#! /bin/sh

# Make a tags file for #defines.

info() {
	cat <<-END
	Use: `basename $0` [-m] [-_] file...

	Purpose: create a tags file for #defines.

	Options:
	-m	merge into existing tags file (default is to replace it).
	-_	For all routines "xxx_", make a duplicate entry "xxx".
	END

}

case $# in
0 ) info ; exit ;;
esac

merge=no
strip=no
for opt in "$@"
do
    case "$opt" in
    -m ) merge=yes ; shift ;;
    -h ) info ; exit 0 ;;
    -_ ) strip=yes ; shift ;;
    -* ) echo "`basename $0`: Invalid option $opt" ; exit 1 ;;
    * ) break ;;
    esac
done

if [ $merge = no -a -f tags ] ; then rm tags ; fi

for file in "$@"
do
    sed -n -e \
    '/^#define[ 	]*\([a-zA-Z_0-9]\)/ {s?.*?/^&$/?;h;s/.*define[     ]*\([a-zA-Z_0-9][a-zA-Z_0-9]*\).*/\1/;G;s/\n/	@@@@@	/;p
}' $file | sed "s
@@@@@
$file
" >> tags
done

f=/usr/tmp/tags.$$
sort tags > $f
case $strip in
yes )
    sed -n -e \
    'h;/^[a-zA-Z_0-9][a-zA-Z_0-9]*_[	]/s/\([a-zA-Z_0-9][a-zA-Z_0-9]*\)_[	]/\1	/p;g;p' $f >\
    tags
    ;;
* )
    cp $f tags
    ;;
esac
rm $f