#! /bin/bash

LEAKCHECKFILE="$1"
TMPFILE="${TMPDIR:-/tmp}/malloc-free-check-$$${RANDOM}${RANDOM}${RANDOM}.tmp"
export LEAKCHECKFILE TMPFILE

if [ -z "${LEAKCHECKFILE}" ]; then
	echo "Usage: leakcheck <filename>" >&2
	echo "         filename       Name of file containing debugging output" >&2

	exit 1
fi

egrep '(MALLOC|FREE|REALLOC)' "$@" | sed 's@^.*FREE(\(0x[0-9a-f]*\)).*$@free \1@;s@^.*MALLOC() = @malloc @;s@^.*REALLOC(\(0x[0-9a-f]*\)) = @realloc \1 @' > "${TMPFILE}"
egrep '(MALLOC|FREE|REALLOC)' "${LEAKCHECKFILE}" | sed 's@^.*FREE(\(0x[0-9a-f]*\)).*$@free \1@;s@^.*MALLOC() = @malloc @;s@^.*REALLOC(\(0x[0-9a-f]*\)) = @realloc \1 @' > "${TMPFILE}"

cat "${TMPFILE}" | while read op addr newaddr; do
	case "${op}" in
		malloc)
			if [ -z "${alloclist}" ]; then
				alloclist="${addr}"
			else

done | tail -1 | while read leftovers; do
	for leftover in ${leftovers}; do
		case "${leftover}" in
			!*)
				leftover="$(echo "${leftover}" | cut -c 2-)"

				echo "Double freed or never allocated ${leftover}:"
				grep "${leftover}" "$@" | sed 's@^@    @'
				grep "${leftover}" "${LEAKCHECKFILE}" | sed 's@^@    @'
				echo ''
				;;
			*)
				echo "Unfreed memory ${leftover}:"
				grep "${leftover}" "$@" | sed 's@^@    @'
				grep "${leftover}" "${LEAKCHECKFILE}" | sed 's@^@    @'
				echo ''
				;;
		esac
	done
done

rm -f "${TMPFILE}"