#!/bin/sh
# Ensure that tac processes all command line arguments, even
# when it encounters an error with say the first one.
# With coreutils-5.2.1 and earlier, this test would fail.

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

. $srcdir/../lang-default

# See if the envvar is defined.
if test x = "x$FULL_PARTITION_TMPDIR"; then
  echo "$0: FULL_PARTITION_TMPDIR not defined; skipping this test" 1>&2
  (exit 77); exit 77
fi

if ! test -d "$FULL_PARTITION_TMPDIR"; then
  echo "$0: $FULL_PARTITION_TMPDIR:" \
    "\$FULL_PARTITION_TMPDIR does not specify a directory" 1>&2
  (exit 1); exit 1
fi

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

fp_tmp="$FULL_PARTITION_TMPDIR/tac-cont-$$"
t0="$t0 $fp_tmp"
# Make sure we can create an empty file there (i.e. no shortage of inodes).
if ! touch $fp_tmp; then
  echo "$0: $fp_tmp: cannot create empty file" 1>&2
  (exit 1); exit 1
fi

# Make sure that we fail when trying to create a file large enough
# to consume a non-inode block.
if seq 1000 > $fp_tmp 2>/dev/null; then
  echo "$0: $FULL_PARTITION_TMPDIR: not a full partition" 1>&2
  (exit 1); exit 1
fi

seq 5 > in

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

fail=0

# Give tac a fifo command line argument.
# This makes it try to create a temporary file in $TMPDIR.
mkfifo fifo
seq 1000 > fifo &
TMPDIR=$FULL_PARTITION_TMPDIR tac fifo in >out 2>err && fail=1

cat <<\EOF > exp || fail=1
5
4
3
2
1
EOF

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

(exit $fail); exit $fail