/* test_list_str.c   simple use of "list" functions                      */

/* function prototypes for functions to be written in assembly language: */
void clear(int *L);               /* initialize list to empty            */
void print(int *L);               /* print the strings, one per line     */
void push_front(int *L, char *s); /* put string s on front of list       */
void push_back(int *L, char *s);  /* put string s on back of list        */
void pop_front(int *L);           /* remove string from front of list    */
void pop_back(int *L);            /* remove string from back of list     */

/* The assembly language program must be in a single file  list.asm      */
/* The following sequence of commands must run correctly on linux.gl     */
/* nasm -f elf list.asm                                                  */
/* gcc -o test_list_str.c list.o                                         */
/* test_list_str                                                         */
/* partial credit based on how far it executes before segfault or error  */

int main()
{
  int L1[2];             /* allocate space for two pointers for list L1 */
  int L2[2];             /* allocate space for two pointers for list L2 */
  char hello[]="Hello";  /* just a string for use later */

  clear(L1);             /* address of L1, space for two pointers */
  print(L1);             /* should print blank line */
  push_back(L1,"front");
  print(L1);             /* 25% of project credit */ 
  push_back(L1,"middle");
  print(L1);
  push_back(L1,"last");
  print(L1);             /* 50% of project credit */

  clear(L2);   
  push_front(L2, "end");
  print(L2);
  push_front(L2, "center");
  push_front(L2, "start");
  print(L2);             /* 75% of project credit */
  
  pop_front(L1);         /* removes first item on list */
  pop_back(L1);          /* removes last item on list */
  print(L1);             /* 90% of project credit */

  push_front(L1, hello);
  hello[0]='g';
  hello[1]='o';
  hello[2]='o';
  hello[3]='d';
  hello[4]=' ';
  push_back(L1, hello);
  print(L1);
  print(L2);             /* 100% of project credit */
  
  return 0;
}
/* Output of this program is:

front

front
middle

front
middle
last

end

start
center
end

middle

Hello
middle
good 

start
center
end

*/