Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / srfi / srfi-60.scm

diff --git a/guile18/srfi/srfi-60.scm b/guile18/srfi/srfi-60.scm
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+;;; srfi-60.scm --- Integers as Bits
+
+;; Copyright (C) 2005, 2006 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 2.1 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?
+           bit-count
+           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)
+  #:re-export (logand
+              logior
+              logxor
+              integer-length
+              logtest
+              logcount
+              logbit?
+              ash))
+
+(load-extension "libguile-srfi-srfi-60-v-2" "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))