#!/bin/sh

# Copyright (C) 2017 Red Hat, Inc.
#
# This program 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 of the License, or
# (at your option) any later version.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

# print deprecation warning
warn()
{
    echo "$0: warning: usleep(1) is deprecated, use sleep(1) instead!" >&2
}

# simplified option handling
for arg; do
    case $arg in
        -v|--version)
            warn
            sleep --version
            exit 0
            ;;
        -o|--oot|-\?|--help)
            warn
            exit 0
            ;;
        -*)
            warn
            echo "$0: bad argument: $arg" >&2
            exit 1
            ;;
    esac
done

# check that there is at most one argument
if [ $# -ge 2 ]; then
    warn
    echo "$0: too many arguments: $#" >&2
fi

# convert microseconds to seconds using bc(1)
secs="$(printf '%s\n' scale=9 "${1:-1}/1000000" | bc;)"

# use sleep(1) as the actual implementation
exec sleep "$secs"