usr.bin/gzip/zdiff

   1 #!/bin/sh -
   2 #
   3 # $NetBSD: zdiff,v 1.3 2004/03/29 10:01:00 wiz Exp $
   4 # $OpenBSD: zdiff,v 1.2 2003/07/29 07:42:44 otto Exp $
   5 #
   6 #-
   7 # Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
   8 #
   9 # Permission to use, copy, modify, and distribute this software for any
  10 # purpose with or without fee is hereby granted, provided that the above
  11 # copyright notice and this permission notice appear in all copies.
  12 #
  13 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  14 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  16 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  19 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20 #
  21 # Sponsored in part by the Defense Advanced Research Projects
  22 # Agency (DARPA) and Air Force Research Laboratory, Air Force
  23 # Materiel Command, USAF, under agreement number F39502-99-1-0512.
  24 #
  25 # $FreeBSD$
  26
  27 # Set $prog based on $0
  28 case $0 in
  29         *cmp)   prog=cmp
  30                 ;;
  31         *)      prog=diff
  32                 ;;
  33 esac
  34 USAGE="usage: z$prog [options] file1 [file2]"
  35
  36 # Pull out any command line flags so we can pass them to diff/cmp
  37 # XXX - assumes there is no optarg
  38 flags=
  39 while test $# -ne 0; do
  40         case "$1" in
  41                 --)
  42                         shift
  43                         break
  44                         ;;
  45                 -*)
  46                         flags="$flags $1"
  47                         shift
  48                         ;;
  49                 *)
  50                         break
  51                         ;;
  52         esac
  53 done
  54
  55 if [ $# -eq 1 ]; then
  56         # One file given, compare compressed to uncompressed
  57         files="$1"
  58         case "$1" in
  59                 *[._-][Zz])
  60                         files="${1%??}"
  61                         ;;
  62                 *[._-]gz)
  63                         files="${1%???}"
  64                         ;;
  65                 *.t[ag]z)
  66                         files="${1%??}"ar
  67                         ;;
  68                 *)      echo "z$prog: unknown suffix" 1>&2
  69                         exit 1
  70         esac
  71         gzip -cdfq "$1" | $prog $flags - "$files"
  72         status=$?
  73 elif [ $# -eq 2 ]; then
  74         # Two files given, compare the two uncompressing as needed
  75         case "$1" in
  76                 *[._-][Zz]|*[._-]gz|*.t[ag]z)
  77                         files=-
  78                         filt="gzip -cdfq $1"
  79                         ;;
  80                 *)
  81                         files="$1"
  82                         ;;
  83         esac
  84         case "$2" in
  85                 *[._-][Zz]|*[._-]gz|*.t[ag]z)
  86                         if [ "$files" = "-" ]; then
  87                                 tmp=`mktemp -t z$prog.XXXXXXXXXX` || exit 1
  88                                 trap "rm -f $tmp" 0 1 2 3 13 15
  89                                 gzip -cdfq "$2" > $tmp
  90                                 files="$files $tmp"
  91                         else
  92                                 files="$files -"
  93                                 filt="gzip -cdfq $2"
  94                         fi
  95                         ;;
  96                 *)
  97                         files="$files $2"
  98                         ;;
  99         esac
 100         if [ -n "$filt" ]; then
 101                 $filt | $prog $flags $files
 102         else
 103                 $prog $flags $files
 104         fi
 105         status=$?
 106 else
 107         echo "$USAGE" 1>&2
 108         exit 1
 109 fi
 110
 111 exit $status