https://docs.oracle.com/cd/E36784_01/html/E36875/ldap-getfirstfilter-3ldap.html
ldap_getfirstfilter - man pages section 3: Networking Library Functions
These functions are used to generate filters to be used in ldap_search(3LDAP) or ldap_search_s(3LDAP) . Either ldap_init_getfilter or ldap_init_getfilter_buf...
man pagesldapsectionnetworkinglibrary