selftests: ftrace: Add a testcase for function filter glob match

#!/bin/sh

# description: ftrace - function glob filters

# Make sure that function glob matching filter works.

if ! grep -q function available_tracers; then

    echo "no function tracer configured"

    exit_unsupported

fi

disable_tracing

clear_trace

# filter by ?, schedule is always good

if ! echo "sch?dule" > set_ftrace_filter; then

    # test for powerpc 64

    if ! echo ".sch?dule" > set_ftrace_filter; then

	fail "can not enable schedule filter"

    fi

    cat set_ftrace_filter | grep '^.schedule$'

else

    cat set_ftrace_filter | grep '^schedule$'

fi

ftrace_filter_check() { # glob grep

  echo "$1" > set_ftrace_filter

  cut -f1 -d" " set_ftrace_filter > $TMPDIR/actual

  cut -f1 -d" " available_filter_functions | grep "$2" > $TMPDIR/expected

  DIFF=`diff $TMPDIR/actual $TMPDIR/expected`

  test -z "$DIFF"

}

# filter by *, front match

ftrace_filter_check '*schedule' '^.*schedule$'

# filter by *, middle match

ftrace_filter_check '*schedule*' '^.*schedule.*$'

# filter by *, end match

ftrace_filter_check 'schedule*' '^schedule.*$'

# filter by *, both side match

ftrace_filter_check 'sch*ule' '^sch.*ule$'

# filter by char class.

ftrace_filter_check '[Ss]y[Ss]_*' '^[Ss]y[Ss]_.*$'

echo > set_ftrace_filter

enable_tracing