/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

   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; version 2 of the License.

   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */

/* Not MT-SAFE */

#include "mysys_priv.h"

#include "my_static.h"

#include "mysys_err.h"

#include <m_string.h>

/*

  Alloc for things we don't nend to free run-time (that only

  should be free'd on exit)

  SYNOPSIS

    my_once_alloc()

      Size

      MyFlags

  NOTES

    No DBUG_ENTER... here to get smaller dbug-startup 

*/

void* my_once_alloc(size_t Size, myf MyFlags)

{

  size_t get_size, max_left;

  uchar* point;

  reg1 USED_MEM *next;

  reg2 USED_MEM **prev;

  Size= ALIGN_SIZE(Size);

  prev= &my_once_root_block;

  max_left=0;

  for (next=my_once_root_block ; next && next->left < Size ; next= next->next)

  {

    if (next->left > max_left)

      max_left=next->left;

    prev= &next->next;

  }

  if (! next)

  {           /* Time to alloc new block */

    get_size= Size+ALIGN_SIZE(sizeof(USED_MEM));

    if (max_left*4 < my_once_extra && get_size < my_once_extra)

      get_size=my_once_extra;     /* Normal alloc */

    if ((next = (USED_MEM*) malloc(get_size)) == 0)

    {

      my_errno=errno;

      if (MyFlags & (MY_FAE+MY_WME))

  my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_FATAL), get_size);

      return((uchar*) 0);

    }

    DBUG_PRINT("test",("my_once_malloc %lu byte malloced", (ulong) get_size));

    next->next= 0;

    next->size= get_size;

    next->left= get_size-ALIGN_SIZE(sizeof(USED_MEM));

    *prev=next;

  }

  point= (uchar*) ((char*) next+ (next->size-next->left));

  next->left-= Size;

  if (MyFlags & MY_ZEROFILL)

    bzero(point, Size);

  return((void*) point);

} /* my_once_alloc */

char *my_once_strdup(const char *src,myf myflags)

{

  size_t len= strlen(src)+1;

  uchar *dst= my_once_alloc(len, myflags);

  if (dst)

    memcpy(dst, src, len);

  return (char*) dst;

}

void *my_once_memdup(const void *src, size_t len, myf myflags)

{

  uchar *dst= my_once_alloc(len, myflags);

  if (dst)

    memcpy(dst, src, len);

  return dst;

}

/*

  Deallocate everything that was allocated with my_once_alloc

  SYNOPSIS

    my_once_free()

*/

void my_once_free(void)

{

  reg1 USED_MEM *next,*old;

  DBUG_ENTER("my_once_free");

  for (next=my_once_root_block ; next ; )

  {

    old=next; next= next->next ;

    free((uchar*) old);

  }

  my_once_root_block=0;

  DBUG_VOID_RETURN;

} /* my_once_free */