Thread: Getting a seg fault

This is driving me nuts! I dont know much about C so I cant find what I am doing wrong but I have debugged it to the point that I know where I am getting a Seg. Fault but dont know why:

Code:

void parse_string(char input_string[])  
{
  char *token;
  char *delim = " ";

  token = strtok(input_string,delim);
  while (token != NULL)
   {
    token = strtok(NULL, delim);
   }

  return 0;
}                                                                      
//------------------------
int main() {
  int x = 0;                       //holds answer from calculations
  char *buf;                       //pointer to where the directory is
  long size;                       //size of the array, which is the directory name
  char *dir;                       //this is the variable that stores the direcory name and then prints it
  char *path;                      //this is the array that will hold the changed directory's name
  char input_string[maxbuf];       //this is the array which will hold the input
  int flag = 1;
  int pipecount = 0;
  
  signal(SIGTSTP, signal_handler);                        //called when the user hit ctrl-z
      printf("mysh$>");
      if ((buf = (char *)malloc((size_t)size)) != NULL)
        dir = getcwd(buf, size);                          //this is the call to get the directory
      printf("%s >", dir);                                //will print the directory
      fgets (input_string, maxbuf, stdin);                //this will get the command the user enters
      parse_string(input_string);                         //tokenizes the command the user enters

        if(strcmp(command[0], "cd") == 0);  {              //SEG FAULT HERE!!!!!!
          dir = chdir(path);
          printf("%s%", dir);  }                            //SEG FAULT HERE!!!!!!
        if (strcmp(command[0], "quit" == 0))
          exit(0);
      // else if (strcmp(command[0], "list" == 0)
      //   command[0] = "ls";
      // else if (strcmp(command[0], "type" == 0)
      //   command[0] = "cat";
      // else if (strcmp(command[0], "cls" == 0)
      //   command[0] = "clear";
      // else if (strcmp(command[0], "move" == 0)
      //   command[0] = "mv";
      // else if (strcmp(command[0], "copy" == 0)
      //   command[0] = "cp";
      // else if (strcmp(command[0], "del" == 0)
      //   command[0] = "rm";
      // else if (strcmp(command[0], "=" == 0){
        // x = arith(command);
        // printf("%s", x); }
      // else
      // printf("Bad Command.  Please try again.");
                                                                         
      execvp(command[0], command);                              //execute the commands

  return 0;
}

Basically I have other things commented because I am trying to just get at least one or two things to work! Ahhhh! ok so this is am implementation of a Shell program. I want to type cd in and have it go back one directory, naturally. Or quit when I type quit in. I can type something in and once I hit enter it seg faults. In the code in my comments it shows where the seg faults occur. Please help! Thanks!