diff options
Diffstat (limited to 'dc/dc-regdef.h')
| -rw-r--r-- | dc/dc-regdef.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/dc/dc-regdef.h b/dc/dc-regdef.h new file mode 100644 index 0000000..540268c --- /dev/null +++ b/dc/dc-regdef.h @@ -0,0 +1,43 @@ +/* + * definitions for dc's "register" declarations + * + * Copyright (C) 1994 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, you can either send email to this + * program's author (see below) or write to: + * + * The Free Software Foundation, Inc. + * 59 Temple Place, Suite 330 + * Boston, MA 02111 USA + */ + +#ifdef HAVE_LIMITS_H +# include <limits.h> /* UCHAR_MAX */ +#endif + +/* determine how many register stacks there are */ +#ifndef DC_REGCOUNT +# ifndef UCHAR_MAX +# define DC_REGCOUNT 256 +# else +# define DC_REGCOUNT (UCHAR_MAX+1) +# endif +#endif /* not DC_REGCOUNT */ + +/* efficiency hack for masking arbritrary integers to 0..(DC_REGCOUNT-1) */ +#if (DC_REGCOUNT & (DC_REGCOUNT-1)) == 0 /* DC_REGCOUNT is power of 2 */ +# define regmap(r) ((r) & (DC_REGCOUNT-1)) +#else +# define regmap(r) ((r) % DC_REGCOUNT) +#endif |