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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2012 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
+----------------------------------------------------------------------+
*/

/* $Id$ */

#include "zend_static_allocator.h"

/* Not checking emalloc() and erealloc() return values as they are supposed to bailout */

inline static void block_init(Block *block, zend_uint block_size)
{
block->pos = block->bp = (char *) emalloc(block_size);
block->end = block->bp + block_size;
}

inline static char *block_allocate(Block *block, zend_uint size)
{
char *retval = block->pos;
if ((block->pos += size) >= block->end) {
return (char *)NULL;
}
return retval;
}

inline static void block_destroy(Block *block)
{
efree(block->bp);
}

void static_allocator_init(StaticAllocator *sa)
{
sa->Blocks = (Block *) emalloc(sizeof(Block));
block_init(sa->Blocks, ALLOCATOR_BLOCK_SIZE);
sa->num_blocks = 1;
sa->current_block = 0;
}

char *static_allocator_allocate(StaticAllocator *sa, zend_uint size)
{
char *retval;

retval = block_allocate(&sa->Blocks[sa->current_block], size);
if (retval) {
return retval;
}
sa->Blocks = (Block *) erealloc(sa->Blocks, ++sa->num_blocks);
sa->current_block++;
block_init(&sa->Blocks[sa->current_block], (size > ALLOCATOR_BLOCK_SIZE) ? size : ALLOCATOR_BLOCK_SIZE);
retval = block_allocate(&sa->Blocks[sa->current_block], size);
return retval;
}

void static_allocator_destroy(StaticAllocator *sa)
{
zend_uint i;

for (i=0; i<sa->num_blocks; i++) {
block_free(&sa->Blocks[i]);
}
efree(sa->Blocks);
}

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
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