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-/*
-Copyright (c) 2007-2012, Troy D. Hanson http://uthash.sourceforge.net
-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.
-*/
-
-#ifndef UTLIST_H
-#define UTLIST_H
-
-#define UTLIST_VERSION 1.9.6
-
-#include <assert.h>
-
-/*
- * 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.
- */
-
-/* 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. */
-#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
-#else /* GNU, Sun and other compilers */
-#define LDECLTYPE(x) __typeof(x)
-#endif
-
-/* 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 NO_DECLTYPE
-#define _SV(elt,list) _tmp = (char*)(list); {char **_alias = (char**)&(list); *_alias = (elt); }
-#define _NEXT(elt,list) ((char*)((list)->next))
-#define _NEXTASGN(elt,list,to) { char **_alias = (char**)&((list)->next); *_alias=(char*)(to); }
-#define _PREV(elt,list) ((char*)((list)->prev))
-#define _PREVASGN(elt,list,to) { 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) ((elt)->next)
-#define _NEXTASGN(elt,list,to) ((elt)->next)=(to)
-#define _PREV(elt,list) ((elt)->prev)
-#define _PREVASGN(elt,list,to) ((elt)->prev)=(to)
-#define _RS(list)
-#define _CASTASGN(a,b) (a)=(b)
-#endif
-
-/******************************************************************************
- * 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) \
-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); _ls_q = _NEXT(_ls_q,list); _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); _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); _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); _RS(list); _ls_psize--; \
- } else { \
- _ls_e = _ls_q; _SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); _ls_qsize--; \
- } \
- if (_ls_tail) { \
- _SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_ls_e); _RS(list); \
- } else { \
- _CASTASGN(list,_ls_e); \
- } \
- _ls_tail = _ls_e; \
- } \
- _ls_p = _ls_q; \
- } \
- _SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,NULL); _RS(list); \
- if (_ls_nmerges <= 1) { \
- _ls_looping=0; \
- } \
- _ls_insize *= 2; \
- } \
- } else _tmp=NULL; /* quiet gcc unused variable warning */ \
-} while (0)
-
-#define DL_SORT(list, cmp) \
-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); _ls_q = _NEXT(_ls_q,list); _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); _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); _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); _RS(list); _ls_psize--; \
- } else { \
- _ls_e = _ls_q; _SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); _ls_qsize--; \
- } \
- if (_ls_tail) { \
- _SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_ls_e); _RS(list); \
- } else { \
- _CASTASGN(list,_ls_e); \
- } \
- _SV(_ls_e,list); _PREVASGN(_ls_e,list,_ls_tail); _RS(list); \
- _ls_tail = _ls_e; \
- } \
- _ls_p = _ls_q; \
- } \
- _CASTASGN(list->prev, _ls_tail); \
- _SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,NULL); _RS(list); \
- if (_ls_nmerges <= 1) { \
- _ls_looping=0; \
- } \
- _ls_insize *= 2; \
- } \
- } else _tmp=NULL; /* quiet gcc unused variable warning */ \
-} while (0)
-
-#define CDL_SORT(list, cmp) \
-do { \
- LDECLTYPE(list) _ls_p; \
- LDECLTYPE(list) _ls_q; \
- LDECLTYPE(list) _ls_e; \
- LDECLTYPE(list) _ls_tail; \
- LDECLTYPE(list) _ls_oldhead; \
- LDECLTYPE(list) _tmp; \
- LDECLTYPE(list) _tmp2; \
- 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) == _ls_oldhead) { \
- _ls_q = NULL; \
- } else { \
- _ls_q = _NEXT(_ls_q,list); \
- } \
- _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); _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); _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); _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); _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); _RS(list); \
- } else { \
- _CASTASGN(list,_ls_e); \
- } \
- _SV(_ls_e,list); _PREVASGN(_ls_e,list,_ls_tail); _RS(list); \
- _ls_tail = _ls_e; \
- } \
- _ls_p = _ls_q; \
- } \
- _CASTASGN(list->prev,_ls_tail); \
- _CASTASGN(_tmp2,list); \
- _SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_tmp2); _RS(list); \
- if (_ls_nmerges <= 1) { \
- _ls_looping=0; \
- } \
- _ls_insize *= 2; \
- } \
- } else _tmp=NULL; /* quiet gcc unused variable warning */ \
-} while (0)
-
-/******************************************************************************
- * singly linked list macros (non-circular) *
- *****************************************************************************/
-#define LL_PREPEND(head,add) \
-do { \
- (add)->next = head; \
- head = add; \
-} while (0)
-
-#define LL_CONCAT(head1,head2) \
-do { \
- LDECLTYPE(head1) _tmp; \
- if (head1) { \
- _tmp = head1; \
- while (_tmp->next) { _tmp = _tmp->next; } \
- _tmp->next=(head2); \
- } else { \
- (head1)=(head2); \
- } \
-} while (0)
-
-#define LL_APPEND(head,add) \
-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)
-
-#define LL_DELETE(head,del) \
-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) \
-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) \
-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_CONCAT /* no LL_CONCAT_VS2008 */
-#undef DL_CONCAT /* no DL_CONCAT_VS2008 */
-#endif
-/* end VS2008 replacements */
-
-#define LL_FOREACH(head,el) \
- for(el=head;el;el=(el)->next)
-
-#define LL_FOREACH_SAFE(head,el,tmp) \
- for((el)=(head);(el) && (tmp = (el)->next, 1); (el) = tmp)
-
-#define LL_SEARCH_SCALAR(head,out,field,val) \
-do { \
- LL_FOREACH(head,out) { \
- if ((out)->field == (val)) break; \
- } \
-} while(0)
-
-#define LL_SEARCH(head,out,elt,cmp) \
-do { \
- LL_FOREACH(head,out) { \
- if ((cmp(out,elt))==0) break; \
- } \
-} while(0)
-
-/******************************************************************************
- * doubly linked list macros (non-circular) *
- *****************************************************************************/
-#define DL_PREPEND(head,add) \
-do { \
- (add)->next = head; \
- if (head) { \
- (add)->prev = (head)->prev; \
- (head)->prev = (add); \
- } else { \
- (add)->prev = (add); \
- } \
- (head) = (add); \
-} while (0)
-
-#define DL_APPEND(head,add) \
-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)
-
-#define DL_CONCAT(head1,head2) \
-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)
-
-#define DL_DELETE(head,del) \
-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)
-
-
-#define DL_FOREACH(head,el) \
- for(el=head;el;el=(el)->next)
-
-/* this version is safe for deleting the elements during iteration */
-#define DL_FOREACH_SAFE(head,el,tmp) \
- for((el)=(head);(el) && (tmp = (el)->next, 1); (el) = tmp)
-
-/* these are identical to their singly-linked list counterparts */
-#define DL_SEARCH_SCALAR LL_SEARCH_SCALAR
-#define DL_SEARCH LL_SEARCH
-
-/******************************************************************************
- * circular doubly linked list macros *
- *****************************************************************************/
-#define CDL_PREPEND(head,add) \
-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)
-
-#define CDL_DELETE(head,del) \
-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)
-
-#define CDL_FOREACH(head,el) \
- for(el=head;el;el=((el)->next==head ? 0L : (el)->next))
-
-#define CDL_FOREACH_SAFE(head,el,tmp1,tmp2) \
- for((el)=(head), ((tmp1)=(head)?((head)->prev):NULL); \
- (el) && ((tmp2)=(el)->next, 1); \
- ((el) = (((el)==(tmp1)) ? 0L : (tmp2))))
-
-#define CDL_SEARCH_SCALAR(head,out,field,val) \
-do { \
- CDL_FOREACH(head,out) { \
- if ((out)->field == (val)) break; \
- } \
-} while(0)
-
-#define CDL_SEARCH(head,out,elt,cmp) \
-do { \
- CDL_FOREACH(head,out) { \
- if ((cmp(out,elt))==0) break; \
- } \
-} while(0)
-
-#endif /* UTLIST_H */
-
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