/*
 * Revision Control Information
 *
 * $Source$
 * $Author$
 * $Revision$
 * $Date$
 *
 */
//#include "port.h"
#include "sparse_int.h"

ABC_NAMESPACE_IMPL_START


/*
 *  free-lists are only used if 'FAST_AND_LOOSE' is set; this is because
 *  we lose the debugging capability of libmm_t which trashes objects when
 *  they are free'd.  However, FAST_AND_LOOSE is much faster if matrices
 *  are created and freed frequently.
 */

#ifdef FAST_AND_LOOSE
sm_element *sm_element_freelist;
sm_row *sm_row_freelist;
sm_col *sm_col_freelist;
#endif


sm_matrix *
sm_alloc()
{
    register sm_matrix *A;

    A = ALLOC(sm_matrix, 1);
    A->rows = NIL(sm_row *);
    A->cols = NIL(sm_col *);
    A->nrows = A->ncols = 0;
    A->rows_size = A->cols_size = 0;
    A->first_row = A->last_row = NIL(sm_row);
    A->first_col = A->last_col = NIL(sm_col);
    A->user_word = NIL(char);        /* for our user ... */
    return A;
}


sm_matrix *
sm_alloc_size(row, col)
int row, col;
{
    register sm_matrix *A;

    A = sm_alloc();
    sm_resize(A, row, col);
    return A;
}


void
sm_free(A)
sm_matrix *A;
{
#ifdef FAST_AND_LOOSE
    register sm_row *prow;

    if (A->first_row != 0) {
    for(prow = A->first_row; prow != 0; prow = prow->next_row) {
        /* add the elements to the free list of elements */
        prow->last_col->next_col = sm_element_freelist;
        sm_element_freelist = prow->first_col;
    }

    /* Add the linked list of rows to the row-free-list */
    A->last_row->next_row = sm_row_freelist;
    sm_row_freelist = A->first_row;

    /* Add the linked list of cols to the col-free-list */
    A->last_col->next_col = sm_col_freelist;
    sm_col_freelist = A->first_col;
    }
#else
    register sm_row *prow, *pnext_row;
    register sm_col *pcol, *pnext_col;

    for(prow = A->first_row; prow != 0; prow = pnext_row) {
    pnext_row = prow->next_row;
    sm_row_free(prow);
    }
    for(pcol = A->first_col; pcol != 0; pcol = pnext_col) {
    pnext_col = pcol->next_col;
    pcol->first_row = pcol->last_row = NIL(sm_element);
    sm_col_free(pcol);
    }
#endif

    /* Free the arrays to map row/col numbers into pointers */
    FREE(A->rows);
    FREE(A->cols);
    FREE(A);
}


sm_matrix *
sm_dup(A)
sm_matrix *A; 
{
    register sm_row *prow;
    register sm_element *p;
    register sm_matrix *B;

    B = sm_alloc();
    if (A->last_row != 0) {
    sm_resize(B, A->last_row->row_num, A->last_col->col_num);
    for(prow = A->first_row; prow != 0; prow = prow->next_row) {
        for(p = prow->first_col; p != 0; p = p->next_col) {
        (void) sm_insert(B, p->row_num, p->col_num);
        }
    }
    }
    return B;
}


void 
sm_resize(A, row, col)
register sm_matrix *A;
int row, col;
{
    register int i, new_size;

    if (row >= A->rows_size) {
    new_size = MAX(A->rows_size*2, row+1);
    A->rows = REALLOC(sm_row *, A->rows, new_size);
    for(i = A->rows_size; i < new_size; i++) {
        A->rows[i] = NIL(sm_row);
    }
    A->rows_size = new_size;
    }

    if (col >= A->cols_size) {
    new_size = MAX(A->cols_size*2, col+1);
    A->cols = REALLOC(sm_col *, A->cols, new_size);
    for(i = A->cols_size; i < new_size; i++) {
        A->cols[i] = NIL(sm_col);
    }
    A->cols_size = new_size;
    }
}


/*  
 *  insert -- insert a value into the matrix
 */
sm_element *
sm_insert(A, row, col)
register sm_matrix *A;
register int row, col;
{
    register sm_row *prow;
    register sm_col *pcol;
    register sm_element *element;
    sm_element *save_element;

    if (row >= A->rows_size || col >= A->cols_size) {
    sm_resize(A, row, col);
    }

    prow = A->rows[row];
    if (prow == NIL(sm_row)) {
    prow = A->rows[row] = sm_row_alloc();
    prow->row_num = row;
    sorted_insert(sm_row, A->first_row, A->last_row, A->nrows, 
            next_row, prev_row, row_num, row, prow);
    }

    pcol = A->cols[col];
    if (pcol == NIL(sm_col)) {
    pcol = A->cols[col] = sm_col_alloc();
    pcol->col_num = col;
    sorted_insert(sm_col, A->first_col, A->last_col, A->ncols, 
            next_col, prev_col, col_num, col, pcol);
    }

    /* get a new item, save its address */
    sm_element_alloc(element);
    save_element = element;

    /* insert it into the row list */
    sorted_insert(sm_element, prow->first_col, prow->last_col, 
        prow->length, next_col, prev_col, col_num, col, element);

    /* if it was used, also insert it into the column list */
    if (element == save_element) {
    sorted_insert(sm_element, pcol->first_row, pcol->last_row, 
        pcol->length, next_row, prev_row, row_num, row, element);
    } else {
    /* otherwise, it was already in matrix -- free element we allocated */
    sm_element_free(save_element);
    }
    return element;
}


sm_element *
sm_find(A, rownum, colnum)
sm_matrix *A;
int rownum, colnum;
{
    sm_row *prow;
    sm_col *pcol;

    prow = sm_get_row(A, rownum);
    if (prow == NIL(sm_row)) {
    return NIL(sm_element);
    } else {
    pcol = sm_get_col(A, colnum);