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;; Copyright (C) 1993, 1994, 1995, 1997, 1998, 2002 Free Software Foundation, Inc.
;;
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;;
;; This program 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 General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this software; see the file COPYING. If not, write to
;; the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111, USA.
;;
;; As a special exception, the Free Software Foundation gives permission
;; for additional uses of the text contained in its release of SCM.
;;
;; The exception is that, if you link the SCM library with other files
;; to produce an executable, this does not by itself cause the
;; resulting executable to be covered by the GNU General Public License.
;; Your use of that executable is in no way restricted on account of
;; linking the SCM library code into it.
;;
;; This exception does not however invalidate any other reasons why
;; the executable file might be covered by the GNU General Public License.
;;
;; This exception applies only to the code released by the
;; Free Software Foundation under the name SCM. If you copy
;; code from other Free Software Foundation releases into a copy of
;; SCM, as the General Public License permits, the exception does
;; not apply to the code that you add in this way. To avoid misleading
;; anyone as to the status of such modified files, you must delete
;; this exception notice from them.
;;
;; If you write modifications of your own for SCM, it is your choice
;; whether to permit this exception to apply to your modifications.
;; If you do not wish that, delete this exception notice.
;;;; "Link.scm", Dynamic linking/loading code for SCM.
;;; Author: Aubrey Jaffer.
(cond
((defined? dyn:link)
(define link:able-suffix
(cond ((provided? 'shl) ".sl")
((provided? 'sun-dl) ".so")
((provided? 'mac-dl) ".shlb")
(else ".o")))
(define (file->init_name name)
(string-append
"init_"
(list->string
(map (lambda (chr) (if (eqv? #\- chr) #\_ chr))
(map char-downcase (string->list name))))))
(define link:link
(lambda (file . libs)
(define oloadpath *load-pathname*)
(let* ((sl (string-length file))
(lasl (string-length link:able-suffix))
(fname (let loop ((i (- sl 1)))
(cond ((negative? i) file)
((vicinity:suffix? (string-ref file i))
(substring file (+ i 1) sl))
(else (loop (- i 1))))))
(nsl (string-length fname))
(name (cond ((< nsl lasl) fname)
((string-ci=? (substring fname (- nsl lasl) nsl)
link:able-suffix)
(substring fname 0 (- nsl lasl)))
(else fname)))
(linkobj #f))
(set! *load-pathname* file)
(if (and (provided? 'sun-dl)
(< 3 sl)
(not (eqv? (string-ref file 0) '#\/)))
(set! file (string-append "./" file)))
(set! linkobj (or (provided? 'sun-dl) (dyn:link file)))
(and linkobj
(for-each (lambda (lib)
(or (dyn:link lib) (slib:error "couldn't link: " lib)))
libs))
(if (provided? 'sun-dl) (set! linkobj (dyn:link file)))
(cond ((not linkobj)
(set! *load-pathname* oloadpath) #f)
((dyn:call (file->init_name name) linkobj)
(set! *load-pathname* oloadpath) #t)
(else
(dyn:unlink linkobj)
(set! *load-pathname* oloadpath) #f)))))))
(cond
((defined? vms:dynamic-link-call)
(define link:able-suffix #f)
(define (link:link file)
(define dir "")
(define fil "")
(let loop ((i (- (string-length file) 1)))
(cond ((negative? i) (set! dir file))
((vicinity:suffix? (string-ref file i))
(set! dir (substring file 0 (+ i 1)))
(set! fil (substring file (+ i 1) (string-length file))))
(else (loop (- i 1)))))
(vms:dynamic-link-call dir fil (file->init_name fil)))))
(cond
((provided? 'sun-dl)
;; These libraries are (deferred) linked in conversion to ".so"
(define (usr:lib lib) #f)
(define (x:lib lib) #f))
((provided? 'shl)
(define (usr:lib lib)
(if (member lib '("c" "m"))
(string-append "/lib/lib" lib link:able-suffix)
(string-append "/usr/lib/lib" lib link:able-suffix)))
(define (x:lib lib) (string-append "/usr/X11R5/lib/lib"
lib link:able-suffix)))
((provided? 'dld:dyncm)
(define (usr:lib lib)
(or (and (member lib '("c" "m"))
(let ((sa (string-append "/usr/lib/lib" lib ".sa")))
(and (file-exists? sa) sa)))
(string-append "/usr/lib/lib" lib ".a")))
(define (x:lib lib) (string-append "/usr/X11/lib/lib" lib ".sa")))
((provided? 'dld)
(define (usr:lib lib) (string-append "/usr/lib/lib" lib ".a"))
(define (x:lib lib) (string-append "/usr/X11/lib/lib" lib ".sa"))))
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