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#!/bin/sh
# Ensure that shuf randomizes its input.
# Copyright (C) 2006-2011 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/>.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
print_ver_ shuf
getlimits_
seq 100 > in || framework_failure_
shuf in >out || fail=1
# Fail if the input is the same as the output.
# This is a probabilistic test :-)
# However, the odds of failure are very low: 1 in 100! (~ 1 in 10^158)
compare in out > /dev/null && { fail=1; echo "not random?" 1>&2; }
# Fail if the sorted output is not the same as the input.
sort -n out > out1
compare in out1 || { fail=1; echo "not a permutation" 1>&2; }
# Exercise shuf's -i option.
shuf -i 1-100 > out || fail=1
compare in out > /dev/null && { fail=1; echo "not random?" 1>&2; }
sort -n out > out1
compare in out1 || { fail=1; echo "not a permutation" 1>&2; }
# Exercise shuf's -e option.
t=`shuf -e a b c d e | sort | fmt`
test "$t" = 'a b c d e' || { fail=1; echo "not a permutation" 1>&2; }
# Before coreutils-6.3, this would infloop.
# "seq 1860" produces 8193 (8K + 1) bytes of output.
seq 1860 | shuf > /dev/null || fail=1
# coreutils-6.12 and earlier would output a newline terminator, not \0.
shuf --zero-terminated -i 1-1 > out || fail=1
printf '1\0' > exp || framework_failure_
cmp out exp || { fail=1; echo "missing NUL terminator?" 1>&2; }
# Ensure shuf -n operates efficiently for small n. Before coreutils-8.13
# this would try to allocate $SIZE_MAX * sizeof(size_t)
timeout 10 shuf -i1-$SIZE_MAX -n2 >/dev/null ||
{ fail=1; echo "couldn't get a small subset" >&2; }
Exit $fail
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