94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/** ------------------------------------------------------------------------
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This file contains routines for manipulating generic lists.
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Lists are implemented with a "harness". In other words, each
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node in the list consists of two pointers, one to the data item
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and one to the next node in the list. The head of the list is
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the same struct as each node, but the "item" ptr is used to point
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to the current member of the list (used by the first_in_list and
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next_in_list functions).
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Copyright 1994 Hewlett-Packard Co.
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Copyright 1996, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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-------------------------------------------------------------------- **/
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#ifndef LIST_DEF
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#define LIST_DEF
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#include <X11/Xfuncproto.h>
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#define LESS -1
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#define EQUAL 0
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#define GREATER 1
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#define DUP_WHOLE_LIST 0
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#define START_AT_CURR 1
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typedef struct _list_item {
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struct _list_item *next;
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union {
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void *item; /* in normal list node, pts to data */
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struct _list_item *curr; /* in list head, pts to curr for 1st, next */
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} ptr;
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} list, list_item, *list_ptr;
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typedef void (*DESTRUCT_FUNC_PTR)(
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void *
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);
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void zero_list(
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list_ptr
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);
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int add_to_list (
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list_ptr , void *
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);
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list_ptr new_list (
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void
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);
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list_ptr dup_list_head (
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list_ptr , int
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);
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unsigned int list_length(
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list_ptr
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);
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void *delete_from_list (
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list_ptr , void *
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);
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void delete_list(
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list_ptr , int
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);
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void delete_list_destroying (
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list_ptr , DESTRUCT_FUNC_PTR
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);
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void *first_in_list (
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list_ptr
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);
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void *next_in_list (
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list_ptr
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);
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int list_is_empty (
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list_ptr
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);
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#endif
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