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490 lines
36 KiB
C
490 lines
36 KiB
C
/*
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Copyright (c) 2007-2010, Troy D. Hanson http://uthash.sourceforge.net
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef UTLIST_H
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#define UTLIST_H
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#define UTLIST_VERSION 1.9.1
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/*
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* This file contains macros to manipulate singly and doubly-linked lists.
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*
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* 1. LL_ macros: singly-linked lists.
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* 2. DL_ macros: doubly-linked lists.
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* 3. CDL_ macros: circular doubly-linked lists.
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*
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* To use singly-linked lists, your structure must have a "next" pointer.
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* To use doubly-linked lists, your structure must "prev" and "next" pointers.
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* Either way, the pointer to the head of the list must be initialized to NULL.
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*
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* ----------------.EXAMPLE -------------------------
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* struct item {
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* int id;
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* struct item *prev, *next;
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* }
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*
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* struct item *list = NULL:
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*
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* int main() {
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* struct item *item;
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* ... allocate and populate item ...
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* DL_APPEND(list, item);
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* }
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* --------------------------------------------------
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*
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* For doubly-linked lists, the append and delete macros are O(1)
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* For singly-linked lists, append and delete are O(n) but prepend is O(1)
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* The sort macro is O(n log(n)) for all types of single/double/circular lists.
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*/
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/* These macros use decltype or the earlier __typeof GNU extension.
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As decltype is only available in newer compilers (VS2010 or gcc 4.3+
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when compiling c++ code), this code uses whatever method is needed
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or, for VS2008 where neither is available, uses casting workarounds. */
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#ifdef _MSC_VER /* MS compiler */
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#if _MSC_VER >= 1600 && __cplusplus /* VS2010 and newer in C++ mode */
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#define LDECLTYPE(x) decltype(x)
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#else /* VS2008 or older (or VS2010 in C mode) */
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#define NO_DECLTYPE
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#define LDECLTYPE(x) char*
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#endif
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#else /* GNU, Sun and other compilers */
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#define LDECLTYPE(x) __typeof(x)
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#endif
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/* for VS2008 we use some workarounds to get around the lack of decltype,
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* namely, we always reassign our tmp variable to the list head if we need
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* to dereference its prev/next pointers, and save/restore the real head.*/
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#ifdef NO_DECLTYPE
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#define _SV(elt,list) _tmp = (char*)(list); {char **_alias = (char**)&(list); *_alias = (elt); }
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#define _NEXT(elt,list) ((char*)((list)->next))
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#define _NEXTASGN(elt,list,to) { char **_alias = (char**)&((list)->next); *_alias=(char*)(to); }
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#define _PREV(elt,list) ((char*)((list)->prev))
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#define _PREVASGN(elt,list,to) { char **_alias = (char**)&((list)->prev); *_alias=(char*)(to); }
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#define _RS(list) { char **_alias = (char**)&(list); *_alias=_tmp; }
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#define _CASTASGN(a,b) { char **_alias = (char**)&(a); *_alias=(char*)(b); }
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#else
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#define _SV(elt,list)
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#define _NEXT(elt,list) ((elt)->next)
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#define _NEXTASGN(elt,list,to) ((elt)->next)=(to)
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#define _PREV(elt,list) ((elt)->prev)
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#define _PREVASGN(elt,list,to) ((elt)->prev)=(to)
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#define _RS(list)
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#define _CASTASGN(a,b) (a)=(b)
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#endif
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/******************************************************************************
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* The sort macro is an adaptation of Simon Tatham's O(n log(n)) mergesort *
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* Unwieldy variable names used here to avoid shadowing passed-in variables. *
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*****************************************************************************/
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#define LL_SORT(list, cmp) \
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do { \
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LDECLTYPE(list) _ls_p; \
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LDECLTYPE(list) _ls_q; \
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LDECLTYPE(list) _ls_e; \
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LDECLTYPE(list) _ls_tail; \
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LDECLTYPE(list) _ls_oldhead; \
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LDECLTYPE(list) _tmp; \
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int _ls_insize, _ls_nmerges, _ls_psize, _ls_qsize, _ls_i, _ls_looping; \
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if (list) { \
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_ls_insize = 1; \
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_ls_looping = 1; \
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while (_ls_looping) { \
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_CASTASGN(_ls_p,list); \
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_CASTASGN(_ls_oldhead,list); \
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list = NULL; \
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_ls_tail = NULL; \
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_ls_nmerges = 0; \
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while (_ls_p) { \
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_ls_nmerges++; \
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_ls_q = _ls_p; \
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_ls_psize = 0; \
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for (_ls_i = 0; _ls_i < _ls_insize; _ls_i++) { \
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_ls_psize++; \
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_SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); \
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if (!_ls_q) break; \
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} \
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_ls_qsize = _ls_insize; \
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while (_ls_psize > 0 || (_ls_qsize > 0 && _ls_q)) { \
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if (_ls_psize == 0) { \
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_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); _ls_qsize--; \
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} else if (_ls_qsize == 0 || !_ls_q) { \
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_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = _NEXT(_ls_p,list); _RS(list); _ls_psize--; \
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} else if (cmp(_ls_p,_ls_q) <= 0) { \
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_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = _NEXT(_ls_p,list); _RS(list); _ls_psize--; \
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} else { \
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_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); _ls_qsize--; \
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} \
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if (_ls_tail) { \
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_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_ls_e); _RS(list); \
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} else { \
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_CASTASGN(list,_ls_e); \
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} \
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_ls_tail = _ls_e; \
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} \
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_ls_p = _ls_q; \
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} \
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_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,NULL); _RS(list); \
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if (_ls_nmerges <= 1) { \
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_ls_looping=0; \
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} \
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_ls_insize *= 2; \
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} \
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} else _tmp=NULL; /* quiet gcc unused variable warning */ \
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} while (0)
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#define DL_SORT(list, cmp) \
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do { \
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LDECLTYPE(list) _ls_p; \
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LDECLTYPE(list) _ls_q; \
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LDECLTYPE(list) _ls_e; \
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LDECLTYPE(list) _ls_tail; \
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LDECLTYPE(list) _ls_oldhead; \
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LDECLTYPE(list) _tmp; \
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int _ls_insize, _ls_nmerges, _ls_psize, _ls_qsize, _ls_i, _ls_looping; \
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if (list) { \
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_ls_insize = 1; \
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_ls_looping = 1; \
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while (_ls_looping) { \
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_CASTASGN(_ls_p,list); \
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_CASTASGN(_ls_oldhead,list); \
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list = NULL; \
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_ls_tail = NULL; \
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_ls_nmerges = 0; \
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while (_ls_p) { \
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_ls_nmerges++; \
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_ls_q = _ls_p; \
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_ls_psize = 0; \
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for (_ls_i = 0; _ls_i < _ls_insize; _ls_i++) { \
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_ls_psize++; \
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_SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); \
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if (!_ls_q) break; \
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} \
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_ls_qsize = _ls_insize; \
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while (_ls_psize > 0 || (_ls_qsize > 0 && _ls_q)) { \
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if (_ls_psize == 0) { \
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_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); _ls_qsize--; \
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} else if (_ls_qsize == 0 || !_ls_q) { \
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_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = _NEXT(_ls_p,list); _RS(list); _ls_psize--; \
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} else if (cmp(_ls_p,_ls_q) <= 0) { \
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_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = _NEXT(_ls_p,list); _RS(list); _ls_psize--; \
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} else { \
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_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); _ls_qsize--; \
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} \
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if (_ls_tail) { \
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_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_ls_e); _RS(list); \
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} else { \
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_CASTASGN(list,_ls_e); \
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} \
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_SV(_ls_e,list); _PREVASGN(_ls_e,list,_ls_tail); _RS(list); \
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_ls_tail = _ls_e; \
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} \
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_ls_p = _ls_q; \
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} \
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_CASTASGN(list->prev, _ls_tail); \
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_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,NULL); _RS(list); \
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if (_ls_nmerges <= 1) { \
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_ls_looping=0; \
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} \
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_ls_insize *= 2; \
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} \
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} else _tmp=NULL; /* quiet gcc unused variable warning */ \
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} while (0)
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#define CDL_SORT(list, cmp) \
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do { \
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LDECLTYPE(list) _ls_p; \
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LDECLTYPE(list) _ls_q; \
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LDECLTYPE(list) _ls_e; \
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LDECLTYPE(list) _ls_tail; \
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LDECLTYPE(list) _ls_oldhead; \
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LDECLTYPE(list) _tmp; \
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LDECLTYPE(list) _tmp2; \
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int _ls_insize, _ls_nmerges, _ls_psize, _ls_qsize, _ls_i, _ls_looping; \
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if (list) { \
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_ls_insize = 1; \
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_ls_looping = 1; \
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while (_ls_looping) { \
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_CASTASGN(_ls_p,list); \
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_CASTASGN(_ls_oldhead,list); \
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list = NULL; \
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_ls_tail = NULL; \
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_ls_nmerges = 0; \
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while (_ls_p) { \
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_ls_nmerges++; \
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_ls_q = _ls_p; \
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_ls_psize = 0; \
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for (_ls_i = 0; _ls_i < _ls_insize; _ls_i++) { \
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_ls_psize++; \
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_SV(_ls_q,list); \
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if (_NEXT(_ls_q,list) == _ls_oldhead) { \
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_ls_q = NULL; \
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} else { \
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_ls_q = _NEXT(_ls_q,list); \
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} \
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_RS(list); \
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if (!_ls_q) break; \
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} \
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_ls_qsize = _ls_insize; \
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while (_ls_psize > 0 || (_ls_qsize > 0 && _ls_q)) { \
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if (_ls_psize == 0) { \
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_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); _ls_qsize--; \
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if (_ls_q == _ls_oldhead) { _ls_q = NULL; } \
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} else if (_ls_qsize == 0 || !_ls_q) { \
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_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = _NEXT(_ls_p,list); _RS(list); _ls_psize--; \
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if (_ls_p == _ls_oldhead) { _ls_p = NULL; } \
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} else if (cmp(_ls_p,_ls_q) <= 0) { \
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_ls_e = _ls_p; _SV(_ls_p,list); _ls_p = _NEXT(_ls_p,list); _RS(list); _ls_psize--; \
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if (_ls_p == _ls_oldhead) { _ls_p = NULL; } \
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} else { \
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_ls_e = _ls_q; _SV(_ls_q,list); _ls_q = _NEXT(_ls_q,list); _RS(list); _ls_qsize--; \
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if (_ls_q == _ls_oldhead) { _ls_q = NULL; } \
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} \
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if (_ls_tail) { \
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_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_ls_e); _RS(list); \
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} else { \
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_CASTASGN(list,_ls_e); \
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} \
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_SV(_ls_e,list); _PREVASGN(_ls_e,list,_ls_tail); _RS(list); \
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_ls_tail = _ls_e; \
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} \
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_ls_p = _ls_q; \
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} \
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_CASTASGN(list->prev,_ls_tail); \
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_CASTASGN(_tmp2,list); \
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_SV(_ls_tail,list); _NEXTASGN(_ls_tail,list,_tmp2); _RS(list); \
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if (_ls_nmerges <= 1) { \
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_ls_looping=0; \
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} \
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_ls_insize *= 2; \
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} \
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} else _tmp=NULL; /* quiet gcc unused variable warning */ \
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} while (0)
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/******************************************************************************
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* singly linked list macros (non-circular) *
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*****************************************************************************/
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#define LL_PREPEND(head,add) \
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do { \
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(add)->next = head; \
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head = add; \
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} while (0)
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#define LL_APPEND(head,add) \
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do { \
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LDECLTYPE(head) _tmp; \
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(add)->next=NULL; \
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if (head) { \
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_tmp = head; \
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while (_tmp->next) { _tmp = _tmp->next; } \
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_tmp->next=(add); \
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} else { \
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(head)=(add); \
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} \
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} while (0)
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#define LL_DELETE(head,del) \
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do { \
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LDECLTYPE(head) _tmp; \
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if ((head) == (del)) { \
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(head)=(head)->next; \
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} else { \
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_tmp = head; \
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while (_tmp->next && (_tmp->next != (del))) { \
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_tmp = _tmp->next; \
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} \
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if (_tmp->next) { \
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_tmp->next = ((del)->next); \
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} \
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} \
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} while (0)
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/* Here are VS2008 replacements for LL_APPEND and LL_DELETE */
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#define LL_APPEND_VS2008(head,add) \
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do { \
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if (head) { \
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(add)->next = head; /* use add->next as a temp variable */ \
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while ((add)->next->next) { (add)->next = (add)->next->next; } \
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(add)->next->next=(add); \
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} else { \
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(head)=(add); \
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} \
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(add)->next=NULL; \
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} while (0)
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#define LL_DELETE_VS2008(head,del) \
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do { \
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if ((head) == (del)) { \
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(head)=(head)->next; \
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} else { \
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char *_tmp = (char*)(head); \
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while (head->next && (head->next != (del))) { \
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head = head->next; \
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} \
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if (head->next) { \
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head->next = ((del)->next); \
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} \
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{ \
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char **_head_alias = (char**)&(head); \
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*_head_alias = _tmp; \
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} \
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} \
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} while (0)
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#ifdef NO_DECLTYPE
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#undef LL_APPEND
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#define LL_APPEND LL_APPEND_VS2008
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#undef LL_DELETE
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#define LL_DELETE LL_DELETE_VS2008
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#endif
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/* end VS2008 replacements */
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#define LL_FOREACH(head,el) \
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for(el=head;el;el=el->next)
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#define LL_FOREACH_SAFE(head,el,tmp) \
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for((el)=(head);(el) && (tmp = (el)->next, 1); (el) = tmp)
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#define LL_SEARCH_SCALAR(head,out,field,val) \
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do { \
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LL_FOREACH(head,out) { \
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if ((out)->field == (val)) break; \
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} \
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} while(0)
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#define LL_SEARCH(head,out,elt,cmp) \
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do { \
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LL_FOREACH(head,out) { \
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if ((cmp(out,elt))==0) break; \
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} \
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} while(0)
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/******************************************************************************
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* doubly linked list macros (non-circular) *
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*****************************************************************************/
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#define DL_PREPEND(head,add) \
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do { \
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(add)->next = head; \
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if (head) { \
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(add)->prev = (head)->prev; \
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(head)->prev = (add); \
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} else { \
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(add)->prev = (add); \
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} \
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(head) = (add); \
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} while (0)
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#define DL_APPEND(head,add) \
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do { \
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if (head) { \
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(add)->prev = (head)->prev; \
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(head)->prev->next = (add); \
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(head)->prev = (add); \
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(add)->next = NULL; \
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} else { \
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(head)=(add); \
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(head)->prev = (head); \
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(head)->next = NULL; \
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} \
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} while (0);
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#define DL_DELETE(head,del) \
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do { \
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if ((del)->prev == (del)) { \
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(head)=NULL; \
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} else if ((del)==(head)) { \
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(del)->next->prev = (del)->prev; \
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(head) = (del)->next; \
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} else { \
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(del)->prev->next = (del)->next; \
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if ((del)->next) { \
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(del)->next->prev = (del)->prev; \
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} else { \
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(head)->prev = (del)->prev; \
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} \
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} \
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} while (0);
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#define DL_FOREACH(head,el) \
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for(el=head;el;el=el->next)
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/* this version is safe for deleting the elements during iteration */
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#define DL_FOREACH_SAFE(head,el,tmp) \
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for((el)=(head);(el) && (tmp = (el)->next, 1); (el) = tmp)
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/* these are identical to their singly-linked list counterparts */
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#define DL_SEARCH_SCALAR LL_SEARCH_SCALAR
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#define DL_SEARCH LL_SEARCH
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/******************************************************************************
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* circular doubly linked list macros *
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*****************************************************************************/
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#define CDL_PREPEND(head,add) \
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do { \
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if (head) { \
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(add)->prev = (head)->prev; \
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(add)->next = (head); \
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(head)->prev = (add); \
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(add)->prev->next = (add); \
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} else { \
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(add)->prev = (add); \
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(add)->next = (add); \
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} \
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(head)=(add); \
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} while (0)
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#define CDL_DELETE(head,del) \
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do { \
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if ( ((head)==(del)) && ((head)->next == (head))) { \
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(head) = 0L; \
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} else { \
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(del)->next->prev = (del)->prev; \
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(del)->prev->next = (del)->next; \
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if ((del) == (head)) (head)=(del)->next; \
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} \
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} while (0);
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#define CDL_FOREACH(head,el) \
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for(el=head;el;el=(el->next==head ? 0L : el->next))
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#define CDL_FOREACH_SAFE(head,el,tmp1,tmp2) \
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for((el)=(head), ((tmp1)=(head)?((head)->prev):NULL); \
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(el) && ((tmp2)=(el)->next, 1); \
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((el) = (((el)==(tmp1)) ? 0L : (tmp2))))
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#define CDL_SEARCH_SCALAR(head,out,field,val) \
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do { \
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CDL_FOREACH(head,out) { \
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if ((out)->field == (val)) break; \
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} \
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} while(0)
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#define CDL_SEARCH(head,out,elt,cmp) \
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do { \
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CDL_FOREACH(head,out) { \
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if ((cmp(out,elt))==0) break; \
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} \
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} while(0)
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#endif /* UTLIST_H */
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