usr.bin/gzip/zdiff

   1 #!/bin/sh -
   2 #
   3 # $NetBSD: zdiff,v 1.2 2003/12/28 12:43:43 wiz Exp $
   4 # $DragonFly: src/usr.bin/gzip/zdiff,v 1.1 2004/10/26 11:19:31 joerg Exp $
   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 #
   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
  26 # Set $prog based on $0
  27 case $0 in
  28         *cmp)   prog=cmp
  29                 ;;
  30         *)      prog=diff
  31                 ;;
  32 esac
  33 USAGE="usage: z$prog [options] file1 [file2]"
  34
  35 # Pull out any command line flags so we can pass them to diff/cmp
  36 # XXX - assumes there is no optarg
  37 flags=
  38 while test $# -ne 0; do
  39         case "$1" in
  40                 --)
  41                         shift
  42                         break
  43                         ;;
  44                 -*)
  45                         flags="$flags $1"
  46                         shift
  47                         ;;
  48                 *)
  49                         break
  50                         ;;
  51         esac
  52 done
  53
  54 if [ $# -eq 1 ]; then
  55         # One file given, compare compressed to uncompressed
  56         files="$1"
  57         case "$1" in
  58                 *[._-][Zz])
  59                         files="${1%??}"
  60                         ;;
  61                 *[._-]gz)
  62                         files="${1%???}"
  63                         ;;
  64                 *.t[ag]z)
  65                         files="${1%??}"ar
  66                         ;;
  67                 *)      echo "z$prog: unknown suffix" 1>&2
  68                         exit 1
  69         esac
  70         gzip -cdfq "$1" | $prog $flags - "$files"
  71         status=$?
  72 elif [ $# -eq 2 ]; then
  73         # Two files given, compare the two uncompressing as needed
  74         case "$1" in
  75                 *[._-][Zz]|*[._-]gz|*.t[ag]z)
  76                         files=-
  77                         filt="gzip -cdfq $1"
  78                         ;;
  79                 *)
  80                         files="$1"
  81                         ;;
  82         esac
  83         case "$2" in
  84                 *[._-][Zz]|*[._-]gz|*.t[ag]z)
  85                         if [ "$files" = "-" ]; then
  86                                 tmp=`mktemp -t z$prog.XXXXXXXXXX` || exit 1
  87                                 trap "rm -f $tmp" 0 1 2 3 13 15
  88                                 gzip -cdfq "$2" > $tmp
  89                                 files="$files $tmp"
  90                         else
  91                                 files="$files -"
  92                                 filt="gzip -cdfq $2"
  93                         fi
  94                         ;;
  95                 *)
  96                         files="$files $2"
  97                         ;;
  98         esac
  99         if [ -n "$filt" ]; then
 100                 $filt | $prog $flags $files
 101         else
 102                 $prog $flags $files
 103         fi
 104         status=$?
 105 else
 106         echo "$USAGE" 1>&2
 107         exit 1
 108 fi
 109
 110 exit $status