123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
|
/* $NetBSD: lstInsert.c,v 1.14 2009/01/23 21:26:30 dsl Exp $ */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright (c) 1988, 1989, 1990, 1993
|
||
|
|
* The Regents of the University of California. All rights reserved.
|
||
|
|
*
|
||
|
|
* This code is derived from software contributed to Berkeley by
|
||
|
|
* Adam de Boor.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 3. Neither the name of the University nor the names of its contributors
|
||
|
|
* may be used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
* SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef MAKE_NATIVE
|
||
|
|
static char rcsid[] = "$NetBSD: lstInsert.c,v 1.14 2009/01/23 21:26:30 dsl Exp $";
|
||
|
|
#else
|
||
|
|
#include <sys/cdefs.h>
|
||
|
|
#ifndef lint
|
||
|
|
#if 0
|
||
|
|
static char sccsid[] = "@(#)lstInsert.c 8.1 (Berkeley) 6/6/93";
|
||
|
|
#else
|
||
|
|
__RCSID("$NetBSD: lstInsert.c,v 1.14 2009/01/23 21:26:30 dsl Exp $");
|
||
|
|
#endif
|
||
|
|
#endif /* not lint */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*-
|
||
|
|
* LstInsert.c --
|
||
|
|
* Insert a new datum before an old one
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "lstInt.h"
|
||
|
|
|
||
|
|
/*-
|
||
|
|
*-----------------------------------------------------------------------
|
||
|
|
* Lst_InsertBefore --
|
||
|
|
* Insert a new node with the given piece of data before the given
|
||
|
|
* node in the given list.
|
||
|
|
*
|
||
|
|
* Input:
|
||
|
|
* l list to manipulate
|
||
|
|
* ln node before which to insert d
|
||
|
|
* d datum to be inserted
|
||
|
|
*
|
||
|
|
* Results:
|
||
|
|
* SUCCESS or FAILURE.
|
||
|
|
*
|
||
|
|
* Side Effects:
|
||
|
|
* the firstPtr field will be changed if ln is the first node in the
|
||
|
|
* list.
|
||
|
|
*
|
||
|
|
*-----------------------------------------------------------------------
|
||
|
|
*/
|
||
|
|
ReturnStatus
|
||
|
|
Lst_InsertBefore(Lst l, LstNode ln, void *d)
|
||
|
|
{
|
||
|
|
ListNode nLNode; /* new lnode for d */
|
||
|
|
ListNode lNode = ln;
|
||
|
|
List list = l;
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* check validity of arguments
|
||
|
|
*/
|
||
|
|
if (LstValid (l) && (LstIsEmpty (l) && ln == NULL))
|
||
|
|
goto ok;
|
||
|
|
|
||
|
|
if (!LstValid (l) || LstIsEmpty (l) || !LstNodeValid (ln, l)) {
|
||
|
|
return (FAILURE);
|
||
|
|
}
|
||
|
|
|
||
|
|
ok:
|
||
|
|
PAlloc (nLNode, ListNode);
|
||
|
|
|
||
|
|
nLNode->datum = d;
|
||
|
|
nLNode->useCount = nLNode->flags = 0;
|
||
|
|
|
||
|
|
if (ln == NULL) {
|
||
|
|
if (list->isCirc) {
|
||
|
|
nLNode->prevPtr = nLNode->nextPtr = nLNode;
|
||
|
|
} else {
|
||
|
|
nLNode->prevPtr = nLNode->nextPtr = NULL;
|
||
|
|
}
|
||
|
|
list->firstPtr = list->lastPtr = nLNode;
|
||
|
|
} else {
|
||
|
|
nLNode->prevPtr = lNode->prevPtr;
|
||
|
|
nLNode->nextPtr = lNode;
|
||
|
|
|
||
|
|
if (nLNode->prevPtr != NULL) {
|
||
|
|
nLNode->prevPtr->nextPtr = nLNode;
|
||
|
|
}
|
||
|
|
lNode->prevPtr = nLNode;
|
||
|
|
|
||
|
|
if (lNode == list->firstPtr) {
|
||
|
|
list->firstPtr = nLNode;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return (SUCCESS);
|
||
|
|
}
|
||
|
|
|