Stefano Lattarini wrote:
> $ /usr/xpg4/bin/sh -c 'test -z ")"'; echo $?
> 0
Yikes, thanks for pointing it out. I wonder if we should introduce a
sane_test function, like this.
empty_string () {
case $* in
?*)
return 1 ;;
*)
return 0 ;;
esac
}
# This is like "test", but:
# - it only implements a minimal subset of the functionality
# - it works around shells that cannot cope with parentheses as
# parameters to some operators, like ksh before 2008:
#
# $ /usr/xpg4/bin/sh -c 'test -z ")"'; echo $?
# 0
sane_test () {
# implied -n
test "$#" = 0 && set -- -n ""
test "$#" = 1 && set -- -n "$1"
test "$#" = 2 && test "z$1" = z! && set -- -z "$2"
test "$#" -le 4 ||
case $# in
2)
case $1 in
-z)
empty_string "$2" ;;
-n)
! empty_string "$2" ;;
-*)
test "$@" ;;
*)
die "sane_test: unrecognized unary operator $1" ;;
esac
;;
3)
case $2 in
= | !=)
test "z$1" "$2" "z$3" ;;
-eq | -lt | -gt | -le | -ge)
test "$@" ;;
*)
die "sane_test: unrecognized binary operator $2" ;;
esac
;;
4)
test "z$1" = z! ||
die "sane_test: unrecognized 4-argument test (not a negation)"
shift
! sane_test "$@"
;;
*)
die 'sane_test: too many arguments'
;;
esac
}
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