1
/* $NetBSD: lstForEachFrom.c,v 1.7 1997/09/28 03:31:26 lukem Exp $ */
4
* Copyright (c) 1988, 1989, 1990, 1993
5
* The Regents of the University of California. All rights reserved.
7
* This code is derived from software contributed to Berkeley by
10
* Redistribution and use in source and binary forms, with or without
11
* modification, are permitted provided that the following conditions
13
* 1. Redistributions of source code must retain the above copyright
14
* notice, this list of conditions and the following disclaimer.
15
* 2. Redistributions in binary form must reproduce the above copyright
16
* notice, this list of conditions and the following disclaimer in the
17
* documentation and/or other materials provided with the distribution.
18
* 3. All advertising materials mentioning features or use of this software
19
* must display the following acknowledgement:
20
* This product includes software developed by the University of
21
* California, Berkeley and its contributors.
22
* 4. Neither the name of the University nor the names of its contributors
23
* may be used to endorse or promote products derived from this software
24
* without specific prior written permission.
26
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40
static char rcsid[] = "$NetBSD: lstForEachFrom.c,v 1.7 1997/09/28 03:31:26 lukem Exp $";
42
#include <sys/cdefs.h>
45
static char sccsid[] = "@(#)lstForEachFrom.c 8.1 (Berkeley) 6/6/93";
47
__RCSID("$NetBSD: lstForEachFrom.c,v 1.7 1997/09/28 03:31:26 lukem Exp $");
54
* Perform a given function on all elements of a list starting from
61
*-----------------------------------------------------------------------
63
* Apply the given function to each element of the given list. The
64
* function should return 0 if traversal should continue and non-
65
* zero if it should abort.
71
* Only those created by the passed-in function.
73
*-----------------------------------------------------------------------
77
Lst_ForEachFrom (l, ln, proc, d)
80
register int (*proc) __P((ClientData, ClientData));
81
register ClientData d;
83
register ListNode tln = (ListNode)ln;
84
register List list = (List)l;
85
register ListNode next;
89
if (!LstValid (list) || LstIsEmpty (list)) {
95
* Take care of having the current element deleted out from under
101
(void) tln->useCount++;
102
result = (*proc) (tln->datum, d);
103
(void) tln->useCount--;
106
* We're done with the traversal if
107
* - nothing's been added after the current node and
108
* - the next node to examine is the first in the queue or
111
done = (next == tln->nextPtr &&
112
(next == NilListNode || next == list->firstPtr));
116
if (tln->flags & LN_DELETED) {
120
} while (!result && !LstIsEmpty(list) && !done);
added
removed
lst.lib/lstForEachFrom.c
