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@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