#!/bin/sh -
case $0 in
*cmp) prog=cmp
;;
*) prog=diff
;;
esac
USAGE="usage: $0 [options] file1 [file2]"
check_suffix() {
case "$1" in
*[._-][Zz])
setvar $2 "${1%??}"
setvar $3 "gzip -cdqf"
;;
*[._-]bz)
setvar $2 "${1%???}"
setvar $3 "bzip2 -cdqf"
;;
*[._-]gz)
setvar $2 "${1%???}"
setvar $3 "gzip -cdqf"
;;
*[._-]xz)
setvar $2 "${1%???}"
setvar $3 "xz -cdqf"
;;
*[._-]bz2)
setvar $2 "${1%????}"
setvar $3 "bzip2 -cdqf"
;;
*[._-]lzma)
setvar $2 "${1%?????}"
setvar $3 "xz -cdqf"
;;
*.t[ag]z)
setvar $2 "${1%??}"ar
setvar $3 "gzip -cdqf"
;;
*.tbz)
setvar $2 "${1%??}"ar
setvar $3 "bzip2 -cdqf"
;;
*.tbz2)
setvar $2 "${1%???}"ar
setvar $3 "bzip2 -cdqf"
;;
*.t[lx]z)
setvar $2 "${1%??}"ar
setvar $3 "xz -cdqf"
;;
*)
setvar $2 "$1"
setvar $3 ""
;;
esac
}
flags=
while test $ case "$1" in
--)
shift
break
;;
-)
break
;;
-*)
flags="$flags $1"
shift
;;
*)
break
;;
esac
done
if [ $ files="$1"
check_suffix "$1" files filt
if [ -z "$filt" ]; then
echo "z$prog: unknown suffix" 1>&2
exit 1
fi
$filt -- "$1" | $prog $flags -- - "$files"
status=$?
elif [ $ check_suffix "$1" files filt
check_suffix "$2" files2 filt2
if [ -z "$filt" -a -z "$filt2" ]; then
$prog $flags -- "$1" "$2"
elif [ -z "$filt" -a -n "$filt2" -a "$1" != "-" ]; then
$filt2 -- "$2" | $prog $flags -- "$1" -
elif [ -n "$filt" -a -z "$filt2" -a "$2" != "-" ]; then
$filt -- "$1" | $prog $flags -- - "$2"
else
tmp=`mktemp -t z$prog.XXXXXXXXXX` || exit 1
trap "rm -f $tmp" 0 1 2 3 13 15
${filt2:-cat} -- "$2" > $tmp || exit $?
${filt:-cat} -- "$1" | $prog $flags -- - "$tmp"
fi
status=$?
else
echo "$USAGE" 1>&2
exit 1
fi
exit $status