Add bitfs_reset()

src/bitf_segmentation.h

@@ -42,6 +42,7 @@ struct bitfs {
 #define BITFS_MAGIC	0xc18b98bd
 	uint16_t	nbitfss;	// length of flexarray (used)
 	uint16_t	lbitfss;	// space for flexarray
+	size_t		space;		// for reset
 	size_t		nbits;
 	size_t		nset;		// count of set bits
 	struct bitfss	s[];
@@ -59,6 +60,7 @@ bitfs_init(void *p, size_t space)
 	memset(p, 0, space);
 	bitfs = p;
 	bitfs->magic = BITFS_MAGIC;
+	bitfs->space = space;
 
 	space -= sizeof *bitfs;
 	space /= sizeof *bitfs->s;
@@ -71,6 +73,15 @@ bitfs_init(void *p, size_t space)
 	return (bitfs);
 }
 
+static inline void
+bitfs_reset(struct bitfs *bitfs)
+{
+
+	CHECK_OBJ_NOTNULL(bitfs, BITFS_MAGIC);
+	AN(bitfs->space);
+	bitfs_init(bitfs, bitfs->space);
+}
+
 static inline void
 bitfs_add(struct bitfs *bitfs, struct bitf *bitf)
 {