copy_string
extern char *copy_string PROTO ((const char *));
cpy = copy_string(defname);
outfilename = copy_string( nmstr );
{ extra_type = copy_string( nmstr ); }
{ prefix = copy_string( nmstr ); }
{ yyclass = copy_string( nmstr ); }
{ headerfilename = copy_string( nmstr ); }
{ tablesext = true; tablesfilename = copy_string( nmstr ); }
if (addsym (copy_string (name),
scname[lastsc] = copy_string (str);
th->th_version = copy_string (version_str);
th->th_name = copy_string (name);