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Status Future consideration
Workspace Informix
Created by Guest
Created on Feb 12, 2021

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!

"..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..."

Needed by Date May 1, 2021