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485aef42c9
in two places. While here don't bother returning anything from Lst_Replace - nobody ever checks the return code. Suggested by: jmallet
346 lines
8.5 KiB
C
346 lines
8.5 KiB
C
/*-
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* Copyright (c) 1988, 1989, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*-
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* lst.c --
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* Routines to maintain a linked list of objects.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "lst.h"
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#include "make.h"
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#include "util.h"
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/**
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* Lst_Append
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* Create a new node and add it to the given list after the given node.
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*
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* Arguments:
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* l affected list
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* ln node after which to append the datum
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* d said datum
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*
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* Side Effects:
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* A new LstNode is created and linked in to the List. The lastPtr
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* field of the List will be altered if ln is the last node in the
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* list. lastPtr and firstPtr will alter if the list was empty and
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* ln was NULL.
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*/
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void
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Lst_Append(Lst *list, LstNode *ln, void *d)
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{
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LstNode *nLNode;
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nLNode = emalloc(sizeof(*nLNode));
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nLNode->datum = d;
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if (ln == NULL) {
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nLNode->nextPtr = nLNode->prevPtr = NULL;
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list->firstPtr = list->lastPtr = nLNode;
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} else {
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nLNode->prevPtr = ln;
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nLNode->nextPtr = ln->nextPtr;
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ln->nextPtr = nLNode;
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if (nLNode->nextPtr != NULL) {
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nLNode->nextPtr->prevPtr = nLNode;
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}
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if (ln == list->lastPtr) {
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list->lastPtr = nLNode;
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}
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}
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}
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/**
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* Lst_Concat
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* Concatenate two lists. New elements are created to hold the data
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* elements, if specified, but the elements themselves are not copied.
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* If the elements should be duplicated to avoid confusion with another
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* list, the Lst_Duplicate function should be called first.
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*
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* Arguments:
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* list1 The list to which list2 is to be appended
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* list2 The list to append to list1
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* flags LST_CONCNEW if LstNode's should be duplicated
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* LST_CONCLINK if should just be relinked
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*
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* Side Effects:
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* New elements are created and appended the the first list.
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*/
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void
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Lst_Concat(Lst *list1, Lst *list2, int flags)
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{
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LstNode *ln; /* original LstNode */
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LstNode *nln; /* new LstNode */
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LstNode *last; /* the last element in the list. Keeps
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* bookkeeping until the end */
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if (list2->firstPtr == NULL)
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return;
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if (flags == LST_CONCLINK) {
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/*
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* Link the first element of the second list to the last
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* element of the first list. If the first list isn't empty,
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* we then link the last element of the list to the first
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* element of the second list. The last element of the second
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* list, if it exists, then becomes the last element of the
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* first list.
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*/
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list2->firstPtr->prevPtr = list1->lastPtr;
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if (list1->lastPtr != NULL)
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list1->lastPtr->nextPtr = list2->firstPtr;
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else
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list1->firstPtr = list2->firstPtr;
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list1->lastPtr = list2->lastPtr;
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Lst_Init(list2);
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} else {
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/*
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* The loop simply goes through the entire second list creating
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* new LstNodes and filling in the nextPtr, and prevPtr to fit
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* into list1 and its datum field from the datum field of the
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* corresponding element in list2. The 'last' node follows the
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* last of the new nodes along until the entire list2 has been
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* appended. Only then does the bookkeeping catch up with the
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* changes. During the first iteration of the loop, if 'last'
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* is NULL, the first list must have been empty so the
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* newly-created node is made the first node of the list.
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*/
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for (last = list1->lastPtr, ln = list2->firstPtr;
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ln != NULL;
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ln = ln->nextPtr) {
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nln = emalloc(sizeof(*nln));
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nln->datum = ln->datum;
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if (last != NULL) {
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last->nextPtr = nln;
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} else {
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list1->firstPtr = nln;
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}
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nln->prevPtr = last;
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last = nln;
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}
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/*
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* Finish bookkeeping. The last new element becomes the last
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* element of list one.
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*/
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list1->lastPtr = last;
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last->nextPtr = NULL;
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}
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}
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/**
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* Lst_DeQueue
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* Remove and return the datum at the head of the given list.
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*
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* Results:
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* The datum in the node at the head or (ick) NULL if the list
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* is empty.
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*
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* Side Effects:
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* The head node is removed from the list.
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*/
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void *
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Lst_DeQueue(Lst *l)
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{
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void *rd;
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LstNode *tln;
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tln = Lst_First(l);
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if (tln == NULL) {
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return (NULL);
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}
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rd = tln->datum;
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Lst_Remove(l, tln);
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return (rd);
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}
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/**
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* Lst_Destroy
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* Destroy a list and free all its resources. If the freeProc is
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* given, it is called with the datum from each node in turn before
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* the node is freed.
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*
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* Side Effects:
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* The given list is freed in its entirety.
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*/
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void
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Lst_Destroy(Lst *list, FreeProc *freeProc)
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{
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LstNode *ln;
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if (list->firstPtr == NULL)
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return;
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if (freeProc != NOFREE) {
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while ((ln = list->firstPtr) != NULL) {
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list->firstPtr = ln->nextPtr;
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(*freeProc)(ln->datum);
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free(ln);
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}
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} else {
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while ((ln = list->firstPtr) != NULL) {
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list->firstPtr = ln->nextPtr;
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free(ln);
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}
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}
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list->lastPtr = NULL;
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}
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/**
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* Lst_Duplicate
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* Duplicate an entire list. If a function to copy a void * is
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* given, the individual client elements will be duplicated as well.
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*
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* Arguments:
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* dst the destination list (initialized)
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* src the list to duplicate
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* copyProc A function to duplicate each void
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*/
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void
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Lst_Duplicate(Lst *dst, Lst *src, DuplicateProc *copyProc)
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{
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LstNode *ln;
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ln = src->firstPtr;
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while (ln != NULL) {
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if (copyProc != NOCOPY)
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Lst_AtEnd(dst, (*copyProc)(ln->datum));
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else
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Lst_AtEnd(dst, ln->datum);
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ln = ln->nextPtr;
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}
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}
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/**
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* Lst_Insert
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* Insert a new node with the given piece of data before the given
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* node in the given list.
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*
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* Parameters:
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* l list to manipulate
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* ln node before which to insert d
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* d datum to be inserted
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*
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* Side Effects:
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* the firstPtr field will be changed if ln is the first node in the
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* list.
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*/
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void
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Lst_Insert(Lst *list, LstNode *ln, void *d)
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{
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LstNode *nLNode; /* new lnode for d */
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nLNode = emalloc(sizeof(*nLNode));
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nLNode->datum = d;
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if (ln == NULL) {
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nLNode->prevPtr = nLNode->nextPtr = NULL;
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list->firstPtr = list->lastPtr = nLNode;
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} else {
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nLNode->prevPtr = ln->prevPtr;
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nLNode->nextPtr = ln;
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if (nLNode->prevPtr != NULL) {
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nLNode->prevPtr->nextPtr = nLNode;
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}
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ln->prevPtr = nLNode;
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if (ln == list->firstPtr) {
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list->firstPtr = nLNode;
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}
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}
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}
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LstNode *
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Lst_Member(Lst *list, void *d)
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{
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LstNode *lNode;
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lNode = list->firstPtr;
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if (lNode == NULL) {
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return (NULL);
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}
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do {
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if (lNode->datum == d) {
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return (lNode);
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}
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lNode = lNode->nextPtr;
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} while (lNode != NULL && lNode != list->firstPtr);
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return (NULL);
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}
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/**
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* Lst_Remove
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* Remove the given node from the given list.
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*
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* Side Effects:
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* The list's firstPtr will be set to NULL if ln is the last
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* node on the list. firsPtr and lastPtr will be altered if ln is
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* either the first or last node, respectively, on the list.
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*/
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void
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Lst_Remove(Lst *list, LstNode *ln)
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{
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/*
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* unlink it from the list
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*/
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if (ln->nextPtr != NULL)
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/* unlink from the backward chain */
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ln->nextPtr->prevPtr = ln->prevPtr;
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else
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/* this was the last element */
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list->lastPtr = ln->prevPtr;
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if (ln->prevPtr != NULL)
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/* unlink from the forward chain */
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ln->prevPtr->nextPtr = ln->nextPtr;
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else
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/* this was the first element */
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list->firstPtr = ln->nextPtr;
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/*
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* note that the datum is unmolested. The caller must free it as
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* necessary and as expected.
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*/
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free(ln);
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}
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