Thread: extract words from a text file and save them to a linked list

^​i have a problem in my code. I want to read lines from a text file and split the line into words and save each word to a linked list. In main method first i am calling the init_list function to init the list, next i am calling the open_file function to open a file and reading line by line until i get to the end of file. Each time i read a line i am calling stringtoken function to split the line into words. Now in stringtoken function have a printf to print each word and works fine , is printing the word that has to be printed, after that i am calling the list_add function to add the words in a linked list. When all these are done in main method i am calling function print_list to print the elements of the list but is printing garbage. I can not understand why print_list is printing garbage. here is my code:

Code:

#include <stdlib.h> 
#include <string.h> 
#include <time.h> 
#include <stdio.h>


struct list {
  char  *val;
  struct list *next;
};
struct list *root;    
struct list *head;
FILE *f;
int node_counter=0;


int main(char *argv[],int argc){
 int i;
 
 i=init_list();
 open_file();
 print_list(head);
 return(0);
 
}  


int init_list(){
  node_counter=0;
  root=(struct list *)malloc(sizeof(struct list));
  if(root==NULL ){
    printf("Init list failed\n");
    return(1);
  }
    root->next=NULL;
    
    return(0);
  
}
//insert a node at the end of the list
int list_add(char *string){
  struct list *curr;
  curr = (struct list *)malloc(sizeof(struct list));
  if(curr==NULL){
    printf("Adding to a list failed\n");
    return(1);
  }
  
  if(node_counter==0)
    head=curr;


  curr->val=string;
  root->next=curr;
  curr->next=NULL;
  root=curr;
  node_counter++;
  return(0);
}
void print_list (struct list * head) {
    struct list * ptr =head;
    while(ptr!=NULL){
        printf("%s ", ptr->val);
        ptr=ptr->next;
    }
    printf("\n");
}
int stringtoken (char str[])
{
  char * pch;
  pch = strtok (str," ,.-");
  while (pch != NULL)
  {
    print_list(head);
    list_add(pch);
    pch = strtok (NULL, " ,.-");
  }
  return 0;
}
open_file(){
  char fname[60];
  char line [ 128 ];
  printf("Give the name of the file\n");
  scanf("%s",fname);


  f=fopen(fname,"r");
     if ( f!= NULL )
   {
      while ( fgets ( line, sizeof line, f ) != NULL ) /* read a line */
      {
    stringtoken(line);    //split line to tokens
      }
      fclose ( f );
   }
   else
   {
      printf("ERROR OPENING THE FILE");
      return(1);
   }
   return 0;
}