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;;; srfi-60.scm --- Integers as Bits
;; Copyright (C) 2005, 2006, 2010 Free Software Foundation, Inc.
;;
;; This library is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public
;; License as published by the Free Software Foundation; either
;; version 3 of the License, or (at your option) any later version.
;;
;; This library is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; Lesser General Public License for more details.
;;
;; You should have received a copy of the GNU Lesser General Public
;; License along with this library; if not, write to the Free Software
;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
(define-module (srfi srfi-60)
#:export (bitwise-and
bitwise-ior
bitwise-xor
bitwise-not
any-bits-set?
bitwise-if bitwise-merge
log2-binary-factors first-set-bit
bit-set?
copy-bit
bit-field
copy-bit-field
arithmetic-shift
rotate-bit-field
reverse-bit-field
integer->list
list->integer
booleans->integer)
#:replace (bit-count)
#:re-export (logand
logior
logxor
integer-length
logtest
logcount
logbit?
ash))
(load-extension (string-append "libguile-" (effective-version))
"scm_init_srfi_60")
(define bitwise-and logand)
(define bitwise-ior logior)
(define bitwise-xor logxor)
(define bitwise-not lognot)
(define any-bits-set? logtest)
(define bit-count logcount)
(define (bitwise-if mask n0 n1)
(logior (logand mask n0)
(logand (lognot mask) n1)))
(define bitwise-merge bitwise-if)
(define first-set-bit log2-binary-factors)
(define bit-set? logbit?)
(define bit-field bit-extract)
(define (copy-bit-field n newbits start end)
(logxor n (ash (logxor (bit-extract n start end) ;; cancel old
(bit-extract newbits 0 (- end start))) ;; insert new
start)))
(define arithmetic-shift ash)
(cond-expand-provide (current-module) '(srfi-60))