hidd_button_list_same()

Get button usages common to two button usage lists

Synopsis:

#include <sys/hiddi.h>

int hidd_button_list_same( _Uint16t *current,
                           _Uint16t *previous,
                           _Uint16t *same,
                           _Uint16t *len );

Arguments:

current
An array of button usages as returned by hidd_get_buttons().
previous

An array of button usages as returned by hidd_get_buttons().

same
A user-provided buffer to report the list of usages that are in both current and previous.
len
The number of elements in the provided buffer. On return it will contain the number usages filled in the provided diff buffer.
Note:
The same array must contain at least len elements, while the current and previous arrays must either contain at least len elements, or have the last element set to 0.

Description:

The hidd_button_list_same() function gets the list of buttons that are in both current and previous. You would typically use this function to determine what buttons have been repeated in successive calls to hidd_get_buttons(). Use hidd_button_list_diff() to get a list of new buttons pressed, or old buttons released.

Returns:

EOK
Success.
EINVAL
One of the arguments is NULL.

Classification:

QNX OS

Safety:
Cancellation point Yes
Signal handler No
Thread Yes
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