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cbf_alloc.c

/**********************************************************************
 * cbf_alloc -- memory allocation                                     *
 *                                                                    *
 * Version 0.7.6 14 July 2006                                         *
 *                                                                    *
 *                          Paul Ellis and                            *
 *         Herbert J. Bernstein (yaya@bernstein-plus-sons.com)        *
 *                                                                    *
 * (C) Copyright 2006 Herbert J. Bernstein                            *
 *                                                                    *
 **********************************************************************/

/**********************************************************************
 *                                                                    *
 * YOU MAY REDISTRIBUTE THE CBFLIB PACKAGE UNDER THE TERMS OF THE GPL *
 *                                                                    *
 * ALTERNATIVELY YOU MAY REDISTRIBUTE THE CBFLIB API UNDER THE TERMS  *
 * OF THE LGPL                                                        *
 *                                                                    *
 **********************************************************************/

/*************************** GPL NOTICES ******************************
 *                                                                    *
 * 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     *
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 * GNU General Public License for more details.                       *
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 **********************************************************************/

/************************* LGPL NOTICES *******************************
 *                                                                    *
 * This library is free software; you can redistribute it and/or      *
 * modify it under the terms of the GNU Lesser General Public         *
 * License as published by the Free Software Foundation; either       *
 * version 2.1 of the License, or (at your option) any later version. *
 *                                                                    *
 * This library 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  *
 * Lesser General Public License for more details.                    *
 *                                                                    *
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 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,    *
 * MA  02110-1301  USA                                                *
 *                                                                    *
 **********************************************************************/

/**********************************************************************
 *                                                                    *
 *                    Stanford University Notices                     *
 *  for the CBFlib software package that incorporates SLAC software   *
 *                 on which copyright is disclaimed                   *
 *                                                                    *
 * This software                                                      *
 * -------------                                                      *
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 * University.                                                        *
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 * Acknowledgement of sponsorship                                     *
 * ------------------------------                                     *
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 * Based on SLAC Software Notices, Set 4                              *
 * OTT.002a, 2004 FEB 03                                              *
 **********************************************************************/



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#ifdef __cplusplus

extern "C" {

#endif

#include "cbf.h"
#include "cbf_alloc.h"

#include <stdlib.h>
#include <string.h>


#ifdef CBFLIB_MEM_DEBUG
size_t memory_allocated;
#endif


  /* Reallocate a block of memory (never lose the old block on failure) */

int cbf_realloc (void **old_block, size_t *old_nelem,
                 size_t elsize, size_t nelem)
{
  void *new_block;


    /* Are the arguments valid? */

  if (!old_block || elsize == 0)

    return CBF_ARGUMENT;


    /* Is the size alread correct? */

  if (old_nelem)

    if (*old_nelem == nelem)

      return 0;


    /* Allocate the memory */

  if (nelem > 0)
  {
  
#ifdef CBFLIB_MEM_DEBUG

    char * cnew_block;

#endif
    
    new_block = malloc (nelem * elsize + sizeof(size_t));

    if (!new_block)

      return CBF_ALLOC;
    
    *(size_t *)new_block = nelem * elsize;

#ifdef CBFLIB_MEM_DEBUG

    fprintf(stderr, "allocated %ld size %ld\n",(long)new_block,(long)(nelem * elsize));
    
    cnew_block = (char *)new_block;
      
    cnew_block += sizeof(size_t);
    
    new_block = (void *)cnew_block;
    
    memory_allocated += nelem * elsize;
    
#endif

  }
  else

    new_block = NULL;


    /* Copy the old data */

  if (old_nelem)

    if (*old_block && *old_nelem > 0 && nelem > 0)
    {
      if (*old_nelem > nelem)

        *old_nelem = nelem;

      memcpy (new_block, *old_block, *old_nelem * elsize);
    }


    /* Free the old memory */

  if (*old_block)  {
  
#ifdef CBFLIB_MEM_DEBUG
  
    char * cold_block;
    
    cold_block = (void *)(*old_block);
  
    (cold_block) -= sizeof(size_t);
    
    *old_block = (char *)cold_block;
  
    memory_allocated -= *(size_t *)(*old_block); 
    
    fprintf(stderr, "freeing %ld size %ld\n",(long)(*old_block),(long)(*(size_t *)(*old_block)));

#endif

    free (*old_block);

  }


    /* Clear the new data */

  if (!old_nelem)

    memset (new_block, 0, nelem * elsize);

  else

    if (nelem > 0 && nelem > *old_nelem)

      memset (((char *) new_block) + *old_nelem * elsize, 0,
                                     (nelem - *old_nelem) * elsize);


    /* Replace the old data */

  *old_block = new_block;

  if (old_nelem)

    *old_nelem = nelem;


    /* Success */

  return 0;
}


  /* Allocate a block of memory */

int cbf_alloc (void **new_block, size_t *new_nelem,
               size_t elsize, size_t nelem)
{
    /* Are the arguments valid? */

  if (!new_block)

    return CBF_ARGUMENT;


    /* Initialise */

  *new_block = NULL;

  if (new_nelem)

    *new_nelem = 0;


    /* Allocate the memory */

  return cbf_realloc (new_block, new_nelem, elsize, nelem);
}


  /* Free a block of memory as a string */

int cbf_free_text(const char **old_block, size_t *old_nelem)
{

  void * vold_block;

  vold_block = (void *)*old_block;

  cbf_failnez(cbf_free(&vold_block, old_nelem))

  *old_block = NULL;

  return 0;

}

  /* Free a block of memory */

int cbf_free (void **old_block, size_t *old_nelem)
{
    /* Are the arguments valid? */

  if (!old_block)

    return CBF_ARGUMENT;


    /* Free the memory */

  if (*old_block)  {

#ifdef CBFLIB_MEM_DEBUG
  
    char * cold_block;
    
    cold_block = (void *)(*old_block);
  
    (cold_block) -= sizeof(size_t);
    
    *old_block = (char *)cold_block;
  
    memory_allocated -= *(size_t *)(*old_block); 
    
    fprintf(stderr,"freeing %ld size %ld\n",(long)(*old_block),(long)(*(size_t *)(*old_block)));

#endif

    free (*old_block);
    
  }

  *old_block = NULL;

  if (old_nelem)

    *old_nelem = 0;


    /* Success */

  return 0;
}


#ifdef __cplusplus

}

#endif

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