ODBC SQL driver: deal with different sizes of SQLTCHAR correctly

Neither the UTF-32, nor the UTF-8 recoding of a UTF-16 string is
necessarily of the same length as the input. The UTF-32 version may
be shorter, if surrogate pairs were encountered. The UTF-8 version
will be longer whenever the string contains non-US-ASCII characters.

Split toSQLTCHAR() into three functions, templated on sizeof(SQLTCHAR),
and use QVLA's range-append instead of manual memcpy()s.

This patch specifically doesn't use constexpr-if, as that's not
available until C++17, which Qt 5 doesn't require.

Change-Id: I0bfcb66eb321598908ef00ac34c888fdbccf9316
Reviewed-by: Christian Ehrlicher <[email protected]>
Reviewed-by: Thiago Macieira <[email protected]>
(cherry picked from commit 66767eea46bea0f19f8ae5ad6ebc641d86867701)
Reviewed-by: Qt Cherry-pick Bot <[email protected]>

0 files changed, 0 insertions, 0 deletions