#!/bin/sh

# Demonstrate the disk-filling infloop when redirecting to an input file.

. "${srcdir=.}/init.sh"; path_prepend_ ../src

require_timeout_

# Use an input file large enough that the problem is reproducible in spite

# of buffering effects.  Just larger than 256KB should be adequate.

v=$(printf %063d 0)'

'

# 64 * 2^12 = 256k

for i in 1 2 3 4 5 6 7 8 9 10 11 12; do

  v="$v$v"

done

echo "$v" > out || framework_failure_

for arg in out - ''; do

  # Accommodate both 'out' and '(standard input)', as well as

  # the multi-byte quoting we see on OS/X-based systems.

  echo grep: input file ... is also the output > err.exp || framework_failure_

  # Require an exit status of 2.

  # grep-2.8 and earlier would infloop with $arg = out.

  # grep-2.10 and earlier would infloop with $arg = - or $arg = ''.

  timeout 10 grep 0 $arg < out >> out 2> err; st=$?; test $st = 2 || fail=1

  sed 's/file .* is/file ... is/' err > k && mv k err

  # Normalize the diagnostic prefix from e.g., "/mnt/dir/grep: " to "grep: "

  sed 's/^[^:]*: /grep: /' err > k && mv k err

  compare err.exp err || fail=1

  # But with each of the following options it must not exit-2.

  for i in -q -m1 -l -L; do

    timeout 10 grep $i 0 $arg < out >> out 2> err; st=$?

    test $st = 2 && fail=1

  done

  timeout 10 grep -2 0 $arg < out >> out 2> err; st=$?

  test $st = 2 || fail=1

done

Exit $fail