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;; FFI interface for TinySCHEME.
;; Copyright (C) 2016 g10 Code GmbH
;;
;; This file is part of Libgpg-error.
;;
;; Libgpg-error 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.
;;
;; Libgpg-error 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 <https://www.gnu.org/licenses/>.
;; Foreign function wrapper. Expects F to return a list with the
;; first element being the `error_t' value returned by the foreign
;; function. The error is thrown, or the cdr of the result is
;; returned.
(define (ffi-apply name f args)
(let ((result (apply f args)))
(cond
((string? result)
(ffi-fail name args result))
((not (= (car result) 0))
(ffi-fail name args (strerror (car result))))
((and (= (car result) 0) (pair? (cdr result))) (cadr result))
((= (car result) 0) '())
(else
(throw (list "Result violates FFI calling convention: " result))))))
(define (ffi-fail name args message)
(let ((args' (open-output-string)))
(write (cons (string->symbol name) args) args')
(throw (get-output-string args') message)))
;; Pseudo-definitions for foreign functions. Evaluates to no code,
;; but serves as documentation.
(macro (ffi-define form))
;; Runtime support.
;; Low-level mechanism to terminate the process.
(ffi-define (_exit status))
;; Get the current time in seconds since the epoch.
(ffi-define (get-time))
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