1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
/*
* libmowgli: A collection of useful routines for programming.
* iterator.h: Iterators.
*
* Copyright (c) 2007 William Pitcock <nenolod -at- sacredspiral.co.uk>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __MOWGLI_ITERATOR_H__
#define __MOWGLI_ITERATOR_H__
typedef struct _mowgli_iterator
{
struct _mowgli_iterator *prev, *next;
void *data;
} mowgli_iterator_t;
/* The following are macros which can be used with iterators. */
#define MOWGLI_ITER_FOREACH(n, head) \
for (n = (head); n; n = n->next)
#define MOWGLI_ITER_FOREACH_NEXT(n, head) \
for (n = (head); n->next; n = n->next)
#define MOWGLI_ITER_FOREACH_PREV(n, tail) \
for (n = (tail); n; n = n->prev)
#define MOWGLI_ITER_FOREACH_SAFE(n, tn, head) \
for (n = (head), tn = n ? n->next : NULL; n != NULL; n = tn, tn = n ? n->next : NULL)
#endif
|
