xref: /dragonfly/usr.bin/gzip/zdiff (revision 36a3d1d6) 
1#!/bin/sh -
2#
3# $NetBSD: zdiff,v 1.2 2003/12/28 12:43:43 wiz Exp $
4# $DragonFly: src/usr.bin/gzip/zdiff,v 1.1 2004/10/26 11:19:31 joerg Exp $
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#
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
27case $0 in
28	*cmp)	prog=cmp
29		;;
30	*)	prog=diff
31		;;
32esac
33USAGE="usage: z$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
37flags=
38while 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
52done
53
54if [ $# -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	gzip -cdfq "$1" | $prog $flags - "$files"
71	status=$?
72elif [ $# -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="gzip -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				gzip -cdfq "$2" > $tmp
89				files="$files $tmp"
90			else
91				files="$files -"
92				filt="gzip -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 $files
103	fi
104	status=$?
105else
106	echo "$USAGE" 1>&2
107	exit 1
108fi
109
110exit $status
111