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, 2009-2024 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) 2024 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 filesonly=
  52 file1=
  53 file2=
  54 needop=
  55
  56 for arg
  57 do
  58   case $filesonly$needop$arg in
  59   --h*) printf '%s\n' "$usage"   || exit 2; exit;;
  60   --v*) printf '%s\n' "$version" || exit 2; exit;;
  61   --) filesonly=t;;
  62   -*\'*) cmp="$cmp '"`printf '%sX\n' "$arg" | LC_ALL=C sed "$escape"`;;
  63   -[CDFISUWXx]) needop="'$arg'";;
  64   -?*) cmp="$cmp '$arg'";;
  65   *) case $needop in
  66      '') case $arg in
  67          '') printf >&2 '%s\n' "$0: empty file name"; exit 2;;
  68          esac
  69          case $file1 in
  70          '') file1=$arg;;
  71          *) case $file2 in
  72             '') file2=$arg;;
  73             *) printf >&2 '%s\n' "$0: extra operand '$arg'"; exit 2;;
  74             esac;;
  75          esac;;
  76      *) cmp="$cmp $needop '$arg'"
  77         needop=;;
  78      esac;;
  79   esac
  80 done
  81 case $needop in
  82 '') ;;
  83 *) printf >&2 '%s\n' "$0: $prevarg: option requires an argument -- $needop"
  84    exit 2;;
  85 esac
  86
  87 cmp="$cmp --"
  88
  89 case $file1 in
  90 '') printf >&2 '%s\n' "$0: missing operand"; exit 2;;
  91 -) ;;
  92 *) <"$file1" || exit 2;;
  93 esac
  94 case $file2 in
  95 ''|-) ;;
  96 *) <"$file2" || exit 2;;
  97 esac
  98
  99 gzip_status=0
 100 exec 3>&1
 101
 102 case $file2 in
 103 '')
 104   case $file1 in
 105   *[-.]gz* | *[-.][zZ] | *.t[ga]z)
 106     FILE=`LC_ALL=C expr "X$file1" : 'X\(.*\)[-.][zZtga]*$'`
 107     gzip_status=$(
 108       exec 4>&1
 109       ('gzip' -cd -- "$file1" 4>&-; echo $? >&4) 3>&- |
 110         eval "$cmp" - '"$FILE"' >&3
 111     );;
 112   *)
 113     printf >&2 '%s\n' "$0: $file1: unknown compressed file extension"
 114     exit 2;;
 115   esac;;
 116 *)
 117   case $file1,$file2 in
 118   -,-)
 119         gzip_status=$(
 120           exec 4>&1
 121           ('gzip' -cdfq - 4>&-; echo $? >&4) 3>&- |
 122             eval "$cmp" - - >&3
 123         );;
 124   *)
 125         case $file1 in
 126         *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
 127                 case $file2 in
 128                 *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
 129                     if
 130                         # Reject Solaris 8's buggy /bin/bash 2.03.
 131                         echo X |
 132                          (echo X | eval "$cmp" /dev/fd/5 - >/dev/null 2>&1) \
 133                                 5<&0
 134                     then
 135                         gzip_status=$(
 136                           exec 4>&1
 137                           ('gzip' -cdfq -- "$file1" 4>&-; echo $? >&4) 3>&- |
 138                               (('gzip' -cdfq -- "$file2" 4>&-
 139                                 echo $? >&4) 3>&- 5<&- </dev/null |
 140                                eval "$cmp" /dev/fd/5 - >&3) 5<&0
 141                         )
 142                         cmp_status=$?
 143                         case $gzip_status in
 144                           *[1-9]*) gzip_status=1;;
 145                           *) gzip_status=0;;
 146                         esac
 147                         (exit $cmp_status)
 148                     else
 149                         tmp=
 150                         trap '
 151                           test -n "$tmp" && rm -f "$tmp"
 152                           (exit 2); exit 2
 153                         ' HUP INT PIPE TERM 0
 154                         case $TMPDIR in
 155                           / | /*/) ;;
 156                           /*) TMPDIR=$TMPDIR/;;
 157                           *) TMPDIR=/tmp/;;
 158                         esac
 159                         if type mktemp >/dev/null 2>&1; then
 160                           tmp=`mktemp "${TMPDIR}zdiffXXXXXXXXX"` ||
 161                             exit 2
 162                         else
 163                           set -C
 164                           tmp=${TMPDIR}zdiff$$
 165                         fi
 166                         'gzip' -cdfq -- "$file2" > "$tmp" || exit 2
 167                         gzip_status=$(
 168                           exec 4>&1
 169                           ('gzip' -cdfq -- "$file1" 4>&-; echo $? >&4) 3>&- |
 170                             eval "$cmp" - '"$tmp"' >&3
 171                         )
 172                         cmp_status=$?
 173                         rm -f "$tmp" || gzip_status=$?
 174                         trap - HUP INT PIPE TERM 0
 175                         (exit $cmp_status)
 176                     fi;;
 177                 *)
 178                     gzip_status=$(
 179                       exec 4>&1
 180                       ('gzip' -cdfq -- "$file1" 4>&-; echo $? >&4) 3>&- |
 181                         eval "$cmp" - '"$file2"' >&3
 182                     );;
 183                 esac;;
 184         *)      case $file2 in
 185                 *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
 186                         gzip_status=$(
 187                           exec 4>&1
 188                           ('gzip' -cdfq -- "$file2" 4>&-; echo $? >&4) 3>&- |
 189                             eval "$cmp" '"$file1"' - >&3
 190                         );;
 191                 *)      eval "$cmp" '"$file1"' '"$file2"';;
 192                 esac;;
 193         esac;;
 194   esac;;
 195 esac
 196
 197 cmp_status=$?
 198 test "$gzip_status" -eq 0 || exit 2
 199 exit $cmp_status