113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/*%% (c) Copyright 1993, 1994 Hewlett-Packard Company */
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/*%% (c) Copyright 1993, 1994 International Business Machines Corp. */
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/*%% (c) Copyright 1993, 1994 Sun Microsystems, Inc. */
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/*%% (c) Copyright 1993, 1994 Novell, Inc. */
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/*%% $XConsortium: iscurpos.c /main/3 1995/10/23 11:37:08 rswiston $ */
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/*
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* Copyright (c) 1988 by Sun Microsystems, Inc.
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*/
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/*
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* @(#)iscurpos.c 1.2 95/01/06
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*
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* Description:
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* Save and restore current record position functions.
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*/
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#include "isam_impl.h"
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#include <sys/file.h>
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/*
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* err = isgetcurpos(isfd, len, buf)
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*
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* Get current record position and save it in user buffer.
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*
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* The user buffer buf is filled with (if the information is N bytes):
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* buf[0], buf[1] total length as u_short (set to N + 2)
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* buf[2] .. buf[N + 1] current record position information
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*/
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int
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isgetcurpos(int isfd, int *len, char **buf)
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{
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Fab *fab;
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u_short total_len;
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/*
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* Get File Access Block.
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*/
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if ((fab = _isfd_find(isfd)) == NULL) {
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_setiserrno2(ENOTOPEN, '9', '0');
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return (ISERROR);
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}
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total_len = sizeof(total_len) + fab->curpos.length;
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if (*buf != NULL && *len < (int)total_len) {
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_setiserrno2(E2BIG, '9', '0');
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return (ISERROR);
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}
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if (*buf == NULL) {
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*len = total_len;
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*buf = _ismalloc((unsigned int)total_len);
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}
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memcpy(*buf, (char *) &total_len, sizeof(total_len));
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memcpy(*buf+sizeof(total_len), fab->curpos.data, (int)fab->curpos.length);
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return (ISOK);
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}
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/*
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* err = issetcurpos(isfd, buf)
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*
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* Get current record position and save it in user buffer.
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*/
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int
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issetcurpos(int isfd, char *buf)
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{
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Fab *fab;
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u_short len;
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/*
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* Get File Access Block.
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*/
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if ((fab = _isfd_find(isfd)) == NULL) {
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_setiserrno2(ENOTOPEN, '9', '0');
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return (ISERROR);
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}
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memcpy((char *)&len, buf, sizeof(len));
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len -= sizeof (len);
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_bytearr_free(&fab->curpos);
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fab->curpos = _bytearr_new(len, buf + sizeof(len));
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return (ISOK);
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}
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