define external counter function SQLGetEnvAttr
     (  read-only SQL_handle_type EnvironmentHandle,
        value counter Attribute,
        read-only SQL_vector_type Value,
        value counter BufferLength,
        modifiable counter StringLength )

Returns the current setting of an environment attribute.

Input arguments:

• EnvironmentHandle.
• Attribute. The attribute identifier.
• Value. The current value of the specified attribute.
• BufferLength. The maximum length of Value.

Output argument:

• StringLength. The returned length of Value.