Re: [libgpiod][PATCH v4] treewide: unify gpiod_line_config/request_get_offsets() functions

[Viresh Kumar <viresh.kumar@linaro.org>]

On 24-01-23, 10:58, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> 
> We have two functions in the C API that allow users to retrieve a list
> of offsets from objects: gpiod_line_request_get_offsets() and
> gpiod_line_config_get_offsets(). Even though they serve pretty much the
> same purpose, they have different signatures and one of them also
> requires the user to free the memory allocated within the libgpiod
> library with a non-libgpiod free() function.
> 
> Unify them: make them take the array in which to store offsets and the
> size of this array. Make them return the number of offsets actually
> stored in the array and make them impossible to fail. Change their names
> to be more descriptive and in the case of line_config: add a new function
> that allows users to get the number of configured offsets.
> 
> Update the entire tree to use the new interfaces.
> 
> For rust bindings: also unify the line config interface to return a map
> of line settings like C++ bindings do instead of having a function to
> get settings by offset. A map returned from a single call is easier to
> iterate over with a for loop than using an integer and calling the
> previous line_settings() method.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> ---
> v2 -> v3:
> - use a custom type for the offset -> Settings mapping (defined as an
>   IntMap<line::Settings>)
> - add missing '// SAFETY' comments
> - apply cargo fmt
> 
> v3 -> v4:
> - apply missing cargo fmt hints (by using rustfmt)

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

-- 
viresh