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# Copyright (c) 2017 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# NAME
# which.subr -- locate a program file in the $PATH environment variable
#
# SYNOPSIS
# task_which name [...]
#
# DESCRIPTION
# The task_which function takes a list of names and looks for the
# files which would be executed had these names been given as
# commands. Each directory in the $PATH is searched, in order,
# for each name.
#
# RETURN VALUES
# The task_which function returns 0 if all commandss are found,
# and >0 otherwise.
#
# ENVIRONMENT
# The following variables are used if they are set:
#
# PATH A colon-separated list of directories to search for
# commands.
#
__task_which__="yes"
task_which()
{
local result=0
local command
for arg; do
if [ -n "$arg" ] && _task_which "$arg"; then
echo "$command"
else
result=1
fi
done
return $result
}
_task_which()
{
: ${PATH:=/bin:/sbin:/usr/bin:/usr/sbin}
# Return path to command in $command.
command=
local result=1
local cmd="$1"; shift
case $cmd in
/*) if [ -x "$cmd" ]; then
command="$cmd"
result=0
fi ;;
*) local save_IFS="$IFS"; IFS=":"; set -- ${PATH}; IFS=$save_IFS
for path; do
if [ -x "$path/$cmd" ]; then
command="$path/$cmd"
result=0
break
fi
done ;;
esac
# POST-CONDITION:
# $command is set to the string with the full path to the command.
return $result
}
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