1#!/bin/sh -
2#
3# $NetBSD: zdiff,v 1.4 2010/04/14 18:55:12 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@courtesan.com>
8# Copyright (c) 2010 Joerg Sonnenberger <joerg@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
28case $0 in
29	*cmp)	prog=cmp
30		;;
31	*)	prog=diff
32		;;
33esac
34USAGE="usage: $0 [options] file1 [file2]"
35
36check_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
88flags=
89while 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
106done
107
108if [ $# -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=$?
118elif [ $# -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=$?
135else
136	echo "$USAGE" 1>&2
137	exit 1
138fi
139
140exit $status
141