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29 * @(#)rec_seq.c 8.3 (Berkeley) 7/14/94
30 * $FreeBSD: head/lib/libc/db/recno/rec_seq.c 189327 2009-03-04 00:58:04Z delphij $
33 #include <sys/types.h>
44 * __REC_SEQ -- Recno sequential scan interface.
47 * dbp: pointer to access method
48 * key: key for positioning and return value
49 * data: data return value
50 * flags: R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV.
53 * RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
56 __rec_seq(const DB *dbp, DBT *key, DBT *data, unsigned int flags)
65 /* Toss any page pinned across calls. */
66 if (t->bt_pinned != NULL) {
67 mpool_put(t->bt_mp, t->bt_pinned, 0);
73 if ((nrec = *(recno_t *)key->data) == 0)
77 if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
78 nrec = t->bt_cursor.rcursor + 1;
86 if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
87 if ((nrec = t->bt_cursor.rcursor - 1) == 0)
93 if (!F_ISSET(t, R_EOF | R_INMEM) &&
94 t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
99 einval: errno = EINVAL;
103 if (t->bt_nrecs == 0 || nrec > t->bt_nrecs) {
104 if (!F_ISSET(t, R_EOF | R_INMEM) &&
105 (status = t->bt_irec(t, nrec)) != RET_SUCCESS)
107 if (t->bt_nrecs == 0 || nrec > t->bt_nrecs)
108 return (RET_SPECIAL);
111 if ((e = __rec_search(t, nrec - 1, SEARCH)) == NULL)
114 F_SET(&t->bt_cursor, CURS_INIT);
115 t->bt_cursor.rcursor = nrec;
117 status = __rec_ret(t, e, nrec, key, data);
118 if (F_ISSET(t, B_DB_LOCK))
119 mpool_put(t->bt_mp, e->page, 0);
121 t->bt_pinned = e->page;