+ local prefix
+ for i in "$@"; do
+ case "$i" in
+ -) local stdin=1; shift;;
+ *) if [ -z "${prefix:-}" ]; then
+ prefix="$i"; shift
+ else
+ error "prefix already specified: $prefix"
+ return 1
+ fi
+ ;;
+ esac
+ done
+ local tmpfile=$(mktemp -t ${prefix:-vit}.XXXXXX)
+ [ -n "$stdin" ] && cat >| $tmpfile