#!/bin/sh
#	$NetBSD: countmail,v 1.7 2008/04/28 20:22:53 martin Exp $

#
# Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Charles M. Hannum.
#
# 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 NETBSD FOUNDATION, INC. 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 THE FOUNDATION 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.
#

# Count the messages in your mailbox, using only POSIX shell builtins.
#
# Caveats:
#
# The read loop is horrendously slow on every implementation I've
# tried.  I suggest using from(1) and wc(1) instead, though these are
# not shell builtins.

# for krb.
#set -- `from -t`
#v=$3
set -- `from 2>/dev/null |wc -l`
v=$1
#v=`from | wc -l`

#v=0
#exec 0</var/mail/$USER
#while read line; do
#  case "$line" in
#    "From "*) v=$(($v + 1)) ;;
#  esac
#done
#exec 0<&-

set --
g=0
v=000$v

while :; do

  case $v in
    '' | 0 | 00) break ;;
    *000) ;;
    *)
      case $g in
	0) x= ;;
	1) x=THOUSAND ;;
	2) x=MILLION ;;
	3) x=BILLION ;;
	4) x=TRILLION ;;
	5) x=QUADRILLION ;;
	6) x=QUINTILLION ;;
	7) x=SEXTILLION ;;
	8) x=SEPTILLION ;;
	*)
	  echo "YOU HAVE TOO MUCH MAIL!" 1>&2
	  exit 1
	  ;;
      esac

      case $v in
	*10) y=TEN ;;
	*11) y=ELEVEN ;;
	*12) y=TWELVE ;;
	*13) y=THIRTEEN ;;
	*14) y=FOURTEEN ;;
	*15) y=FIFTEEN ;;
	*16) y=SIXTEEN ;;
	*17) y=SEVENTEEN ;;
	*18) y=EIGHTEEN ;;
	*19) y=NINETEEN ;;
	*2?) y=TWENTY ;;
	*3?) y=THIRTY ;;
	*4?) y=FORTY ;;
	*5?) y=FIFTY ;;
	*6?) y=SIXTY ;;
	*7?) y=SEVENTY ;;
	*8?) y=EIGHTY ;;
	*9?) y=NINETY ;;
	*) y= ;;
      esac

      case $v in
	*[01]? | *?0) ;;
	*) y=$y- ;;
      esac

      case $v in
	*1?) ;;
	*1) y=${y}ONE ;;
	*2) y=${y}TWO ;;
	*3) y=${y}THREE ;;
	*4) y=${y}FOUR ;;
	*5) y=${y}FIVE ;;
	*6) y=${y}SIX ;;
	*7) y=${y}SEVEN ;;
	*8) y=${y}EIGHT ;;
	*9) y=${y}NINE ;;
      esac

      case $v in
	*1??) z=ONE ;;
	*2??) z=TWO ;;
	*3??) z=THREE ;;
	*4??) z=FOUR ;;
	*5??) z=FIVE ;;
	*6??) z=SIX ;;
	*7??) z=SEVEN ;;
	*8??) z=EIGHT ;;
	*9??) z=NINE ;;
	*) z= ;;
      esac

      set $z ${z:+HUNDRED} $y $x $*
      ;;
  esac

  g=$(($g + 1))
  v=${v%%???}

done

p=S

case "$*" in
  "") set ZERO ;;
  ONE) p= ;;
esac

echo "$*!

$* NEW MAIL MESSAGE$p!

HAHAHAHAHA!"