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#!/bin/sh
# BSD LICENSE
#
# Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * 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.
# * Neither the name of Intel Corporation nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
# OWNER 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.
#
# print the relative path of $1 from $2 directory
# $1 and $2 MUST be absolute paths
#
if [ $# -ne 2 ]; then
echo "Bad arguments"
echo "Usage:"
echo " $0 path1 path2"
exit 1
fi
# get the real absolute path, derefencing symlinks
ABS1=$(readlink -f $1)
ABS2=$(readlink -f $2)
# remove leading slash
REL1=${ABS1#/}
REL2=${ABS2#/}
left1=${REL1%%/*}
right1=${REL1#*/}
prev_right1=$REL1
prev_left1=
left2=${REL2%%/*}
right2=${REL2#*/}
prev_right2=$REL2
prev_left2=
prefix=
while [ "${right1}" != "" -a "${right2}" != "" ]; do
if [ "$left1" != "$left2" ]; then
break
fi
prev_left1=$left1
left1=$left1/${right1%%/*}
prev_right1=$right1
right1=${prev_right1#*/}
if [ "$right1" = "$prev_right1" ]; then
right1=""
fi
prev_left2=$left2
left2=$left2/${right2%%/*}
prev_right2=$right2
right2=${prev_right2#*/}
if [ "$right2" = "$prev_right2" ]; then
right2=""
fi
done
if [ "${left1}" != "${left2}" ]; then
right2=${prev_right2}
right1=${prev_right1}
fi
while [ "${right2}" != "" ]; do
prefix=${prefix}../
prev_right2=$right2
right2=${right2#*/}
if [ "$right2" = "$prev_right2" ]; then
right2=""
fi
done
echo ${prefix}${right1}
exit 0
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