zdiff.in

   1 #!/bin/sh
   2 # sh is buggy on RS/6000 AIX 3.2. Replace above line with #!/bin/ksh
   3
   4 # Copyright (C) 1998, 2002, 2006-2007, 2009-2017 Free Software Foundation, Inc.
   5 # Copyright (C) 1993 Jean-loup Gailly
   6
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16
  17 # You should have received a copy of the GNU General Public License along
  18 # with this program; if not, write to the Free Software Foundation, Inc.,
  19 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20
  21 case $1 in
  22   --__cmp) shift
  23         prog=cmp;  cmp='${CMP-cmp}'  ;;
  24   *)    prog=diff; cmp='${DIFF-diff}';;
  25 esac
  26
  27 version="z$prog (gzip) @VERSION@
  28 Copyright (C) 2009, 2011-2017 Free Software Foundation, Inc.
  29 This is free software.  You may redistribute copies of it under the terms of
  30 the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.
  31 There is NO WARRANTY, to the extent permitted by law.
  32
  33 Written by Jean-loup Gailly."
  34
  35 usage="Usage: $0 [OPTION]... FILE1 [FILE2]
  36 Compare FILE1 to FILE2, using their uncompressed contents if they are
  37 compressed.  If FILE2 is omitted, compare FILE1 to the uncompressed
  38 contents of FILE1.gz.  Do comparisons like '$prog' does.
  39
  40 OPTIONs are the same as for '$prog'.
  41
  42 Report bugs to <bug-gzip@gnu.org>."
  43
  44 # sed script to escape all ' for the shell, and then (to handle trailing
  45 # newlines correctly) turn trailing X on last line into '.
  46 escape='
  47   s/'\''/'\''\\'\'''\''/g
  48   $s/X$/'\''/
  49 '
  50
  51 while :; do
  52   case $1 in
  53   --h*) printf '%s\n' "$usage"   || exit 2; exit;;
  54   --v*) printf '%s\n' "$version" || exit 2; exit;;
  55   --) shift; break;;
  56   -*\'*) cmp="$cmp '"`printf '%sX\n' "$1" | sed "$escape"`;;
  57   -?*) cmp="$cmp '$1'";;
  58   *) break;;
  59   esac
  60   shift
  61 done
  62 cmp="$cmp --"
  63
  64 for file
  65 do
  66   test "X$file" = X- || <"$file" || exit 2
  67 done
  68
  69 gzip_status=0
  70 exec 3>&1
  71
  72 if test $# -eq 1; then
  73   case $1 in
  74   *[-.]gz* | *[-.][zZ] | *.t[ga]z)
  75     FILE=`expr "X$1" : 'X\(.*\)[-.][zZtga]*$'`
  76     gzip_status=$(
  77       exec 4>&1
  78       (gzip -cd -- "$1" 4>&-; echo $? >&4) 3>&- | eval "$cmp" - '"$FILE"' >&3
  79     );;
  80   *)
  81     printf >&2 '%s\n' "$0: $1: unknown compressed file extension"
  82     exit 2;;
  83   esac
  84 elif test $# -eq 2; then
  85         case "$1" in
  86         *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
  87                 case "$2" in
  88                 *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
  89                     if test "$1$2" = --; then
  90                         gzip_status=$(
  91                           exec 4>&1
  92                           (gzip -cdfq - 4>&-; echo $? >&4) 3>&- |
  93                             eval "$cmp" - - >&3
  94                         )
  95                     elif
  96                         # Reject Solaris 8's buggy /bin/bash 2.03.
  97                         echo X |
  98                          (echo X | eval "$cmp" /dev/fd/5 - >/dev/null 2>&1) \
  99                                 5<&0
 100                     then
 101                         gzip_status=$(
 102                           exec 4>&1
 103                           (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
 104                             ( (gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null |
 105                                eval "$cmp" /dev/fd/5 - >&3) 5<&0
 106                         )
 107                         cmp_status=$?
 108                         case $gzip_status in
 109                           *[1-9]*) gzip_status=1;;
 110                           *) gzip_status=0;;
 111                         esac
 112                         (exit $cmp_status)
 113                     else
 114                         tmp=
 115                         trap '
 116                           test -n "$tmp" && rm -f "$tmp"
 117                           (exit 2); exit 2
 118                         ' HUP INT PIPE TERM 0
 119                         if type mktemp >/dev/null 2>&1; then
 120                           tmp=`mktemp` || exit 2
 121                         else
 122                           F=`expr "/$2" : '.*/\(.*\)[-.][zZtga]*$'` || F=$prog
 123                           set -C
 124                           tmp=${TMPDIR-/tmp}/$F.$$
 125                         fi
 126                         gzip -cdfq -- "$2" > "$tmp" || exit 2
 127                         gzip_status=$(
 128                           exec 4>&1
 129                           (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
 130                             eval "$cmp" - '"$tmp"' >&3
 131                         )
 132                         cmp_status=$?
 133                         rm -f "$tmp" || gzip_status=$?
 134                         trap - HUP INT PIPE TERM 0
 135                         (exit $cmp_status)
 136                     fi;;
 137                 *)
 138                     gzip_status=$(
 139                       exec 4>&1
 140                       (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
 141                         eval "$cmp" - '"$2"' >&3
 142                     );;
 143                 esac;;
 144         *)      case "$2" in
 145                 *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
 146                         gzip_status=$(
 147                           exec 4>&1
 148                           (gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- |
 149                             eval "$cmp" '"$1"' - >&3
 150                         );;
 151                 *)      eval "$cmp" '"$1"' '"$2"';;
 152                 esac;;
 153         esac
 154 else
 155         printf >&2 '%s\n' \
 156           "$0: invalid number of operands; try \`$0 --help' for help"
 157         exit 2
 158 fi
 159
 160 cmp_status=$?
 161 test "$gzip_status" -eq 0 || exit 2
 162 exit $cmp_status