X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/518452dea7d3ef127aa6ea3bb7971154994e6977..1d6d3b01cb40e0cfaeb816c87c513695aea0816a:/primeiter.h?ds=sidebyside

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+/* -*-c-*-
+ *
+ * Iterate over small primes efficiently
+ *
+ * (c) 2007 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.
+ */
+
+#ifndef CATACOMB_PRIMEITER_H
+#define CATACOMB_PRIMEITER_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#ifndef CATACOMB_GRAND_H
+#  include "grand.h"
+#endif
+
+#ifndef CATACOMB_MP_H
+#  include "mp.h"
+#endif
+
+/*----- Data structures ---------------------------------------------------*/
+
+typedef struct primeiter {
+  mpw w;
+  mp pp;
+  mp *p;
+  grand *r;
+  unsigned mode;
+  int i;
+} primeiter;
+
+enum {
+  PIMODE_PTAB,
+  PIMODE_STALL,
+  PIMODE_WHEEL
+};
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @primeiter_create@ --- *
+ *
+ * Arguments:	@primeiter *pi@ = pointer to an iterator structure
+ *		@mp *start@ = where to start
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes a prime iterator.  The first output will be the
+ *		smallest prime not less than @start@.
+ */
+
+extern void primeiter_create(primeiter */*pi*/, mp */*start*/);
+
+/* --- @primeiter_destroy@ --- *
+ *
+ * Arguments:	@primeiter *pi@ = pointer to iterator structure
+ *
+ * Returns:	---
+ *
+ * Use:		Frees up an iterator structure when it's no longer wanted.
+ */
+
+void primeiter_destroy(primeiter */*pi*/);
+
+/* --- @primeiter_next@ --- *
+ *
+ * Arguments:	@primeiter *pi@ = pointer to an iterator structure
+ *		@mp *d@ = fake destination
+ *
+ * Returns:	The next prime number from the iterator.
+ *
+ * Use:		Returns a new prime number.
+ */
+
+mp *primeiter_next(primeiter */*pi*/, mp */*d*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif