Arguments

The function ba_list_class_names() is passed the following arguments:

Structures of type ba_class_pair_t are defined as follows:

typedef struct {
	ba_name_t       parent;   /* name of the parent */
	ba_name_t       child;    /* name of the class */
} ba_class_pair_t;

Structures of type ba_class_pair_t contain a pair of structures of type ba_name_t, which are defined as follows:

typedef struct {
	char    name[BA_NAMES_LEN + 1];
	char    padding[3];
	u_short namelen;
	char    padding2[2];
} ba_name_t;

You must always allocate sufficient memory for the buffer, the size of which is dependent on the number of classes. For example:

int nclasses;
ba_class_pairs_t *classesp;

nclasses = ba_get_num_classes("hme0");
if (nclasses > 0) {
	classesp = (ba_class_pairs_t *) calloc(nclasses,sizeof ba_class_pairs_t);
	if (ba_list_class_names("hme0", classesp) != -1) {
		/* process classesp ... */
	} else {
		/* error handling */
	}
	free(classesp);
}