What's the right way to call xcb_connect_to_display_with_auth_info() given a Xauthority file?

[Laércio de Sousa]

When I try to establish a XCB connection to a given display stored in a
string e.g. dpy, I know I can do it in two different ways:

   1. Simply call xcb_connect(dpy, NULL), or
   2. Set environment variable DISPLAY to the value of dpy and call
xcb_connect(NULL,
   NULL).

However, if my X server requires a Xauthority file, I can only establish a
XCB connection if I set environment XAUTHORITY to Xauthority file path and
then call xcb_connect(dpy, NULL).

I would like to establish this connection without having to set environment
variable XAUTHORITY. I know there's a funcion in XCB API called
xcb_connect_to_display_with_auth_info() which receives a
xcb_auth_info_t struct,
but I have absolutely no idea of how to build this struct given a
Xauthority file path.

How could I do it?
Thanks in advance!
-- 
*Laércio de Sousa*
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