The basic situation is this: a list of CARD8/CARD16s followed by a list
of CARD16/CARD32s. In the current code, the second list is aligned to
1/2 bytes according the size of the first list. However, in some cases
the second list needs to be aligned to 4 bytes per the xkbproto spec:
http://www.x.org/releases/current/doc/kbproto/xkbproto.html#appD::Requests
XkbGetMap reply (xkb-opcode 8):
[...]
a LISTofCARD8 actsRtrn.count
p unused,p=pad(a)
8A LISTofKB_ACTION actsRtrn.acts
4B LISTofKB_SETBEHAVIOR behaviorsRtrn
v LISTofSETofKEYMASK vmodsRtrn
p unused, p=pad(v)
2E LISTofKB_SETEXPLICIT explicitRtrn
p unused,p=pad(2E)
2M LISTofKB_KEYMODMAP modmapRtrn
p unused, p=pad(2M)
[...]
XkbGetNames reply (xkb-opcode 17):
[...]
l LISTofCARD8 nLevelsPerType, sum of all elements=L
p unused, p=pad(l)
[...]
The server and Xlib handle this with calls to XkbPaddedSize(), which is
a good way to see where the extra padding is needed.
Signed-off-by: Ran Benita <ran234@gmail.com>
Reviewed-by: Daniel Martin <consume.noise@gmail.com>