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zdiff revision 1.1 
      1 #!/bin/sh -
      2 #
      3 # $OpenBSD: zdiff,v 1.2 2003/07/29 07:42:44 otto Exp $
      4 #
      5 # Copyright (c) 2003 Todd C. Miller <Todd.Miller (at] courtesan.com>
      6 #
      7 # Permission to use, copy, modify, and distribute this software for any
      8 # purpose with or without fee is hereby granted, provided that the above
      9 # copyright notice and this permission notice appear in all copies.
     10 #
     11 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     12 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     13 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     14 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     15 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     16 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     17 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     18 #
     19 # Sponsored in part by the Defense Advanced Research Projects
     20 # Agency (DARPA) and Air Force Research Laboratory, Air Force
     21 # Materiel Command, USAF, under agreement number F39502-99-1-0512.
     22 #
     23 
     24 # Set $prog based on $0
     25 case $0 in
     26 	*cmp)	prog=cmp
     27 		;;
     28 	*)	prog=diff
     29 		;;
     30 esac
     31 USAGE="usage: z$prog [options] file1 [file2]"
     32 
     33 # Pull out any command line flags so we can pass them to diff/cmp
     34 # XXX - assumes there is no optarg
     35 flags=
     36 while test $# -ne 0; do
     37 	case "$1" in
     38 		--)
     39 			shift
     40 			break
     41 			;;
     42 		-*)
     43 			flags="$flags $1"
     44 			shift
     45 			;;
     46 		*)
     47 			break
     48 			;;
     49 	esac
     50 done
     51 
     52 if [ $# -eq 1 ]; then
     53 	# One file given, compare compressed to uncompressed
     54 	files="$1"
     55 	case "$1" in
     56 		*[._-][Zz])
     57 			files="${1%??}"
     58 			;;
     59 		*[._-]gz)
     60 			files="${1%???}"
     61 			;;
     62 		*.t[ag]z)
     63 			files="${1%??}"ar
     64 			;;
     65 		*)	echo "z$prog: unknown suffix" 1>&2
     66 			exit 1
     67 	esac
     68 	compress -cdfq "$1" | $prog $flags - "$files"
     69 	status=$?
     70 elif [ $# -eq 2 ]; then
     71 	# Two files given, compare the two uncompressing as needed
     72 	case "$1" in
     73 		*[._-][Zz]|*[._-]gz|*.t[ag]z)
     74 			files=-
     75 			filt="compress -cdfq $1"
     76 			;;
     77 		*)
     78 			files="$1"
     79 			;;
     80 	esac
     81 	case "$2" in
     82 		*[._-][Zz]|*[._-]gz|*.t[ag]z)
     83 			if [ "$files" = "-" ]; then
     84 				tmp=`mktemp -t z$prog.XXXXXXXXXX` || exit 1
     85 				trap "rm -f $tmp" 0 1 2 3 13 15
     86 				compress -cdfq "$2" > $tmp
     87 				files="$files $tmp"
     88 			else
     89 				files="$files -"
     90 				filt="compress -cdfq $2"
     91 			fi
     92 			;;
     93 		*)
     94 			files="$files $2"
     95 			;;
     96 	esac
     97 	if [ -n "$filt" ]; then
     98 		$filt | $prog $flags $files
     99 	else
    100 		$prog $flags $files
    101 	fi
    102 	status=$?
    103 else
    104 	echo "$USAGE" 1>&2
    105 	exit 1
    106 fi
    107 
    108 exit $status
    109