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/* ==========================================
* Unity Project - A Test Framework for C
* Copyright (c) 2007 Mike Karlesky, Mark VanderVoord, Greg Williams
* [Released under MIT License. Please refer to license.txt for details]
* ========================================== */
#include "unity.h"
#include "unity_memory.h"
#include <string.h>
#define MALLOC_DONT_FAIL -1
static int malloc_count;
static int malloc_fail_countdown = MALLOC_DONT_FAIL;
void UnityMalloc_StartTest(void)
{
malloc_count = 0;
malloc_fail_countdown = MALLOC_DONT_FAIL;
}
void UnityMalloc_EndTest(void)
{
malloc_fail_countdown = MALLOC_DONT_FAIL;
if (malloc_count != 0)
{
UNITY_TEST_FAIL(Unity.CurrentTestLineNumber, "This test leaks!");
}
}
void UnityMalloc_MakeMallocFailAfterCount(int countdown)
{
malloc_fail_countdown = countdown;
}
/* These definitions are always included from unity_fixture_malloc_overrides.h */
/* We undef to use them or avoid conflict with <stdlib.h> per the C standard */
#undef malloc
#undef free
#undef calloc
#undef realloc
#ifdef UNITY_EXCLUDE_STDLIB_MALLOC
static unsigned char unity_heap[UNITY_INTERNAL_HEAP_SIZE_BYTES];
static size_t heap_index;
#else
#include <stdlib.h>
#endif
typedef struct GuardBytes
{
size_t size;
size_t guard_space;
} Guard;
#define UNITY_MALLOC_ALIGNMENT (UNITY_POINTER_WIDTH / 8)
static const char end[] = "END";
static size_t unity_size_round_up(size_t size)
{
size_t rounded_size;
rounded_size = ((size + UNITY_MALLOC_ALIGNMENT - 1) / UNITY_MALLOC_ALIGNMENT) * UNITY_MALLOC_ALIGNMENT;
return rounded_size;
}
void* unity_malloc(size_t size)
{
char* mem;
Guard* guard;
size_t total_size;
total_size = sizeof(Guard) + unity_size_round_up(size + sizeof(end));
if (malloc_fail_countdown != MALLOC_DONT_FAIL)
{
if (malloc_fail_countdown == 0)
return NULL;
malloc_fail_countdown--;
}
if (size == 0) return NULL;
#ifdef UNITY_EXCLUDE_STDLIB_MALLOC
if (heap_index + total_size > UNITY_INTERNAL_HEAP_SIZE_BYTES)
{
guard = NULL;
}
else
{
/* We know we can get away with this cast because we aligned memory already */
guard = (Guard*)(void*)(&unity_heap[heap_index]);
heap_index += total_size;
}
#else
guard = (Guard*)UNITY_MALLOC(total_size);
#endif
if (guard == NULL) return NULL;
malloc_count++;
guard->size = size;
guard->guard_space = 0;
mem = (char*)&(guard[1]);
memcpy(&mem[size], end, sizeof(end));
return (void*)mem;
}
static int isOverrun(void* mem)
{
Guard* guard = (Guard*)mem;
char* memAsChar = (char*)mem;
guard--;
return guard->guard_space != 0 || strcmp(&memAsChar[guard->size], end) != 0;
}
static void release_memory(void* mem)
{
Guard* guard = (Guard*)mem;
guard--;
malloc_count--;
#ifdef UNITY_EXCLUDE_STDLIB_MALLOC
{
size_t block_size;
block_size = unity_size_round_up(guard->size + sizeof(end));
if (mem == unity_heap + heap_index - block_size)
{
heap_index -= (sizeof(Guard) + block_size);
}
}
#else
UNITY_FREE(guard);
#endif
}
void unity_free(void* mem)
{
int overrun;
if (mem == NULL)
{
return;
}
overrun = isOverrun(mem);
release_memory(mem);
if (overrun)
{
UNITY_TEST_FAIL(Unity.CurrentTestLineNumber, "Buffer overrun detected during free()");
}
}
void* unity_calloc(size_t num, size_t size)
{
void* mem = unity_malloc(num * size);
if (mem == NULL) return NULL;
memset(mem, 0, num * size);
return mem;
}
void* unity_realloc(void* oldMem, size_t size)
{
Guard* guard = (Guard*)oldMem;
void* newMem;
if (oldMem == NULL) return unity_malloc(size);
guard--;
if (isOverrun(oldMem))
{
release_memory(oldMem);
UNITY_TEST_FAIL(Unity.CurrentTestLineNumber, "Buffer overrun detected during realloc()");
}
if (size == 0)
{
release_memory(oldMem);
return NULL;
}
if (guard->size >= size) return oldMem;
#ifdef UNITY_EXCLUDE_STDLIB_MALLOC /* Optimization if memory is expandable */
{
size_t old_total_size = unity_size_round_up(guard->size + sizeof(end));
if ((oldMem == unity_heap + heap_index - old_total_size) &&
((heap_index - old_total_size + unity_size_round_up(size + sizeof(end))) <= UNITY_INTERNAL_HEAP_SIZE_BYTES))
{
release_memory(oldMem); /* Not thread-safe, like unity_heap generally */
return unity_malloc(size); /* No memcpy since data is in place */
}
}
#endif
newMem = unity_malloc(size);
if (newMem == NULL) return NULL; /* Do not release old memory */
memcpy(newMem, oldMem, guard->size);
release_memory(oldMem);
return newMem;
}
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