#define NOCCARGC
extern char *_memptr;
/*
** Return the number of bytes of available memory and if abort,
** abort with S if there aren't any
*/
avail(abort) int abort; {
  char x;
  if(&x < _memptr) {
    if(abort) exit ('M');
    return (0);
    }
  return (&x - _memptr);
  }