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target-extensions.lisp    66 lines (57 with data), 2.5 kB

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;;;; This file contains things for the extensions package which can't
;;;; be built at cross-compile time, and perhaps also some things
;;;; which might as well not be built at cross-compile time because
;;;; they're not needed then. Things which can't be built at
;;;; cross-compile time (e.g. because they need machinery which only
;;;; exists inside SBCL's implementation of the LISP package) do not
;;;; belong in this file.
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!IMPL")
;;;; miscellaneous I/O
;;; INDENTING-FURTHER is a user-level macro which may be used to locally
;;; increment the indentation of a stream.
(defmacro indenting-further (stream more &rest body)
#!+sb-doc
"Causes the output of the indenting Stream to indent More spaces. More is
evaluated twice."
`(unwind-protect
(progn
(incf (sb!impl::indenting-stream-indentation ,stream) ,more)
,@body)
(decf (sb!impl::indenting-stream-indentation ,stream) ,more)))
(defun skip-whitespace (&optional (stream *standard-input*))
(loop (let ((char (read-char stream)))
(unless (sb!impl::whitespacep char)
(return (unread-char char stream))))))
;;; like LISTEN, but any whitespace in the input stream will be flushed
(defun listen-skip-whitespace (&optional (stream *standard-input*))
(do ((char (read-char-no-hang stream nil nil nil)
(read-char-no-hang stream nil nil nil)))
((null char) nil)
(cond ((not (whitespace-char-p char))
(unread-char char stream)
(return t)))))
;;;; helpers for C library calls
;;; Signal a SIMPLE-CONDITION/ERROR condition associated with an ANSI C
;;; errno problem, arranging for the condition's print representation
;;; to be similar to the ANSI C perror(3) style.
(defun simple-perror (prefix-string
&key
(errno (get-errno))
(simple-error 'simple-error)
other-condition-args)
(declare (type symbol simple-error))
(aver (subtypep simple-error 'simple-condition))
(aver (subtypep simple-error 'error))
(apply #'error
simple-error
:format-control "~@<~A: ~2I~_~A~:>"
:format-arguments (list prefix-string (strerror errno))
other-condition-args))