Return to list.h CVS log

Up to [Apple XNU] / GNUtools / cc / objc

Annotation of GNUtools/cc/objc/list.h, revision 1.1

1.1     ! root        1: /* Generic single linked list to keep various information 
        !             2:    Copyright (C) 1993 Free Software Foundation, Inc.
        !             3: 
        !             4: Author: Kresten Krab Thorup
        !             5: 
        !             6: This file is part of GNU CC.
        !             7: 
        !             8: GNU CC is free software; you can redistribute it and/or modify it under the
        !             9:    terms of the GNU General Public License as published by the Free Software
        !            10:    Foundation; either version 2, or (at your option) any later version.
        !            11: 
        !            12: GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
        !            13:    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
        !            14:    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
        !            15:    details.
        !            16: 
        !            17: You should have received a copy of the GNU General Public License along with
        !            18:    GNU CC; see the file COPYING.  If not, write to the Free Software
        !            19:    Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            20: 
        !            21: /* As a special exception, if you link this library with files compiled with
        !            22:    GCC to produce an executable, this does not cause the resulting executable
        !            23:    to be covered by the GNU General Public License. This exception does not
        !            24:    however invalidate any other reasons why the executable file might be
        !            25:    covered by the GNU General Public License.  */
        !            26: 
        !            27: void * __objc_xrealloc (void *optr, size_t size);
        !            28: void * __objc_xmalloc (size_t size);
        !            29: 
        !            30: struct objc_list {
        !            31:   void *head;
        !            32:   struct objc_list *tail;
        !            33: };
        !            34: 
        !            35: /* Return a cons cell produced from (head . tail) */
        !            36: 
        !            37: static inline struct objc_list* 
        !            38: list_cons(void* head, struct objc_list* tail)
        !            39: {
        !            40:   struct objc_list* cell;
        !            41: 
        !            42:   cell = (struct objc_list*)__objc_xmalloc(sizeof(struct objc_list));
        !            43:   cell->head = head;
        !            44:   cell->tail = tail;
        !            45:   return cell;
        !            46: }
        !            47: 
        !            48: /* Return the length of a list, list_length(NULL) returns zero */
        !            49: 
        !            50: static inline int
        !            51: list_length(struct objc_list* list)
        !            52: {
        !            53:   int i = 0;
        !            54:   while(list)
        !            55:     {
        !            56:       i += 1;
        !            57:       list = list->tail;
        !            58:     }
        !            59:   return i;
        !            60: }
        !            61: 
        !            62: /* Return the Nth element of LIST, where N count from zero.  If N 
        !            63:    larger than the list length, NULL is returned  */
        !            64: 
        !            65: static inline void*
        !            66: list_nth(int index, struct objc_list* list)
        !            67: {
        !            68:   while(index-- != 0)
        !            69:     {
        !            70:       if(list->tail)
        !            71:        list = list->tail;
        !            72:       else
        !            73:        return 0;
        !            74:     }
        !            75:   return list->head;
        !            76: }
        !            77: 
        !            78: /* Remove the element at the head by replacing it by its successor */
        !            79: 
        !            80: static inline void
        !            81: list_remove_head(struct objc_list** list)
        !            82: {
        !            83:   if ((*list)->tail)
        !            84:     {
        !            85:       struct objc_list* tail = (*list)->tail; /* fetch next */
        !            86:       *(*list) = *tail;                /* copy next to list head */
        !            87:       free(tail);                      /* free next */
        !            88:     }
        !            89:   else                         /* only one element in list */
        !            90:     {
        !            91:       free (*list);
        !            92:       (*list) = 0;
        !            93:     }
        !            94: }
        !            95: 
        !            96: 
        !            97: /* Remove the element with `car' set to ELEMENT */
        !            98: 
        !            99: static inline void
        !           100: list_remove_elem(struct objc_list** list, void* elem)
        !           101: {
        !           102:   while (*list) {
        !           103:     if ((*list)->head == elem)
        !           104:       list_remove_head(list);
        !           105:     list = &((*list)->tail);
        !           106:   }
        !           107: }
        !           108: 
        !           109: /* Map FUNCTION over all elements in LIST */
        !           110: 
        !           111: static inline void
        !           112: list_mapcar(struct objc_list* list, void(*function)(void*))
        !           113: {
        !           114:   while(list)
        !           115:     {
        !           116:       (*function)(list->head);
        !           117:       list = list->tail;
        !           118:     }
        !           119: }
        !           120: 
        !           121: /* Return element that has ELEM as car */
        !           122: 
        !           123: static inline struct objc_list**
        !           124: list_find(struct objc_list** list, void* elem)
        !           125: {
        !           126:   while(*list)
        !           127:     {
        !           128:     if ((*list)->head == elem)
        !           129:       return list;
        !           130:     list = &((*list)->tail);
        !           131:     }
        !           132:   return NULL;
        !           133: }
        !           134: 
        !           135: /* Free list (backwards recursive) */
        !           136: 
        !           137: static void
        !           138: list_free(struct objc_list* list)
        !           139: {
        !           140:   if(list)
        !           141:     {
        !           142:       list_free(list->tail);
        !           143:       free(list);
        !           144:     }
        !           145: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.