#! /bin/sh
# tear prefix [file...] - tear RFC822 header and body apart
#	output files are $1hdr and $1body
PATH=/bin:/usr/bin; export PATH

case $# in
0)
	echo "usage: tear prefix [file...]" >&2
	exit 1
	;;
esac

hdr="$1hdr"
body="$1body"
shift

>>$hdr					# create files just in case
>>$body
case $# in
0)	args="-" ;;	# awk needs a filename due to cmd. line assignments
*)	args="$@" ;;
esac
# thanks to Charles Lindsey for the slightly better checking here
exec awk 'BEGIN {
	inbody = 0
	status = 0
	hdr = "'"$hdr"'"
	body = "'"$body"'"
}
/^$/ { inbody = 1 }
inbody == 0 && ($0 ~ /^[^ \t]*:/ || ($0 ~ /^[ \t]/ && NR > 1)) {
	print >hdr
	next
}
inbody == 0 {
	print "tear: invalid header \"" $0 "\"" | "cat >&2"
	status = 1
}
inbody == 1 {
	print >body
}
END { exit status }' $args