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zdiff revision 1.2 
      1 #!/bin/sh -
      2 #
      3 # $NetBSD: zdiff,v 1.2 2003/12/28 12:43:43 wiz Exp $
      4 #
      5 # $OpenBSD: zdiff,v 1.2 2003/07/29 07:42:44 otto Exp $
      6 #
      7 # Copyright (c) 2003 Todd C. Miller <Todd.Miller (at] courtesan.com>
      8 #
      9 # Permission to use, copy, modify, and distribute this software for any
     10 # purpose with or without fee is hereby granted, provided that the above
     11 # copyright notice and this permission notice appear in all copies.
     12 #
     13 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     14 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     15 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     16 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     17 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     18 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     19 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     20 #
     21 # Sponsored in part by the Defense Advanced Research Projects
     22 # Agency (DARPA) and Air Force Research Laboratory, Air Force
     23 # Materiel Command, USAF, under agreement number F39502-99-1-0512.
     24 #
     25 
     26 # Set $prog based on $0
     27 case $0 in
     28 	*cmp)	prog=cmp
     29 		;;
     30 	*)	prog=diff
     31 		;;
     32 esac
     33 USAGE="usage: z$prog [options] file1 [file2]"
     34 
     35 # Pull out any command line flags so we can pass them to diff/cmp
     36 # XXX - assumes there is no optarg
     37 flags=
     38 while test $# -ne 0; do
     39 	case "$1" in
     40 		--)
     41 			shift
     42 			break
     43 			;;
     44 		-*)
     45 			flags="$flags $1"
     46 			shift
     47 			;;
     48 		*)
     49 			break
     50 			;;
     51 	esac
     52 done
     53 
     54 if [ $# -eq 1 ]; then
     55 	# One file given, compare compressed to uncompressed
     56 	files="$1"
     57 	case "$1" in
     58 		*[._-][Zz])
     59 			files="${1%??}"
     60 			;;
     61 		*[._-]gz)
     62 			files="${1%???}"
     63 			;;
     64 		*.t[ag]z)
     65 			files="${1%??}"ar
     66 			;;
     67 		*)	echo "z$prog: unknown suffix" 1>&2
     68 			exit 1
     69 	esac
     70 	compress -cdfq "$1" | $prog $flags - "$files"
     71 	status=$?
     72 elif [ $# -eq 2 ]; then
     73 	# Two files given, compare the two uncompressing as needed
     74 	case "$1" in
     75 		*[._-][Zz]|*[._-]gz|*.t[ag]z)
     76 			files=-
     77 			filt="compress -cdfq $1"
     78 			;;
     79 		*)
     80 			files="$1"
     81 			;;
     82 	esac
     83 	case "$2" in
     84 		*[._-][Zz]|*[._-]gz|*.t[ag]z)
     85 			if [ "$files" = "-" ]; then
     86 				tmp=`mktemp -t z$prog.XXXXXXXXXX` || exit 1
     87 				trap "rm -f $tmp" 0 1 2 3 13 15
     88 				compress -cdfq "$2" > $tmp
     89 				files="$files $tmp"
     90 			else
     91 				files="$files -"
     92 				filt="compress -cdfq $2"
     93 			fi
     94 			;;
     95 		*)
     96 			files="$files $2"
     97 			;;
     98 	esac
     99 	if [ -n "$filt" ]; then
    100 		$filt | $prog $flags $files
    101 	else
    102 		$prog $flags $files
    103 	fi
    104 	status=$?
    105 else
    106 	echo "$USAGE" 1>&2
    107 	exit 1
    108 fi
    109 
    110 exit $status
    111