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/*
Unix SMB/CIFS implementation.
some simple double linked list macros
Copyright (C) Andrew Tridgell 1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* To use these macros you must have a structure containing a next and
prev pointer */
/* hook into the front of the list */
#define DLIST_ADD(list, p) \
{ \
if (!(list)) { \
(list) = (p); \
(p)->next = (p)->prev = NULL; \
} else { \
(list)->prev = (p); \
(p)->next = (list); \
(p)->prev = NULL; \
(list) = (p); \
}\
}
/* remove an element from a list - element doesn't have to be in list. */
#define DLIST_REMOVE(list, p) \
{ \
if ((p) == (list)) { \
(list) = (p)->next; \
if (list) (list)->prev = NULL; \
} else { \
if ((p)->prev) (p)->prev->next = (p)->next; \
if ((p)->next) (p)->next->prev = (p)->prev; \
} \
if ((p) != (list)) (p)->next = (p)->prev = NULL; \
}
/* promote an element to the top of the list */
#define DLIST_PROMOTE(list, p) \
{ \
DLIST_REMOVE(list, p) \
DLIST_ADD(list, p) \
}
/* hook into the end of the list - needs a tmp pointer */
#define DLIST_ADD_END(list, p, tmp) \
{ \
if (!(list)) { \
(list) = (p); \
(p)->next = (p)->prev = NULL; \
} else { \
for ((tmp) = (list); (tmp)->next; (tmp) = (tmp)->next) ; \
(tmp)->next = (p); \
(p)->next = NULL; \
(p)->prev = (tmp); \
} \
}
/* insert 'p' after the given element 'el' in a list. If el is NULL then
this is the same as a DLIST_ADD() */
#define DLIST_ADD_AFTER(list, p, el) \
do { \
if (!(list) || !(el)) { \
DLIST_ADD(list, p); \
} else { \
p->prev = el; \
p->next = el->next; \
el->next = p; \
if (p->next) p->next->prev = p; \
}\
} while (0)
/* demote an element to the top of the list, needs a tmp pointer */
#define DLIST_DEMOTE(list, p, tmp) \
{ \
DLIST_REMOVE(list, p) \
DLIST_ADD_END(list, p, tmp) \
}
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