static int r_read_and (RSFD rfd, void *buf, int *term_index);
static int r_read_or (RSFD rfd, void *buf, int *term_index);
static int r_read_not (RSFD rfd, void *buf, int *term_index);
static int r_read_and (RSFD rfd, void *buf, int *term_index);
static int r_read_or (RSFD rfd, void *buf, int *term_index);
static int r_read_not (RSFD rfd, void *buf, int *term_index);