#!/bin/sh

set -eu

sed_bin=$1

# Limine uses this portability probe in gensyms.sh.  The first sed must reject
# the unsupported word-boundary character classes without consuming the pipe,
# leaving the input available to the GNU-compatible fallback expression.
actual="$({
    printf '%s\n' \
        '00000000 l d .text discarded' \
        '00000010 g F .text retained'
} | ("$sed_bin" '/[[:<:]]d[[:>:]]/d' 2>/dev/null ||
     "$sed_bin" '/\bd\b/d'))"

expected='00000010 g F .text retained'

if [ "$actual" != "$expected" ]; then
    printf 'expected: %s\nactual:   %s\n' "$expected" "$actual" >&2
    exit 1
fi