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54 lines
1.5 KiB
Bash
Executable File
54 lines
1.5 KiB
Bash
Executable File
#!/bin/sh
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# calcpath return a path which is $1/$2/$3 when $2 is relative and $2/$3 if absolute.
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# Copyright (C) 2021-2026 Free Software Foundation, Inc.
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# Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
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#
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# This file is part of GNU Modula-2.
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#
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# GNU Modula-2 is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 3, or (at your option) any later
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# version.
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#
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# GNU Modula-2 is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GCC; see the file COPYING3. If not see
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# <http://www.gnu.org/licenses/>.
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Usage () {
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cat<<EOF
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Usage: $0 pathcomponent1 pathcomponent2 subdir
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if pathcomponent2 is relative then pathcomponent1/pathcompinent2/subdir is returned
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otherwise pathcomponent2/subdir is returned
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the path is checked for legality in subdir.
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EOF
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}
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die () {
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printf "calcpath: error: %s\n" "$1" >&2
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exit 1
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}
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if [ $# -eq 3 ]; then
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case "$2" in
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/*) the_path="$2/$3" ;;
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*) the_path="$1/$2/$3" ;;
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esac
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cd "$3" || die "could not access $3"
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if ( cd "$the_path" ); then
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printf '%s\n' "${the_path}"
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else
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die "${the_path} is not a valid path in subdirectory $3"
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fi
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else
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Usage
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exit 1
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fi
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