bzip3-rs 1.2.0

#!/bin/sh
# Copyright (C) 2026 The bzip3-rs contributors.
# SPDX-License-Identifier: Apache-2.0
# Licensed under the Apache License, Version 2.0 <https://www.apache.org/licenses/LICENSE-2.0>
# bz3more: page possibly compressed files.
# Written from scratch for bzip3-rs. Mirrors the behavior of the
# bzip2 bzmore wrapper with .bz2 replaced by .bz3.

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

# Write the plain form of "$1" to stdout.
# Uses bzip3 when the file starts with the BZ3v1 magic.
# Uses cat for all other files.
plain() {
	f="$1"
	if [ "$(head -c 5 -- "$f" 2>/dev/null)" = "BZ3v1" ]; then
		bzip3 -dcfq -- "$f"
	else
		cat -- "$f"
	fi
}

prog=`echo "$0" | sed 's|.*/||'`
case "$prog" in
	*less)	more=less	;;
	*most)	more=most	;;
	*)	more=more	;;
esac

if test "`echo -n a`" = "-n a"; then
	n1=''; n2='\c'
else
	n1='-n'; n2=''
fi
oldtty=`stty -g 2>/dev/null`
if stty -cbreak 2>/dev/null; then
	cb='cbreak'; ncb='-cbreak'
else
	cb='min 1 -icanon'; ncb='icanon eof ^d'
fi
if test $? -eq 0 -a -n "$oldtty"; then
	trap 'stty $oldtty 2>/dev/null; exit' 0 2 3 5 10 13 15
else
	trap 'stty $ncb echo 2>/dev/null; exit' 0 2 3 5 10 13 15
fi

if test $# = 0; then
	if test -t 0; then
		echo "usage: $prog files..."
	else
		tmp=`mktemp "${TMPDIR:-/tmp}"/bz3more.XXXXXXXXXX` || exit 1
		cat > "$tmp"
		plain "$tmp" | eval "$more"
		r=$?
		rm -f "$tmp"
		exit $r
	fi
else
	FIRST=1
	for FILE
	do
		if test $FIRST -eq 0; then
			echo $n1 "--More--(Next file: $FILE)$n2"
			stty $cb -echo 2>/dev/null
			ANS=`dd bs=1 count=1 2>/dev/null`
			stty $ncb echo 2>/dev/null
			echo " "
			if test "$ANS" = 'e' -o "$ANS" = 'q'; then
				exit
			fi
		fi
		if test "$ANS" != 's'; then
			echo "------> $FILE <------"
			plain "$FILE" | eval "$more"
		fi
		if test -t; then
			FIRST=0
		fi
	done
fi