sldns_fget_token
i = sldns_fget_token(f, fkeyword, k_del, LDNS_MAX_KEYWORDLEN);
ssize_t sldns_fget_token(FILE *f, char *token, const char *delim, size_t limit);
i = sldns_fget_token(f, fkeyword, k_del, LDNS_MAX_KEYWORDLEN);
ssize_t sldns_fget_token(FILE *f, char *token, const char *delim, size_t limit);