#!/bin/sh
# test diagnostics are printed when seeking too far in seekable files.

# Copyright (C) 2008 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/>.

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

. $srcdir/test-lib.sh
eval $(getlimits) #for OFF_T limits

fail=0

printf "1234" > file || framework_failure

echo "\
dd: \`standard input': cannot skip to specified offset
0+0 records in
0+0 records out" > skip_err || framework_failure

# skipping beyond number of blocks in file should issue a warning
dd bs=1 skip=5 count=0 status=noxfer < file 2> err || fail=1
compare skip_err err || fail=1

# skipping beyond number of bytes in file should issue a warning
dd bs=3 skip=2 count=0 status=noxfer < file 2> err || fail=1
compare skip_err err || fail=1

# skipping beyond number of blocks in pipe should issue a warning
cat file | dd bs=1 skip=5 count=0 status=noxfer 2> err || fail=1
compare skip_err err || fail=1

# skipping beyond number of bytes in pipe should issue a warning
cat file | dd bs=3 skip=2 count=0 status=noxfer 2> err || fail=1
compare skip_err err || fail=1

# Check seeking beyond file already offset into
# skipping beyond number of blocks in file should issue a warning
(dd bs=1 skip=1 count=0 2>/dev/null &&
 dd bs=1 skip=4 status=noxfer 2> err) < file || fail=1
compare skip_err err || fail=1

# Check seeking beyond file already offset into
# skipping beyond number of bytes in file should issue a warning
(dd bs=1 skip=1 count=0 2>/dev/null &&
 dd bs=2 skip=2 status=noxfer 2> err) < file || fail=1
compare skip_err err || fail=1

# seeking beyond end of file is OK
dd bs=1 seek=5 count=0 status=noxfer > file 2> err || fail=1
echo "0+0 records in
0+0 records out" > err_ok || framework_failure
compare err_ok err || fail=1

# skipping > OFF_T_MAX should fail immediately
dd bs=1 skip=$OFF_T_OFLOW count=0 status=noxfer < file 2> err && fail=1
echo "dd: \`standard input': cannot skip: Value too large for defined data type
0+0 records in
0+0 records out" > err_ok || framework_failure
compare err_ok err || fail=1

# skipping > max file size should fail immediately
# Note I'm guessing there is a small chance that an lseek() could actually work
# and only a write() would fail (with EFBIG) when offset > max file size.
# So this test will both test for that, and ensure that dd
# exits immediately with an appropriate error when lseek() does error.
if ! truncate --size=$OFF_T_MAX in 2>/dev/null; then
  # truncate is to ensure file system doesn't actually support OFF_T_MAX files
  dd bs=1 skip=$OFF_T_MAX count=0 status=noxfer < file 2> err && fail=1
  echo "dd: \`standard input': cannot skip: Invalid argument
0+0 records in
0+0 records out" > err_ok || framework_failure
  compare err_ok err || fail=1
fi

Exit $fail