zdiff.in   [plain text]

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

# Zcmp and zdiff are used to invoke the cmp or the  diff  pro-
# gram  on compressed files.  All options specified are passed
# directly to cmp or diff.  If only 1 file is specified,  then
# the  files  compared  are file1 and an uncompressed file1.gz.
# If two files are specified, then they are  uncompressed  (if
# necessary) and fed to cmp or diff.  The exit status from cmp
# or diff is preserved.

PATH="BINDIR:$PATH"; export PATH
case "$0" in
  *cmp) prog=cmp ; cmp='${CMP-cmp}'  ;;
  *)    prog=diff; cmp='${DIFF-diff}';;
esac

version="z$prog (gzip) @VERSION@
Copyright (C) 2006 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: z$prog [OPTION]... FILE1 [FILE2]
Compare FILE1 to FILE2, using their uncompressed contents if they are
compressed.  If FILE2 is omitted, compare FILE1 to the uncompressed
contents of FILE1.gz.  Do comparisons like '$prog' does.

OPTIONs are the same as for '$prog'.

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

FILES=
while :; do
  case $1 in
  --h*) echo "$usage" || exit 2; exit;;
  --v*) echo "$version" || exit 2; exit;;
  --) shift; break;;
  -*\'*) echo >&2 "$prog: $1: option contains apostrophe"; exit 2;;
  -?*) cmp="$cmp '$1'"; shift;;
  *) break;;
  esac
done
cmp="$cmp --"

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

if test $# -eq 1; then
  case $1 in
  *[-.]gz* | *[-.][zZ] | *.t[ga]z)
    FILE=`expr "X$1" : 'X\(.*\)[-.][zZtga]*$'`
    gzip -cd -- "$1" | eval "$cmp" - '"$FILE"';;
  *)
    echo >&2 "$prog: $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$2" = --; then
			gzip -cdfq - | eval "$cmp" - -
		    elif test -r /dev/fd/3 3</dev/null; then
			gzip -cdfq -- "$1" |
			  (gzip -cdfq -- "$2" |
			   eval "$cmp" /dev/fd/3 -) 3<&0
		    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 -- "$F.XXXXXX"` || exit
			else
			  set -C
			  tmp=${TMPDIR-/tmp}/$F.$$
			fi
			gzip -cdfq -- "$2" > "$tmp" || exit
			gzip -cdfq -- "$1" | eval "$cmp" - '"$tmp"'
                        STAT="$?"
			rm -f "$tmp" || STAT=2
			trap - HUP INT PIPE TERM 0
			exit $STAT
		    fi;;
		*)	gzip -cdfq -- "$1" | eval "$cmp" - '"$2"';;
                esac;;
        *)      case "$2" in
		*[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
			gzip -cdfq -- "$2" | eval "$cmp" '"$1"' -;;
		*)	eval "$cmp" '"$1"' '"$2"';;
                esac;;
	esac
else
	echo >&2 "$usage"
	exit 2
fi