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