From 366c683ff12d823f8c58bd3c706aa7873896863a Mon Sep 17 00:00:00 2001
From: Michael Hahsler <michael@hahsler.net>
Date: Fri, 19 Nov 2021 06:55:01 -0600
Subject: [PATCH] Fixed some C issues.

---
 DESCRIPTION  | 4 ++--
 NEWS.md      | 6 ++++++
 src/bitmat.c | 7 +++++--
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/DESCRIPTION b/DESCRIPTION
index ce5bdc2..4f4e071 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: arules
-Version: 1.7-0
-Date: 2021-11-12
+Version: 1.7-1
+Date: 2021-11-18
 Title: Mining Association Rules and Frequent Itemsets
 Authors@R: c(person("Michael", "Hahsler", role = c("aut", "cre", "cph"),
 		email = "mhahsler@lyle.smu.edu"),
diff --git a/NEWS.md b/NEWS.md
index fe2c19d..d9d310f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,9 @@
+# arules 1.7-1 (11/18/2021)
+
+## Bugfixes
+
+* Fixed some C issues: unsigned int in bitmat.c (function static int _exists) to ensure bit shifting works. The bitmap support buffer is now initialized with zeros. 
+
 # arules 1.7-0 (11/12/2021)
 
 ## New Feature
diff --git a/src/bitmat.c b/src/bitmat.c
index eafe2a5..26c32ec 100644
--- a/src/bitmat.c
+++ b/src/bitmat.c
@@ -326,7 +326,8 @@ int bm_count (BITMAT *bm, int row)
 static int _exists (BITMAT *bm, int *ids, int n, int supp)
 {                               /* -- check maximal/closed item sets */
   int i, k, x, m = n;           /* loop variables */
-  int b, bb;                    /* support bit mask */
+  // MFH: int b, bb;                    /* support bit mask */
+  unsigned int b, bb;                    /* support bit mask */
   int *d, *s;                   /* to traverse the bit vectors */
   int r = 0;                    /* result of intersection */
 
@@ -477,7 +478,9 @@ static int _buffers (BITMAT *bm, int mode)
   bm->buf = (int*)malloc((BLKSIZE+1) *sizeof(int)) +1;
   if (!bm->buf)   { bm_delete(bm); return -1; }
   if (mode != BM_CLOSED) return 0;
-  bm->supps = (int*)malloc((BLKSIZE << BM_SHIFT) *sizeof(int));
+  // MFH: Initialize with 0
+  //bm->supps = (int*)malloc((BLKSIZE << BM_SHIFT) *sizeof(int));
+  bm->supps = (int*)calloc((BLKSIZE << BM_SHIFT), sizeof(int));
   if (!bm->supps) { bm_delete(bm); return -1; }
   return 0;                     /* allocate additional buffers */
 }  /* _buffers() */