@c -*-texinfo-*-
@c This is part of the GNU Emacs Lisp Reference Manual.
-@c Copyright (C) 1990-1994, 1998-1999, 2001-2012 Free Software Foundation, Inc.
+@c Copyright (C) 1990-1994, 1998-1999, 2001-2015 Free Software
+@c Foundation, Inc.
@c See the file elisp.texi for copying conditions.
-@node Read and Print, Minibuffers, Debugging, Top
-@comment node-name, next, previous, up
+@node Read and Print
@chapter Reading and Printing Lisp Objects
@dfn{Printing} and @dfn{reading} are the operations of converting Lisp
should save the argument and arrange to return it on the next call.
This is called @dfn{unreading} the character; it happens when the Lisp
reader reads one character too many and wants to ``put it back where it
-came from.'' In this case, it makes no difference what value
+came from''. In this case, it makes no difference what value
@var{function} returns.
@end itemize
@code{t}.
@end defvar
+@cindex binary I/O in batch mode
+When reading or writing from the standard input/output streams of the
+Emacs process in batch mode, it is sometimes required to make sure any
+arbitrary binary data will be read/written verbatim, and/or that no
+translation of newlines to or from CR-LF pairs are performed. This
+issue does not exist on Posix hosts, only on MS-Windows and MS-DOS.
+The following function allows to control the I/O mode of any standard
+stream of the Emacs process.
+
+@defun set-binary-mode stream mode
+Switch @var{stream} into binary or text I/O mode. If @var{mode} is
+non-@code{nil}, switch to binary mode, otherwise switch to text mode.
+The value of @var{stream} can be one of @code{stdin}, @code{stdout},
+or @code{stderr}. This function flushes any pending output data of
+@var{stream} as a side effect, and returns the previous value of I/O
+mode for @var{stream}. On Posix hosts, it always returns a
+non-@code{nil} value and does nothing except flushing pending output.
+@end defun
+
@node Output Streams
@section Output Streams
@cindex stream (for printing)
@end example
@end defun
-@defun terpri &optional stream
+@defun terpri &optional stream ensure
@cindex newline in print
-This function outputs a newline to @var{stream}. The name stands
-for ``terminate print.''
+This function outputs a newline to @var{stream}. The name stands for
+``terminate print''. If @var{ensure} is non-@code{nil} no newline is printed
+if @var{stream} is already at the beginning of a line. Note in this
+case @var{stream} can not be a function and an error is signalled if
+it is. This function returns @code{t} if a newline is printed.
@end defun
@defun write-char character &optional stream
indent and fill the object to make it more readable for humans.
@end defun
+If you need to use binary I/O in batch mode, e.g., use the functions
+described in this section to write out arbitrary binary data or avoid
+conversion of newlines on non-Posix hosts, see @ref{Input Functions,
+set-binary-mode}.
+
@node Output Variables
@section Variables Affecting Output
@cindex output-controlling variables
@defvar print-quoted
If this is non-@code{nil}, that means to print quoted forms using
-abbreviated reader syntax, e.g.@: @code{(quote foo)} prints as
+abbreviated reader syntax, e.g., @code{(quote foo)} prints as
@code{'foo}, and @code{(function foo)} as @code{#'foo}.
@end defvar
If non-@code{nil}, that means number continuously across print calls.
This affects the numbers printed for @samp{#@var{n}=} labels and
@samp{#@var{m}#} references.
-
Don't set this variable with @code{setq}; you should only bind it
temporarily to @code{t} with @code{let}. When you do that, you should
also bind @code{print-number-table} to @code{nil}.
@end defvar
@defvar float-output-format
-This variable specifies how to print floating point numbers. Its
-default value is @code{nil}, meaning use the shortest output
+This variable specifies how to print floating-point numbers. The
+default is @code{nil}, meaning use the shortest output
that represents the number without losing information.
To control output format more precisely, you can put a string in this