112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)lstForEachFrom.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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/*-
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* lstForEachFrom.c --
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* Perform a given function on all elements of a list starting from
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* a given point.
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*/
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#include "lstInt.h"
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/*-
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*-----------------------------------------------------------------------
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* Lst_ForEachFrom --
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* Apply the given function to each element of the given list. The
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* function should return 0 if traversal should continue and non-
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* zero if it should abort.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* Only those created by the passed-in function.
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*
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*-----------------------------------------------------------------------
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*/
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/*VARARGS2*/
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void
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Lst_ForEachFrom (l, ln, proc, d)
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Lst l;
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LstNode ln;
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register int (*proc)();
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register ClientData d;
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{
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register ListNode tln = (ListNode)ln;
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register List list = (List)l;
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register ListNode next;
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Boolean done;
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int result;
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if (!LstValid (list) || LstIsEmpty (list)) {
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return;
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}
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do {
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/*
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* Take care of having the current element deleted out from under
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* us.
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*/
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next = tln->nextPtr;
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(void) tln->useCount++;
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result = (*proc) (tln->datum, d);
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(void) tln->useCount--;
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/*
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* We're done with the traversal if
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* - nothing's been added after the current node and
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* - the next node to examine is the first in the queue or
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* doesn't exist.
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*/
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done = (next == tln->nextPtr &&
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(next == NilListNode || next == list->firstPtr));
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next = tln->nextPtr;
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if (tln->flags & LN_DELETED) {
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free((char *)tln);
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}
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tln = next;
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} while (!result && !LstIsEmpty(list) && !done);
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}
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