ctlib: Implement full Unicode support for TDS 7+ (MSSQL).#576
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* Introduce CS_NLONGCHAR_TYPE and CS_NVARCHAR_TYPE, both corresponding to
SYBNVARCHAR (along with CS_UNICHAR_TYPE); have ct_param automatically
promote CS_{LONG,VAR}CHAR_TYPE to CS_N{LONG,VAR}CHAR_TYPE for TDS 7+
when non-ASCII characters appear in the data. (Unnecessary use of
Unicode types can make parameterized queries against 8-bit text
columns run very slowly.)
* ctlib/cs.c (cs_convert): Formally support Unicode destination types
(SYBNVARCHAR and SYBNTEXT).
* ctlib/ct.c (paraminfoalloc): When setting maximum length automatically,
account for possible conversion to UCS-2.
* tds/convert.c (tds_convert), tds/tds_willconvert.*: Formally support
Unicode types, giving type 103 (0x67) the benefit of the doubt as
SYBNVARCHAR rather than SYBSENSITIVITY.
* tds/data.c (tds_set_param_type): Map SYBNVARCHAR to XSYBNVARCHAR for
TDS 7+.
* tds/unittests/convert.c: Accommodate Unicode types, albeit with
strings left narrow to match real-life usage, wherein encoding
conversion occurs separately.
Signed-off-by: Aaron M. Ucko <ucko@ncbi.nlm.nih.gov>
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Split from #555.