BIO *bio_open_owner(const char *filename, int format, int private);
BIO *bio_open_default(const char *filename, char mode, int format);
BIO *bio_open_default_quiet(const char *filename, char mode, int format);
+char *app_conf_try_string(const CONF *cnf, const char *group, const char *name);
CONF *app_load_config_bio(BIO *in, const char *filename);
# define app_load_config(filename) app_load_config_internal(filename, 0)
# define app_load_config_quiet(filename) app_load_config_internal(filename, 1)