Thread: getch and ungetch without buffer

Hi,

I want to have getch() and ungetch() without a static buffer.
What I have to change in following code from K&R to get that?

Code:

#define BUFSIZE 100

   char buf[BUFSIZE];    /* buffer for ungetch */
   int bufp = 0;         /* next free position in buf */

   int getch(void)  /* get a (possibly pushed-back) character */
   {
       return (bufp > 0) ? buf[--bufp] : getchar();
   }

   void ungetch(int c)   /* push character back on input */
   {
       if (bufp >= BUFSIZE)
           printf("ungetch: too many characters\n");
       else
           buf[bufp++] = c;
   }