Signal a pgen abort if the jump and base share a common factor.

[u/mdw/catacomb] / pgen.c

diff --git a/pgen.c b/pgen.c
index 5b9fd9e..0e67c76 100644 (file)
--- a/pgen.c
+++ b/pgen.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: pgen.c,v 1.4 1999/12/22 16:01:11 mdw Exp $
+ * $Id: pgen.c,v 1.5 2000/06/17 11:52:36 mdw Exp $
  *
  * Prime generation glue
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: pgen.c,v $
+ * Revision 1.5  2000/06/17 11:52:36  mdw
+ * Signal a pgen abort if the jump and base share a common factor.
+ *
  * Revision 1.4  1999/12/22 16:01:11  mdw
  * Same file, completely different code.  Main interface for new prime-
  * search system.
@@ -95,10 +98,17 @@ int pgen_jump(int rq, pgen_event *ev, void *p)
   int rc = PGEN_ABORT;
 
   switch (rq) {
-    case PGEN_BEGIN:
+    case PGEN_BEGIN: {
+      mp *g = MP_NEW;
+      mp_gcd(&g, 0, 0, ev->m, f->j->m);
+      if (MP_CMP(g, >, MP_ONE)) {
+       mp_drop(g);
+       return (PGEN_ABORT);
+      }
+      mp_drop(g);
       rc = pfilt_create(&f->f, ev->m);
       mp_drop(ev->m);
-      break;
+    } break;
     case PGEN_TRY:
       mp_drop(ev->m);
       rc = pfilt_jump(&f->f, f->j);