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#!/bin/sh
# SPDX-License-Identifier: BSD-3-Clause
# Copyright(c) 2010-2014 Intel Corporation
#
# 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 " $0 path1 path2"
exit 1
fi
# get the real absolute path, derefencing symlinks
ABS1="$(dirname $(readlink -f $1))/$(basename $1)"
ABS2=$(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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