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/*
* libmowgli: A collection of useful routines for programming.
* mowgli_alloc.c: Safe, portable implementations of malloc, calloc, and free.
*
* Copyright (c) 2007 William Pitcock <nenolod -at- sacredspiral.co.uk>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "mowgli.h"
/*
* bootstrapped allocators so that we can initialise without blowing up
*/
static void *
_mowgli_bootstrap_alloc(int size)
{
return calloc(size, 1);
}
static void
_mowgli_bootstrap_free(void *ptr)
{
if (ptr)
free(ptr);
}
static mowgli_allocation_policy_t _mowgli_allocator_bootstrap = {
{ 0 },
_mowgli_bootstrap_alloc,
_mowgli_bootstrap_free
};
static mowgli_allocation_policy_t *_mowgli_allocator = &_mowgli_allocator_bootstrap;
/*
* \brief Allocates an array of data that contains "count" objects,
* of "size" size.
*
* Usually, this wraps calloc().
*
* \param size size of objects to allocate.
* \param count amount of objects to allocate.
*
* \return A pointer to a memory buffer.
*/
void *
mowgli_alloc_array(size_t size, size_t count)
{
return_val_if_fail(_mowgli_allocator != NULL, NULL);
return _mowgli_allocator->allocate(size * count);
}
/*
* \brief Allocates an object of "size" size.
*
* This is the equivilant of calling mowgli_alloc_array(size, 1).
*
* \param size size of object to allocate.
*
* \return A pointer to a memory buffer.
*/
void *
mowgli_alloc(size_t size)
{
return mowgli_alloc_array(size, 1);
}
/*
* \brief Frees an object back to the system memory pool.
*
* Wraps free protecting against common mistakes (reports an error instead).
*
* \param ptr pointer to object to free.
*/
void
mowgli_free(void *ptr)
{
return_if_fail(_mowgli_allocator != NULL);
return_if_fail(ptr != NULL);
_mowgli_allocator->deallocate(ptr);
}
/*
* \brief Sets the mowgli.allocation_policy used by the allocation primitives.
*
* \param policy The mowgli_allocation_policy_t object to use.
*/
void
mowgli_allocator_set_policy(mowgli_allocation_policy_t *policy)
{
return_if_fail(policy != NULL);
_mowgli_allocator = policy;
}
/*
* \brief Sets the mowgli.allocation_policy used by the allocation primitives,
* when given a name.
*
* \param name The name of the policy to use.
*/
void
mowgli_allocator_set_policy_by_name(const char *name)
{
mowgli_allocation_policy_t *policy;
return_if_fail(name != NULL);
policy = mowgli_allocation_policy_lookup(name);
if (policy == NULL)
return;
mowgli_allocator_set_policy(policy);
}
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