2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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15 * without specific prior written permission.
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30 #include <sys/cdefs.h>
32 /* XXX use __SCCSID */
33 static char sccsid[] __unused = "@(#)rec_seq.c 8.3 (Berkeley) 7/14/94";
35 __FBSDID("$FreeBSD$");
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(const DB *dbp, DBT *key, DBT *data, u_int flags)
69 /* Toss any page pinned across calls. */
70 if (t->bt_pinned != NULL) {
71 mpool_put(t->bt_mp, t->bt_pinned, 0);
77 if ((nrec = *(recno_t *)key->data) == 0)
81 if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
82 nrec = t->bt_cursor.rcursor + 1;
90 if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
91 if ((nrec = t->bt_cursor.rcursor - 1) == 0)
97 if (!F_ISSET(t, R_EOF | R_INMEM) &&
98 t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
103 einval: errno = EINVAL;
107 if (t->bt_nrecs == 0 || nrec > t->bt_nrecs) {
108 if (!F_ISSET(t, R_EOF | R_INMEM) &&
109 (status = t->bt_irec(t, nrec)) != RET_SUCCESS)
111 if (t->bt_nrecs == 0 || nrec > t->bt_nrecs)
112 return (RET_SPECIAL);
115 if ((e = __rec_search(t, nrec - 1, SEARCH)) == NULL)
118 F_SET(&t->bt_cursor, CURS_INIT);
119 t->bt_cursor.rcursor = nrec;
121 status = __rec_ret(t, e, nrec, key, data);
122 if (F_ISSET(t, B_DB_LOCK))
123 mpool_put(t->bt_mp, e->page, 0);
125 t->bt_pinned = e->page;