Thread: Help with singly link list....

I have researched all over the internet yet I cannot figure out why this code doesn't work. Any suggestions and instructions on how to fix the problems will be greatly appreciated.

Code:

#define _GNU_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/wait.h>

typedef enum
{
   FALSE = 0,
   TRUE = 1
} Bool;

struct node
{
   char *x;
   struct node *next;
};

struct node *tptr = NULL, *cptr = NULL;
void addNode(char *input);

int main()
{
   ssize_t readReturn = 0;
   size_t bufLen = 0;
   char *input;
   int x = 0;
   Bool stillGoing = TRUE;

   while(stillGoing)
   {
     printf("enter text: ");

     readReturn = getline(&input, &bufLen, stdin);

     for(x = 0; x < strlen(input) + 1; ++x)
     {
        if(input[x] == '\n')
        {
           input[x] = '\0';
        }
     }

     if((strncmp(input,"exit",4)) == 0)
     {
        stillGoing = FALSE;
        break;
     }
     addNode(input);

   }

   if(tptr!=NULL)
   {
      for(cptr = tptr; cptr != NULL; cptr = cptr->next)
      printf("%s\n", cptr->x);
   }
   /*for some reason tptr is ALWAYS null at this point*/
   else
      printf("something isn't right\n");
   
   /*i know these frees arent complete i have yet to code this part*/
   free(cptr);
   free(tptr);
   free(input);
   return 0;
}

void addNode(char *input)
{
   struct node *nptr;
   cptr = tptr;

   if ((nptr = malloc(sizeof(struct node))) != NULL)
   {
      nptr->x = input;
      nptr->next = NULL;

      if(tptr == NULL)
      {
         tptr = nptr;
      }
      else
      {
         while(cptr->next != NULL)
         {
            cptr = cptr->next;
         }
         cptr->next = malloc(sizeof(struct node));
         cptr->next = nptr;
      }
   }
   else
   {
      fprintf(stderr, "%s", "Not enough memory.\n");
      exit(EXIT_FAILURE);
   }
}

thanks for your help.

**edit
i fixed the tptr always being null problem. I accidently made tptr and cptr local variables. But im getting the output:

exit
exit

when it tries to list the contents of the list.

http://cboard.cprogramming.com/showthread.php?t=70616
Amount of prior knowledge transferred - 0%

Sorry, I can't be bothered to spend another 20 minutes writing a bunch of words explaining the issues (yes, you have the whole bloody subscription there) you have with your code just for you to blindly ignore it all again.

Guess your nickname finally caught up with you - turn off the light and put down the compiler.

Don't you need <stdbool.h>?