GNU bc 1.05a

1 files changed, 40 insertions, 0 deletions

diff --git a/gnu/usr.bin/bc/dc/dc-regdef.h b/gnu/usr.bin/bc/dc/dc-regdef.h
new file mode 100644
index 00000000000..129d0ae6596
--- /dev/null
+++ b/gnu/usr.bin/bc/dc/dc-regdef.h
@@ -0,0 +1,40 @@
+/* 
+ * 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.; 675 Mass Ave. Cambridge, MA 02139, 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