#!/bin/sh
#
# Copyright (c) April 1996 Wolfram Schneider <wosch@FreeBSD.org>. Berlin.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL [your name] OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# zgrep - search possibly compressed files for a regular expression
#
# $FreeBSD: src/gnu/usr.bin/gzip/zgrep.getopt,v 1.7 1999/08/27 23:35:55 peter Exp $
# $DragonFly: src/gnu/usr.bin/gzip/Attic/zgrep.getopt,v 1.2 2003/06/17 04:25:46 dillon Exp $


PATH=/bin:/usr/bin:$PATH; export PATH

# grep variant
case "$0" in
	*egrep)	grep=${EGREP-egrep}	;;
	*fgrep)	grep=${FGREP-fgrep}	;;
	*)	grep=${GREP-grep}	;;
esac

gzip=gzip gzipopt="-cdfq" pattern= grepopt= files= line= header=

# check options
while getopts "0123456789A:B:CEFGVX:bce:f:hiLlnqsvwxy" option
do
	case "$option" in
		e|f) 	pattern="-$option $OPTARG";;	# -f file
		l|L) 	line=-$option;   grepopt="$grepopt -$option";;
		h|q) 	header=-h; grepopt="$grepopt -$option";;
		# rest
		[0-9CEFGVbchiLlnqsvwxy]) grepopt="$grepopt -$option";; 
		[ABXef]) grepopt="$grepopt -$option $OPTARG";;
	esac
done
shift $(($OPTIND - 1))

# check pattern
case X"$pattern" in
	X) case $# in 
		0) echo "usage: $0 [grep_options] pattern [files]"; exit 1;; 
		*) pattern=$1; shift;;
	   esac
esac


files="$@"	
# no shell loop neccessary for option -q or -h 
# and a single file or reading from stdin
case "$header"X"$#" in 
	-h*|-q*|X0|X1) 	$gzip $gzipopt -- $files | $grep $grepopt -- "$pattern"
			exit $?;; 
esac

for f in $files
do
	case "$line" in
		-l) if $gzip $gzipopt -- $f | 
			    $grep $grepopt -- "$pattern" >/dev/null
		    then 
			echo $f
		    fi
		    ;;
		-L) if $gzip $gzipopt -- $f | 
			$grep $grepopt -- "$pattern" >/dev/null; then :
		    else 
			echo $f
		    fi
		    ;;

		*)  $gzip $gzipopt -- $f | $grep $grepopt -- "$pattern" | 
			sed "s%^%${f}:%"
		    ;;
	esac
done