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148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/* Generic single linked list to keep various information
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Copyright (C) 1993, 1994, 1996 Free Software Foundation, Inc.
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Contributed by Kresten Krab Thorup.
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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, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, 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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#ifndef __GNU_OBJC_LIST_H
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#define __GNU_OBJC_LIST_H
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struct objc_list {
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void *head;
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struct objc_list *tail;
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};
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/* Return a cons cell produced from (head . tail) */
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static inline struct objc_list*
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list_cons(void* head, struct objc_list* tail)
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{
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struct objc_list* cell;
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cell = (struct objc_list*)objc_malloc(sizeof(struct objc_list));
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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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static inline int
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list_length(struct objc_list* 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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static inline void*
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list_nth(int index, struct objc_list* 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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static inline void
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list_remove_head(struct objc_list** list)
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{
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if ((*list)->tail)
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{
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struct objc_list* tail = (*list)->tail; /* fetch next */
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*(*list) = *tail; /* copy next to list head */
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objc_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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objc_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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static inline void
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list_remove_elem(struct objc_list** list, void* elem)
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{
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while (*list) {
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if ((*list)->head == elem)
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list_remove_head(list);
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list = &((*list)->tail);
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}
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}
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/* Map FUNCTION over all elements in LIST */
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static inline void
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list_mapcar(struct objc_list* 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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/* Return element that has ELEM as car */
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static inline struct objc_list**
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list_find(struct objc_list** 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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static void
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list_free(struct objc_list* 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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objc_free(list);
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}
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}
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#endif /* not __GNU_OBJC_LIST_H */
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