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Diffstat (limited to 'usr.bin/make/lst.c')
| -rw-r--r-- | usr.bin/make/lst.c | 344 |
1 files changed, 0 insertions, 344 deletions
diff --git a/usr.bin/make/lst.c b/usr.bin/make/lst.c deleted file mode 100644 index d57c34b..0000000 --- a/usr.bin/make/lst.c +++ /dev/null @@ -1,344 +0,0 @@ -/*- - * 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. - * - * $FreeBSD$ - */ - -/*- - * lst.c -- - * Routines to maintain a linked list of objects. - */ - -#include <stdio.h> -#include <stdlib.h> - -#include "lst.h" -#include "util.h" - -/** - * Lst_Append - * Create a new node and add it to the given list after the given node. - * - * Arguments: - * l affected list - * ln node after which to append the datum - * d said datum - * - * Side Effects: - * A new LstNode is created and linked in to the List. The lastPtr - * field of the List will be altered if ln is the last node in the - * list. lastPtr and firstPtr will alter if the list was empty and - * ln was NULL. - */ -void -Lst_Append(Lst *list, LstNode *ln, void *d) -{ - LstNode *nLNode; - - nLNode = emalloc(sizeof(*nLNode)); - nLNode->datum = d; - - if (ln == NULL) { - nLNode->nextPtr = nLNode->prevPtr = NULL; - list->firstPtr = list->lastPtr = nLNode; - } else { - nLNode->prevPtr = ln; - nLNode->nextPtr = ln->nextPtr; - - ln->nextPtr = nLNode; - if (nLNode->nextPtr != NULL) { - nLNode->nextPtr->prevPtr = nLNode; - } - - if (ln == list->lastPtr) { - list->lastPtr = nLNode; - } - } -} - -/** - * Lst_Concat - * Concatenate two lists. New elements are created to hold the data - * elements, if specified, but the elements themselves are not copied. - * If the elements should be duplicated to avoid confusion with another - * list, the Lst_Duplicate function should be called first. - * - * Arguments: - * list1 The list to which list2 is to be appended - * list2 The list to append to list1 - * flags LST_CONCNEW if LstNode's should be duplicated - * LST_CONCLINK if should just be relinked - * - * Side Effects: - * New elements are created and appended the first list. - */ -void -Lst_Concat(Lst *list1, Lst *list2, int flags) -{ - LstNode *ln; /* original LstNode */ - LstNode *nln; /* new LstNode */ - LstNode *last; /* the last element in the list. Keeps - * bookkeeping until the end */ - - if (list2->firstPtr == NULL) - return; - - if (flags == LST_CONCLINK) { - /* - * Link the first element of the second list to the last - * element of the first list. If the first list isn't empty, - * we then link the last element of the list to the first - * element of the second list. The last element of the second - * list, if it exists, then becomes the last element of the - * first list. - */ - list2->firstPtr->prevPtr = list1->lastPtr; - if (list1->lastPtr != NULL) - list1->lastPtr->nextPtr = list2->firstPtr; - else - list1->firstPtr = list2->firstPtr; - list1->lastPtr = list2->lastPtr; - - Lst_Init(list2); - } else { - /* - * The loop simply goes through the entire second list creating - * new LstNodes and filling in the nextPtr, and prevPtr to fit - * into list1 and its datum field from the datum field of the - * corresponding element in list2. The 'last' node follows the - * last of the new nodes along until the entire list2 has been - * appended. Only then does the bookkeeping catch up with the - * changes. During the first iteration of the loop, if 'last' - * is NULL, the first list must have been empty so the - * newly-created node is made the first node of the list. - */ - for (last = list1->lastPtr, ln = list2->firstPtr; - ln != NULL; - ln = ln->nextPtr) { - nln = emalloc(sizeof(*nln)); - nln->datum = ln->datum; - if (last != NULL) { - last->nextPtr = nln; - } else { - list1->firstPtr = nln; - } - nln->prevPtr = last; - last = nln; - } - - /* - * Finish bookkeeping. The last new element becomes the last - * element of list one. - */ - list1->lastPtr = last; - last->nextPtr = NULL; - } -} - -/** - * Lst_DeQueue - * Remove and return the datum at the head of the given list. - * - * Results: - * The datum in the node at the head or (ick) NULL if the list - * is empty. - * - * Side Effects: - * The head node is removed from the list. - */ -void * -Lst_DeQueue(Lst *l) -{ - void *rd; - LstNode *tln; - - tln = Lst_First(l); - if (tln == NULL) { - return (NULL); - } - - rd = tln->datum; - Lst_Remove(l, tln); - return (rd); -} - -/** - * Lst_Destroy - * Destroy a list and free all its resources. If the freeProc is - * given, it is called with the datum from each node in turn before - * the node is freed. - * - * Side Effects: - * The given list is freed in its entirety. - */ -void -Lst_Destroy(Lst *list, FreeProc *freeProc) -{ - LstNode *ln; - - if (list->firstPtr == NULL) - return; - - if (freeProc != NOFREE) { - while ((ln = list->firstPtr) != NULL) { - list->firstPtr = ln->nextPtr; - (*freeProc)(ln->datum); - free(ln); - } - } else { - while ((ln = list->firstPtr) != NULL) { - list->firstPtr = ln->nextPtr; - free(ln); - } - } - list->lastPtr = NULL; -} - -/** - * Lst_Duplicate - * Duplicate an entire list. If a function to copy a void * is - * given, the individual client elements will be duplicated as well. - * - * Arguments: - * dst the destination list (initialized) - * src the list to duplicate - * copyProc A function to duplicate each void - */ -void -Lst_Duplicate(Lst *dst, Lst *src, DuplicateProc *copyProc) -{ - LstNode *ln; - - ln = src->firstPtr; - while (ln != NULL) { - if (copyProc != NOCOPY) - Lst_AtEnd(dst, (*copyProc)(ln->datum)); - else - Lst_AtEnd(dst, ln->datum); - ln = ln->nextPtr; - } -} - -/** - * Lst_Insert - * Insert a new node with the given piece of data before the given - * node in the given list. - * - * Parameters: - * l list to manipulate - * ln node before which to insert d - * d datum to be inserted - * - * Side Effects: - * the firstPtr field will be changed if ln is the first node in the - * list. - */ -void -Lst_Insert(Lst *list, LstNode *ln, void *d) -{ - LstNode *nLNode; /* new lnode for d */ - - nLNode = emalloc(sizeof(*nLNode)); - nLNode->datum = d; - - if (ln == NULL) { - nLNode->prevPtr = nLNode->nextPtr = NULL; - list->firstPtr = list->lastPtr = nLNode; - } else { - nLNode->prevPtr = ln->prevPtr; - nLNode->nextPtr = ln; - - if (nLNode->prevPtr != NULL) { - nLNode->prevPtr->nextPtr = nLNode; - } - ln->prevPtr = nLNode; - - if (ln == list->firstPtr) { - list->firstPtr = nLNode; - } - } -} - -LstNode * -Lst_Member(Lst *list, void *d) -{ - LstNode *lNode; - - lNode = list->firstPtr; - if (lNode == NULL) { - return (NULL); - } - - do { - if (lNode->datum == d) { - return (lNode); - } - lNode = lNode->nextPtr; - } while (lNode != NULL && lNode != list->firstPtr); - - return (NULL); -} - -/** - * Lst_Remove - * Remove the given node from the given list. - * - * Side Effects: - * The list's firstPtr will be set to NULL if ln is the last - * node on the list. firsPtr and lastPtr will be altered if ln is - * either the first or last node, respectively, on the list. - */ -void -Lst_Remove(Lst *list, LstNode *ln) -{ - /* - * unlink it from the list - */ - if (ln->nextPtr != NULL) - /* unlink from the backward chain */ - ln->nextPtr->prevPtr = ln->prevPtr; - else - /* this was the last element */ - list->lastPtr = ln->prevPtr; - - if (ln->prevPtr != NULL) - /* unlink from the forward chain */ - ln->prevPtr->nextPtr = ln->nextPtr; - else - /* this was the first element */ - list->firstPtr = ln->nextPtr; - - /* - * note that the datum is unmolested. The caller must free it as - * necessary and as expected. - */ - free(ln); -} |
