ObjFW  Diff

int
vasprintf(char **string, const char *format, va_list arguments)
{
	int length;
	va_list argumentsCopy;

	va_copy(argumentsCopy, argumentsCopy);
	va_copy(argumentsCopy, arguments);

	if ((length = vsnprintf(NULL, 0, format, argumentsCopy)) < 0)
		return length;
	if ((*string = malloc((size_t)length + 1)) == NULL)
		return -1;

	return vsnprintf(*string, (size_t)length + 1, format, arguments);