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33 * @(#)rec_seq.c 8.3 (Berkeley) 7/14/94
34 * $DragonFly: src/lib/libcr/db/recno/Attic/rec_seq.c,v 1.2 2003/06/17 04:26:42 dillon Exp $
37 #include <sys/types.h>
48 * __REC_SEQ -- Recno sequential scan interface.
51 * dbp: pointer to access method
52 * key: key for positioning and return value
53 * data: data return value
54 * flags: R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV.
57 * RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
60 __rec_seq(dbp, key, data, flags)
72 /* Toss any page pinned across calls. */
73 if (t->bt_pinned != NULL) {
74 mpool_put(t->bt_mp, t->bt_pinned, 0);
80 if ((nrec = *(recno_t *)key->data) == 0)
84 if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
85 nrec = t->bt_cursor.rcursor + 1;
93 if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
94 if ((nrec = t->bt_cursor.rcursor - 1) == 0)
100 if (!F_ISSET(t, R_EOF | R_INMEM) &&
101 t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
106 einval: errno = EINVAL;
110 if (t->bt_nrecs == 0 || nrec > t->bt_nrecs) {
111 if (!F_ISSET(t, R_EOF | R_INMEM) &&
112 (status = t->bt_irec(t, nrec)) != RET_SUCCESS)
114 if (t->bt_nrecs == 0 || nrec > t->bt_nrecs)
115 return (RET_SPECIAL);
118 if ((e = __rec_search(t, nrec - 1, SEARCH)) == NULL)
121 F_SET(&t->bt_cursor, CURS_INIT);
122 t->bt_cursor.rcursor = nrec;
124 status = __rec_ret(t, e, nrec, key, data);
125 if (F_ISSET(t, B_DB_LOCK))
126 mpool_put(t->bt_mp, e->page, 0);
128 t->bt_pinned = e->page;