#   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/>.
#
# Problems with variables that expand to 0x7f and quoted nulls in the same
# expansion -- affects bash versions 4.0-post 4.2
a=x
b=
del=$'\x7f'

set ""

recho ${undef-"x$*y"}
recho "x$*y"
recho x"$*"y
recho x"$del"y

recho ${undef-"$@"}
recho "$@"
recho "${@}"
recho ${undef-"$*"}
recho "$*"
recho "${*}"

recho "$del${a#x}"
recho "$del ${a#x}"
recho " $del${a#x}"

recho " $del$b"
recho " $del${b}"
recho " $del${b#x}"
recho " $del${a#x}"

recho " $del${a%x}"
recho " $del${a:0:0}"
recho " $del"${a:0:0}
recho " $del""${a:0:0}"
recho " $del${a}"
recho " $del"
recho " ${del}${a:0:0}"
recho " ${del:0:1}${a:0:0}"
recho " ${del:0:1}${a}"
recho "${del:0:1}${a#d}"
recho "${del:0:1}${a#x}"
recho " ${del:0:1} ${a}"
recho "${del:0:1} ${a#d}"
recho "${del:0:1} ${a#x}"