faux/lub/heap/heap_realloc.c

#include <string.h>
#include <assert.h>

#include "cache.h"

/*--------------------------------------------------------- */
lub_heap_status_t
lub_heap_realloc(lub_heap_t * this,
		 char **ptr, size_t requested_size, lub_heap_align_t alignment)
{
	lub_heap_status_t status = LUB_HEAP_FAILED;
	size_t size = requested_size;

	/* opportunity for leak detection to do it's stuff */
	lub_heap_pre_realloc(this, ptr, &size);

	if (this->cache && (LUB_HEAP_ALIGN_NATIVE == alignment)) {
		/* try and get the memory from the cache */
		status = lub_heap_cache_realloc(this, ptr, size);
	} else {
		/* get the memory directly from the dynamic heap */
		status = lub_heap_raw_realloc(this, ptr, size, alignment);
	}

	/* opportunity for leak detection to do it's stuff */
	lub_heap_post_realloc(this, ptr);

	if (LUB_HEAP_OK == status) {
		/* update the high tide markers */
		if ((this->stats.alloc_bytes + this->stats.alloc_overhead)
		    > (this->stats.alloc_hightide_bytes +
		       this->stats.alloc_hightide_overhead)) {
			this->stats.alloc_hightide_blocks =
			    this->stats.alloc_blocks;
			this->stats.alloc_hightide_bytes =
			    this->stats.alloc_bytes;
			this->stats.alloc_hightide_overhead =
			    this->stats.alloc_overhead;
			this->stats.free_hightide_blocks =
			    this->stats.free_blocks;
			this->stats.free_hightide_bytes =
			    this->stats.free_bytes;
			this->stats.free_hightide_overhead =
			    this->stats.free_overhead;
		}
	} else {
		/* this call enables a debugger to catch failures */
		lub_heap_stop_here(status, *ptr, requested_size);
	}
	if ((0 == requested_size) && (NULL == *ptr) && (LUB_HEAP_OK == status)) {
		/* make sure that client doesn't use this (non-existant memory) */
		*ptr = LUB_HEAP_ZERO_ALLOC;
	}
	return status;
}

/*--------------------------------------------------------- */