From: ts <decoux@...>
Date: 2001-04-05T21:01:01+09:00
Subject: [ruby-talk:13510] Re: BUG?: HP-UX 10.20 and IO#gets followed 	by IO#puts

>>>>> "S" == SHULTZ,BARRY (HP-Israel,ex1) <barry_shultz@hp.com> writes:

S> If it's normal, though, why are the results different on HP-UX and NT?

 Does NT follow a standard ? :-)

 More seriously, look at fopen(3) and particulary at this paragraph (it's
 from Solaris but probably you have the same on HP-UX)

     When a file is opened with update mode (+ as the  second  or
     third character in the mode argument), both input and output
     may be performed on the associated stream.  However,  output
     must   not   be   directly  followed  by  input  without  an
     intervening call to fflush(3S)  or  to  a  file  positioning
     function ( fseek(3S), fsetpos(3S) or rewind( 3S)), and input
                                                        ^^^^^^^^
     must not be directly followed by output without an interven-
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     ing  call  to  a file positioning function, unless the input
     operation encounters end-of-file.
 
 In your case, if you add "f.eof?" it will work, because in this case it
 will encounters end-of-file

 I think this is required by ANSI-C (not really sure)


Guy Decoux