C LinkedList not writing to pointer
C LinkedList not writing to pointer
For some reason whenever I try to write to “queue”, it does not actually write the new linked list. What am I doing wrong?
/*
Khanh Nguyen
CSE 1320, hw #8
example file for demonstrating how to use functions required for this assignment
to use this file, do the following:
1) download the following to your directory on omega:
a) example-hw08.c (this file)
b) hw08-header.h
c) hw08-source.o
2) compile this file and link to the object file using
gcc -std=c89 -pedantic example-hw08.c hw08-source.o
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "hw08-header.h" /* note header */
typedef struct node{
int classNumber;
char *className;
struct node *next;
} Queue;
void parseCommand(char *cmd, Queue **queue);
int main(int argc, char* argv[])
{
int i = 0;
char *value = "go";
int key;
Queue *queues = calloc(3, sizeof(Queue));
(queues)->next = NULL;
(queues + (sizeof(Queue) * 1))->next = NULL;
(queues + (sizeof(Queue) * 2))->next = NULL;
if(argc != 2)
{
printf(" usage: program_name positive_integern");
printf("example: ./example-hw08 123n");
exit(1);
}
/************** begin REQUIRED **************/
/* put before logic. DO NOT PUT IN A LOOP */
key = atoi(argv[1]);
initialize(key);
/************** end REQUIRED **************/
while(strcmp(value, "stop") != 0)
{
value = getString();
parseCommand(value, &queues);
}
printf("%dn", (queues + 1)->classNumber);
}
void parseCommand(char *cmd, Queue **queue) {
char *verb, *class, *name, *className;
int queueNumber, classNumber;
Queue *tempQueue = *queue, *node, *p;
verb = strtok(cmd, ",");
if(strcmp(verb, "stop") != 0) {
if(strcmp(verb, "enqueue") == 0) {
queueNumber = atoi(strtok(NULL, ","));
class = strtok(NULL, ",");
name = strtok(NULL, ",");
className = strtok(class, " ");
classNumber = atoi(strtok(NULL, " "));
printf("%s enters line %d to register for %s %dn", name, queueNumber, className, classNumber);
node = malloc(sizeof(queue));
node->classNumber = classNumber;
node->next = NULL;
p = tempQueue;
while(p->next != NULL) {
p = p->next;
}
p->next = node;
p = node;
*queue = tempQueue;
}
}
}
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