NetBSD/usr.bin/gzip/zdiff

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#!/bin/sh -
#
# $NetBSD: zdiff,v 1.5 2010/04/14 20:30:28 joerg Exp $
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#
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# $OpenBSD: zdiff,v 1.2 2003/07/29 07:42:44 otto Exp $
#
# Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
# Copyright (c) 2010 Joerg Sonnenberger <joerg@NetBSD.org>
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#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# Sponsored in part by the Defense Advanced Research Projects
# Agency (DARPA) and Air Force Research Laboratory, Air Force
# Materiel Command, USAF, under agreement number F39502-99-1-0512.
#
# Set $prog based on $0
case $0 in
*cmp) prog=cmp
;;
*) prog=diff
;;
esac
USAGE="usage: $0 [options] file1 [file2]"
check_suffix() {
case "$1" in
*[._-][Zz])
setvar $2 "${1%??}"
setvar $3 "gzip -cdqf"
;;
*[._-]bz)
setvar $2 "${1%???}"
setvar $3 "bzip2 -cdqf"
;;
*[._-]gz)
setvar $2 "${1%???}"
setvar $3 "gzip -cdqf"
;;
*[._-]xz)
setvar $2 "${1%???}"
setvar $3 "xz -cdqf"
;;
*[._-]bz2)
setvar $2 "${1%????}"
setvar $3 "bzip2 -cdqf"
;;
*[._-]lzma)
setvar $2 "${1%?????}"
setvar $3 "xz -cdqf"
;;
*.t[ag]z)
setvar $2 "${1%??}"ar
setvar $3 "gzip -cdqf"
;;
*.tbz)
setvar $2 "${1%??}"ar
setvar $3 "bzip2 -cdqf"
;;
*.tbz2)
setvar $2 "${1%???}"ar
setvar $3 "bzip2 -cdqf"
;;
*.t[lx]z)
setvar $2 "${1%??}"ar
setvar $3 "xz -cdqf"
;;
*)
setvar $2 "$1"
setvar $3 ""
;;
esac
}
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# Pull out any command line flags so we can pass them to diff/cmp
# XXX - assumes there is no optarg
flags=
while test $# -ne 0; do
case "$1" in
--)
shift
break
;;
-)
break
;;
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-*)
flags="$flags $1"
shift
;;
*)
break
;;
esac
done
if [ $# -eq 1 ]; then
# One file given, compare compressed to uncompressed
files="$1"
check_suffix "$1" files filt
if [ -z "$filt" ]; then
echo "z$prog: unknown suffix" 1>&2
exit 1
fi
$filt -- "$1" | $prog $flags -- - "$files"
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status=$?
elif [ $# -eq 2 ]; then
# Two files given, compare the two uncompressing as needed
check_suffix "$1" files filt
check_suffix "$2" files2 filt2
if [ -z "$filt" -a -z "$filt2" ]; then
$prog $flags -- "$1" "$2"
elif [ -z "$filt" -a -n "$filt2" -a "$1" != "-" ]; then
$filt2 -- "$2" | $prog $flags -- "$1" -
elif [ -n "$filt" -a -z "$filt2" -a "$2" != "-" ]; then
$filt -- "$1" | $prog $flags -- - "$2"
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else
tmp=`mktemp -t z$prog.XXXXXXXXXX` || exit 1
trap "rm -f $tmp" 0 1 2 3 13 15
${filt2:-cat} -- "$2" > $tmp || exit $?
${filt:-cat} -- "$1" | $prog $flags -- - "$tmp"
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fi
status=$?
else
echo "$USAGE" 1>&2
exit 1
fi
exit $status