#!/bin/sh

# sh is buggy on RS/6000 AIX 3.2. Replace above line with #!/bin/ksh

# Bzcmp/diff wrapped for bzip2, 

# adapted from zdiff by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.

# Bzcmp and bzdiff are used to invoke the cmp or the  diff  pro-

# gram  on compressed files.  All options specified are passed

# directly to cmp or diff.  If only 1 file is specified,  then

# the  files  compared  are file1 and an uncompressed file1.gz.

# If two files are specified, then they are  uncompressed  (if

# necessary) and fed to cmp or diff.  The exit status from cmp

# or diff is preserved.

PATH="/usr/bin:/bin:$PATH"; export PATH

prog=`echo $0 | sed 's|.*/||'`

case "$prog" in

  *cmp) comp=${CMP-cmp}   ;;

  *)    comp=${DIFF-diff} ;;

esac

OPTIONS=

FILES=

for ARG

do

    case "$ARG" in

    -*)	OPTIONS="$OPTIONS $ARG";;

     *)	if test -f "$ARG"; then

            FILES="$FILES $ARG"

        else

            echo "${prog}: $ARG not found or not a regular file"

	    exit 1

        fi ;;

    esac

done

if test -z "$FILES"; then

	echo "Usage: $prog [${comp}_options] file [file]"

	exit 1

fi

tmp=`mktemp ${TMPDIR:-/tmp}/bzdiff.XXXXXXXXXX` || {

      echo 'cannot create a temporary file' >&2

      exit 1

}

set $FILES

if test $# -eq 1; then

	FILE=`echo "$1" | sed 's/.bz2$//'`

	bzip2 -cd "$FILE.bz2" | $comp $OPTIONS - "$FILE"

	STAT="$?"

elif test $# -eq 2; then

	case "$1" in

        *.bz2)

                case "$2" in

	        *.bz2)

			F=`echo "$2" | sed 's|.*/||;s|.bz2$||'`

                        bzip2 -cdfq "$2" > $tmp

                        bzip2 -cdfq "$1" | $comp $OPTIONS - $tmp

                        STAT="$?"

			/bin/rm -f $tmp;;

                *)      bzip2 -cdfq "$1" | $comp $OPTIONS - "$2"

                        STAT="$?";;

                esac;;

        *)      case "$2" in

	        *.bz2)

                        bzip2 -cdfq "$2" | $comp $OPTIONS "$1" -

                        STAT="$?";;

                *)      $comp $OPTIONS "$1" "$2"

                        STAT="$?";;

                esac;;

	esac

        exit "$STAT"

else

	echo "Usage: $prog [${comp}_options] file [file]"

	exit 1

fi