169 lines
3.5 KiB
C
169 lines
3.5 KiB
C
/* Generic single linked list to keep various information
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Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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Author: Kresten Krab Thorup
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Many modifications by Alfredo K. Kojima
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301 USA. */
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/* As a special exception, if you link this library with files compiled with
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GCC to produce an executable, this does not cause the resulting executable
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to be covered by the GNU General Public License. This exception does not
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however invalidate any other reasons why the executable file might be
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covered by the GNU General Public License. */
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#include "list.h"
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <stdlib.h>
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/* Return a cons cell produced from (head . tail) */
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INLINE LinkedList*
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list_cons(void* head, LinkedList* tail)
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{
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LinkedList* cell;
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cell = (LinkedList*)malloc(sizeof(LinkedList));
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cell->head = head;
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cell->tail = tail;
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return cell;
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}
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/* Return the length of a list, list_length(NULL) returns zero */
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INLINE int
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list_length(LinkedList* list)
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{
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int i = 0;
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while(list)
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{
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i += 1;
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list = list->tail;
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}
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return i;
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}
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/* Return the Nth element of LIST, where N count from zero. If N
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larger than the list length, NULL is returned */
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INLINE void*
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list_nth(int index, LinkedList* list)
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{
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while(index-- != 0)
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{
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if(list->tail)
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list = list->tail;
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else
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return 0;
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}
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return list->head;
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}
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/* Remove the element at the head by replacing it by its successor */
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INLINE void
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list_remove_head(LinkedList** list)
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{
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if (!*list) return;
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if ((*list)->tail)
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{
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LinkedList* tail = (*list)->tail; /* fetch next */
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*(*list) = *tail; /* copy next to list head */
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free(tail); /* free next */
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}
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else /* only one element in list */
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{
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free(*list);
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(*list) = 0;
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}
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}
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/* Remove the element with `car' set to ELEMENT */
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/*
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INLINE void
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list_remove_elem(LinkedList** list, void* elem)
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{
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while (*list)
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{
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if ((*list)->head == elem)
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list_remove_head(list);
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*list = (*list ? (*list)->tail : NULL);
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}
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}*/
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INLINE LinkedList *
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list_remove_elem(LinkedList* list, void* elem)
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{
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LinkedList *tmp;
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if (list) {
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if (list->head == elem) {
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tmp = list->tail;
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free(list);
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return tmp;
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}
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list->tail = list_remove_elem(list->tail, elem);
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return list;
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}
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return NULL;
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}
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/* Return element that has ELEM as car */
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INLINE LinkedList*
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list_find(LinkedList* list, void* elem)
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{
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while(list)
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{
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if (list->head == elem)
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return list;
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list = list->tail;
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}
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return NULL;
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}
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/* Free list (backwards recursive) */
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INLINE void
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list_free(LinkedList* list)
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{
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if(list)
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{
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list_free(list->tail);
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free(list);
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}
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}
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/* Map FUNCTION over all elements in LIST */
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INLINE void
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list_mapcar(LinkedList* list, void(*function)(void*))
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{
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while(list)
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{
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(*function)(list->head);
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list = list->tail;
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}
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}
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