mirror of
git://git.sv.gnu.org/coreutils.git
synced 2026-04-11 22:54:02 +02:00
295ee521bc
* src/head.c (elide_tail_lines_seekable): Reset file pointer after printing up to an end-relative line-counted offset. Anoop Sharma reported the problem and suggested the fix. * tests/misc/head-pos: Add coverage via a very similar, existing test. Also add coverage for a previously untested block of code. * tests/misc/head-elide-tail ($READ_BUFSIZE): Update to 8192, to match the value of BUFSIZ I see today on Fedora 17/x86_64 (unrelated to this fix). * NEWS (Bug fixes): Mention it. Improved-by: Pádraig Brady
45 lines
1.6 KiB
Bash
Executable File
45 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
|
|
# When reading a specified number of lines, ensure that the output
|
|
# file pointer is positioned just after those lines.
|
|
|
|
# Copyright (C) 2002-2012 Free Software Foundation, Inc.
|
|
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
. "${srcdir=.}/init.sh"; path_prepend_ ../src
|
|
print_ver_ head
|
|
|
|
(echo a; echo b) > in || framework_failure_
|
|
echo b > exp || framework_failure_
|
|
|
|
for i in -1 1; do
|
|
(head -n $i >/dev/null; cat) < in > out || fail=1
|
|
compare exp out || fail=1
|
|
done
|
|
|
|
# Exercise the (start_pos < pos) block in elide_tail_lines_seekable.
|
|
# So far, this is the only test to do that.
|
|
# Do that by creating a file larger than BUFSIZ (I've seen 128K) and
|
|
# elide a suffix of it (by line count) that is also larger than BUFSIZ.
|
|
# 50000 lines times 6 bytes per line gives us enough leeway even on a
|
|
# system with a BUFSIZ of 256K.
|
|
n_lines=50000
|
|
seq 70000 > in2 || framework_failure_
|
|
echo $n_lines > exp-n || framework_failure_
|
|
|
|
(head -n-$n_lines>/dev/null; wc -l) < in2 > n
|
|
compare exp-n n || fail=1
|
|
|
|
Exit $fail
|