21.1.3 Stream Arguments to Standardized Functions

The operators in the next figure accept stream arguments that might be either open or closed streams.

broadcast-stream-streams     file-author       pathnamep                     
close                        file-namestring   probe-file                    
compile-file                 file-write-date   rename-file                   
compile-file-pathname        host-namestring   streamp                       
concatenated-stream-streams  load              synonym-stream-symbol         
delete-file                  logical-pathname  translate-logical-pathname    
directory                    merge-pathnames   translate-pathname            
directory-namestring         namestring        truename                      
dribble                      open              two-way-stream-input-stream   
echo-stream-input-stream     open-stream-p     two-way-stream-output-stream  
echo-stream-ouput-stream     parse-namestring  wild-pathname-p               
ed                           pathname          with-open-file                
enough-namestring            pathname-match-p                                

Figure 21-7. Operators that accept either Open or Closed Streams

The operators in the next figure accept stream arguments that must be open streams.

clear-input               output-stream-p          read-char-no-hang           
clear-output              peek-char                read-delimited-list         
file-length               pprint                   read-line                   
file-position             pprint-fill              read-preserving-whitespace  
file-string-length        pprint-indent            stream-element-type         
finish-output             pprint-linear            stream-external-format      
force-output              pprint-logical-block     terpri                      
format                    pprint-newline           unread-char                 
fresh-line                pprint-tab               with-open-stream            
get-output-stream-string  pprint-tabular           write                       
input-stream-p            prin1                    write-byte                  
interactive-stream-p      princ                    write-char                  
listen                    print                    write-line                  
make-broadcast-stream     print-object             write-string                
make-concatenated-stream  print-unreadable-object  y-or-n-p                    
make-echo-stream          read                     yes-or-no-p                 
make-synonym-stream       read-byte                                            
make-two-way-stream       read-char                                            

Figure 21-8. Operators that accept Open Streams only