X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/71ec78ce88339bda7c265d6dafa4982077acc901..d3409d5ecf2492cff862616de72a580d1a8e8dc0:/mp-misc.c

diff --git a/mp-misc.c b/mp-misc.c
new file mode 100644
index 0000000..7f5513f
--- /dev/null
+++ b/mp-misc.c
@@ -0,0 +1,109 @@
+/* -*-c-*-
+ *
+ * $Id: mp-misc.c,v 1.1 1999/11/17 18:02:16 mdw Exp $
+ *
+ * Miscellaneous multiprecision support functions
+ *
+ * (c) 1999 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------* 
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ * 
+ * Catacomb 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 Library General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Revision history --------------------------------------------------* 
+ *
+ * $Log: mp-misc.c,v $
+ * Revision 1.1  1999/11/17 18:02:16  mdw
+ * New multiprecision integer arithmetic suite.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include "mp.h"
+
+/*----- Paranoia management -----------------------------------------------*/
+
+/* --- @mp_burn@ --- *
+ *
+ * Arguments:	@mp *m@ = pointer to a multiprecision integer
+ *
+ * Returns:	---
+ *
+ * Use:		Marks the integer as `burn-after-use'.  When the integer's
+ *		memory is deallocated, it is deleted so that traces can't
+ *		remain in the swap file.  In theory.
+ */
+
+void mp_burn(mp *m)
+{
+  m->f |= MP_BURN;
+}
+
+/*----- Basic manipulation ------------------------------------------------*/
+
+/* --- @mp_shrink@ --- *
+ *
+ * Arguments:	@mp *m@ = pointer to a multiprecision integer
+ *
+ * Returns:	---
+ *
+ * Use:		Reduces the recorded length of an integer.  This doesn't
+ *		reduce the amount of memory used, although it can improve
+ *		performance a bit.  To reduce memory, use @mp_minimize@
+ *		instead.  This can't change the value of an integer, and is
+ *		therefore safe to use even when there are multiple
+ *		references.
+ */
+
+void mp_shrink(mp *m) { MP_SHRINK(m); }
+
+/* --- @mp_minimize@ --- *
+ *
+ * Arguments:	@mp *m@ = pointer to a multiprecision integer
+ *
+ * Returns:	---
+ *
+ * Use:		Reduces the amount of memory an integer uses.  It's best to
+ *		do this to numbers which aren't going to change in the
+ *		future.
+ */
+
+void mp_minimize(mp *m)
+{
+  MP_SHRINK(m);
+  MP_RESIZE(m, MP_LEN(m));
+}
+
+/*----- Bit scanning ------------------------------------------------------*/
+
+/* --- @mp_scan@ --- *
+ *
+ * Arguments:	@mpscan *sc@ = pointer to bitscanner block
+ *		@const mp *m@ = pointer to a multiprecision integer
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes a bitscanner on a multiprecision integer.
+ */
+
+void mp_scan(mpscan *sc, const mp *m) { MP_SCAN(sc, m); }
+
+/*----- That's all, folks -------------------------------------------------*/