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/*
* Copyright (c) 2007 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $Sudo: list.h,v 1.3 2007/09/11 19:42:48 millert Exp $
*/
#ifndef _SUDO_LIST_H
#define _SUDO_LIST_H
/*
* Convenience macro for declaring a list head.
*/
#ifdef __STDC__
#define TQ_DECLARE(n) \
struct n##_list { \
struct n *first; \
struct n *last; \
};
#else
#define TQ_DECLARE(n) \
struct n/**/_list { \
struct n *first; \
struct n *last; \
};
#endif
/*
* Foreach loops: forward and reverse
*/
#undef tq_foreach_fwd
#define tq_foreach_fwd(h, v) \
for ((v) = (h)->first; (v) != NULL; (v) = (v)->next)
#undef tq_foreach_rev
#define tq_foreach_rev(h, v) \
for ((v) = (h)->last; (v) != NULL; (v) = (v)->prev)
/*
* Init a list head.
*/
#undef tq_init
#define tq_init(h) do { \
(h)->first = NULL; \
(h)->last = NULL; \
} while (0)
/*
* Simple macros to avoid exposing first/last and prev/next.
*/
#undef tq_empty
#define tq_empty(h) ((h)->first == NULL)
#undef tq_first
#define tq_first(h) ((h)->first)
#undef tq_last
#define tq_last(h) ((h)->last)
#undef list_next
#define list_next(e) ((e)->next)
#undef list_prev
#define list_prev(e) ((e)->prev)
/*
* Prototypes for list.c
*/
void *tq_pop __P((void *));
void tq_append __P((void *, void *));
void list_append __P((void *, void *));
void list2tq __P((void *, void *));
#endif /* _SUDO_LIST_H */
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