#!/bin/sh
# Copyright (C) 2007 Krzysztof Kozlowski
#   License: GNU General Public License version 2
#            http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# version 2 as published by the Free Software Foundation.
#
# 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.
#
#
# Homepage: http://www.kozik.net.pl
#
# Last change: 8.04.2007
#
# Useful functions.
#


# Usage: die [message] [error_code]
die() {
  echo $1
  if [ $# -eq 2 ]; then
    exit $2
  fi
  exit 1
}


# Usage: find_free_loop_dev
# return: device node name (/dev/loopX)
find_free_loop_dev() {
  _dev="/dev/loop"
  for i in 0 1 2 3 4 5 6 7 ; do
    is_used=`losetup -a | grep ${_dev}/${i}`
    if [ "$is_used" == "" ]; then
      echo ${_dev}${i}
      return
    fi
  done
  echo ""
  return
}

# Usage: absolute_pathname pathname
absolute_pathname() {
  cd $1 || exit $?
  pwd
  return
}

# Usage: trim_string string
trim_string() {
  echo `echo "$1" | sed -e 's/^ *//' -e 's/ *$//'`
  return
}