70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
#include "file.h"
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/* how we print your linked list to test if it is correct or not*/
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void print(){
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node *ptr = head;
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while(ptr != NULL){
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printf("%d->",ptr->data);
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ptr = ptr->next;
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}
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printf("\n");
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}
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/* function to add a node to the list for you use in fwrite*/
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void append(node * n){
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n->next = head->next;
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head->next = n;
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}
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/*function to get the last node for you to allow you to save it a file*/
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node * getLast(){
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if(!head->next){
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return NULL;
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}
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node * ptr = head->next->next;
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node * tmp = head->next;
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node * prev = head;
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while(ptr != NULL){
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prev = tmp;
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tmp = ptr;
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ptr = ptr->next;
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}
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prev->next = NULL;
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return tmp;
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}
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/* read a node from file until you reach an EOF. Each node you read please save to the linked list with append()*/
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void read_node(char * filename){
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FILE* in = fopen(filename, "rb");
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node* item = (node *) malloc(sizeof(node));
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int bytesRead = fread(item, sizeof(node), 1, in);
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while (bytesRead > 0) {
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append(item);
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item = (node *) malloc(sizeof(node));
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bytesRead = fread(item, sizeof(node), 1, in);
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}
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fclose(in);
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}
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/* USING get last keep writing to file until getLast() returns NULL
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* Please use fwrite in binary mode to do this
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* Make sure that you are setting node->next = NULL*/
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void write_node(char * filename){
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FILE* out = fopen(filename, "wb");
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node* item = getLast();
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while (item != NULL) {
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item->next = NULL;
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fwrite(item, sizeof(node), 1, out);
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free(item);
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item = NULL;
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item = getLast();
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}
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fclose(out);
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}
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