gzip/zdiff

   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 #-
   8 # Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
   9 # Copyright (c) 2010 Joerg Sonnenberger <joerg@NetBSD.org>
  10 #
  11 # Permission to use, copy, modify, and distribute this software for any
  12 # purpose with or without fee is hereby granted, provided that the above
  13 # copyright notice and this permission notice appear in all copies.
  14 #
  15 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  16 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  17 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  18 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  19 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  20 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  21 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22 #
  23 # Sponsored in part by the Defense Advanced Research Projects
  24 # Agency (DARPA) and Air Force Research Laboratory, Air Force
  25 # Materiel Command, USAF, under agreement number F39502-99-1-0512.
  26 #
  27 # $FreeBSD: src/usr.bin/gzip/zdiff,v 1.2 2011/05/23 09:02:44 delphij Exp $
  28
  29 # Set $prog based on $0
  30 case $0 in
  31         *cmp)   prog=cmp
  32                 ;;
  33         *)      prog=diff
  34                 ;;
  35 esac
  36 USAGE="usage: $0 [options] file1 [file2]"
  37
  38 check_suffix() {
  39         case "$1" in
  40         *[._-][Zz])
  41                 setvar $2 "${1%??}"
  42                 setvar $3 "gzip -cdqf"
  43                 ;;
  44         *[._-]bz)
  45                 setvar $2 "${1%???}"
  46                 setvar $3 "bzip2 -cdqf"
  47                 ;;
  48         *[._-]gz)
  49                 setvar $2 "${1%???}"
  50                 setvar $3 "gzip -cdqf"
  51                 ;;
  52         *[._-]xz)
  53                 setvar $2 "${1%???}"
  54                 setvar $3 "xz -cdqf"
  55                 ;;
  56         *[._-]bz2)
  57                 setvar $2 "${1%????}"
  58                 setvar $3 "bzip2 -cdqf"
  59                 ;;
  60         *[._-]lzma)
  61                 setvar $2 "${1%?????}"
  62                 setvar $3 "xz -cdqf"
  63                 ;;
  64         *.t[ag]z)
  65                 setvar $2 "${1%??}"ar
  66                 setvar $3 "gzip -cdqf"
  67                 ;;
  68         *.tbz)
  69                 setvar $2 "${1%??}"ar
  70                 setvar $3 "bzip2 -cdqf"
  71                 ;;
  72         *.tbz2)
  73                 setvar $2 "${1%???}"ar
  74                 setvar $3 "bzip2 -cdqf"
  75                 ;;
  76         *.t[lx]z)
  77                 setvar $2 "${1%??}"ar
  78                 setvar $3 "xz -cdqf"
  79                 ;;
  80         *)
  81                 setvar $2 "$1"
  82                 setvar $3 ""
  83                 ;;
  84         esac
  85 }
  86
  87
  88 # Pull out any command line flags so we can pass them to diff/cmp
  89 # XXX - assumes there is no optarg
  90 flags=
  91 while test $# -ne 0; do
  92         case "$1" in
  93                 --)
  94                         shift
  95                         break
  96                         ;;
  97                 -)
  98                         break
  99                         ;;
 100                 -*)
 101                         flags="$flags $1"
 102                         shift
 103                         ;;
 104                 *)
 105                         break
 106                         ;;
 107         esac
 108 done
 109
 110 if [ $# -eq 1 ]; then
 111         # One file given, compare compressed to uncompressed
 112         files="$1"
 113         check_suffix "$1" files filt
 114         if [ -z "$filt" ]; then
 115                 echo "z$prog: unknown suffix" 1>&2
 116                 exit 1
 117         fi
 118         $filt -- "$1" | $prog $flags -- - "$files"
 119         status=$?
 120 elif [ $# -eq 2 ]; then
 121         # Two files given, compare the two uncompressing as needed
 122         check_suffix "$1" files filt
 123         check_suffix "$2" files2 filt2
 124         if [ -z "$filt" -a -z "$filt2" ]; then
 125                 $prog $flags -- "$1" "$2"
 126         elif [ -z "$filt" -a -n "$filt2" -a "$1" != "-" ]; then
 127                 $filt2 -- "$2" | $prog $flags -- "$1" -
 128         elif [ -n "$filt" -a -z "$filt2" -a "$2" != "-" ]; then
 129                 $filt -- "$1" | $prog $flags -- - "$2"
 130         else
 131                 tmp=`mktemp -t z$prog.XXXXXXXXXX` || exit 1
 132                 trap "rm -f $tmp" 0 1 2 3 13 15
 133                 ${filt2:-cat} -- "$2" > $tmp || exit $?
 134                 ${filt:-cat} -- "$1" | $prog $flags -- - "$tmp"
 135         fi
 136         status=$?
 137 else
 138         echo "$USAGE" 1>&2
 139         exit 1
 140 fi
 141
 142 exit $status