 0 || flags & HN_NOSPACE ? "" : " ", (i == 0 &&
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(flags & HN_B)) ? 'B' : prefixes[i], suffix);
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return (r);
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}
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@ -69,6 +69,8 @@ int openpty(int *_amaster, int *_aslave, char *_name,
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struct termios *_termp, struct winsize *_winp);
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int forkpty(int *_amaster, char *_name,
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struct termios *_termp, struct winsize *_winp);
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int humanize_number(char *_buf, size_t _len, int64_t _number,
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const char *_suffix, int _scale, int _flags);
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const char *uu_lockerr(int _uu_lockresult);
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int uu_lock(const char *_ttyname);
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int uu_unlock(const char *_ttyname);
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@ -129,4 +131,13 @@ __END_DECLS
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#define PWSCAN_MASTER 0x01
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#define PWSCAN_WARN 0x02
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/* humanize_number(3) */
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#define HN_DECIMAL 0x01
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#define HN_NOSPACE 0x02
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#define HN_B 0x04
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#define HN_DIVISOR_1000 0x08
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#define HN_GETSCALE 0x10
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#define HN_AUTOSCALE 0x20
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#endif /* !_LIBUTIL_H_ */
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