🚀 go-pugleaf

Oops. Your interpretation of Stroustrup looks correct. Here are the fixes.
(The same counting errors occurred in a couple of places)

g.oswego.edu% cd libg++/src
g.oswego.edu% diff -rc2N stream.cc~ stream.cc
*** stream.cc~	Sun Jul 16 09:26:11 1989
--- stream.cc	Sun Aug  6 07:15:24 1989
***************
*** 321,325 ****
    char ch = 0;
    
!   if (n > 0 && get(ch))
    {
      if (ch == terminator) 
--- 321,325 ----
    char ch = 0;
    
!   if (--n > 0 && get(ch))
    {
      if (ch == terminator) 
***************
*** 328,332 ****
      {
        *s++ = ch; --n;
!       while (n-- >= 0 && get(ch))
        {
          if (ch == terminator)
--- 328,332 ----
      {
        *s++ = ch; --n;
!       while (n-- > 0 && get(ch))
        {
          if (ch == terminator)
***************
*** 387,391 ****
  
    char ch;
!   while (--n >= 0 && get(ch) && ((*s++ = ch) != terminator));
  
    *s = 0;
--- 387,391 ----
  
    char ch;
!   while (--n > 0 && get(ch) && ((*s++ = ch) != terminator));
  
    *s = 0;
g.oswego.edu% diff -rc2N File.cc~ File.cc
*** File.cc~	Thu Jul 20 09:57:26 1989
--- File.cc	Sun Aug  6 07:15:23 1989
***************
*** 379,383 ****
  
    char ch;
!   stat = n;
  
    if (n > 0 && (get(ch)))
--- 379,383 ----
  
    char ch;
!   stat = --n;
  
    if (n > 0 && (get(ch)))
***************
*** 418,422 ****
  
    char ch;
!   stat = n;
  
    while (n > 0 && (get(ch)))
--- 418,422 ----
  
    char ch;
!   stat = --n;
  
    while (n > 0 && (get(ch)))
g.oswego.edu%