strongly recommended that file ports be closed explicitly when no
longer required (@pxref{Ports}).
-@deffn {Scheme Procedure} open-file filename mode
+@deffn {Scheme Procedure} open-file filename mode @
+ [#:guess-encoding=#f] [#:encoding=#f]
+@deffnx {C Function} scm_open_file_with_encoding @
+ (filename, mode, guess_encoding, encoding)
@deffnx {C Function} scm_open_file (filename, mode)
Open the file whose name is @var{filename}, and return a port
representing that file. The attributes of the port are
because of its port encoding ramifications.
@end table
-If a file cannot be opened with the access
-requested, @code{open-file} throws an exception.
+Unless binary mode is requested, the character encoding of the new port
+is determined as follows: First, if @var{guess-encoding} is true, the
+@code{file-encoding} procedure is used to guess the encoding of the file
+(@pxref{Character Encoding of Source Files}). If @var{guess-encoding}
+is false or if @code{file-encoding} fails, @var{encoding} is used unless
+it is also false. As a last resort, the default port encoding is used.
+@xref{Ports}, for more information on port encodings. It is an error to
+pass a non-false @var{guess-encoding} or @var{encoding} if binary mode
+is requested.
+
+If a file cannot be opened with the access requested, @code{open-file}
+throws an exception.
When the file is opened, its encoding is set to the current
@code{%default-port-encoding}, unless the @code{b} flag was supplied.
@end deffn
@rnindex open-input-file
-@deffn {Scheme Procedure} open-input-file filename
-Open @var{filename} for input. Equivalent to
+@deffn {Scheme Procedure} open-input-file filename @
+ [#:guess-encoding=#f] [#:encoding=#f] [#:binary=#f]
+
+Open @var{filename} for input. If @var{binary} is true, open the port
+in binary mode, otherwise use text mode. @var{encoding} and
+@var{guess-encoding} determine the character encoding as described above
+for @code{open-file}. Equivalent to
@lisp
-(open-file @var{filename} "r")
+(open-file @var{filename}
+ (if @var{binary} "rb" "r")
+ #:guess-encoding @var{guess-encoding}
+ #:encoding @var{encoding})
@end lisp
@end deffn
@rnindex open-output-file
-@deffn {Scheme Procedure} open-output-file filename
-Open @var{filename} for output. Equivalent to
+@deffn {Scheme Procedure} open-output-file filename @
+ [#:encoding=#f] [#:binary=#f]
+
+Open @var{filename} for output. If @var{binary} is true, open the port
+in binary mode, otherwise use text mode. @var{encoding} specifies the
+character encoding as described above for @code{open-file}. Equivalent
+to
@lisp
-(open-file @var{filename} "w")
+(open-file @var{filename}
+ (if @var{binary} "wb" "w")
+ #:encoding @var{encoding})
@end lisp
@end deffn
-@deffn {Scheme Procedure} call-with-input-file filename proc
-@deffnx {Scheme Procedure} call-with-output-file filename proc
+@deffn {Scheme Procedure} call-with-input-file filename proc @
+ [#:guess-encoding=#f] [#:encoding=#f] [#:binary=#f]
+@deffnx {Scheme Procedure} call-with-output-file filename proc @
+ [#:encoding=#f] [#:binary=#f]
@rnindex call-with-input-file
@rnindex call-with-output-file
Open @var{filename} for input or output, and call @code{(@var{proc}
way if not otherwise referenced.
@end deffn
-@deffn {Scheme Procedure} with-input-from-file filename thunk
-@deffnx {Scheme Procedure} with-output-to-file filename thunk
-@deffnx {Scheme Procedure} with-error-to-file filename thunk
+@deffn {Scheme Procedure} with-input-from-file filename thunk @
+ [#:guess-encoding=#f] [#:encoding=#f] [#:binary=#f]
+@deffnx {Scheme Procedure} with-output-to-file filename thunk @
+ [#:encoding=#f] [#:binary=#f]
+@deffnx {Scheme Procedure} with-error-to-file filename thunk @
+ [#:encoding=#f] [#:binary=#f]
@rnindex with-input-from-file
@rnindex with-output-to-file
Open @var{filename} and call @code{(@var{thunk})} with the new port
Calls the one-argument procedure @var{proc} with a newly created output
port. When the function returns, the string composed of the characters
written into the port is returned. @var{proc} should not close the port.
-
-Note that which characters can be written to a string port depend on the port's
-encoding. The default encoding of string ports is specified by the
-@code{%default-port-encoding} fluid (@pxref{Ports,
-@code{%default-port-encoding}}). For instance, it is an error to write Greek
-letter alpha to an ISO-8859-1-encoded string port since this character cannot be
-represented with ISO-8859-1:
-
-@example
-(define alpha (integer->char #x03b1)) ; GREEK SMALL LETTER ALPHA
-
-(with-fluids ((%default-port-encoding "ISO-8859-1"))
- (call-with-output-string
- (lambda (p)
- (display alpha p))))
-
-@result{}
-Throw to key `encoding-error'
-@end example
-
-Changing the string port's encoding to a Unicode-capable encoding such as UTF-8
-solves the problem.
@end deffn
@deffn {Scheme Procedure} call-with-input-string string proc
Calls the zero-argument procedure @var{thunk} with the current output
port set temporarily to a new string port. It returns a string
composed of the characters written to the current output.
-
-See @code{call-with-output-string} above for character encoding considerations.
@end deffn
@deffn {Scheme Procedure} with-input-from-string string thunk
* R6RS Textual Output:: Textual output.
@end menu
-A subset of the @code{(rnrs io ports)} module is provided by the
-@code{(ice-9 binary-ports)} module. It contains binary input/output
-procedures and does not rely on R6RS support.
+A subset of the @code{(rnrs io ports)} module, plus one non-standard
+procedure @code{unget-bytevector} (@pxref{R6RS Binary Input}), is
+provided by the @code{(ice-9 binary-ports)} module. It contains binary
+input/output procedures and does not rely on R6RS support.
@node R6RS File Names
@subsubsection File Names
end-of-file object (if no data were available).
@end deffn
+The @code{(ice-9 binary-ports)} module provides the following procedure
+as an extension to @code{(rnrs io ports)}:
+
+@deffn {Scheme Procedure} unget-bytevector port bv [start [count]]
+@deffnx {C Function} scm_unget_bytevector (port, bv, start, count)
+Place the contents of @var{bv} in @var{port}, optionally starting at
+index @var{start} and limiting to @var{count} octets, so that its bytes
+will be read from left-to-right as the next bytes from @var{port} during
+subsequent read operations. If called multiple times, the unread bytes
+will be read again in last-in first-out order.
+@end deffn
+
@node R6RS Textual Input
@subsubsection Textual Input
file, the end-of-file object is returned.
@end deffn
-@deffn {Scheme Procedure} get-string-all textual-input-port count
+@deffn {Scheme Procedure} get-string-all textual-input-port
Reads from @var{textual-input-port} until an end of file, decoding
characters in the same manner as @code{get-string-n} and
@code{get-string-n!}.
@deffn {Scheme Procedure} put-char port char
Writes @var{char} to the port. The @code{put-char} procedure returns
+an unspecified value.
@end deffn
@deffn {Scheme Procedure} put-string port string
HCoop / bpt / guile.git / blobdiff