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Elixir Cross Referencer

#!/bin/sh

target="$1"
loc="$2"

test "$target" || exit 1
test "$loc" || loc=.
test -x "$loc/usage" || exit 1
test "$SED" || SED=sed
test "$DD" || DD=dd

exec >"$target.$$"

echo '#define UNPACKED_USAGE "" \'
"$loc/usage" | od -v -t x1 \
| $SED -e 's/^[^ ]*//' \
	-e 's/ //g' \
	-e '/^$/d' \
	-e 's/\(..\)/\\x\1/g' \
	-e 's/^/"/' \
	-e 's/$/" \\/'
echo ''

echo '#define PACKED_USAGE \'
## Breaks on big-endian systems!
## # Extra effort to avoid using "od -t x1": -t is not available
## # in non-CONFIG_DESKTOPed busybox od
##
## "$loc/usage" | bzip2 -1 | od -v -x \
## | $SED -e 's/^[^ ]*//' \
##	-e 's/ //g' \
##	-e '/^$/d' \
##	-e 's/\(..\)\(..\)/0x\2,0x\1,/g'
##	-e 's/$/ \\/'
"$loc/usage" | bzip2 -1 | $DD bs=2 skip=1 2>/dev/null | od -v -t x1 \
| $SED -e 's/^[^ ]*//' \
	-e 's/ //g' \
	-e '/^$/d' \
	-e 's/\(..\)/0x\1,/g' \
	-e 's/$/ \\/'
echo ''

if cmp -s "$target.$$" "$target" 2>/dev/null; then
    rm -- "$target.$$"
else
    mv -- "$target.$$" "$target"
fi