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#!/bin/sh
#
# Copyright (C) 2022 Free Software Foundation, Inc.
#
# This file is part of groff.
#
# groff 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.
#
# groff 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/>.
#
set -e
preconv="${abs_top_builddir:-.}/preconv"
fail=
wail () {
echo FAILED >&2
fail=YES
}
# Scrape debugging output to see if we're skipping unseekable streams.
# This is fragile, but we don't want to lock the language of diagnostic
# messages (especially debugging ones). If this test fails, check the
# text of the command's debugging output for a mismatch before
# investigating deeper problems.
echo "testing seekability of file operand '-'" >&2
output=$(printf '' | "$preconv" -d - 2>&1)
echo "$output" | grep -q "stream is not seekable" || wail
# /dev/stdin might not exist in a chroot. Or, if it's not (a symbolic
# link to) a character special device, the next test will not be valid,
# as when using GNU Make's `-j` option.
#
# Similarly, we must have a controlling terminal.
test -z "$fail"
echo "skipping if /dev/stdin is not a character device" >&2
test -c /dev/stdin || exit 77 # skip
echo "skipping if there is no controlling terminal" >&2
test "$(tty)" != "not a tty" || exit 77 # skip
echo "testing seekability of standard input stream" >&2
output=$(printf '' | "$preconv" -d /dev/stdin 2>&1)
echo "$output" | grep -q "stream is not seekable" || wail
test -z "$fail"
# vim:set ai et sw=4 ts=4 tw=72:
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