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create-buffer.sh
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create-buffer.sh
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#!/bin/bash
# bash-gorillas is a demake of QBasic GORILLAS completely rewritten
# in Bash.
# Copyright (C) 2013 Istvan Szantai <szantaii at sidenote dot hu>
#
# 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 (LICENSE).
# If not, see <http://www.gnu.org/licenses/>.
# Creates a 'screen buffer' file
create_buffer()
{
local buffer_name="bashgorillas-buffer"
# Try to use /dev/shm if available
# else use /tmp as the location of
# the screen buffer file
if [ -d "/dev/shm" ]
then
local buffer_directory="/dev/shm"
else
local buffer_directory="/tmp"
fi
# Try to use mktemp before using the unsafe method
if [ -x $(which mktemp) ]
then
# If 'mktemp' is available for use,
# then create the buffer file using it
buffer=$(mktemp --tmpdir=${buffer_directory} ${buffer_name}-XXXXXXXXXX)
else
# If 'mktemp' was not available for use,
# then create the buffer file using $RANDOM
#
# Note this is an unsafe method to create the
# screen buffer file!
# TODO: check if buffer file already exists, if unsafe method is used
buffer="${buffer_directory}/${buffer_name}-${RANDOM}"
# Create the buffer file
printf "" > $buffer
fi
}