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38 lines
1.3 KiB
Scheme
38 lines
1.3 KiB
Scheme
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu build bootloader)
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#:use-module (ice-9 binary-ports)
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#:export (write-file-on-device))
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;;;
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;;; Writing utils.
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;;;
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(define (write-file-on-device file size device offset)
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"Write SIZE bytes from FILE to DEVICE starting at OFFSET."
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(call-with-input-file file
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(lambda (input)
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(let ((bv (get-bytevector-n input size)))
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(call-with-output-file device
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(lambda (output)
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(seek output offset SEEK_SET)
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(put-bytevector output bv))
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#:binary #t)))))
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