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#!/bin/sh
# calcpath return a path which is $1/$2/$3 when $2 is relative and $2/$3 if absolute.
# Copyright (C) 2021-2023 Free Software Foundation, Inc.
# Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
#
# This file is part of GNU Modula-2.
#
# GNU Modula-2 is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 3, or (at your option) any later
# version.
#
# GNU Modula-2 is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with gm2; see the file COPYING. If not, write to the Free Software
# Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *)
Usage () {
cat<<EOF
Usage: $0 pathcomponent1 pathcomponent2 subdir
if pathcomponent2 is relative then pathcomponent1/pathcompinent2/subdir is returned
otherwise pathcomponent2/subdir is returned
the path is checked for legality in subdir.
EOF
}
die () {
printf "calcpath: error: %s\n" "$1" >&2
exit 1
}
if [ $# -eq 3 ]; then
case "$2" in
/*) the_path="$2/$3" ;;
*) the_path="$1/$2/$3" ;;
esac
cd "$3" || die "could not access $3"
if ( cd "$the_path" ); then
printf '%s\n' "${the_path}"
else
die "${the_path} is not a valid path in subdirectory $3"
fi
else
Usage
exit 1
fi
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