Need help with using LDAPmod data structure

I'm trying to make updates to LDAP entries using the ldap_modify_s() API and 
I'm not having any success doing this. The LDAP code that Scott Klement posted 
recently (it can be seen at 
http://archive.midrange.com/rpg400-l/200206/msg00503.html) contained a 
definition for the LDAPmod data structure and a prototype for the 
ldap_modify_s() API.

ldap_modify_s() is prototyped as:

Dldap_modify_s    PR            10I 0 extproc('ldap_modify_s')
D ld                              *   value
D dn                              *   value options(*STRING)
D mods                            *   value

and the LDAPmod data structure is defined as:

Dp_LDAPmod        S               *
DLDAPmod          DS                  based(p_LDAPmod) align
D mod_op                        10I 0
D mod_type                        *
D modv_strvals                    *
D mod_values                      *   overlay(modv_strvals:1)
D modv_bvals                      *   overlay(modv_strvals:1)
D mod_bvalues                     *   overlay(modv_strvals:1)
D mod_next                        *

According to the documentation, the "mods" parameter is "a pointer to a 
null-terminated array of pointers to LDAPmod structures" and both mod_type and 
mod_values are pointers to null terminated arrays attributes and values to add, 
delete, or replace.

I've never done anything like this in RPG before (we're on V4R5 still so I 
can't take advantage of the enhancements to dealing with data structures in 
V5R1 that I'm sure would make this easier) and I'm completely lost. Can anyone 
either send me some sample code that shows how to use this or something like it 
or (better yet) point me to some documentation that could help me figure this 
out on my own?

Thanks,

Matt