/* The C Programming Language. 2nd Edition
   Brian Kernighan, Dennis Ritchie
   Prentice-Hall
 */

#include <stdarg.h>

/* minprintf: minimal printf with variable argument list */
void minprintf(char *fmt, ...)
{
  va_list ap; /* points to each unnamed arg in turn */
  char *p, *sval ;
  int ival ;
  double dval ;

  va_start(ap, fmt); /* make ap point to first unnamed arg */
  for (p=fmt; *p; p++)
  {
    if (*p != '%'){
      putchar(*p);
      continue;
    }
    switch (*++p)
    {
      case 'd':
        ival = va_arg(ap, int);
        printf("%d", ival);
        break;

      case 'f':
        dval = va_arg(ap, double);
        printf("%f", dval);
        break;

      case 's':
        for (sval = va_arg(ap, char *); *sval; sval++) putchar(*sval);
        break ;

      default:
        putchar(*p);
        break;
    }
  }
  va_end(ap); /* cleanup when done */
}