zdiff.in   [plain text]

#!/bin/sh
# sh is buggy on RS/6000 AIX 3.2. Replace above line with #!/bin/ksh

# Copyright (C) 1998, 2002, 2006, 2007 Free Software Foundation
# Copyright (C) 1993 Jean-loup Gailly

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

PATH=BINDIR:$PATH

case $1 in
  --__cmp) shift
	prog=cmp;  cmp='${CMP-cmp}'  ;;
  *)    prog=diff; cmp='${DIFF-diff}';;
esac

version="z$prog (gzip) @VERSION@
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software.  You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.

Written by Jean-loup Gailly."

usage="Usage: $0 [OPTION]... FILE1 [FILE2]
Compare FILE1 to FILE2, using their uncompressed contents if they are
compressed.  If FILE2 is omitted, compare FILE1 to the uncompressed
contents of FILE1.gz.  Do comparisons like '$prog' does.

OPTIONs are the same as for '$prog'.

Report bugs to <bug-gzip@gnu.org>."

# sed script to escape all ' for the shell, and then (to handle trailing
# newlines correctly) turn trailing X on last line into '.
escape='
  s/'\''/'\''\\'\'''\''/g
  $s/X$/'\''/
'

while :; do
  case $1 in
  --h*) printf '%s\n' "$usage" || exit 2; exit;;
  --v*) echo "$version" || exit 2; exit;;
  --) shift; break;;
  -*\'*) cmp="$cmp '"`printf '%sX\n' "$1" | sed "$escape"`;;
  -?*) cmp="$cmp '$1'";;
  *) break;;
  esac
  shift
done
cmp="$cmp --"

for file
do
  test "X$file" = X- || <"$file" || exit 2
done

gzip_status=0
exec 3>&1

if test $# -eq 1; then
  case $1 in
  *[-.]gz* | *[-.][zZ] | *.t[ga]z)
    FILE=`expr "X$1" : 'X\(.*\)[-.][zZtga]*$'`
    gzip_status=$(
      exec 4>&1
      (gzip -cd -- "$1" 4>&-; echo $? >&4) 3>&- | eval "$cmp" - '"$FILE"' >&3
    );;
  *)
    echo >&2 "$0: $1: unknown compressed file extension"
    exit 2;;
  esac
elif test $# -eq 2; then
	case "$1" in
	*[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
                case "$2" in
		*[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
		    if test "$1$2" = --; then
			gzip_status=$(
			  exec 4>&1
			  (gzip -cdfq - 4>&-; echo $? >&4) 3>&- |
			    eval "$cmp" - - >&3
			)
		    elif
			# Reject Solaris 8's buggy /bin/bash 2.03.
			echo X |
			 (echo X | eval "$cmp" /dev/fd/5 - >/dev/null 2>&1) \
				5<&0
		    then
			gzip_status=$(
			  exec 4>&1
			  (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
			    ( (gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null |
			       eval "$cmp" /dev/fd/5 -) 5<&0
			)
			case $gzip_status in
			  *[1-9]*) gzip_status=1;;
			  *) gzip_status=0;;
			esac
		    else
			F=`expr "/$2" : '.*/\(.*\)[-.][zZtga]*$'` || F=$prog
			tmp=
			trap '
			  test -n "$tmp" && rm -f "$tmp"
			  (exit 2); exit 2
			' HUP INT PIPE TERM 0
			if type mktemp >/dev/null 2>&1; then
			  tmp=`mktemp -t -- "$F.XXXXXX"` || exit 2
			else
			  set -C
			  tmp=${TMPDIR-/tmp}/$F.$$
			fi
			gzip -cdfq -- "$2" > "$tmp" || exit 2
			gzip_status=$(
			  exec 4>&1
			  (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
			    eval "$cmp" - '"$tmp"' >&3
			)
                        cmp_status=$?
			rm -f "$tmp" || gzip_status=$?
			trap - HUP INT PIPE TERM 0
			(exit $cmp_status)
		    fi;;
		*)
		    gzip_status=$(
		      exec 4>&1
		      (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
		        eval "$cmp" - '"$2"' >&3
		    );;
                esac;;
        *)      case "$2" in
		*[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
			gzip_status=$(
			  exec 4>&1
			  (gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- |
			    eval "$cmp" '"$1"' - >&3
			);;
		*)	eval "$cmp" '"$1"' '"$2"';;
                esac;;
	esac
else
	echo >&2 "$0: invalid number of operands; try \`$0 --help' for help"
	exit 2
fi

cmp_status=$?
test "$gzip_status" -eq 0 || exit 2
exit $cmp_status