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LDAP_FIRST_ATTRIBUTE(3)    Library Functions Manual    LDAP_FIRST_ATTRIBUTE(3)

       ldap_first_attribute, ldap_next_attribute - step through LDAP entry

       OpenLDAP LDAP (libldap, -lldap)

       #include <ldap.h>

       char *ldap_first_attribute(
            LDAP *ld, LDAPMessage *entry, BerElement **berptr )

       char *ldap_next_attribute(
            LDAP *ld, LDAPMessage *entry, BerElement *ber )

       The ldap_first_attribute() and ldap_next_attribute() routines are used
       to step through the attributes in an LDAP entry.
       ldap_first_attribute() takes an entry as returned by
       ldap_first_entry(3) or ldap_next_entry(3) and returns a pointer to
       character string containing the first attribute description in the
       entry.  ldap_next_attribute() returns the next attribute description in
       the entry.

       It also returns, in berptr, a pointer to a BerElement it has allocated
       to keep track of its current position.  This pointer should be passed
       to subsequent calls to ldap_next_attribute() and is used to effectively
       step through the entry's attributes.  The caller is solely responsible
       for freeing the BerElement pointed to by berptr when it is no longer
       needed by calling ber_free(3).  When calling ber_free(3) in this
       instance, be sure the second argument is 0.

       The attribute names returned are suitable for inclusion in a call to
       ldap_get_values(3) to retrieve the attribute's values.

       If an error occurs, NULL is returned and the ld_errno field in the ld
       parameter is set to indicate the error.  See ldap_error(3) for a
       description of possible error codes.

       The ldap_first_attribute() and ldap_next_attribute() return dynamically
       allocated memory that must be freed by the caller via ldap_memfree(3).

       ldap(3), ldap_first_entry(3), ldap_get_values(3), ldap_error(3)

       OpenLDAP Software is developed and maintained by The OpenLDAP Project
       <http://www.openldap.org/>.  OpenLDAP Software is derived from the
       University of Michigan LDAP 3.3 Release.

OpenLDAP 2.4.50                   2020/04/28           LDAP_FIRST_ATTRIBUTE(3)