Stored procedures with ESQL/C

We're running Informix 5.03UC1 on a couple of different hardware platforms. The question has come up about execute a dynamically specified stored procedure in ESQL/C. sprintf(string, "execute procedure %s(%d, %d, %d) into ?" $prepare sp_id from $string; returns an SQLCODE of -201 (a generic syntax error). Without the "into ?", it prepares okay, but later, on the execute statement, if we $execute sp_id using an sqlda structure, it gives us error -254, which is that too many or too few host variables are used. If we prepare it without the "into ?" and we also do not use an sqlda structure, we get an error -684, which is, logically enough, that the number of returned values is more than the number of values expected. The problem we're trying to solve is that of allowing someone to tell an application what stored procedure needs to be executed without us pre-defining the allowed stored procedures. Any suggestions on syntax or alternatives? -- William Harris (Standard disclaimers) CARS Information Systems http://www.carsinfo.com/~william/ 4000 Executive Park Drive Cincinnati, OH (USA) 45241