1#!/bin/sh 2# exercise head -c 3 4# Copyright (C) 2001-2023 Free Software Foundation, Inc. 5 6# This program is free software: you can redistribute it and/or modify 7# it under the terms of the GNU General Public License as published by 8# the Free Software Foundation, either version 3 of the License, or 9# (at your option) any later version. 10 11# This program is distributed in the hope that it will be useful, 12# but WITHOUT ANY WARRANTY; without even the implied warranty of 13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14# GNU General Public License for more details. 15 16# You should have received a copy of the GNU General Public License 17# along with this program. If not, see <https://www.gnu.org/licenses/>. 18 19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 20print_ver_ head 21getlimits_ 22 23vm=$(get_min_ulimit_v_ head -c1 /dev/null) \ 24 || skip_ "this shell lacks ulimit support" 25 26# exercise the fix of 2001-08-18, based on test case from Ian Bruce 27echo abc > in || framework_failure_ 28(head -c1; head -c1) < in > out || fail=1 29case "$(cat out)" in 30 ab) ;; 31 *) fail=1 ;; 32esac 33 34# Test for a bug in coreutils 5.0.1 through 8.22. 35printf 'abc\ndef\n' > in1 || framework_failure_ 36(dd bs=1 skip=1 count=0 status=none && head -c-4) < in1 > out1 || fail=1 37case "$(cat out1)" in 38 bc) ;; 39 *) fail=1 ;; 40esac 41 42# Only allocate memory as needed. 43# Coreutils <= 8.21 would allocate memory up front 44# based on the value passed to -c 45(ulimit -v $(($vm+8000)) && head --bytes=-$SSIZE_MAX < /dev/null) || fail=1 46 47# Make sure it works on funny files in /proc and /sys. 48 49for file in /proc/version /sys/kernel/profiling; do 50 if test -r $file; then 51 cp -f $file copy && 52 head -c -1 copy > exp1 || framework_failure_ 53 54 head -c -1 $file > out1 || fail=1 55 compare exp1 out1 || fail=1 56 fi 57done 58 59Exit $fail 60