swoole_buffer提供的expend操作用于为缓存区扩容。
swoole_buffer->expand(int $new_size);
- $new_size 指定新的缓冲区尺寸,必须大于当前的尺寸
下面我们看下其实现过程。
static PHP_METHOD(swoole_buffer, expand)
{
long size = -1;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &size) == FAILURE)
{
RETURN_FALSE;
}
swString *buffer = swoole_get_object(getThis());
if (size <= buffer->size)
{
php_error_docref(NULL TSRMLS_CC, E_WARNING, "new size must be more than %ld", buffer->size);
RETURN_FALSE;
}
if (swString_extend(buffer, size) == SW_OK)
{
zend_update_property_long(swoole_buffer_class_entry_ptr, getThis(), ZEND_STRL("capacity"), size TSRMLS_CC);
RETURN_TRUE;
}
else
{
RETURN_FALSE;
}
}