2 * Copyright (c) 1991, 1993, 1994
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35 static char sccsid[] = "@(#)rec_seq.c 8.3 (Berkeley) 7/14/94";
38 #include <sys/types.h>
49 * __REC_SEQ -- Recno sequential scan interface.
52 * dbp: pointer to access method
53 * key: key for positioning and return value
54 * data: data return value
55 * flags: R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV.
58 * RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
61 __rec_seq(dbp, key, data, flags)
73 /* Toss any page pinned across calls. */
74 if (t->bt_pinned != NULL) {
75 mpool_put(t->bt_mp, t->bt_pinned, 0);
81 if ((nrec = *(recno_t *)key->data) == 0)
85 if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
86 nrec = t->bt_cursor.rcursor + 1;
94 if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
95 if ((nrec = t->bt_cursor.rcursor - 1) == 0)
101 if (!F_ISSET(t, R_EOF | R_INMEM) &&
102 t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
107 einval: errno = EINVAL;
111 if (t->bt_nrecs == 0 || nrec > t->bt_nrecs) {
112 if (!F_ISSET(t, R_EOF | R_INMEM) &&
113 (status = t->bt_irec(t, nrec)) != RET_SUCCESS)
115 if (t->bt_nrecs == 0 || nrec > t->bt_nrecs)
116 return (RET_SPECIAL);
119 if ((e = __rec_search(t, nrec - 1, SEARCH)) == NULL)
122 F_SET(&t->bt_cursor, CURS_INIT);
123 t->bt_cursor.rcursor = nrec;
125 status = __rec_ret(t, e, nrec, key, data);
126 if (F_ISSET(t, B_DB_LOCK))
127 mpool_put(t->bt_mp, e->page, 0);
129 t->bt_pinned = e->page;