/usr/share/common-lisp/source/chunga/util.lisp is in cl-chunga 1.1.6-1.
This file is owned by root:root, with mode 0o644.
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;;; $Header: /usr/local/cvsrep/chunga/util.lisp,v 1.12 2008/05/25 10:53:48 edi Exp $
;;; Copyright (c) 2006-2010, Dr. Edmund Weitz. All rights reserved.
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;; * Redistributions in binary form must reproduce the above
;;; copyright notice, this list of conditions and the following
;;; disclaimer in the documentation and/or other materials
;;; provided with the distribution.
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(in-package :chunga)
#-:lispworks
(defmacro when-let ((var expr) &body body)
"Evaluates EXPR, binds it to VAR, and executes BODY if VAR has
a true value."
`(let ((,var ,expr))
(when ,var ,@body)))
(defun ends-with-p (seq suffix &key (test #'char-equal))
"Returns true if the sequence SEQ ends with the sequence
SUFFIX. Individual elements are compared with TEST."
(let ((mismatch (mismatch seq suffix :from-end t :test test)))
(or (null mismatch)
(= mismatch (- (length seq) (length suffix))))))
(defun make-keyword (string destructivep)
"Converts the string STRING to a keyword where all characters are
uppercase or lowercase, taking into account the current readtable
case. Destructively modifies STRING if DESTRUCTIVEP is true."
(intern (funcall
(if destructivep
(if (eq (readtable-case *readtable*) :upcase)
#'nstring-upcase
#'nstring-downcase)
(if (eq (readtable-case *readtable*) :upcase)
#'string-upcase
#'string-downcase))
string)
:keyword))
(defun read-char* (stream &optional (eof-error-p t) eof-value)
"The streams we're dealing with are all binary with element type
\(UNSIGNED-BYTE 8) and we're only interested in ISO-8859-1, so we use
this to `simulate' READ-CHAR."
(cond (*char-buffer*
(prog1 *char-buffer*
(setq *char-buffer* nil)))
(t
;; this assumes that character codes are identical to Unicode code
;; points, at least for Latin1
(let ((char-code (read-byte stream eof-error-p eof-value)))
(and char-code
(code-char char-code))))))
(defun unread-char* (char)
"Were simulating UNREAD-CHAR by putting the character into
*CHAR-BUFFER*."
;; no error checking, only used internally
(setq *char-buffer* char)
nil)
(defun peek-char* (stream &optional eof-error-p eof-value)
"We're simulating PEEK-CHAR by reading a character and putting it
into *CHAR-BUFFER*."
;; no error checking, only used internally
(setq *char-buffer* (read-char* stream eof-error-p eof-value)))
(defmacro with-character-stream-semantics (&body body)
"Binds *CHAR-BUFFER* around BODY so that within BODY we can use
READ-CHAR* and friends \(see above) to simulate a character stream
although we're reading from a binary stream."
`(let ((*char-buffer* nil))
,@body))
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