?RCS: $Id: fieldn.U 167 2013-05-08 17:58:00Z rmanfredi $
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
?RCS: 
?RCS: You may redistribute only under the terms of the Artistic License,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic License; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?RCS: $Log: Findhdr.U,v $
?RCS: Revision 3.0.1.2  1994/10/29  15:53:08  ram
?RCS: patch36: added ?F: line for metalint file checking
?RCS:
?RCS: Revision 3.0.1.1  1994/05/06  14:03:56  ram
?RCS: patch23: cppminus must be after other cppflags, not before
?RCS:
?RCS: Revision 3.0  1993/08/18  12:04:54  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:fieldn cppfilter: grep test tr rm cat startsh \
	cppstdin cppminus osname
?MAKE:	-pick add $@ %<
?S:fieldn:
?S:	This variable is used internally by Configure. It contains the position
?S:	of the included file name in cpp output. That is to say, when cpp
?S:	pre-processes a #include <file> line, it replaces it by a # line which
?S:	contains the original position in the input file and the full name of
?S:	included file, between "quotes".
?S:.
?S:cppfilter:
?S: This variable is used internally by Configure.  It either contains
?S:	nothing or a shell piping stage to translate path components into "/".
?S:	It is meant to be used as "... | $cppfilter $grep ..." i.e. without any
?S:	explicit "|" character following it.
?S:.
?F:!fieldn
?T:pos testaccess cline
: determine filename position in cpp output
echo " "
echo "Computing filename position in cpp output for #include directives..." >&4
echo '#include <stdio.h>' > foo.c
case "$osname" in
vos)
	testaccess=-e
?X: VOS: path component separator is >
	cppfilter="tr '\\\\>' '/' |"
	;;
*)
	testaccess=-r
	cppfilter=''
	;;
esac
$cat >fieldn <<EOF
$startsh
$cppstdin $cppminus <foo.c 2>/dev/null | \
$grep '^[ 	]*#.*stdio\.h' | \
while read cline; do
	pos=1
	set \$cline
	while $test \$# -gt 0; do
		if $test $testaccess \`echo \$1 | $tr -d '"'\`; then
			echo "\$pos"
			exit 0
		fi
		shift
		pos=\`expr \$pos + 1\`
	done
done
EOF
chmod +x fieldn
fieldn=`./fieldn`
$rm -f foo.c fieldn
case $fieldn in
'') pos='???';;
1) pos=first;;
2) pos=second;;
3) pos=third;;
*) pos="${fieldn}th";;
esac
echo "Your cpp writes the filename in the $pos field of the line."