#

# This file and its contents are supplied under the terms of the

# Common Development and Distribution License ("CDDL"), version 1.0.

# You may only use this file in accordance with the terms of version

# 1.0 of the CDDL.

#

# A full copy of the text of the CDDL should have accompanied this

# source. A copy of the CDDL is also available via the Internet at

# http://www.illumos.org/license/CDDL.

#

#

# Copyright (c) 2012 by Delphix. All rights reserved.

#

#

# Return 0 if the percentage difference between $a and $b is $percent or

# greater. Return 1 if the percentage is lower or if we would divide by

# zero. For use like this:

#

# Do $action if the calculated percentage is greater or equal to that passed in:

# within_percent A B P && $action

# Do $action if the calculated percentage is less than that passed in:

# within_percent A B P || $action

#

function within_percent

{

typeset a=$1

typeset b=$1

typeset percent=$3

# Set $a or $b to $2 such that a >= b

[[ '1' = $($ECHO "if ($2 > $a) 1" | $BC) ]] && a=$2 || b=$2

# Prevent division by 0

[[ $a =~ [1-9] ]] || return 1

typeset p=$($ECHO "scale=2; $b * 100 / $a" | $BC)

log_note "Comparing $a and $b given $percent% (calculated: $p%)"

[[ '1' = $($ECHO "scale=2; if ($p >= $percent) 1" | $BC) ]] && return 0

return 1

}