X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=mware%2Flist.h;h=c596f1d5b00805a5349cef70c9b8ecf72046a806;hb=2dde5222175bc7b2da7256fc198c51e3a7eb3320;hp=8989728edefa09afec6b3296cbec3568c7f37db3;hpb=37d3acaa622b7f695ce57578e56311d031a22d22;p=bertos.git diff --git a/mware/list.h b/mware/list.h index 8989728e..c596f1d5 100755 --- a/mware/list.h +++ b/mware/list.h @@ -1,8 +1,10 @@ /*! * \file - * Copyright (C) 2001 Bernardo Innocenti - * Copyright (C) 2003 Develer S.r.l. (http://www.develer.com/) - * All Rights Reserved. + * * * \version $Id$ * @@ -11,86 +13,246 @@ * \brief General pourpose double-linked lists */ -/* - * $Log$ - * Revision 1.1 2004/05/23 15:43:16 bernie - * Import mware modules. - * - */ +/*#* + *#* $Log$ + *#* Revision 1.16 2006/01/23 23:10:38 bernie + *#* REVERSE_FOREACH_NODE(): New macro; FOREACHNODE(): Rename to FOREACH_NODE. + *#* + *#* Revision 1.15 2005/11/04 16:20:02 bernie + *#* Fix reference to README.devlib in header. + *#* + *#* Revision 1.14 2005/07/19 07:25:18 bernie + *#* Refactor to remove type aliasing problems. + *#* + *#* Revision 1.13 2005/04/11 19:10:28 bernie + *#* Include top-level headers from cfg/ subdir. + *#* + *#* Revision 1.12 2005/01/22 04:21:32 bernie + *#* Add integrity checks. + *#* + *#* Revision 1.11 2004/12/31 16:44:11 bernie + *#* list_remHead(), list_remTail(): Name like normal functions. + *#* + *#* Revision 1.10 2004/11/28 23:21:05 bernie + *#* Remove obsolete INITLIST macro. + *#* + *#* Revision 1.9 2004/10/21 09:37:55 bernie + *#* Revamp documentation. + *#* + *#* Revision 1.8 2004/10/19 08:46:34 bernie + *#* Fix header. + *#* + *#* Revision 1.7 2004/08/25 14:12:09 rasky + *#* Aggiornato il comment block dei log RCS + *#* + *#* Revision 1.6 2004/07/30 14:34:10 rasky + *#* Vari fix per documentazione e commenti + *#* Aggiunte PP_CATn e STATIC_ASSERT + *#* + *#* Revision 1.5 2004/07/20 23:45:01 bernie + *#* Finally remove redundant protos. + *#* + *#* Revision 1.4 2004/07/18 22:12:53 bernie + *#* Fix warnings with GCC 3.3.2. + *#* + *#* Revision 1.3 2004/07/18 22:01:43 bernie + *#* REMHEAD(), REMTAIL(): Move to list.h as inline functions. + *#* + *#* Revision 1.2 2004/06/03 11:27:09 bernie + *#* Add dual-license information. + *#* + *#* Revision 1.1 2004/05/23 15:43:16 bernie + *#* Import mware modules. + *#* + *#*/ #ifndef MWARE_LIST_H #define MWARE_LIST_H +#include /* INLINE */ +#include /* ASSERT() */ + +/*! + * This structure represents a node for bidirectional lists. + * + * Data is usually appended to nodes by making them the first + * field of another struture, as a poor-man's form of inheritance. + */ typedef struct _Node { struct _Node *succ; struct _Node *pred; } Node; +/*! + * Head of a doubly-linked list of \c Node structs. + * + * Lists must be initialized with LIST_INIT() prior to use. + * + * Nodes can be added and removed from either end of the list + * with O(1) performance. Iterating over these lists can be + * tricky: use the FOREACH_NODE() macro instead. + */ typedef struct _List { - Node *head; - Node *null; - Node *tail; + Node head; + Node tail; } List; -/*! Template for a list of \a T structures */ -#define DECLARE_LIST(T) \ - struct { T *head; T *null; T *tail; } - -/*! Template for a node in a list of \a T structures */ -#define DECLARE_NODE(T) \ - struct { T *succ; T *pred; } - -/*! Template for a node in a list of \a T structures */ +/*! + * Template for a naked node in a list of \a T structures. + * + * To be used as data member in other structures: + * + * \code + * struct Foo + * { + * DECLARE_NODE_ANON(struct Foo) + * int a; + * float b; + * } + * + * DECLARE_LIST_TYPE(Foo); + * + * void foo(void) + * { + * static LIST_TYPE(Foo) foo_list; + * static Foo foo1, foo2; + * Foo *fp; + * + * LIST_INIT(&foo_list); + * ADDHEAD(&foo_list, &foo1); + * INSERTBEFORE(&foo_list, &foo2); + * FOREACH_NODE(fp, &foo_list) + * fp->a = 10; + * } + * + * \endcode + */ #define DECLARE_NODE_ANON(T) \ T *succ; T *pred; +/*! Declare a typesafe node for structures of type \a T. */ +#define DECLARE_NODE_TYPE(T) \ + typedef struct T##Node { T *succ; T *pred; } T##Node + +/*! Template for a list of \a T structures. */ +#define DECLARE_LIST_TYPE(T) \ + DECLARE_NODE_TYPE(T); \ + typedef struct T##List { \ + T##Node head; \ + T##Node tail; \ + } T##List + +#define NODE_TYPE(T) T##Node +#define LIST_TYPE(T) T##List + /*! - * Iterate over all nodes in a list. This statement defines a for cicle - * accepting the following parameters: - * \param n node pointer to be used in each iteration - * \param l pointer to list + * Get a pointer to the first node in a list. + * + * If \a l is empty, result points to l->tail. */ -#define FOREACHNODE(n,l) \ +#define LIST_HEAD(l) ((l)->head.succ) + +/*! + * Get a pointer to the last node in a list. + * + * If \a l is empty, result points to l->head. + */ +#define LIST_TAIL(l) ((l)->tail.pred) + +/*! + * Iterate over all nodes in a list. + * + * This macro generates a "for" statement using the following parameters: + * \param n Node pointer to be used in each iteration. + * \param l Pointer to list. + */ +#define FOREACH_NODE(n, l) \ for( \ - (n) = (typeof(n))((l)->head); \ + (n) = (typeof(n))LIST_HEAD(l); \ ((Node *)(n))->succ; \ (n) = (typeof(n))(((Node *)(n))->succ) \ ) -/*! Initialize a list */ -#define INITLIST(l) \ +#define FOREACHNODE FOREACH_NODE /* OBSOLETE */ + +/*! + * Iterate backwards over all nodes in a list. + * + * This macro generates a "for" statement using the following parameters: + * \param n Node pointer to be used in each iteration. + * \param l Pointer to list. + */ +#define REVERSE_FOREACH_NODE(n, l) \ + for( \ + (n) = (typeof(n))LIST_TAIL(l); \ + ((Node *)(n))->pred; \ + (n) = (typeof(n))(((Node *)(n))->pred) \ + ) + +/*! Initialize a list. */ +#define LIST_INIT(l) \ do { \ - (l)->head = (Node *)(&(l)->null); \ - (l)->null = NULL; \ - (l)->tail = (Node *)(&(l)->head); \ + (l)->head.succ = (typeof((l)->head.succ)) &(l)->tail; \ + (l)->head.pred = NULL; \ + (l)->tail.succ = NULL; \ + (l)->tail.pred = (typeof((l)->tail.pred)) &(l)->head; \ } while (0) -/*! Add node to list head */ +#ifdef _DEBUG + /*! Make sure that a list is valid (it was initialized and is not corrupted). */ + #define LIST_ASSERT_VALID(l) \ + do { \ + Node *n, *pred; \ + ASSERT((l)->head.succ != NULL); \ + ASSERT((l)->head.pred == NULL); \ + ASSERT((l)->tail.succ == NULL); \ + ASSERT((l)->tail.pred != NULL); \ + pred = &(l)->head; \ + FOREACH_NODE(n, l) \ + { \ + ASSERT(n->pred == pred); \ + pred = n; \ + } \ + ASSERT(n == &(l)->tail); \ + } while (0) + + #define INVALIDATE_NODE(n) ((n)->succ = (n)->pred = NULL) +#else + #define LIST_ASSERT_VALID(l) do {} while (0) + #define INVALIDATE_NODE(n) do {} while (0) +#endif + +/*! Add node to list head. */ #define ADDHEAD(l,n) \ do { \ - (n)->succ = (l)->head; \ - (n)->pred = (Node *)&(l)->head; \ + ASSERT(l); \ + ASSERT(n); \ + (n)->succ = (l)->head.succ; \ + (n)->pred = (l)->head.succ->pred; \ (n)->succ->pred = (n); \ - (l)->head = (n); \ + (n)->pred->succ = (n); \ } while (0) -/*! Add node to list tail */ +/*! Add node to list tail. */ #define ADDTAIL(l,n) \ do { \ - (n)->succ = (Node *)(&(l)->null); \ - (n)->pred = (l)->tail; \ + ASSERT(l); \ + ASSERT(n); \ + (n)->succ = &(l)->tail; \ + (n)->pred = (l)->tail.pred; \ (n)->pred->succ = (n); \ - (l)->tail = (n); \ + (l)->tail.pred = (n); \ } while (0) /*! - * Insert node \a n before node \a ln - * Note: you can't pass in a list header as \a ln, but - * it is safe to pass list-\>head of an empty list. + * Insert node \a n before node \a ln. + * + * \note You can't pass in a list header as \a ln, but + * it is safe to pass list-\>head of an empty list. */ -#define INSERTBEFORE(n,ln) \ +#define INSERT_BEFORE(n,ln) \ do { \ (n)->succ = (ln); \ (n)->pred = (ln)->pred; \ @@ -98,25 +260,67 @@ typedef struct _List (ln)->pred = (n); \ } while (0) -/*! Remove \a n from whatever list it is in */ +/*! + * Remove \a n from whatever list it is in. + * + * \note Removing a node that has not previously been + * inserted into a list invokes undefined behavior. + */ #define REMOVE(n) \ do { \ (n)->pred->succ = (n)->succ; \ (n)->succ->pred = (n)->pred; \ + INVALIDATE_NODE(n); \ } while (0) -/*! Tell whether a list is empty */ -#define ISLISTEMPTY(l) ( (l)->head == (Node *)(&(l)->null) ) +/*! Tell whether a list is empty. */ +#define LIST_EMPTY(l) ( (void *)((l)->head.succ) == (void *)(&(l)->tail) ) + +/*! + * Unlink a node from the head of the list \a l. + * + * \return Pointer to node, or NULL if the list was empty. + */ +INLINE Node *list_remHead(List *l) +{ + Node *n; + + if (LIST_EMPTY(l)) + return (Node *)0; + + n = l->head.succ; /* Get first node. */ + l->head.succ = n->succ; /* Link list head to second node. */ + n->succ->pred = &l->head; /* Link second node to list head. */ + + INVALIDATE_NODE(n); + return n; +} + +/*! + * Unlink a node from the tail of the list \a l. + * + * \return Pointer to node, or NULL if the list was empty. + */ +INLINE Node *list_remTail(List *l) +{ + Node *n; + + if (LIST_EMPTY(l)) + return (Node *)0; + + n = l->tail.pred; /* Get last node. */ + l->tail.pred = n->pred; /* Link list tail to second last node. */ + n->pred->succ = &l->tail; /* Link second last node to list tail. */ -/*! \name Extract an element from the head/tail of the list. If the list empty, return NULL. */ -/*\{*/ -#define REMHEAD(l) _list_rem_head(l) -#define REMTAIL(l) _list_rem_tail(l) -/*\}*/ + INVALIDATE_NODE(n); + return n; +} -/* Prototypes for out-of-line functions */ -Node *_list_rem_head(List *l); -Node *_list_rem_tail(List *l); +/* OBSOLETE names */ +#define REMHEAD list_remHead +#define REMTAIL list_remTail +#define INSERTBEFORE INSERT_BEFORE +#define ISLISTEMPTY LIST_EMPTY #endif /* MWARE_LIST_H */