src/misc/mvc/mvcSort.c

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#include "mvc.h"



Mvc_Cube_t * Mvc_CoverSort_rec( Mvc_Cube_t * pList, int nItems, Mvc_Cube_t * pMask, int (* pCompareFunc)(Mvc_Cube_t *, Mvc_Cube_t *, Mvc_Cube_t *) );
Mvc_Cube_t * Mvc_CoverSortMerge( Mvc_Cube_t * pList1, Mvc_Cube_t * pList2, Mvc_Cube_t * pMask, int (* pCompareFunc)(Mvc_Cube_t *, Mvc_Cube_t *, Mvc_Cube_t *) );


void Mvc_CoverSort( Mvc_Cover_t * pCover, Mvc_Cube_t * pMask, int (* pCompareFunc)(Mvc_Cube_t *, Mvc_Cube_t *, Mvc_Cube_t *) )
{
    Mvc_Cube_t * pHead;
    int nCubes;
    // one cube does not need sorting
    nCubes = Mvc_CoverReadCubeNum(pCover);
    if ( nCubes <= 1 )
        return;
    // sort the cubes 
    pHead = Mvc_CoverSort_rec( Mvc_CoverReadCubeHead(pCover), nCubes, pMask, pCompareFunc ); 
    // insert the sorted list into the cover
    Mvc_CoverSetCubeHead( pCover, pHead );
    Mvc_CoverSetCubeTail( pCover, Mvc_ListGetTailFromHead(pHead) );
    // make sure that the list is sorted in the increasing order
    assert( pCompareFunc( Mvc_CoverReadCubeHead(pCover), Mvc_CoverReadCubeTail(pCover), pMask ) <= 0 );
}

Mvc_Cube_t * Mvc_CoverSort_rec( Mvc_Cube_t * pList, int nItems, Mvc_Cube_t * pMask, int (* pCompareFunc)(Mvc_Cube_t *, Mvc_Cube_t *, Mvc_Cube_t *) )
{
    Mvc_Cube_t * pList1, * pList2;
    int nItems1, nItems2, i;

    // trivial case
    if ( nItems == 1 )
    {
        Mvc_CubeSetNext( pList, NULL );
        return pList;
    }

    // select the new sizes
    nItems1 = nItems/2;
    nItems2 = nItems - nItems1;

    // set the new beginnings
    pList1 = pList2 = pList;
    for ( i = 0; i < nItems1; i++ )
        pList2 = Mvc_CubeReadNext( pList2 );

    // solve recursively
    pList1 = Mvc_CoverSort_rec( pList1, nItems1, pMask, pCompareFunc );
    pList2 = Mvc_CoverSort_rec( pList2, nItems2, pMask, pCompareFunc );

    // merge
    return Mvc_CoverSortMerge( pList1, pList2, pMask, pCompareFunc );
}


Mvc_Cube_t * Mvc_CoverSortMerge( Mvc_Cube_t * pList1, Mvc_Cube_t * pList2, Mvc_Cube_t * pMask, int (* pCompareFunc)(Mvc_Cube_t *, Mvc_Cube_t *, Mvc_Cube_t *) )
{
    Mvc_Cube_t * pList = NULL, ** ppTail = &pList;
    Mvc_Cube_t * pCube;
    while ( pList1 && pList2 )
    {
        if ( pCompareFunc( pList1, pList2, pMask ) < 0 )
        {
            pCube = pList1;
            pList1 = Mvc_CubeReadNext(pList1);
        }
        else
        {
            pCube = pList2;
            pList2 = Mvc_CubeReadNext(pList2);
        }
        *ppTail = pCube;
        ppTail = Mvc_CubeReadNextP(pCube);
    }
    *ppTail = pList1? pList1: pList2;
    return pList;
}

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