From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: new idl helper, append to Array
Date: Thu, 4 Feb 2016 11:07:58 +0100
Message-ID: <20160204100758.GA3492@aepfle.de>
References: <20160204092353.GA17709@aepfle.de>
	<1454579894.25207.144.camel@citrix.com>
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To: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>, xen-devel@lists.xen.org
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On Thu, Feb 04, Ian Campbell wrote:

> I think the append_to variant is probably least gross.

libxl_device_vscsidev_append_to_vscsictrl() would work too.

This is what I will use for the time being (modulo introduced runtime bugs):

void libxl_device_vscsictrl_append_vscsidev(libxl_ctx *ctx,
                                            libxl_device_vscsictrl *ctrl,
                                            libxl_device_vscsidev *dev)
{
    GC_INIT(ctx);
    ctrl->vscsidevs = libxl__realloc(NOGC, ctrl->vscsidevs, sizeof(*dev) * (ctrl->num_vscsidevs + 1));
    libxl_device_vscsidev_init(ctrl->vscsidevs + ctrl->num_vscsidevs);
    libxl_device_vscsidev_copy(CTX, ctrl->vscsidevs + ctrl->num_vscsidevs, dev);
    ctrl->num_vscsidevs++;
    GC_FREE;
}


> Wei, is it necessary to init the dst before copy into it?

It would clear the padding between members, a plain copy will leave them
uninitialized.

Olaf