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x11: check and document the correct range of device IDs 

The actual value is 127, not 255.

https://bugs.freedesktop.org/show_bug.cgi?id=104321

Reported-by: Gatis Paeglis <gatis.paeglis@qt.io>
Signed-off-by: Ran Benita <ran234@gmail.com>
master
Ran Benita 2017-12-18 16:41:21 +02:00
parent b82e3b764e
commit 4fccdee383
2 changed files with 7 additions and 7 deletions
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2
src/x11/keymap.c
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@ -1155,7 +1155,7 @@ xkb_x11_keymap_new_from_device(struct xkb_context *ctx,
return NULL;
}
if (device_id < 0 || device_id > 255) {
if (device_id < 0 || device_id > 127) {
log_err_func(ctx, "illegal device ID: %d\n", device_id);
return NULL;
}

12
xkbcommon/xkbcommon-x11.h
View File

@ -64,10 +64,9 @@ extern "C" {
*
* The XKB extension supports using separate keymaps and states for
* different keyboard devices. The devices are identified by an integer
* device ID and are managed by another X11 extension, XInput (or its
* successor, XInput2). The original X11 protocol only had one keyboard
* device, called the "core keyboard", which is still supported as a
* "virtual device".
* device ID and are managed by another X11 extension, XInput. The
* original X11 protocol only had one keyboard device, called the "core
* keyboard", which is still supported as a "virtual device".
*
* 3. We will use the core keyboard as an example. To get its device ID,
* use either the xcb_xkb_get_device_info() request directly, or the
@ -197,8 +196,9 @@ xkb_x11_get_core_keyboard_device_id(xcb_connection_t *connection);
* @param connection
* An XCB connection to the X server.
* @param device_id
* An XInput 1 device ID (in the range 0-255) with input class KEY.
* Passing values outside of this range is an error.
* An XInput device ID (in the range 0-127) with input class KEY.
* Passing values outside of this range is an error (the XKB protocol
* predates the XInput2 protocol, which first allowed IDs > 127).
* @param flags
* Optional flags for the keymap, or 0.
*