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#include <heap.h>
#include <task.h>
#define HEAP_ALIGN 16
typedef struct {
uint32_t size;
void *next;
} __attribute__ ((packed)) alloc_t;
static alloc_t *free_blocks;
static void *heap_end;
static uint32_t heap_used;
void heap_init(void *buf)
{
heap_end = buf;
free_blocks = 0;
heap_used = 0;
}
void *malloc(uint32_t size)
{
//task_hold(1);
size = (size + sizeof(alloc_t) + HEAP_ALIGN) & ~(HEAP_ALIGN - 1);
alloc_t *node = free_blocks;
alloc_t *prev = 0;
while (node != 0) {
if (node->size >= size) {
if (prev != 0)
prev->next = node->next;
else
free_blocks = node->next;
node->next = 0;
heap_used += node->size;
return (void *)((uint8_t *)node + sizeof(alloc_t));
}
prev = node;
node = node->next;
}
node = (alloc_t *)heap_end;
node->size = size;
node->next = 0;
heap_end = (void *)((uint8_t *)heap_end + size);
heap_used += size;
//task_hold(0);
return (void *)((uint8_t *)node + sizeof(alloc_t));
}
void *calloc(uint32_t count, uint32_t size)
{
uint8_t *buf = malloc(count * size);
for (uint32_t i = 0; i < count * size; i++)
buf[i] = 0;
return buf;
}
void free(void *buf)
{
if (buf == 0)
return;
alloc_t *alloc = (alloc_t *)((uint8_t *)buf - sizeof(alloc_t));
heap_used -= alloc->size;
alloc->next = free_blocks;
free_blocks = alloc;
}
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