[alsa-devel] Alsa-lib strings?
Takashi Iwai
tiwai at suse.de
Fri Sep 30 10:41:55 CEST 2016
On Fri, 30 Sep 2016 09:50:57 +0200,
Clemens Ladisch wrote:
>
> David Henningsson wrote:
> > 1a) can I count on alsa-lib's strings (everything from card name and
> > mixer identifiers to various descriptions) to be UTF-8 or perhaps
> > even 7-bit?
>
> Alsa-lib itself does not care about the encoding.
>
> The strings are whatever the kernel uses. In practice, this almost
> always means ASCII, but kernel policy is UTF-8. (At the moment, the
> only way I know of to get a non-ASCII string is from a USB device.)
>
> Alsa-lib can also return strings from configuration files. These are
> encoded in whatever the editor happens to use, i.e., in practice, UTF-8.
>
> > 1b) In what way can buggy drivers violate the answers to 1a?
>
> The USB driver is not buggy. :) But in theory, you could get any random
> crap.
>
> For testing, you can change a card's "id" attribute in sysfs.
The ID string should be OK, as it's filtered in
copy_valid_id_string(). But the other name strings have no checks,
thus may have non-ASCII letters (in theory).
Takashi
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