#! /bin/sh # # Copyright 2003 Alexandre Oliva <aoliva@redhat.com> # Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org> # # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. # # This script computes a relative pathname from $1 to $2 # They are assumed to not contain . or .. pathname components, # but if both directories exist and cd/pwd canonicalizes pathnames, # this shouldn't matter. PWD_CMD may be set to some pwd command that does. from=`(cd $1 > /dev/null && ${PWD_CMD-pwd} || echo $1) 2>/dev/null | sed 's,//*,/,g;s,/*$,,'` target=`(cd $2 > /dev/null && ${PWD_CMD-pwd} || echo $2) 2>/dev/null | sed 's,//*,/,g;s,/*$,,'` case $from in /* | "") ;; *) from=`${PWD_CMD-pwd}`/$from ;; esac case $target in /* | "") ;; *) target=`${PWD_CMD-pwd}`/$target ;; esac case $target in "$from" | "$from/"*) dots=`echo $from | sed s,.,.,g` echo $target | sed "s,^$dots/*,,;s,[^/]$,&/," exit 0 ;; esac case $from in "$target/"*) dots=`echo $target | sed s,.,.,g` echo $from/ | sed "s,^$dots/*,,;s,[^/]$,&/,;s,[^/]*/*,../,g;s,[^/]$,&/," exit 0 ;; esac prefix=`echo $from///$target | sed 's,\(\(/[^/]*\)*\).*///\1.*,\1,'` dots=`echo $prefix | sed s,.,.,g` from=`echo $from | sed "s,^$dots,,"` target=`echo $target | sed "s,^$dots,,"` from=`echo $from | sed 's,[^/][^/]*,..,g;s,.$,&/,'` echo ${from}$target/ exit 0