102 lines
2.5 KiB
C
102 lines
2.5 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: isfd.c /main/3 1995/10/23 11:39:10 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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* isfd.c
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*
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* Description:
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* The ISAM file descriptors (isfd) are used as index to a table of
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* pointers to File Access Block objects. Isfd.c maintains the table
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* of the pointers (isfdtab).
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*
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*/
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#include "isam_impl.h"
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static Fab *isfdtab[MAXISFD]; /* Table of pointers */
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/*
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* _isfd_insert(fab)
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*
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* Insert a pointer to an Fab object to table of ISAM file descriptors.
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* Return an ISAM file descriptor, or NOISFD if the table is full.
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*/
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Isfd
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_isfd_insert(Fab *fab)
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{
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Isfd i;
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for (i = 0; i < MAXISFD; i++) {
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if (isfdtab[i] == NULL) /* Empty entry found */
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break;
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}
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if (i == MAXISFD)
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return (NOISFD); /* isfdtab is full */
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isfdtab[i] = fab;
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return (i);
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}
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/*
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* _isfd_find(isfd)
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*
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* Return a pointer to Fab object associated with the ISAM file
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* descriptor isfd. If isfd is not a file descriptor of an open ISAM file,
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* return NULL.
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*/
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Fab *
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_isfd_find(Isfd isfd)
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{
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if (isfd < 0 || isfd >= MAXISFD || isfdtab[isfd] == NULL)
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return (NULL);
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else
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return (isfdtab[isfd]);
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}
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/*
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* _isfd_delete(isfd)
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*
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* Delete an entry from isfdtab. No check is made the entry exists.
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*/
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void
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_isfd_delete(Isfd isfd)
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{
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if (isfd >= 0 && isfd < MAXISFD)
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isfdtab[isfd] = NULL;
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}
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