[RFC PATCH 03/10] ewah/bitmap: introduce bitmap_word_alloc()

[Christian Couder <christian.couder@gmail.com>]

From: Jeff King <peff@peff.net>

In a following patch we will need to allocate a variable
number of bitmap words, instead of always 32, so let's add
bitmap_word_alloc() for this purpose.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 ewah/bitmap.c | 11 ++++++++---
 ewah/ewok.h   |  1 +
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/ewah/bitmap.c b/ewah/bitmap.c
index 52f1178db4..143dc71419 100644
--- a/ewah/bitmap.c
+++ b/ewah/bitmap.c
@@ -22,14 +22,19 @@
 #define EWAH_MASK(x) ((eword_t)1 << (x % BITS_IN_EWORD))
 #define EWAH_BLOCK(x) (x / BITS_IN_EWORD)
 
-struct bitmap *bitmap_new(void)
+struct bitmap *bitmap_word_alloc(size_t word_alloc)
 {
 	struct bitmap *bitmap = xmalloc(sizeof(struct bitmap));
-	bitmap->words = xcalloc(32, sizeof(eword_t));
-	bitmap->word_alloc = 32;
+	bitmap->words = xcalloc(word_alloc, sizeof(eword_t));
+	bitmap->word_alloc = word_alloc;
 	return bitmap;
 }
 
+struct bitmap *bitmap_new(void)
+{
+	return bitmap_word_alloc(32);
+}
+
 void bitmap_set(struct bitmap *self, size_t pos)
 {
 	size_t block = EWAH_BLOCK(pos);
diff --git a/ewah/ewok.h b/ewah/ewok.h
index 84b2a29faa..1b98b57c8b 100644
--- a/ewah/ewok.h
+++ b/ewah/ewok.h
@@ -172,6 +172,7 @@ struct bitmap {
 };
 
 struct bitmap *bitmap_new(void);
+struct bitmap *bitmap_word_alloc(size_t word_alloc);
 void bitmap_set(struct bitmap *self, size_t pos);
 int bitmap_get(struct bitmap *self, size_t pos);
 void bitmap_reset(struct bitmap *self);
-- 
2.23.0.46.gd213b4aca1.dirty