#
#   Copyright
#
#       Copyright (C) 2016-2017 Costa Tsaousis <costa@tsaousis.gr>
#       Copyright (C) 2016-2017 Phil Whineray <phil@sanewall.org>
#
#   See sbin/firehol.in for details
#
#   This file contains functions used by the firehol suite.
#   To keep the namespace clean, functions defined in functions.x.sh
#   should be of the form x_whatever() if they are intended for general
#   use or int_x_whatever() if they are intended as helpers to the other
#   functions in the file.
#

common_require_cmd() {
	local progname="$1" var="$2" val=

	eval val=\$\{${var}\}
	if [ "${val}" ]
	then
		return 0
	fi

	$CAT_CMD  >&2 <<-__EOF__
		ERROR: $progname feature requires $var

		You have invoked the program requesting a feature which uses
		a program which was not available when $progname was installed.

		Please re-install $progname with a suitable command available.
		__EOF__

	exit 1
}

common_require_root() {
	if [ "${UID}" != 0 ]
	then
		echo >&2
		echo >&2 "ERROR:"
		echo >&2 "Only user root can run ${1}"
		echo >&2
		return 1
	fi
	return 0
}

common_disable_localization() {
	export LC_ALL=C
}

common_private_umask() {
	# Make sure our generated files cannot be accessed by anyone else.
	umask 077
}

common_public_umask() {
	# let everyone read our status info
	umask 022
}

common_setup_terminal() {
	# Are stdout/stderr on the terminal? If not, then fail
	test -t 2 || return 1
	test -t 1 || return 1

	if [ ! -z "$TPUT_CMD" ]
	then
		if [ $[$($TPUT_CMD colors 2>/dev/null)] -ge 8 ]
		then
			# Enable colors
			COLOR_RESET="\e[0m"
			COLOR_BLACK="\e[30m"
			COLOR_RED="\e[31m"
			COLOR_GREEN="\e[32m"
			COLOR_YELLOW="\e[33m"
			COLOR_BLUE="\e[34m"
			COLOR_PURPLE="\e[35m"
			COLOR_CYAN="\e[36m"
			COLOR_WHITE="\e[37m"
			COLOR_BGBLACK="\e[40m"
			COLOR_BGRED="\e[41m"
			COLOR_BGGREEN="\e[42m"
			COLOR_BGYELLOW="\e[43m"
			COLOR_BGBLUE="\e[44m"
			COLOR_BGPURPLE="\e[45m"
			COLOR_BGCYAN="\e[46m"
			COLOR_BGWHITE="\e[47m"
			COLOR_BOLD="\e[1m"
			COLOR_DIM="\e[2m"
			COLOR_UNDERLINED="\e[4m"
			COLOR_BLINK="\e[5m"
			COLOR_INVERTED="\e[7m"
		fi
	fi

	return 0
}