MINI Sh3ll

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

loopy_wait()
{
	local sleep_cmd=$1; shift
	local timeout_ms=$1; shift

	local start_time="$(date -u +%s%3N)"
	while true
	do
		local out
		if out=$("$@"); then
			echo -n "$out"
			return 0
		fi

		local current_time="$(date -u +%s%3N)"
		if ((current_time - start_time > timeout_ms)); then
			echo -n "$out"
			return 1
		fi

		$sleep_cmd
	done
}

busywait()
{
	local timeout_ms=$1; shift

	loopy_wait : "$timeout_ms" "$@"
}

# timeout in seconds
slowwait()
{
	local timeout_sec=$1; shift

	loopy_wait "sleep 0.1" "$((timeout_sec * 1000))" "$@"
}