NetBSD/usr.bin/gzip/zmore

#!/bin/sh -
#
# $NetBSD: zmore,v 1.5 2013/12/06 13:33:15 pettai Exp $
#
# $OpenBSD: zmore,v 1.6 2008/08/20 09:22:02 mpf Exp $
#
# Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# Sponsored in part by the Defense Advanced Research Projects
# Agency (DARPA) and Air Force Research Laboratory, Air Force
# Materiel Command, USAF, under agreement number F39502-99-1-0512.
#

# Pull out any command line flags so we can pass them to more/less
flags=
while test $# -ne 0; do
	case "$1" in
		--)
			shift
			break
			;;
		-*)
			flags="$flags $1"
			shift
			;;
		*)
			break
			;;
	esac
done

if [ `basename $0` = "zless" ] ; then
	pager=${PAGER-less}
else
	pager=${PAGER-more}
fi

# No files means read from stdin
if [ $# -eq 0 ]; then
	gzip -cdfq 2>&1 | $pager $flags
	exit 0
fi

oterm=`stty -g 2>/dev/null`
while test $# -ne 0; do
	gzip -cdfq "$1" 2>&1 | $pager $flags
	prev="$1"
	shift
	if tty -s && test -n "$oterm" -a $# -gt 0; then
		#echo -n "--More--(Next file: $1)"
		echo -n "$prev (END) - Next: $1 "
		trap "stty $oterm 2>/dev/null" 0 1 2 3 13 15
		stty cbreak -echo 2>/dev/null
		REPLY=`dd bs=1 count=1 2>/dev/null`
		stty $oterm 2>/dev/null
		trap - 0 1 2 3 13 15
		echo
		case "$REPLY" in
			s)
				shift
				;;
			e|q)
				break
				;;
		esac
	fi
done
exit 0