bzip2/bzdiff at master · LuaDist/bzip2 · GitHub

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#!/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$ARG";;
*)	iftest -f "$ARG";then
 FILES="$FILES$ARG"
else
echo"${prog}: $ARG not found or not a regular file"
exit 1
fi ;;
esac
done
iftest -z "$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
iftest$# -eq 1;then
	FILE=`echo "$1"| sed 's/.bz2$//'`
	bzip2 -cd "$FILE.bz2"|$comp$OPTIONS - "$FILE"
	STAT="$?"

eliftest$# -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