Additionally test a UTF-8 string where each code point translates to three
UTF-8 bytes.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

The u16_strlcat() is in units of u16 not bytes.  So the limit needs to
be ARRAY_SIZE() instead of sizeof().

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>

strlcat returns min(strlen(dest), count)+strlen(src). Make u16_strlcat's
behaviour the same for consistency.

Fixes: eca08ce94ceb ("lib/charset: add u16_strlcat() function")
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>

Wrap the assert macros in ({ ... }) so they can be safely used both as
right side argument as well as in conditionals without curly brackets
around them. In the process, find a bunch of missing semicolons, fix
them.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Provide a unit test for u16_strcasecmp().

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

Add the missing unit test. It can be executed with:

    ut unicode u16_strnlen

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

Provide a unit test for function u16_strlcat().

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

Check that snprintf() returns the correct required buffer length and prints
the correct string for UTF-16 strings.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

At present we use wide characters for Unicode but this is not necessary.
Change the code to use the 'u' literal instead. This helps to fix build
warnings for sandbox on the Raspberry Pi.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Prepare v2021.04-rc4