#!/bin/sh
# Ensure that cat -E produces same output as cat, module `$'s,
# even when applied to a file in /proc.

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

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

f=/proc/cpuinfo
test -f $f \
  || {
       echo "$0: no $f skipping this test" 1>&2
       (exit 77); exit 77
     }

fail=0

# Yes, parts of /proc/cpuinfo might change between cat runs.
# If that happens, consider choosing a file that's less likely to change,
# or just filter out the changing lines.  The sed filter should help
# to avoid any spurious numeric differences.
cat -E $f | sed 's/[0-9][0-9]*/D/g' | tr -d '$' > out || fail=1
cat    $f | sed 's/[0-9][0-9]*/D/g' | tr -d '$' > exp || fail=1

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

(exit $fail); exit $fail