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
  18 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19
  20 case $1 in
  21   --__cmp) shift
  22         prog=cmp;  cmp='${CMP-cmp}'  ;;
  23   *)    prog=diff; cmp='${DIFF-diff}';;
  24 esac
  25
  26 version="z$prog (gzip) @VERSION@
  27 Copyright (C) 2024 Free Software Foundation, Inc.
  28 This is free software.  You may redistribute copies of it under the terms of
  29 the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.
  30 There is NO WARRANTY, to the extent permitted by law.
  31
  32 Written by Jean-loup Gailly."
  33
  34 usage="Usage: $0 [OPTION]... FILE1 [FILE2]
  35 Compare FILE1 to FILE2, using their uncompressed contents if they are
  36 compressed.  If FILE2 is omitted, compare FILE1 to the uncompressed
  37 contents of FILE1.gz.  Do comparisons like '$prog' does.
  38
  39 OPTIONs are the same as for '$prog'.
  40
  41 Report bugs to <bug-gzip@gnu.org>."
  42
  43 # sed script to escape all ' for the shell, and then (to handle trailing
  44 # newlines correctly) turn trailing X on last line into '.
  45 escape='
  46   s/'\''/'\''\\'\'''\''/g
  47   $s/X$/'\''/
  48 '
  49
  50 filesonly=
  51 file1=
  52 file2=
  53 needop=
  54
  55 for arg
  56 do
  57   case $filesonly$needop$arg in
  58   --h*) printf '%s\n' "$usage"   || exit 2; exit;;
  59   --v*) printf '%s\n' "$version" || exit 2; exit;;
  60   --) filesonly=t;;
  61   -*\'*) cmp="$cmp '"`printf '%sX\n' "$arg" | LC_ALL=C sed "$escape"`;;
  62   -[CDFISUWXx]) needop="'$arg'";;
  63   -?*) cmp="$cmp '$arg'";;
  64   *) case $needop in
  65      '') case $arg in
  66          '') printf >&2 '%s\n' "$0: empty file name"; exit 2;;
  67          esac
  68          case $file1 in
  69          '') file1=$arg;;
  70          *) case $file2 in
  71             '') file2=$arg;;
  72             *) printf >&2 '%s\n' "$0: extra operand '$arg'"; exit 2;;
  73             esac;;
  74          esac;;
  75      *) cmp="$cmp $needop '$arg'"
  76         needop=;;
  77      esac;;
  78   esac
  79 done
  80 case $needop in
  81 '') ;;
  82 *) printf >&2 '%s\n' "$0: $prevarg: option requires an argument -- $needop"
  83    exit 2;;
  84 esac
  85
  86 cmp="$cmp --"
  87
  88 case $file1 in
  89 '') printf >&2 '%s\n' "$0: missing operand"; exit 2;;
  90 -) ;;
  91 *) <"$file1" || exit 2;;
  92 esac
  93 case $file2 in
  94 ''|-) ;;
  95 *) <"$file2" || exit 2;;
  96 esac
  97
  98 gzip_status=0
  99 exec 3>&1
 100
 101 case $file2 in
 102 '')
 103   case $file1 in
 104   *[-.]gz* | *[-.][zZ] | *.t[ga]z)
 105     FILE=`LC_ALL=C expr "X$file1" : 'X\(.*\)[-.][zZtga]*$'`
 106     gzip_status=$(
 107       exec 4>&1
 108       ('gzip' -cd -- "$file1" 4>&-; echo $? >&4) 3>&- |
 109         eval "$cmp" - '"$FILE"' >&3
 110     );;
 111   *)
 112     printf >&2 '%s\n' "$0: $file1: unknown compressed file extension"
 113     exit 2;;
 114   esac;;
 115 *)
 116   case $file1,$file2 in
 117   -,-)
 118         gzip_status=$(
 119           exec 4>&1
 120           ('gzip' -cdfq - 4>&-; echo $? >&4) 3>&- |
 121             eval "$cmp" - - >&3
 122         );;
 123   *)
 124         case $file1 in
 125         *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
 126                 case $file2 in
 127                 *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
 128                     if
 129                         # Reject Solaris 8's buggy /bin/bash 2.03.
 130                         echo X |
 131                          (echo X | eval "$cmp" /dev/fd/5 - >/dev/null 2>&1) \
 132                                 5<&0
 133                     then
 134                         gzip_status=$(
 135                           exec 4>&1
 136                           ('gzip' -cdfq -- "$file1" 4>&-; echo $? >&4) 3>&- |
 137                               (('gzip' -cdfq -- "$file2" 4>&-
 138                                 echo $? >&4) 3>&- 5<&- </dev/null |
 139                                eval "$cmp" /dev/fd/5 - >&3) 5<&0
 140                         )
 141                         cmp_status=$?
 142                         case $gzip_status in
 143                           *[1-9]*) gzip_status=1;;
 144                           *) gzip_status=0;;
 145                         esac
 146                         (exit $cmp_status)
 147                     else
 148                         tmp=
 149                         trap '
 150                           test -n "$tmp" && rm -f "$tmp"
 151                           (exit 2); exit 2
 152                         ' HUP INT PIPE TERM 0
 153                         case $TMPDIR in
 154                           / | /*/) ;;
 155                           /*) TMPDIR=$TMPDIR/;;
 156                           *) TMPDIR=/tmp/;;
 157                         esac
 158                         if type mktemp >/dev/null 2>&1; then
 159                           tmp=`mktemp "${TMPDIR}zdiffXXXXXXXXX"` ||
 160                             exit 2
 161                         else
 162                           set -C
 163                           tmp=${TMPDIR}zdiff$$
 164                         fi
 165                         'gzip' -cdfq -- "$file2" > "$tmp" || exit 2
 166                         gzip_status=$(
 167                           exec 4>&1
 168                           ('gzip' -cdfq -- "$file1" 4>&-; echo $? >&4) 3>&- |
 169                             eval "$cmp" - '"$tmp"' >&3
 170                         )
 171                         cmp_status=$?
 172                         rm -f "$tmp" || gzip_status=$?
 173                         trap - HUP INT PIPE TERM 0
 174                         (exit $cmp_status)
 175                     fi;;
 176                 *)
 177                     gzip_status=$(
 178                       exec 4>&1
 179                       ('gzip' -cdfq -- "$file1" 4>&-; echo $? >&4) 3>&- |
 180                         eval "$cmp" - '"$file2"' >&3
 181                     );;
 182                 esac;;
 183         *)      case $file2 in
 184                 *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
 185                         gzip_status=$(
 186                           exec 4>&1
 187                           ('gzip' -cdfq -- "$file2" 4>&-; echo $? >&4) 3>&- |
 188                             eval "$cmp" '"$file1"' - >&3
 189                         );;
 190                 *)      eval "$cmp" '"$file1"' '"$file2"';;
 191                 esac;;
 192         esac;;
 193   esac;;
 194 esac
 195
 196 cmp_status=$?
 197 test "$gzip_status" -eq 0 || exit 2
 198 exit $cmp_status