Generalize the backing type of bitvec

include/ucore/bitvec.h

@@ -1,13 +1,18 @@
 #ifndef UC_BITEVEC_H_
 #define UC_BITEVEC_H_
 
+#include <limits.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+/** Backing type of the bit vector*/
+typedef unsigned long uc_bv_integer;
+
 struct UCBitVec {
     //storage for the bits
-    unsigned long *vec;
+    uc_bv_integer *vec;
     //length in bytes of the above vec.
     size_t vec_len;
 };
@@ -15,11 +20,11 @@ struct UCBitVec {
 /**
  *  Evaluates the length required for a bitvec to store nbit bits.
  */
-#define UC_BV_LEN(nbits)   ((nbits/(sizeof(unsigned long)*CHAR_BIT)) + (nbits % (sizeof(unsigned long)*CHAR_BIT) == 0 ? 0 : 1))
+#define UC_BV_LEN(nbits)   ((nbits/(sizeof(uc_bv_integer)*CHAR_BIT)) + (nbits % (sizeof(uc_bv_integer)*CHAR_BIT) == 0 ? 0 : 1))
 
 /**
  * Use as :
- * unsigned long v[10];
+ * uc_bv_integer v[10];
  * struct UCBitVec v = BITVEC_STATIC_INIT(v);
  */
 #define UC_BV_STATIC_INIT(vec_data)\