git.gag.com Git - debian/gzip/blob - 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 Free Software Foundation
   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 bindir=@bindir@
  22 case $1 in
  23 --__bindir) bindir=${2?}; shift; shift;;
  24 esac
  25 PATH=$bindir:$PATH
  26
  27 case $1 in
  28   --__cmp) shift
  29         prog=cmp;  cmp='${CMP-cmp}'  ;;
  30   *)    prog=diff; cmp='${DIFF-diff}';;
  31 esac
  32
  33 version="z$prog (gzip) @VERSION@
  34 Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
  35 This is free software.  You may redistribute copies of it under the terms of
  36 the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
  37 There is NO WARRANTY, to the extent permitted by law.
  38
  39 Written by Jean-loup Gailly."
  40
  41 usage="Usage: $0 [OPTION]... FILE1 [FILE2]
  42 Compare FILE1 to FILE2, using their uncompressed contents if they are
  43 compressed.  If FILE2 is omitted, compare FILE1 to the uncompressed
  44 contents of FILE1.gz.  Do comparisons like '$prog' does.
  45
  46 OPTIONs are the same as for '$prog'.
  47
  48 Report bugs to <bug-gzip@gnu.org>."
  49
  50 # sed script to escape all ' for the shell, and then (to handle trailing
  51 # newlines correctly) turn trailing X on last line into '.
  52 escape='
  53   s/'\''/'\''\\'\'''\''/g
  54   $s/X$/'\''/
  55 '
  56
  57 while :; do
  58   case $1 in
  59   --h*) printf '%s\n' "$usage" || exit 2; exit;;
  60   --v*) echo "$version" || exit 2; exit;;
  61   --) shift; break;;
  62   -*\'*) cmp="$cmp '"`printf '%sX\n' "$1" | sed "$escape"`;;
  63   -?*) cmp="$cmp '$1'";;
  64   *) break;;
  65   esac
  66   shift
  67 done
  68 cmp="$cmp --"
  69
  70 for file
  71 do
  72   test "X$file" = X- || <"$file" || exit 2
  73 done
  74
  75 gzip_status=0
  76 exec 3>&1
  77
  78 if test $# -eq 1; then
  79   type_file=$(file -b --mime-type "$1")
  80
  81   case $type_file in
  82   application/x-gzip | application/x-compress)
  83     FILE=`expr "X$1" : 'X\(.*\)[-.][zZtga]*$'`
  84     if test "$FILE" == ""; then
  85         FILE="$1"
  86     fi;
  87
  88     gzip_status=$(
  89       exec 4>&1
  90       (gzip -cd -- "$1" 4>&-; echo $? >&4) 3>&- | eval "$cmp" - '"$FILE"' >&3
  91     );;
  92   *)
  93     echo >&2 "$0: $1: unknown compressed file extension"
  94     exit 2;;
  95   esac
  96 elif test $# -eq 2; then
  97         type_file1=$(file -b --mime-type "$1")
  98         type_file2=$(file -b --mime-type "$2")
  99
 100         case "$type_file1" in
 101         application/x-gzip | application/x-compress)
 102                 case "$type_file2" in
 103                 application/x-gzip | application/x-compress)
 104                     if test "$1$2" = --; then
 105                         gzip_status=$(
 106                           exec 4>&1
 107                           (gzip -cdfq - 4>&-; echo $? >&4) 3>&- |
 108                             eval "$cmp" - - >&3
 109                         )
 110                     elif
 111                         # Reject Solaris 8's buggy /bin/bash 2.03.
 112                         echo X |
 113                          (echo X | eval "$cmp" /dev/fd/5 - >/dev/null 2>&1) \
 114                                 5<&0
 115                     then
 116                         gzip_status=$(
 117                           exec 4>&1
 118                           (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
 119                             ( (gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null |
 120                                eval "$cmp" /dev/fd/5 - >&3) 5<&0
 121                         )
 122                         cmp_status=$?
 123                         case $gzip_status in
 124                           *[1-9]*) gzip_status=1;;
 125                           *) gzip_status=0;;
 126                         esac
 127                         (exit $cmp_status)
 128                     else
 129                         F=`expr "/$2" : '.*/\(.*\)[-.][zZtga]*$'` || F=$prog
 130                         if test "$F" == ""; then
 131                             F="$2"
 132                         fi;
 133                         tmp=
 134                         trap '
 135                           test -n "$tmp" && rm -f "$tmp"
 136                           (exit 2); exit 2
 137                         ' HUP INT PIPE TERM 0
 138                         if type mktemp >/dev/null 2>&1; then
 139                           tmp=`mktemp -t -- "$F.XXXXXX"` || exit 2
 140                         else
 141                           set -C
 142                           tmp=${TMPDIR-/tmp}/$F.$$
 143                         fi
 144                         gzip -cdfq -- "$2" > "$tmp" || exit 2
 145                         gzip_status=$(
 146                           exec 4>&1
 147                           (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
 148                             eval "$cmp" - '"$tmp"' >&3
 149                         )
 150                         cmp_status=$?
 151                         rm -f "$tmp" || gzip_status=$?
 152                         trap - HUP INT PIPE TERM 0
 153                         (exit $cmp_status)
 154                     fi;;
 155                 *)
 156                     gzip_status=$(
 157                       exec 4>&1
 158                       (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
 159                         eval "$cmp" - '"$2"' >&3
 160                     );;
 161                 esac;;
 162         *)      case "$type_file2" in
 163                 application/x-gzip | application/x-compress)
 164                         gzip_status=$(
 165                           exec 4>&1
 166                           (gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- |
 167                             eval "$cmp" '"$1"' - >&3
 168                         );;
 169                 *)      eval "$cmp" '"$1"' '"$2"';;
 170                 esac;;
 171         esac
 172 else
 173         echo >&2 "$0: invalid number of operands; try \`$0 --help' for help"
 174         exit 2
 175 fi
 176
 177 cmp_status=$?
 178 test "$gzip_status" -eq 0 || exit 2
 179 exit $cmp_status