1#!/bin/sh 2# When reading a specified number of lines, ensure that the output 3# file pointer is positioned just after those lines. 4 5# Copyright (C) 2002-2023 Free Software Foundation, Inc. 6 7# This program is free software: you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation, either version 3 of the License, or 10# (at your option) any later version. 11 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16 17# You should have received a copy of the GNU General Public License 18# along with this program. If not, see <https://www.gnu.org/licenses/>. 19 20. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 21print_ver_ head 22 23(echo a; echo b) > in || framework_failure_ 24echo b > exp || framework_failure_ 25 26for i in -1 1; do 27 (head -n $i >/dev/null; cat) < in > out || fail=1 28 compare exp out || fail=1 29done 30 31# Exercise the (start_pos < pos) block in elide_tail_lines_seekable. 32# So far, this is the only test to do that. 33# Do that by creating a file larger than BUFSIZ (I've seen 128K) and 34# elide a suffix of it (by line count) that is also larger than BUFSIZ. 35# 50000 lines times 6 bytes per line gives us enough leeway even on a 36# system with a BUFSIZ of 256K. 37n_lines=50000 38seq 70000 > in2 || framework_failure_ 39echo $n_lines > exp-n || framework_failure_ 40 41(head -n-$n_lines>/dev/null; wc -l) < in2 > n 42compare exp-n n || fail=1 43 44Exit $fail 45