- # magic, (since we use stdin to pass the gzip output to grep).
- # So find a free fd and change the argument to then use this
- # file descriptor for the pattern.
- case $optarg in
- (" '-'" | " '/dev/stdin'" | " '/dev/fd/0'")
- pat_on_stdin=1
- eval 'test -e .' 2>/dev/null \
- && eval 'exists(){ test -e "$@"; }' \
- || eval 'exists(){ test -r "$@" || test -w "$@"; }'
- # Start search from 6 since the script already uses 3 and 5
- fd=6
- pat_fd=
- while : ; do
- if ! exists /proc/$$/fd/$fd; then
- pat_fd=$fd
- break;
- fi
- fd=$(expr $fd + 1)
- if test $fd = 255; then
- printf >&2 '%s: no free file descriptor\n' "$0"
- exit 2
- fi
- done
- optarg=/dev/fd/$pat_fd;
- esac
+ # magic, since we use stdin to pass the gzip output to grep.
+ # Similarly if it is not a regular file, since it might be read repeatedly.
+ # In either of these two cases, copy the pattern into a temporary file,
+ # and use that file instead. The pattern might contain null bytes,
+ # so we cannot simply switch to -e here.
+ if case $optarg in
+ (" '-'" | " '/dev/stdin'" | " '/dev/fd/0'")
+ :;;
+ (*)
+ eval "test ! -f$optarg";;
+ esac
+ then
+ if test -n "$pattmp"; then
+ eval "cat --$optarg" >>"$pattmp" || exit 2
+ continue
+ fi
+ trap '
+ test -n "$pattmp" && rm -f "$pattmp"
+ (exit 2); exit 2
+ ' HUP INT PIPE TERM 0
+ case $TMPDIR in
+ / | /*/) ;;
+ /*) TMPDIR=$TMPDIR/;;
+ *) TMPDIR=/tmp/;;
+ esac
+ if type mktemp >/dev/null 2>&1; then
+ pattmp=$(mktemp "${TMPDIR}zgrepXXXXXXXXX") || exit 2
+ else
+ set -C
+ pattmp=${TMPDIR}zgrep$$
+ fi
+ eval "cat --$optarg" >"$pattmp" || exit 2
+ optarg=' "$pattmp"'
+ fi