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This commit is contained in:
James Gregory 2013-12-31 11:38:48 +11:00
commit f658bfbb40
203 changed files with 26546 additions and 25801 deletions
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134
15-02.md
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@ -12,57 +12,63 @@ pages: 284-287
**LISTING 15.1 L15-1.C**
/* Deletes the node in a linked list that follows the indicated node.
Assumes list is headed by a dummy node, so no special testing for
the head-of-list pointer is required. Returns the same pointer
that was passed in. */
```c
/* Deletes the node in a linked list that follows the indicated node.
Assumes list is headed by a dummy node, so no special testing for
the head-of-list pointer is required. Returns the same pointer
that was passed in. */
#include "llist.h"
struct LinkNode *DeleteNodeAfter(struct LinkNode *NodeToDeleteAfter)
{
NodeToDeleteAfter->NextNode =
NodeToDeleteAfter->NextNode->NextNode;
return(NodeToDeleteAfter);
}
#include "llist.h"
struct LinkNode *DeleteNodeAfter(struct LinkNode *NodeToDeleteAfter)
{
NodeToDeleteAfter->NextNode =
NodeToDeleteAfter->NextNode->NextNode;
return(NodeToDeleteAfter);
}
```
**LISTING 15.2 LLIST.H**
/* Linked list header file. */
#define MAX_TEXT_LENGTH 100 /* longest allowed Text field */
#define SENTINEL 32767 /* largest possible Value field */
```c
/* Linked list header file. */
#define MAX_TEXT_LENGTH 100 /* longest allowed Text field */
#define SENTINEL 32767 /* largest possible Value field */
struct LinkNode {
struct LinkNode *NextNode;
int Value;
char Text[MAX_TEXT_LENGTH+1];
/* Any number of additional data fields may by present */
};
struct LinkNode *DeleteNodeAfter(struct LinkNode *);
struct LinkNode *FindNodeBeforeValue(struct LinkNode *, int);
struct LinkNode *InitLinkedList(void);
struct LinkNode *InsertNodeSorted(struct LinkNode *,
struct LinkNode *);
struct LinkNode {
struct LinkNode *NextNode;
int Value;
char Text[MAX_TEXT_LENGTH+1];
/* Any number of additional data fields may by present */
};
struct LinkNode *DeleteNodeAfter(struct LinkNode *);
struct LinkNode *FindNodeBeforeValue(struct LinkNode *, int);
struct LinkNode *InitLinkedList(void);
struct LinkNode *InsertNodeSorted(struct LinkNode *,
struct LinkNode *);
```
**LISTING 15.3 L15-3.C**
/* Deletes the node in the specified linked list that follows the
indicated node. List is headed by a head-of-list pointer; if the
pointer to the node to delete after points to the head-of-list
pointer, special handling is performed. */
#include "llist.h"
struct LinkNode *DeleteNodeAfter(struct LinkNode **HeadOfListPtr,
struct LinkNode *NodeToDeleteAfter)
{
/* Handle specially if the node to delete after is actually the
head of the list (delete the first element in the list) */
if (NodeToDeleteAfter == (struct LinkNode *)HeadOfListPtr) {
*HeadOfListPtr = (*HeadOfListPtr)->NextNode;
} else {
NodeToDeleteAfter->NextNode =
NodeToDeleteAfter->NextNode->NextNode;
}
return(NodeToDeleteAfter);
}
```c
/* Deletes the node in the specified linked list that follows the
indicated node. List is headed by a head-of-list pointer; if the
pointer to the node to delete after points to the head-of-list
pointer, special handling is performed. */
#include "llist.h"
struct LinkNode *DeleteNodeAfter(struct LinkNode **HeadOfListPtr,
struct LinkNode *NodeToDeleteAfter)
{
/* Handle specially if the node to delete after is actually the
head of the list (delete the first element in the list) */
if (NodeToDeleteAfter == (struct LinkNode *)HeadOfListPtr) {
*HeadOfListPtr = (*HeadOfListPtr)->NextNode;
} else {
NodeToDeleteAfter->NextNode =
NodeToDeleteAfter->NextNode->NextNode;
}
return(NodeToDeleteAfter);
}
```
However, it is true that if you're going to store a variety of types of
structures in your linked lists, you should start each node with the
@ -123,28 +129,30 @@ value has to perform two tests in the inner loop, as shown in Listing
**LISTING 15.4 L15-4.C**
/* Finds the first node in a linked list with a value field greater
than or equal to a key value, and returns a pointer to the node
preceding that node (to facilitate insertion and deletion), or a
NULL pointer if no such value was found. Assumes the list is
terminated with a tail node pointing to itself as the next node. */
#include <stdio.h>
#include "llist.h"
struct LinkNode *FindNodeBeforeValueNotLess(
struct LinkNode *HeadOfListNode, int SearchValue)
{
struct LinkNode *NodePtr = HeadOfListNode;
```c
/* Finds the first node in a linked list with a value field greater
than or equal to a key value, and returns a pointer to the node
preceding that node (to facilitate insertion and deletion), or a
NULL pointer if no such value was found. Assumes the list is
terminated with a tail node pointing to itself as the next node. */
#include <stdio.h>
#include "llist.h"
struct LinkNode *FindNodeBeforeValueNotLess(
struct LinkNode *HeadOfListNode, int SearchValue)
{
struct LinkNode *NodePtr = HeadOfListNode;
while ( (NodePtr->NextNode->NextNode != NodePtr->NextNode) &&
(NodePtr->NextNode->Value < SearchValue) )
NodePtr = NodePtr->NextNode;
while ( (NodePtr->NextNode->NextNode != NodePtr->NextNode) &&
(NodePtr->NextNode->Value < SearchValue) )
NodePtr = NodePtr->NextNode;
if (NodePtr->NextNode->NextNode == NodePtr->NextNode)
return(NULL); /* we found the sentinel; failed search */
else
return(NodePtr); /* success; return pointer to node preceding
node that was >= */
}
if (NodePtr->NextNode->NextNode == NodePtr->NextNode)
return(NULL); /* we found the sentinel; failed search */
else
return(NodePtr); /* success; return pointer to node preceding
node that was >= */
}
```
Suppose, however, that we make the tail node a *sentinel* by giving it a
value that is guaranteed to terminate the search, as shown in Figure