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;;;; "Link.scm", Dynamic linking/loading code for SCM.
;; 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 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 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
;; Lesser General Public License for more details.
;;
;; You should have received a copy of the GNU Lesser General Public
;; License along with this program. If not, see
;; <http://www.gnu.org/licenses/>.
;;; Author: Aubrey Jaffer.
(cond
((defined? dyn:link)
(define link:able-suffix
(cond ((provided? 'shl) ".sl")
((provided? 'sun-dl) ".so")
((provided? 'mac-dl) ".shlb")
((provided? 'win32-dl) ".dll")
(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)
(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))
(if (and (provided? 'sun-dl)
(< 3 sl)
(not (eqv? (string-ref file 0) '#\/)))
(set! file (string-append "./" file)))
(with-load-pathname file
(lambda ()
(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) #f)
((dyn:call (file->init_name name) linkobj) #t)
(else (dyn:unlink linkobj) #f))))))))
((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)))))
(with-load-pathname file
(lambda () (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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