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      1 #!/bin/sh -
      2 #
      3 # $NetBSD: zdiff,v 1.5 2010/04/14 20:30:28 joerg 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 # Copyright (c) 2010 Joerg Sonnenberger <joerg (at] NetBSD.org>
      9 #
     10 # Permission to use, copy, modify, and distribute this software for any
     11 # purpose with or without fee is hereby granted, provided that the above
     12 # copyright notice and this permission notice appear in all copies.
     13 #
     14 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     15 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     16 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     17 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     18 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     19 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     20 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     21 #
     22 # Sponsored in part by the Defense Advanced Research Projects
     23 # Agency (DARPA) and Air Force Research Laboratory, Air Force
     24 # Materiel Command, USAF, under agreement number F39502-99-1-0512.
     25 #
     26 
     27 # Set $prog based on $0
     28 case $0 in
     29 	*cmp)	prog=cmp
     30 		;;
     31 	*)	prog=diff
     32 		;;
     33 esac
     34 USAGE="usage: $0 [options] file1 [file2]"
     35 
     36 check_suffix() {
     37 	case "$1" in
     38 	*[._-][Zz])
     39 		setvar $2 "${1%??}"
     40 		setvar $3 "gzip -cdqf"
     41 		;;
     42 	*[._-]bz)
     43 		setvar $2 "${1%???}"
     44 		setvar $3 "bzip2 -cdqf"
     45 		;;
     46 	*[._-]gz)
     47 		setvar $2 "${1%???}"
     48 		setvar $3 "gzip -cdqf"
     49 		;;
     50 	*[._-]xz)
     51 		setvar $2 "${1%???}"
     52 		setvar $3 "xz -cdqf"
     53 		;;
     54 	*[._-]bz2)
     55 		setvar $2 "${1%????}"
     56 		setvar $3 "bzip2 -cdqf"
     57 		;;
     58 	*[._-]lzma)
     59 		setvar $2 "${1%?????}"
     60 		setvar $3 "xz -cdqf"
     61 		;;
     62 	*.t[ag]z)
     63 		setvar $2 "${1%??}"ar
     64 		setvar $3 "gzip -cdqf"
     65 		;;
     66 	*.tbz)
     67 		setvar $2 "${1%??}"ar
     68 		setvar $3 "bzip2 -cdqf"
     69 		;;
     70 	*.tbz2)
     71 		setvar $2 "${1%???}"ar
     72 		setvar $3 "bzip2 -cdqf"
     73 		;;
     74 	*.t[lx]z)
     75 		setvar $2 "${1%??}"ar
     76 		setvar $3 "xz -cdqf"
     77 		;;
     78 	*)
     79 		setvar $2 "$1"
     80 		setvar $3 ""
     81 		;;
     82 	esac
     83 }
     84 
     85 
     86 # Pull out any command line flags so we can pass them to diff/cmp
     87 # XXX - assumes there is no optarg
     88 flags=
     89 while test $# -ne 0; do
     90 	case "$1" in
     91 		--)
     92 			shift
     93 			break
     94 			;;
     95 		-)
     96 			break
     97 			;;
     98 		-*)
     99 			flags="$flags $1"
    100 			shift
    101 			;;
    102 		*)
    103 			break
    104 			;;
    105 	esac
    106 done
    107 
    108 if [ $# -eq 1 ]; then
    109 	# One file given, compare compressed to uncompressed
    110 	files="$1"
    111 	check_suffix "$1" files filt
    112 	if [ -z "$filt" ]; then
    113 		echo "z$prog: unknown suffix" 1>&2
    114 		exit 1
    115 	fi
    116 	$filt -- "$1" | $prog $flags -- - "$files"
    117 	status=$?
    118 elif [ $# -eq 2 ]; then
    119 	# Two files given, compare the two uncompressing as needed
    120 	check_suffix "$1" files filt
    121 	check_suffix "$2" files2 filt2
    122 	if [ -z "$filt" -a -z "$filt2" ]; then
    123 		$prog $flags -- "$1" "$2"
    124 	elif [ -z "$filt" -a -n "$filt2" -a "$1" != "-" ]; then
    125 		$filt2 -- "$2" | $prog $flags -- "$1" -
    126 	elif [ -n "$filt" -a -z "$filt2" -a "$2" != "-" ]; then
    127 		$filt -- "$1" | $prog $flags -- - "$2"
    128 	else
    129 		tmp=`mktemp -t z$prog.XXXXXXXXXX` || exit 1
    130 		trap "rm -f $tmp" 0 1 2 3 13 15
    131 		${filt2:-cat} -- "$2" > $tmp || exit $?
    132 		${filt:-cat} -- "$1" | $prog $flags -- - "$tmp"
    133 	fi
    134 	status=$?
    135 else
    136 	echo "$USAGE" 1>&2
    137 	exit 1
    138 fi
    139 
    140 exit $status
    141