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-rw-r--r--ipset.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/ipset.h b/ipset.h
index 50a3476..4ac2da9 100644
--- a/ipset.h
+++ b/ipset.h
@@ -184,4 +184,9 @@ extern void *ipset_malloc(size_t size);
extern char *ipset_strdup(const char *);
extern void ipset_free(void **data);
+#define BITSPERBYTE (8*sizeof(char))
+#define ID2BYTE(id) ((id)/BITSPERBYTE)
+#define ID2MASK(id) (1 << ((id)%BITSPERBYTE))
+#define test_bit(id, heap) ((((char *)(heap))[ID2BYTE(id)] & ID2MASK(id)) != 0)
+
#endif /* __IPSET_H */