campo-sirio/cb5/list2.c

/***********************************************************************\
 *                                                                       *
 *   LIST2.C    Copyright (C) 1993 Sequiter Software Inc.             *
 *                                                                       *
 \***********************************************************************/
/* See User's Manual, page 169 */

#include "d4all.h"

#ifdef __TURBOC__
extern unsigned _stklen = 10000;
#endif

typedef struct
{
  LINK4   link;
  int     age;
} AGES;

void print_list(LIST4 *);
AGES *add_age(LIST4 *,int);
void remove_age(LIST4 *,AGES *);
void free_ages(LIST4 *);

void main()
{

  LIST4   age_list;
  AGES    *age_ptr;

  memset(&age_list,0,sizeof(age_list));

  add_age(&age_list,3);
  age_ptr = add_age(&age_list,5);
  add_age(&age_list,7);
  add_age(&age_list,6);
  add_age(&age_list,2);

  age_list.selected = age_ptr;

  print_list(&age_list);

  remove_age(&age_list,age_ptr);

  print_list(&age_list);

  free_ages(&age_list);

  print_list(&age_list);
}


void print_list(LIST4 *list)
{
  AGES    *age_ptr;

  printf("\nThere are %d links\n",list->n_link);

  age_ptr = (AGES *) l4first(list);
  while(age_ptr != NULL)
  {
    printf("%d\n",age_ptr->age);
    age_ptr = (AGES *) l4next(list,age_ptr);
  }

}


AGES *add_age(LIST4 *list,int age)
{
  AGES* age_ptr;

  age_ptr = (AGES *) u4alloc(sizeof(AGES));

  age_ptr->age = age;
  l4add(list,age_ptr);

  return(age_ptr);
}

void remove_age(LIST4 *list,AGES *age_ptr)
{
  l4remove(list,age_ptr);
  u4free(age_ptr);
}

void free_ages(LIST4 *list)
{
  AGES *age_ptr;

  while( (age_ptr = (AGES *) l4pop(list)) )
    u4free(age_ptr);

}