2 * CDE - Common Desktop Environment
4 * Copyright (c) 1993-2012, The Open Group. All rights reserved.
6 * These libraries and programs are free software; you can
7 * redistribute them and/or modify them under the terms of the GNU
8 * Lesser General Public License as published by the Free Software
9 * Foundation; either version 2 of the License, or (at your option)
12 * These libraries and programs are distributed in the hope that
13 * they will be useful, but WITHOUT ANY WARRANTY; without even the
14 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU Lesser General Public License for more
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with these libraries and programs; if not, write
20 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
21 * Floor, Boston, MA 02110-1301 USA
23 /*%% (c) Copyright 1993, 1994 Hewlett-Packard Company */
24 /*%% (c) Copyright 1993, 1994 International Business Machines Corp. */
25 /*%% (c) Copyright 1993, 1994 Sun Microsystems, Inc. */
26 /*%% (c) Copyright 1993, 1994 Novell, Inc. */
27 /*%% $XConsortium: isrewrec.c /main/3 1995/10/23 11:44:28 rswiston $ */
29 static char sccsid[] = "@(#)isrewrec.c 1.8 89/07/17 Copyr 1988 Sun Micro";
32 * Copyright (c) 1988 by Sun Microsystems, Inc.
39 * Rewrite a record in ISAM file.
43 #include "isam_impl.h"
46 static int _amrewrec(), _changekeys();
49 * err = isrewrec(isfd, recnum, record)
51 * Isrewrec() modifies a record in ISAM file. The record is identified
52 * by its record number. All indexes of the ISAM file are updated.
54 * Current record position is not changed.
55 * isrecnum is set to recnum.
57 * If the ISAM file is for variable length records, the isreclen variable
58 * must be set to indicate the actual length of the record, which must
59 * be between the minimum and maximum length, as specified in isbuild().
61 * Returns 0 if successful, or -1 of any error.
64 * EDUPL The write woul result in a duplicate on a key that
65 * does not allow duplicates.
66 * ELOCKED The file has been locked by another process.
67 * ENOTOPEN isfd does not correspond to an open ISAM file, or the
68 * ISAM file was not opened with ISINOUT mode.
69 * ENOREC Record with record number recnum does not exist.
73 isrewrec(int isfd, long recnum, char *record)
80 * Get File Access Block.
82 if ((fab = _isfd_find(isfd)) == NULL) {
83 _setiserrno2(ENOTOPEN, '9', '0');
88 * Check that the open mode was ISINOUT.
90 if (fab->openmode != OM_INOUT) {
91 _setiserrno2(ENOTOPEN, '9', '0');
96 * Determine record length. Check it against min and max record length.
98 reclen = (fab->varlength == TRUE) ? isreclen : fab->minreclen;
99 if (reclen < fab->minreclen || reclen > fab->maxreclen) {
100 _setiserrno2(EBADARG, '9', '0');
104 if ((ret = _amrewrec(&fab->isfhandle, record,
105 reclen, recnum, &fab->errcode)) == ISOK) {
106 isrecnum = recnum; /* Set isrecnum */
109 _seterr_errcode(&fab->errcode);
111 return (ret); /* Successful write */
115 * _amrewrec(isfhandle, record, reclen, recnum, errcode)
117 * _amrewrec() rewrites a record in ISAM file.
120 * isfhandle Handle of ISAM file
122 * reclen length of the record
123 * recnum record number of record to be deleted
126 * errcode error status of the operation
131 _amrewrec(Bytearray *isfhandle, char *record, int reclen, Recno recnum,
132 struct errcode *errcode)
135 char oldrecbuf[ISMAXRECLEN];
139 int (*rec_rewrite)();
144 * Get FCB corresponding to the isfhandle handle.
146 if ((fcb = _openfcb(isfhandle, errcode)) == NULL) {
151 rec_read = (fcb->varflag?_vlrec_read:_flrec_read);
152 rec_rewrite = (fcb->varflag?_vlrec_rewrite:_flrec_rewrite);
155 * Update information in FCB from CNTL page on the disk
157 (void)_isfcb_cntlpg_r2(fcb);
160 * We must read the record first to be able to delete keys.
162 if (rec_read(fcb, oldrecbuf, recnum, &reclen2) != ISOK) {
163 _amseterrcode(errcode, ENOREC);
167 if (rec_rewrite(fcb, record, recnum, reclen) != ISOK) {
168 _amseterrcode(errcode, ENOREC);
175 if ((err = _changekeys(fcb, record, oldrecbuf, recnum)) != ISOK) {
176 _amseterrcode(errcode, err);
180 _amseterrcode(errcode, ISOK);
188 * Update control page.
190 (void)_isfcb_cntlpg_w2(fcb);
201 * Restore FCB from CNTL page.
203 (void)_isfcb_cntlpg_r2(fcb);
210 _changekeys (Fcb *fcb, char *record, char *oldrecord, Recno recnum)
212 int nkeys = fcb->nkeys;
216 for (i = 0; i < nkeys; i++) {
217 if ((err =_change1key(fcb, fcb->keys + i, record, oldrecord, recnum,