usr.bin/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 # 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
  28 case $0 in
  29         *cmp)   prog=cmp
  30                 ;;
  31         *)      prog=diff
  32                 ;;
  33 esac
  34 USAGE="usage: $0 [options] file1 [file2]"
  35
  36 check_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
  88 flags=
  89 while 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
 106 done
 107
 108 if [ $# -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=$?
 118 elif [ $# -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=$?
 135 else
 136         echo "$USAGE" 1>&2
 137         exit 1
 138 fi
 139
 140 exit $status