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Informix ESQL/C ifx_var_getdata() should do charset conversion when binding with CLVCHARPTRTYPE

Environment: Linux Debian 10.7 or Windows 10 Informix server: IDS-14.10.FC5 Informix client: CSDK 4.50.FC5

With the DB in UTF-8 (DB_LOCALE = en_us.utf8) and client app in another character encoding (CLIENT_LOCALE=en_us.8859-15):

When fetching an LVARCHAR column, and binding with ifx_sqlvar_t sqltype=CLVCHARPTRTYPE, after the fetch we want to get the character string with ifx_var_getdata().

But it appears that the sequence of bytes returned by the ifx_var_getdata() function is pure UTF-8, and is not converted to ISO-8859-15 ...

Documentation says that this function returns ASCII data ... we assume that no conversion is done at all and it returns just the UTF-8 byte sequence.

The string should be converted to the charset of CLIENT_LOCALE, just as when binding with CVCHARTYPE and a self-allocated buffer. But that solution is not acceptable for LVARCHAR because we would need to allocate large buffers to cover the max LVARCHAR size!

https://informix.hcldoc.com/14.10/help/index.jsp?topic=%2Fcom.ibm.esqlc.doc%2Fids_esqlc_0007.htm

"..The lvarchar pointer type is not equivalent to a C-language char pointer. Informix® ESQL/C maintains its own internal representation for the lvarchar pointer type. This representation is identical to the representation of a var binary host variable, except that it supports ASCII data as opposed to binary data..."

  • Guest
  • Feb 12 2021
  • Under Review
Who would benefit from this IDEA? Have non-UTF-8 code use UTF-8 databases and use LVARCHAR columns and avoid to allocate arbitrary large buffer
How should it work?

The string should be converted to the charset of CLIENT_LOCALE, just as when binding with CVCHARTYPE.

Idea Priority Medium

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