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- #! /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
- # Without trailing slash, from=/usr/lib and target=/uclibc/lib
- # mistakenly concludes that prefix=/u
- #prefix=`echo $from///$target | sed 's,\(\(/[^/]*\)*\).*///\1.*,\1,'`
- 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
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