utlist.h
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/*
Copyright (c) 2007-2014, Troy D. Hanson http://troydhanson.github.com/uthash/
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER
OR CONTRIBUTORS 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.
*/
/**
* @defgroup sys_ut utlist
* @ingroup sys
* @brief Basic linked list operation definitions
* @{
*
* @file
* @brief Macros for basic linked list operations
*
* For in-depth documentation see
* http://troydhanson.github.io/uthash/utlist.html
*/
#ifndef UTLIST_H
#define UTLIST_H
/** @brief Version number */
#define UTLIST_VERSION 1.9.9
#include <assert.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* This file contains macros to manipulate singly and doubly-linked lists.
*
* 1. LL_ macros: singly-linked lists.
* 2. DL_ macros: doubly-linked lists.
* 3. CDL_ macros: circular doubly-linked lists.
*
* To use singly-linked lists, your structure must have a "next" pointer.
* To use doubly-linked lists, your structure must "prev" and "next" pointers.
* Either way, the pointer to the head of the list must be initialized to NULL.
*
* ----------------.EXAMPLE -------------------------
* struct item {
* int id;
* struct item *prev, *next;
* }
*
* struct item *list = NULL:
*
* int main() {
* struct item *item;
* ... allocate and populate item ...
* DL_APPEND(list, item);
* }
* --------------------------------------------------
*
* For doubly-linked lists, the append and delete macros are O(1)
* For singly-linked lists, append and delete are O(n) but prepend is O(1)
* The sort macro is O(n log(n)) for all types of single/double/circular lists.
*/
/**
* @name Compiler dependent defines
*
* These macros use decltype or the earlier __typeof GNU extension.
* As decltype is only available in newer compilers (VS2010 or gcc 4.3+
* when compiling c++ code), this code uses whatever method is needed
* or, for VS2008 where neither is available, uses casting workarounds.
*
* For VS2008 we use some workarounds to get around the lack of decltype,
* namely, we always reassign our tmp variable to the list head if we need
* to dereference its prev/next pointers, and save/restore the real head.
* @{
*/
#ifdef _MSC_VER /* MS compiler */
#if _MSC_VER >= 1600 && defined(__cplusplus) /* VS2010 or newer in C++ mode */
#define LDECLTYPE(x) decltype(x)
#else /* VS2008 or older (or VS2010 in C mode) */
#define NO_DECLTYPE
#define LDECLTYPE(x) char*
#endif
#elif defined(__ICCARM__)
#define NO_DECLTYPE
#define LDECLTYPE(x) char*
#else /* GNU, Sun and other compilers */
#define LDECLTYPE(x) __typeof(x)
#endif
#ifdef NO_DECLTYPE
#define _SV(elt,list) _tmp = (char*)(list); {char **_alias = (char**)&(list); *_alias = (elt); }
#define _NEXT(elt,list,next) ((char*)((list)->next))
#define _NEXTASGN(elt,list,to,next) { char **_alias = (char**)&((list)->next); *_alias=(char*)(to); }
/* #define _PREV(elt,list,prev) ((char*)((list)->prev)) */
#define _PREVASGN(elt,list,to,prev) { char **_alias = (char**)&((list)->prev); *_alias=(char*)(to); }
#define _RS(list) { char **_alias = (char**)&(list); *_alias=_tmp; }
#define _CASTASGN(a,b) { char **_alias = (char**)&(a); *_alias=(char*)(b); }
#else
#define _SV(elt,list)
#define _NEXT(elt,list,next) ((elt)->next)
#define _NEXTASGN(elt,list,to,next) ((elt)->next)=(to)
/* #define _PREV(elt,list,prev) ((elt)->prev) */
#define _PREVASGN(elt,list,to,prev) ((elt)->prev)=(to)
#define _RS(list)
#define _CASTASGN(a,b) (a)=(b)
#endif
/** @} */
/**
* @name Mergesort based sort macros
*
* The sort macro is an adaptation of Simon Tatham's O(n log(n)) mergesort
* Unwieldy variable names used here to avoid shadowing passed-in variables.
* @{
*/
#define LL_SORT(list, cmp) \
LL_SORT2(list, cmp, next)
#define LL_SORT2(list, cmp, next) \
do { \
LDECLTYPE(list) _ls_p; \
LDECLTYPE(list) _ls_q; \
LDECLTYPE(list) _ls_e; \
LDECLTYPE(list) _ls_tail; \
int _ls_insize, _ls_nmerges, _ls_psize, _ls_qsize, _ls_i, _ls_looping; \
if (list) { \
_ls_insize = 1; \
_ls_looping = 1; \
while (_ls_looping) { \
_CASTASGN(_ls_p,list); \
list = NULL; \
_ls_tail = NULL; \
_ls_nmerges = 0; \
while (_ls_p) { \
_ls_nmerges++; \
_ls_q = _ls_p; \
_ls_psize = 0; \
for (_ls_i = 0; _ls_i < _ls_insize; _ls_i++) { \
_ls_psize++; \
_SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list,next); _RS(list); \
if (!_ls_q) break; \
} \
_ls_qsize = _ls_insize; \
while (_ls_psize > 0 || (_ls_qsize > 0 && _ls_q)) { \
if (_ls_psize == 0) { \
_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = \
_NEXT(_ls_q,list,next); _RS(list); _ls_qsize--; \
} else if (_ls_qsize == 0 || !_ls_q) { \
_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = \
_NEXT(_ls_p,list,next); _RS(list); _ls_psize--; \
} else if (cmp(_ls_p,_ls_q) <= 0) { \
_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = \
_NEXT(_ls_p,list,next); _RS(list); _ls_psize--; \
} else { \
_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = \
_NEXT(_ls_q,list,next); _RS(list); _ls_qsize--; \
} \
if (_ls_tail) { \
_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_ls_e,next); _RS(list); \
} else { \
_CASTASGN(list,_ls_e); \
} \
_ls_tail = _ls_e; \
} \
_ls_p = _ls_q; \
} \
if (_ls_tail) { \
_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,NULL,next); _RS(list); \
} \
if (_ls_nmerges <= 1) { \
_ls_looping=0; \
} \
_ls_insize *= 2; \
} \
} \
} while (0)
#define DL_SORT(list, cmp) \
DL_SORT2(list, cmp, prev, next)
#define DL_SORT2(list, cmp, prev, next) \
do { \
LDECLTYPE(list) _ls_p; \
LDECLTYPE(list) _ls_q; \
LDECLTYPE(list) _ls_e; \
LDECLTYPE(list) _ls_tail; \
int _ls_insize, _ls_nmerges, _ls_psize, _ls_qsize, _ls_i, _ls_looping; \
if (list) { \
_ls_insize = 1; \
_ls_looping = 1; \
while (_ls_looping) { \
_CASTASGN(_ls_p,list); \
list = NULL; \
_ls_tail = NULL; \
_ls_nmerges = 0; \
while (_ls_p) { \
_ls_nmerges++; \
_ls_q = _ls_p; \
_ls_psize = 0; \
for (_ls_i = 0; _ls_i < _ls_insize; _ls_i++) { \
_ls_psize++; \
_SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list,next); _RS(list); \
if (!_ls_q) break; \
} \
_ls_qsize = _ls_insize; \
while (_ls_psize > 0 || (_ls_qsize > 0 && _ls_q)) { \
if (_ls_psize == 0) { \
_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = \
_NEXT(_ls_q,list,next); _RS(list); _ls_qsize--; \
} else if (_ls_qsize == 0 || !_ls_q) { \
_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = \
_NEXT(_ls_p,list,next); _RS(list); _ls_psize--; \
} else if (cmp(_ls_p,_ls_q) <= 0) { \
_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = \
_NEXT(_ls_p,list,next); _RS(list); _ls_psize--; \
} else { \
_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = \
_NEXT(_ls_q,list,next); _RS(list); _ls_qsize--; \
} \
if (_ls_tail) { \
_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_ls_e,next); _RS(list); \
} else { \
_CASTASGN(list,_ls_e); \
} \
_SV(_ls_e,list); _PREVASGN(_ls_e,list,_ls_tail,prev); _RS(list); \
_ls_tail = _ls_e; \
} \
_ls_p = _ls_q; \
} \
_CASTASGN(list->prev, _ls_tail); \
_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,NULL,next); _RS(list); \
if (_ls_nmerges <= 1) { \
_ls_looping=0; \
} \
_ls_insize *= 2; \
} \
} \
} while (0)
#define CDL_SORT(list, cmp) \
CDL_SORT2(list, cmp, prev, next)
#define CDL_SORT2(list, cmp, prev, next) \
do { \
LDECLTYPE(list) _ls_p; \
LDECLTYPE(list) _ls_q; \
LDECLTYPE(list) _ls_e; \
LDECLTYPE(list) _ls_tail; \
LDECLTYPE(list) _ls_oldhead; \
LDECLTYPE(list) _tmp; \
int _ls_insize, _ls_nmerges, _ls_psize, _ls_qsize, _ls_i, _ls_looping; \
if (list) { \
_ls_insize = 1; \
_ls_looping = 1; \
while (_ls_looping) { \
_CASTASGN(_ls_p,list); \
_CASTASGN(_ls_oldhead,list); \
list = NULL; \
_ls_tail = NULL; \
_ls_nmerges = 0; \
while (_ls_p) { \
_ls_nmerges++; \
_ls_q = _ls_p; \
_ls_psize = 0; \
for (_ls_i = 0; _ls_i < _ls_insize; _ls_i++) { \
_ls_psize++; \
_SV(_ls_q,list); \
if (_NEXT(_ls_q,list,next) == _ls_oldhead) { \
_ls_q = NULL; \
} else { \
_ls_q = _NEXT(_ls_q,list,next); \
} \
_RS(list); \
if (!_ls_q) break; \
} \
_ls_qsize = _ls_insize; \
while (_ls_psize > 0 || (_ls_qsize > 0 && _ls_q)) { \
if (_ls_psize == 0) { \
_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = \
_NEXT(_ls_q,list,next); _RS(list); _ls_qsize--; \
if (_ls_q == _ls_oldhead) { _ls_q = NULL; } \
} else if (_ls_qsize == 0 || !_ls_q) { \
_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = \
_NEXT(_ls_p,list,next); _RS(list); _ls_psize--; \
if (_ls_p == _ls_oldhead) { _ls_p = NULL; } \
} else if (cmp(_ls_p,_ls_q) <= 0) { \
_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = \
_NEXT(_ls_p,list,next); _RS(list); _ls_psize--; \
if (_ls_p == _ls_oldhead) { _ls_p = NULL; } \
} else { \
_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = \
_NEXT(_ls_q,list,next); _RS(list); _ls_qsize--; \
if (_ls_q == _ls_oldhead) { _ls_q = NULL; } \
} \
if (_ls_tail) { \
_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_ls_e,next); _RS(list); \
} else { \
_CASTASGN(list,_ls_e); \
} \
_SV(_ls_e,list); _PREVASGN(_ls_e,list,_ls_tail,prev); _RS(list); \
_ls_tail = _ls_e; \
} \
_ls_p = _ls_q; \
} \
_CASTASGN(list->prev,_ls_tail); \
_CASTASGN(_tmp,list); \
_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_tmp,next); _RS(list); \
if (_ls_nmerges <= 1) { \
_ls_looping=0; \
} \
_ls_insize *= 2; \
} \
} \
} while (0)
/** @} */
/**
* @name Singly linked list macros (non-circular)
* @{
*/
/** @brief LL prepend element 'add' to list */
#define LL_PREPEND(head,add) \
LL_PREPEND2(head,add,next)
/** @brief LL prepend to list with alternative next ptr name 'next' */
#define LL_PREPEND2(head,add,next) \
do { \
(add)->next = head; \
head = add; \
} while (0)
/** @brief LL concat to append second list to first */
#define LL_CONCAT(head1,head2) \
LL_CONCAT2(head1,head2,next)
/** @brief LL concat with alternative next ptr name 'next' */
#define LL_CONCAT2(head1,head2,next) \
do { \
LDECLTYPE(head1) _tmp; \
if (head1) { \
_tmp = head1; \
while (_tmp->next) { _tmp = _tmp->next; } \
_tmp->next=(head2); \
} else { \
(head1)=(head2); \
} \
} while (0)
/** @brief LL append to append element 'add' to list */
#define LL_APPEND(head,add) \
LL_APPEND2(head,add,next)
/** @brief LL append with alternative next ptr name 'next' */
#define LL_APPEND2(head,add,next) \
do { \
LDECLTYPE(head) _tmp; \
(add)->next=NULL; \
if (head) { \
_tmp = head; \
while (_tmp->next) { _tmp = _tmp->next; } \
_tmp->next=(add); \
} else { \
(head)=(add); \
} \
} while (0)
/** @brief LL delete element 'del' from list */
#define LL_DELETE(head,del) \
LL_DELETE2(head,del,next)
/** @brief LL delete with alternative next ptr name 'name' */
#define LL_DELETE2(head,del,next) \
do { \
LDECLTYPE(head) _tmp; \
if ((head) == (del)) { \
(head)=(head)->next; \
} else { \
_tmp = head; \
while (_tmp->next && (_tmp->next != (del))) { \
_tmp = _tmp->next; \
} \
if (_tmp->next) { \
_tmp->next = ((del)->next); \
} \
} \
} while (0)
/* Here are VS2008 replacements for LL_APPEND and LL_DELETE */
#define LL_APPEND_VS2008(head,add) \
LL_APPEND2_VS2008(head,add,next)
#define LL_APPEND2_VS2008(head,add,next) \
do { \
if (head) { \
(add)->next = head; /* use add->next as a temp variable */ \
while ((add)->next->next) { (add)->next = (add)->next->next; } \
(add)->next->next=(add); \
} else { \
(head)=(add); \
} \
(add)->next=NULL; \
} while (0)
#define LL_DELETE_VS2008(head,del) \
LL_DELETE2_VS2008(head,del,next)
#define LL_DELETE2_VS2008(head,del,next) \
do { \
if ((head) == (del)) { \
(head)=(head)->next; \
} else { \
char *_tmp = (char*)(head); \
while ((head)->next && ((head)->next != (del))) { \
head = (head)->next; \
} \
if ((head)->next) { \
(head)->next = ((del)->next); \
} \
{ \
char **_head_alias = (char**)&(head); \
*_head_alias = _tmp; \
} \
} \
} while (0)
#ifdef NO_DECLTYPE
#undef LL_APPEND
#define LL_APPEND LL_APPEND_VS2008
#undef LL_DELETE
#define LL_DELETE LL_DELETE_VS2008
#undef LL_DELETE2
#define LL_DELETE2 LL_DELETE2_VS2008
#undef LL_APPEND2
#define LL_APPEND2 LL_APPEND2_VS2008
#undef LL_CONCAT /* no LL_CONCAT_VS2008 */
#undef DL_CONCAT /* no DL_CONCAT_VS2008 */
#endif
/* end VS2008 replacements */
/** @brief LL count list elements using 'counter' */
#define LL_COUNT(head,el,counter) \
LL_COUNT2(head,el,counter,next) \
/** @brief LL count with alternative next ptr name 'next' */
#define LL_COUNT2(head,el,counter,next) \
{ \
counter = 0; \
LL_FOREACH2(head,el,next){ ++counter; } \
}
/** @brief LL list iteration */
#define LL_FOREACH(head,el) \
LL_FOREACH2(head,el,next)
/** @brief LL list iteration with alternative next ptr name 'next' */
#define LL_FOREACH2(head,el,next) \
for(el=head;el;el=(el)->next)
/**
* @brief LL safe list iteration
* Use if list elements might be deleted while iterating
*/
#define LL_FOREACH_SAFE(head,el,tmp) \
LL_FOREACH_SAFE2(head,el,tmp,next)
/** @brief LL safe list iteration with alternative ptr names */
#define LL_FOREACH_SAFE2(head,el,tmp,next) \
for((el)=(head);(el) && (tmp = (el)->next, 1); (el) = tmp)
/** @brief LL scalar search for element with value 'val' for member 'field' */
#define LL_SEARCH_SCALAR(head,out,field,val) \
LL_SEARCH_SCALAR2(head,out,field,val,next)
/** @brief LL scalar search with alternative next ptr name 'next' */
#define LL_SEARCH_SCALAR2(head,out,field,val,next) \
do { \
LL_FOREACH2(head,out,next) { \
if ((out)->field == (val)) break; \
} \
} while(0)
/** @brief LL search element 'elt' in list using function 'cmp' */
#define LL_SEARCH(head,out,elt,cmp) \
LL_SEARCH2(head,out,elt,cmp,next)
/** @brief LL search with alternative next ptr name 'next' */
#define LL_SEARCH2(head,out,elt,cmp,next) \
do { \
LL_FOREACH2(head,out,next) { \
if ((cmp(out,elt))==0) break; \
} \
} while(0)
/** @brief LL replace element 'el' with element 'add' in list */
#define LL_REPLACE_ELEM(head, el, add) \
do { \
LDECLTYPE(head) _tmp; \
assert(head != NULL); \
assert(el != NULL); \
assert(add != NULL); \
(add)->next = (el)->next; \
if ((head) == (el)) { \
(head) = (add); \
} else { \
_tmp = head; \
while (_tmp->next && (_tmp->next != (el))) { \
_tmp = _tmp->next; \
} \
if (_tmp->next) { \
_tmp->next = (add); \
} \
} \
} while (0)
/** @brief LL prepend new element 'add' to element 'el' in list */
#define LL_PREPEND_ELEM(head, el, add) \
do { \
LDECLTYPE(head) _tmp; \
assert(head != NULL); \
assert(el != NULL); \
assert(add != NULL); \
(add)->next = (el); \
if ((head) == (el)) { \
(head) = (add); \
} else { \
_tmp = head; \
while (_tmp->next && (_tmp->next != (el))) { \
_tmp = _tmp->next; \
} \
if (_tmp->next) { \
_tmp->next = (add); \
} \
} \
} while (0)
/** @} */
/**
* @name Doubly linked list macros (non-circular)
* @{
*/
/** @brief DL prepend element 'add' to list */
#define DL_PREPEND(head,add) \
DL_PREPEND2(head,add,prev,next)
/** @brief DL prepend to list with alternative ptr names */
#define DL_PREPEND2(head,add,prev,next) \
do { \
(add)->next = head; \
if (head) { \
(add)->prev = (head)->prev; \
(head)->prev = (add); \
} else { \
(add)->prev = (add); \
} \
(head) = (add); \
} while (0)
/** @brief DL append to append element 'add' to list */
#define DL_APPEND(head,add) \
DL_APPEND2(head,add,prev,next)
/** @brief DL append with alternative next ptr name 'next' */
#define DL_APPEND2(head,add,prev,next) \
do { \
if (head) { \
(add)->prev = (head)->prev; \
(head)->prev->next = (add); \
(head)->prev = (add); \
(add)->next = NULL; \
} else { \
(head)=(add); \
(head)->prev = (head); \
(head)->next = NULL; \
} \
} while (0)
/** @brief DL concat to append second list to first */
#define DL_CONCAT(head1,head2) \
DL_CONCAT2(head1,head2,prev,next)
/** @brief DL concat with alternative next ptr name 'next' */
#define DL_CONCAT2(head1,head2,prev,next) \
do { \
LDECLTYPE(head1) _tmp; \
if (head2) { \
if (head1) { \
_tmp = (head2)->prev; \
(head2)->prev = (head1)->prev; \
(head1)->prev->next = (head2); \
(head1)->prev = _tmp; \
} else { \
(head1)=(head2); \
} \
} \
} while (0)
/** @brief DL delete element 'del' from list */
#define DL_DELETE(head,del) \
DL_DELETE2(head,del,prev,next)
/** @brief DL delete with alternative ptr names */
#define DL_DELETE2(head,del,prev,next) \
do { \
assert((del)->prev != NULL); \
if ((del)->prev == (del)) { \
(head)=NULL; \
} else if ((del)==(head)) { \
(del)->next->prev = (del)->prev; \
(head) = (del)->next; \
} else { \
(del)->prev->next = (del)->next; \
if ((del)->next) { \
(del)->next->prev = (del)->prev; \
} else { \
(head)->prev = (del)->prev; \
} \
} \
} while (0)
/** @brief DL count list elements using 'counter' */
#define DL_COUNT(head,el,counter) \
DL_COUNT2(head,el,counter,next) \
/** @brief DL count with alternative next ptr name 'next' */
#define DL_COUNT2(head,el,counter,next) \
{ \
counter = 0; \
DL_FOREACH2(head,el,next){ ++counter; } \
}
/** @brief DL list iteration */
#define DL_FOREACH(head,el) \
DL_FOREACH2(head,el,next)
/** @brief DL list iteration with alternative next ptr name 'next' */
#define DL_FOREACH2(head,el,next) \
for(el=head;el;el=(el)->next)
/**
* @brief DL safe list iteration
* Use if list elements might be deleted while iterating
*/
#define DL_FOREACH_SAFE(head,el,tmp) \
DL_FOREACH_SAFE2(head,el,tmp,next)
/** @brief DL safe list iteration with alternative ptr names */
#define DL_FOREACH_SAFE2(head,el,tmp,next) \
for((el)=(head);(el) && (tmp = (el)->next, 1); (el) = tmp)
/**
* @brief DL scalar search for element with value 'val' for member 'field'
* Identical to singly-linked counterpart
*/
#define DL_SEARCH_SCALAR LL_SEARCH_SCALAR
/**
* @brief DL scalar search with alternative next ptr name 'next'
* Identical to singly-linked counterpart
*/
#define DL_SEARCH_SCALAR2 LL_SEARCH_SCALAR2
/**
* @brief DL search element 'elt' in list using function 'cmp'
* Identical to singly-linked counterpart
*/
#define DL_SEARCH LL_SEARCH
/**
* @brief DL search with alternative next ptr name 'next'
* Identical to singly-linked counterpart
*/
#define DL_SEARCH2 LL_SEARCH2
/** @brief DL replace element 'el' with element 'add' in list */
#define DL_REPLACE_ELEM(head, el, add) \
do { \
assert(head != NULL); \
assert(el != NULL); \
assert(add != NULL); \
if ((head) == (el)) { \
(head) = (add); \
(add)->next = (el)->next; \
if ((el)->next == NULL) { \
(add)->prev = (add); \
} else { \
(add)->prev = (el)->prev; \
(add)->next->prev = (add); \
} \
} else { \
(add)->next = (el)->next; \
(add)->prev = (el)->prev; \
(add)->prev->next = (add); \
if ((el)->next == NULL) { \
(head)->prev = (add); \
} else { \
(add)->next->prev = (add); \
} \
} \
} while (0)
/** @brief DL prepend new element 'add' to element 'el' in list */
#define DL_PREPEND_ELEM(head, el, add) \
do { \
assert(head != NULL); \
assert(el != NULL); \
assert(add != NULL); \
(add)->next = (el); \
(add)->prev = (el)->prev; \
(el)->prev = (add); \
if ((head) == (el)) { \
(head) = (add); \
} else { \
(add)->prev->next = (add); \
} \
} while (0)
/** @} */
/**
* @name Circular doubly linked list macros
* @{
*/
/** @brief CDL prepend element 'add' to list */
#define CDL_PREPEND(head,add) \
CDL_PREPEND2(head,add,prev,next)
/** @brief CDL prepend to list with alternative ptr names */
#define CDL_PREPEND2(head,add,prev,next) \
do { \
if (head) { \
(add)->prev = (head)->prev; \
(add)->next = (head); \
(head)->prev = (add); \
(add)->prev->next = (add); \
} else { \
(add)->prev = (add); \
(add)->next = (add); \
} \
(head)=(add); \
} while (0)
/** @brief CDL delete element 'del' from list */
#define CDL_DELETE(head,del) \
CDL_DELETE2(head,del,prev,next)
/** @brief CDL delete with alternative ptr names */
#define CDL_DELETE2(head,del,prev,next) \
do { \
if ( ((head)==(del)) && ((head)->next == (head))) { \
(head) = 0L; \
} else { \
(del)->next->prev = (del)->prev; \
(del)->prev->next = (del)->next; \
if ((del) == (head)) (head)=(del)->next; \
} \
} while (0)
/** @brief CDL count list elements using 'counter' */
#define CDL_COUNT(head,el,counter) \
CDL_COUNT2(head,el,counter,next) \
/** @brief CDL count with alternative next ptr name 'next' */
#define CDL_COUNT2(head, el, counter,next) \
{ \
counter = 0; \
CDL_FOREACH2(head,el,next){ ++counter; } \
}
/** @brief CDL list iteration */
#define CDL_FOREACH(head,el) \
CDL_FOREACH2(head,el,next)
/** @brief CDL list iteration with alternative next ptr name 'next' */
#define CDL_FOREACH2(head,el,next) \
for(el=head;el;el=((el)->next==head ? 0L : (el)->next))
/**
* @brief CDL safe list iteration
* Use if list elements might be deleted while iterating
*/
#define CDL_FOREACH_SAFE(head,el,tmp1,tmp2) \
CDL_FOREACH_SAFE2(head,el,tmp1,tmp2,prev,next)
/** @brief CDL safe list iteration with alternative ptr names */
#define CDL_FOREACH_SAFE2(head,el,tmp1,tmp2,prev,next) \
for((el)=(head), ((tmp1)=(head)?((head)->prev):NULL); \
(el) && ((tmp2)=(el)->next, 1); \
((el) = (((el)==(tmp1)) ? 0L : (tmp2))))
/** @brief CDL scalar search for element with value 'val' for member 'field' */
#define CDL_SEARCH_SCALAR(head,out,field,val) \
CDL_SEARCH_SCALAR2(head,out,field,val,next)
/** @brief CDL scalar search with alternative next ptr name 'next' */
#define CDL_SEARCH_SCALAR2(head,out,field,val,next) \
do { \
CDL_FOREACH2(head,out,next) { \
if ((out)->field == (val)) break; \
} \
} while(0)
/** @brief CDL search element 'elt' in list using function 'cmp' */
#define CDL_SEARCH(head,out,elt,cmp) \
CDL_SEARCH2(head,out,elt,cmp,next)
/** @brief CDL search with alternative next ptr name 'next' */
#define CDL_SEARCH2(head,out,elt,cmp,next) \
do { \
CDL_FOREACH2(head,out,next) { \
if ((cmp(out,elt))==0) break; \
} \
} while(0)
/** @brief CDL replace element 'el' with element 'add' in list */
#define CDL_REPLACE_ELEM(head, el, add) \
do { \
assert(head != NULL); \
assert(el != NULL); \
assert(add != NULL); \
if ((el)->next == (el)) { \
(add)->next = (add); \
(add)->prev = (add); \
(head) = (add); \
} else { \
(add)->next = (el)->next; \
(add)->prev = (el)->prev; \
(add)->next->prev = (add); \
(add)->prev->next = (add); \
if ((head) == (el)) { \
(head) = (add); \
} \
} \
} while (0)
/** @brief CDL prepend new element 'add' to element 'el' in list */
#define CDL_PREPEND_ELEM(head, el, add) \
do { \
assert(head != NULL); \
assert(el != NULL); \
assert(add != NULL); \
(add)->next = (el); \
(add)->prev = (el)->prev; \
(el)->prev = (add); \
(add)->prev->next = (add); \
if ((head) == (el)) { \
(head) = (add); \
} \
} while (0)
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* UTLIST_H */
/** @} */