[time[ use pointer struct

#include <stdio.h>
#include<stdlib.h>
#include <time.h>
typedef struct TIME
{
    int t_hour;
    int t_min;
    int t_sec;
};
void t_printf(TIME *t)
{
    if(t==NULL)
        return;
    printf("%d : ",t->t_hour);
    printf("%d : ",t->t_min);
    printf("%d\n", t->t_sec);
}
TIME *t_sub(TIME *t2, TIME *t1)
{
    TIME *tmp;
    int m_esp, h_espf, s_esp, m_espf;
    m_esp = h_espf = s_esp = m_espf = 0;

    tmp = (TIME *)malloc(sizeof(TIME));

    if( (t2->t_hour < t1->t_hour) || (t2->t_hour == t1->t_hour && t2->t_min < t1->t_min) ||
        (t2->t_hour == t1->t_hour && t2->t_min == t1->t_min && t2->t_sec < t1->t_sec))
        return NULL;
    if(t2->t_min < t1->t_min)
    {
        m_esp = 60;
        h_espf = -1;
    }
    if(t2->t_sec < t1->t_sec)
    {
        s_esp = 60;
        m_espf = -1;
    }
    tmp->t_hour = t2->t_hour - t1->t_hour + h_espf;
    tmp->t_min = t2->t_min - t1->t_min + m_esp + m_espf;
    tmp->t_sec = t2->t_sec - t1->t_sec + s_esp;

    return tmp;
}
int main ()
{
   time_t rawtime;
   struct tm *info;
   char buffer[80];
   TIME * t_pointer;
   TIME * t_pointer2;
   TIME * t_pointer3;
   t_pointer = (TIME *)malloc(sizeof(TIME));
   t_pointer2 = (TIME *)malloc(sizeof(TIME));
   t_pointer3 = (TIME *)malloc(sizeof(TIME));

   t_pointer2->t_hour = 12;
   t_pointer2->t_min = 00;
   t_pointer2->t_sec = 00;

   time( &rawtime );
   info = localtime( &rawtime );
   t_pointer->t_hour = info->tm_hour;
   t_pointer->t_min = info->tm_min;
   t_pointer->t_sec = info->tm_sec;
   //t_printf(t_pointer);

   t_pointer3 = t_sub(t_pointer2, t_pointer);
   t_printf(t_pointer3);

   free(t_pointer);
   free(t_pointer2);
   free(t_pointer3);
   //printf("Current local second: %d\n", info->tm_hour);
   system("pause");
   return(0);
}