I am making a program that reads a text file and puts it into a linked list before carrying on with the other functions. The program also involves a thread function that operates every 5 seconds but the crash is happening at startup. Here is my code for the functions causing problems:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
//Strucutres
#define NODE struct node
struct node {
int number;
char name[20];
NODE *next;
};
#define LIST struct list
struct list {
NODE *head;
NODE *tail;
};
#define PARAM struct param
struct param {
char filename[20];
LIST *listpar;
};
pthread_mutex_t mutex;
//Declare functions
void read_file(LIST **, char *in);
LIST * add(LIST **list, char *fake, int fakenumber);
void show(LIST **list);
void delete(LIST **list);
void dispbin(char *input, LIST **list);
void *autosaver(void *arg);
int main(int argc, char *argv[]) {
LIST *list;
FILE *in;
PARAM *newP;
printf("%s",argv[1]);
printf("%s",argv[2]);
pthread_t thr;
pthread_mutex_init(&mutex, NULL);
if ((list=(LIST *)malloc(sizeof(LIST)))==NULL) {
printf("No memory available");
return 2;
}
list->head=NULL;
list->tail=NULL;
if (argc==1) {
printf("No files entered");
return 1;
} else if (argc==2) {
printf("Text file entered but no binary file entered");
return 1;
}
else {
printf("Reading file");
read_file(&list, argv[1]);
}
strcpy(newP->filename,argv[2]);
newP->listpar=list;
printf("About to create");
pthread_create(&thr, NULL, autosaver,(void *)newP);
int whileLoop=0;
int tempnumber;
char tempName[20];
while (whileLoop==0) {
newP->listpar=list;
int selection;
printf("\nPick an option:1)Add New Party 2)Enter Open Table Size 3)Show Text List 4)Show Binary Autosave 5)Quit: ");
scanf("%d",&selection);
NODE *new=list->head;
switch(selection) {
case 1:
printf("\nWhat is the name of the party? ");
scanf("%s",tempName);
printf("\nWhat is the size of the party? ");
scanf("%d",&tempnumber);
pthread_mutex_lock(&mutex);
add(&list,tempName,tempnumber);
pthread_mutex_unlock(&mutex);
break;
case 2:
pthread_mutex_lock(&mutex);
delete(&list);
pthread_mutex_unlock(&mutex);
break;
case 3:
pthread_mutex_lock(&mutex);
show(&list);
pthread_mutex_unlock(&mutex);
break;
case 4:
pthread_mutex_lock(&mutex);
dispbin(argv[argc-1],&list);
pthread_mutex_unlock(&mutex);
break;
case 5:
pthread_cancel(thr);
if ((in=fopen(argv[argc-2],"w"))==NULL) {
printf("File not found");
return 3;
}
fprintf(in, "Name Group Size\n-------------\n");
while (new!=NULL) {
//printf("Hi2");
fprintf(in,"%s %d\n",new->name,new->number);
new=new->next;
}
fclose(in);
whileLoop=1;
break;
default:
printf("\nWhat is the name of the party? ");
scanf("%s",tempName);
printf("\nWhat is the size of the party? ");
scanf("%d",&tempnumber);
pthread_mutex_lock(&mutex);
add(&list,tempName,tempnumber);
pthread_mutex_unlock(&mutex);
break;
}
}
}
void read_file(LIST **list, char *in) {
printf("%s",in);
printf("Start of read function");
printf("\n");
int seats;
char name[20];
FILE *infp;
if ((infp=fopen(in,"r"))==NULL) {
printf("File not found\n");
return;
}
printf("Opened");
fseek(infp, sizeof(char)*strlen("Name Group Size\n-------------"),SEEK_SET);
printf("Seeked");
while (fscanf(infp,"%s %d",name,&seats)!=EOF) {
add(list, name,seats);
}
fclose(infp);
printf("End of read function");
return;
}
LIST * add(LIST **list, char *fake, int fakenumber) {
printf("\n");
NODE *new;
NODE *temp;
if ((new=(NODE *)malloc(sizeof(NODE)))==NULL) {
printf("No memory!");
return *list;
}
if ((*list)->head==NULL) {
strcpy(new->name,fake);
new->number=fakenumber;
(*list)->head=new;
(*list)->tail=new;
new->next=NULL;
return *list;
}
temp=(*list)->head;
while (temp!=NULL) {
if (strcmp(fake,temp->name)==0) {
printf("Name already taken");
return *list;
}
temp=temp->next;
}
if ((new=(NODE *)malloc(sizeof(NODE)))==NULL) {
printf("No memory");
return *list;
}
strcpy(new->name,fake);
new->number=fakenumber;
(*list)->tail->next=new;
(*list)->tail=new;
new->next=NULL;
return *list;
}