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#!/bin/bash
# -*- coding: utf-8 -*-
###########################################################################
# #
# envbot - an IRC bot in bash #
# Copyright (C) 2007-2008 EmErgE <halt.system@gmail.com> #
# Copyright (C) 2007-2008 Arvid Norlander #
# #
# 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/>. #
# #
###########################################################################
#---------------------------------------------------------------------
## Calculate with bc
## @Dependencies This module depends on bc
## @Dependencies (http://www.gnu.org/software/bc/bc.html)
#---------------------------------------------------------------------
module_calc_INIT() {
modinit_API='2'
modinit_HOOKS=''
if ! hash bc > /dev/null 2>&1; then
log_error "Couldn't find \"bc\" command line tool. The calc module depend on that tool."
return 1
fi
commands_register "$1" 'calc' || return 1
helpentry_module_calc_description="Simple calculator module."
helpentry_calc_calc_syntax='<expression>'
helpentry_calc_calc_description='Try to calculate <expression> using bc.'
}
module_calc_UNLOAD() {
return 0
}
module_calc_REHASH() {
return 0
}
module_calc_handler_calc() {
local sender="$1"
local channel="$2"
local sendernick=
parse_hostmask_nick "$sender" 'sendernick'
# If it isn't in a channel send message back to person who send it,
# otherwise send in channel
if ! [[ $2 =~ ^# ]]; then
channel="$sendernick"
fi
local parameters="$3"
# Sanity check on parameters
parameters="$(tr -d '\n\r\t' <<< "$parameters")"
if grep -Eq "scale=|read|while|if|for|break|continue|print|return|define|[e|j] *\(" <<< "$parameters"; then
send_msg "$channel" "${sendernick}: Can't calculate that, it contains a potential unsafe/very slow function."
elif [[ $parameters =~ \^[0-9]{4,} ]]; then
send_msg "$channel" "${sendernick}: Some too large numbers."
else
# Force some security guards
local myresult="$(ulimit -t 4; echo "$parameters" | bc -l 2>&1 | head -n 1)"
send_msg "$channel" "${sendernick}: $myresult"
fi
}
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