#!/bin/sh
# Ensure that du can handle a 2GB file (i.e., a file of size 2^31 bytes)
# Before coreutils-5.93, on systems with a signed, 32-bit stat.st_blocks
# one of du's computations would overflow.

# Copyright (C) 2005, 2006 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

if test "$VERBOSE" = yes; then
  set -x
  du --version
fi

. $srcdir/../envvar-check

# Creating a 2GB file counts as `very expensive'.
. $srcdir/../very-expensive

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
trap 'status=$?; cd "$pwd" && chmod -R u+rwx $t0 && rm -rf $t0 && exit $status' 0
trap '(exit $?); exit $?' 1 2 13 15

framework_failure=0
mkdir -p $tmp || framework_failure=1
cd $tmp || framework_failure=1

if test $framework_failure = 1; then
  echo "$0: failure in testing framework" 1>&2
  (exit 1); exit 1
fi

fail=0

# Get number of free kilobytes on current partition, so we can
# skip this test if there is insufficient free space.

# This technique relies on the fact that the `Available' kilobyte
# count is the number just before the one with a trailing `%'.
free_kb=`df -kP .|tail -1|sed 's/ [0-9][0-9]*%.*//;s/ *$//;s/.* //'`
case "$free_kb" in
  [0-9]*) ;;
  *) echo "invalid size from df: $free_kb" 1>&2; (exit 77); exit 77;;
esac

# Require about 3GB free.
min_kb=3000000
test $min_kb -lt $free_kb ||
{
  echo "$0: skipping this test:"
  echo "too little free space on current partition: $free_kb (need $min_kb KB)" \
    1>&2;
  (exit 77); exit 77
}

big=big
rm -f $big
test -t 1 || printf 'creating a 2GB file...\n'
for i in `seq 100`; do
  # Note: 2147483648 == 2^31. Print floor(2^31/100) per iteration.
  printf %21474836s x >> $big || fail=1
  # On the final iteration, append the remaining 48 bytes.
  test $i = 100 && { printf %48s x >> $big || fail=1; }
  test -t 1 && printf 'creating a 2GB file: %d%% complete\r' $i
done
echo

du -k $big > out1 || fail=1
rm -f $big
sed 's/^2[0-9][0-9][0-9][0-9][0-9][0-9]	'$big'$/~2M/' out1 > out

cat <<\EOF > exp || fail=1
~2M
EOF

cmp out exp || fail=1
test $fail = 1 && diff out exp 2> /dev/null

(exit $fail); exit $fail
