source: trunk-3.0/source/lib/bitmap.c@ 101

/*
   Unix SMB/CIFS implementation.
   simple bitmap functions
   Copyright (C) Andrew Tridgell 1992-1998

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

/* these functions provide a simple way to allocate integers from a
   pool without repetition */

/****************************************************************************
allocate a bitmap of the specified size
****************************************************************************/
struct bitmap *bitmap_allocate(int n)
{
        struct bitmap *bm;

        bm = SMB_MALLOC_P(struct bitmap);

        if (!bm) return NULL;
        
        bm->n = n;
        bm->b = SMB_MALLOC_ARRAY(uint32, (n+31)/32);
        if (!bm->b) {
                SAFE_FREE(bm);
                return NULL;
        }

        memset(bm->b, 0, sizeof(uint32)*((n+31)/32));

        return bm;
}

/****************************************************************************
free a bitmap.
****************************************************************************/

void bitmap_free(struct bitmap *bm)
{
        if (!bm)
                return;

        SAFE_FREE(bm->b);
        SAFE_FREE(bm);
}

/****************************************************************************
talloc a bitmap