NAME

       ID List Management -

   Data Structures
       struct MDB_ID2

   Macros
       #define MDB_IDL_LOGN   16     /* DB_SIZE is 2^16, UM_SIZE is 2^17 */
       #define MDB_IDL_DB_SIZE   (1<<MDB_IDL_LOGN)
       #define MDB_IDL_UM_SIZE   (1<<(MDB_IDL_LOGN+1))
       #define MDB_IDL_DB_MAX   (MDB_IDL_DB_SIZE-1)
       #define MDB_IDL_UM_MAX   (MDB_IDL_UM_SIZE-1)
       #define MDB_IDL_SIZEOF(ids)   (((ids)[0]+1) * sizeof(MDB_ID))
       #define MDB_IDL_IS_ZERO(ids)   ( (ids)[0] == 0 )
       #define MDB_IDL_CPY(dst, src)   (memcpy( dst, src, MDB_IDL_SIZEOF( src ) ))
       #define MDB_IDL_FIRST(ids)   ( (ids)[1] )
       #define MDB_IDL_LAST(ids)   ( (ids)[(ids)[0]] )
       #define mdb_midl_xappend(idl, id)
       #define CMP(x, y)   ( (x) < (y) ? -1 : (x) > (y) )
       #define SMALL   8
       #define MIDL_SWAP(a, b)   { itmp=(a); (a)=(b); (b)=itmp; }

   Typedefs
       typedef size_t MDB_ID
       typedef MDB_ID * MDB_IDL
       typedef MDB_ID2 * MDB_ID2L

   Functions
       unsigned mdb_midl_search (MDB_IDL ids, MDB_ID id)
       MDB_IDL mdb_midl_alloc (int num)
       void mdb_midl_free (MDB_IDL ids)
       int mdb_midl_shrink (MDB_IDL *idp)
       int mdb_midl_need (MDB_IDL *idp, unsigned num)
       int mdb_midl_append (MDB_IDL *idp, MDB_ID id)
       int mdb_midl_append_list (MDB_IDL *idp, MDB_IDL app)
       int mdb_midl_append_range (MDB_IDL *idp, MDB_ID id, unsigned n)
       void mdb_midl_sort (MDB_IDL ids)
       unsigned mdb_mid2l_search (MDB_ID2L ids, MDB_ID id)
       int mdb_mid2l_insert (MDB_ID2L ids, MDB_ID2 *id)
       int mdb_mid2l_append (MDB_ID2L ids, MDB_ID2 *id)
       static int mdb_midl_grow (MDB_IDL *idp, int num)

Detailed Description

Data Structure Documentation

struct MDB_ID2

       An ID2 is an ID/pointer pair.

   Data Fields

       MDB_ID mid
       void * mptr

Field Documentation

   MDB_ID MDB_ID2::mid
       The ID

   void* MDB_ID2::mptr
       The pointer

Macro Definition Documentation

   #define mdb_midl_xappend(idl, id)
       Value:

       do { \
                 MDB_ID *xidl = (idl), xlen = ++(xidl[0]);         xidl[xlen] = (id);     } while (0)
       Append ID to IDL. The IDL must be big enough.

Typedef Documentation

   typedef size_t MDB_ID
       A generic unsigned ID number. These were entryIDs in back-bdb. Preferably it should have
       the same size as a pointer.

   typedef MDB_ID* MDB_IDL
       An IDL is an ID List, a sorted array of IDs. The first element of the array is a counter
       for how many actual IDs are in the list. In the original back-bdb code, IDLs are sorted in
       ascending order. For libmdb IDLs are sorted in descending order.

   typedef MDB_ID2* MDB_ID2L
       An ID2L is an ID2 List, a sorted array of ID2s. The first element's mid member is a count
       of how many actual elements are in the array. The mptr member of the first element is
       unused. The array is sorted in ascending order by mid.

Function Documentation

   unsigned mdb_midl_search (MDB_IDLids, MDB_IDid)
       Search for an ID in an IDL.

       Parameters:
           ids The IDL to search.
           id The ID to search for.

       Returns:
           The index of the first ID greater than or equal to id.

   MDB_IDL mdb_midl_alloc (intnum)
       Allocate an IDL. Allocates memory for an IDL of the given size.

       Returns:
           IDL on success, NULL on failure.

   void mdb_midl_free (MDB_IDLids)
       Free an IDL.

       Parameters:
           ids The IDL to free.

   int mdb_midl_shrink (MDB_IDL *idp)
       Shrink an IDL. Return the IDL to the default size if it has grown larger.

       Parameters:
           idp Address of the IDL to shrink.

       Returns:
           0 on no change, non-zero if shrunk.

   int mdb_midl_need (MDB_IDL *idp, unsignednum)
       Make room for num additional elements in an IDL.

       Parameters:
           idp Address of the IDL.
           num Number of elements to make room for.

       Returns:
           0 on success, ENOMEM on failure.

   int mdb_midl_append (MDB_IDL *idp, MDB_IDid)
       Append an ID onto an IDL.

       Parameters:
           idp Address of the IDL to append to.
           id The ID to append.

       Returns:
           0 on success, ENOMEM if the IDL is too large.

   int mdb_midl_append_list (MDB_IDL *idp, MDB_IDLapp)
       Append an IDL onto an IDL.

       Parameters:
           idp Address of the IDL to append to.
           app The IDL to append.

       Returns:
           0 on success, ENOMEM if the IDL is too large.

   int mdb_midl_append_range (MDB_IDL *idp, MDB_IDid, unsignedn)
       Append an ID range onto an IDL.

       Parameters:
           idp Address of the IDL to append to.
           id The lowest ID to append.
           n Number of IDs to append.

       Returns:
           0 on success, ENOMEM if the IDL is too large.

   void mdb_midl_sort (MDB_IDLids)
       Sort an IDL.

       Parameters:
           ids The IDL to sort.

   unsigned mdb_mid2l_search (MDB_ID2Lids, MDB_IDid)
       Search for an ID in an ID2L.

       Parameters:
           ids The ID2L to search.
           id The ID to search for.

       Returns:
           The index of the first ID2 whose mid member is greater than or equal to id.

   int mdb_mid2l_insert (MDB_ID2Lids, MDB_ID2 *id)
       Insert an ID2 into a ID2L.

       Parameters:
           ids The ID2L to insert into.
           id The ID2 to insert.

       Returns:
           0 on success, -1 if the ID was already present in the ID2L.

   int mdb_mid2l_append (MDB_ID2Lids, MDB_ID2 *id)
       Append an ID2 into a ID2L.

       Parameters:
           ids The ID2L to append into.
           id The ID2 to append.

       Returns:
           0 on success, -2 if the ID2L is too big.

Author

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