Stack.c

 
#include <winpr/config.h>
 
#include <winpr/collections.h>
#include <winpr/assert.h>
 
struct s_wStack
{
  size_t size;
  size_t capacity;
  void** array;
  CRITICAL_SECTION lock;
  BOOL synchronized;
  wObject object;
};
 
size_t Stack_Count(wStack* stack)
{
  size_t ret = 0;
  WINPR_ASSERT(stack);
  if (stack->synchronized)
    EnterCriticalSection(&stack->lock);
 
  ret = stack->size;
 
  if (stack->synchronized)
    LeaveCriticalSection(&stack->lock);
 
  return ret;
}
 
BOOL Stack_IsSynchronized(wStack* stack)
{
  WINPR_ASSERT(stack);
  return stack->synchronized;
}
 
wObject* Stack_Object(wStack* stack)
{
  WINPR_ASSERT(stack);
  return &stack->object;
}
 
void Stack_Clear(wStack* stack)
{
  WINPR_ASSERT(stack);
  if (stack->synchronized)
    EnterCriticalSection(&stack->lock);
 
  for (size_t index = 0; index < stack->size; index++)
  {
    if (stack->object.fnObjectFree)
      stack->object.fnObjectFree(stack->array[index]);
 
    stack->array[index] = NULL;
  }
 
  stack->size = 0;
 
  if (stack->synchronized)
    LeaveCriticalSection(&stack->lock);
}
 
BOOL Stack_Contains(wStack* stack, const void* obj)
{
  BOOL found = FALSE;
 
  WINPR_ASSERT(stack);
  if (stack->synchronized)
    EnterCriticalSection(&stack->lock);
 
  for (size_t i = 0; i < stack->size; i++)
  {
    if (stack->object.fnObjectEquals(stack->array[i], obj))
    {
      found = TRUE;
      break;
    }
  }
 
  if (stack->synchronized)
    LeaveCriticalSection(&stack->lock);
 
  return found;
}
 
void Stack_Push(wStack* stack, void* obj)
{
  WINPR_ASSERT(stack);
  if (stack->synchronized)
    EnterCriticalSection(&stack->lock);
 
  if ((stack->size + 1) >= stack->capacity)
  {
    const size_t new_cap = stack->capacity * 2;
    void** new_arr = (void**)realloc((void*)stack->array, sizeof(void*) * new_cap);
 
    if (!new_arr)
      goto end;
 
    stack->array = new_arr;
    stack->capacity = new_cap;
  }
 
  stack->array[(stack->size)++] = obj;
 
end:
  if (stack->synchronized)
    LeaveCriticalSection(&stack->lock);
}
 
void* Stack_Pop(wStack* stack)
{
  void* obj = NULL;
 
  WINPR_ASSERT(stack);
  if (stack->synchronized)
    EnterCriticalSection(&stack->lock);
 
  if (stack->size > 0)
    obj = stack->array[--(stack->size)];
 
  if (stack->synchronized)
    LeaveCriticalSection(&stack->lock);
 
  return obj;
}
 
void* Stack_Peek(wStack* stack)
{
  void* obj = NULL;
 
  WINPR_ASSERT(stack);
  if (stack->synchronized)
    EnterCriticalSection(&stack->lock);
 
  if (stack->size > 0)
    obj = stack->array[stack->size - 1];
 
  if (stack->synchronized)
    LeaveCriticalSection(&stack->lock);
 
  return obj;
}
 
static BOOL default_stack_equals(const void* obj1, const void* obj2)
{
  return (obj1 == obj2);
}
 
wStack* Stack_New(BOOL synchronized)
{
  wStack* stack = NULL;
  stack = (wStack*)calloc(1, sizeof(wStack));
 
  if (!stack)
    return NULL;
 
  stack->object.fnObjectEquals = default_stack_equals;
  stack->synchronized = synchronized;
  stack->capacity = 32;
  stack->array = (void**)calloc(stack->capacity, sizeof(void*));
 
  if (!stack->array)
    goto out_free;
 
  if (stack->synchronized && !InitializeCriticalSectionAndSpinCount(&stack->lock, 4000))
    goto out_free;
 
  return stack;
out_free:
  WINPR_PRAGMA_DIAG_PUSH
  WINPR_PRAGMA_DIAG_IGNORED_MISMATCHED_DEALLOC
  Stack_Free(stack);
  WINPR_PRAGMA_DIAG_POP
  return NULL;
}
 
void Stack_Free(wStack* stack)
{
  if (stack)
  {
    if (stack->synchronized)
      DeleteCriticalSection(&stack->lock);
 
    free((void*)stack->array);
    free(stack);
  }
}