From: Ralph Corderoy <ralph@inputplus.co.uk>
Date: Fri, 28 Apr 2017 11:12:15 +0000 (+0100)
Subject: sbr/vector.c: Use new BVEC_BITS_BITS macro.
X-Git-Url: https://diplodocus.org/git/nmh/commitdiff_plain/b5a92b55eb5670e982899e5dfd9aaa1d35db002f?ds=inline;hp=c8caafcb4a39516eaec330f9ea229ea52e5fe46b

sbr/vector.c: Use new BVEC_BITS_BITS macro.

Factors out a common expression from a few other places.
---

diff --git a/sbr/vector.c b/sbr/vector.c
index 3bf4c1f0..c2bd0df9 100644
--- a/sbr/vector.c
+++ b/sbr/vector.c
@@ -32,8 +32,10 @@
 
 /* The *sizeof* struct bvector's bits member.  Not its size in bits. */
 #define BVEC_SIZEOF_BITS (sizeof *(((bvector_t)NULL)->bits))
-#define BVEC_WORD(max) ((max) / (BVEC_SIZEOF_BITS * CHAR_BIT))
-#define BVEC_OFFSET(max) ((max) % (BVEC_SIZEOF_BITS * CHAR_BIT))
+/* The number of bits held in one element of the bits member. */
+#define BVEC_BITS_BITS (BVEC_SIZEOF_BITS * CHAR_BIT)
+#define BVEC_WORD(max) ((max) / BVEC_BITS_BITS)
+#define BVEC_OFFSET(max) ((max) % BVEC_BITS_BITS)
 #define BVEC_BYTES(n) \
     ((BVEC_WORD(n) + (BVEC_OFFSET(n) == 0 ? 0 : 1)) * BVEC_SIZEOF_BITS)
 
@@ -139,8 +141,8 @@ bvector_resize (bvector_t vec, size_t maxsize) {
     } else
         vec->bits = mh_xrealloc(vec->bits, bytes);
 
-    memset(vec->bits + (old_maxsize / (BVEC_SIZEOF_BITS * CHAR_BIT)),
-        0, (vec->maxsize - old_maxsize) / CHAR_BIT);
+    memset(vec->bits + (old_maxsize / BVEC_BITS_BITS), 0,
+        (vec->maxsize - old_maxsize) / CHAR_BIT);
 }
 
 unsigned long