migration: parameterized statement and cursor

Hello.

We are trying to migrate from Informix 9.4 to PostgreSQL. As part of
migration we are porting our client application.

So we need reimplement such functionality:
1. Declare a cursor using to _parameterized_ SELECT statement. It should be
possible to specify cursor's name (and, perhaps, the statement) dynamically.
2. Open that cursor (in another C-function) passing parameters to it.
3. Fetch records from result set.
4. Close the cursor.

Steps 2-4 may be repeated if necessary.

Is it possible with ecpg or libpq?

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Best regards,
Aleksey