futurile/guix-play
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

utils: 'dump-port' has an optional 'len' parameter.

Browse Source 
* guix/build/utils.scm (dump-port): Add optional 'len' parameter and
honor it.
This commit is contained in:
Ludovic Courtès 2020-08-27 22:52:26 +02:00
parent 0eb093b0ee
commit 24ce6e27bf
No known key found for this signature in database
GPG Key ID: 090B11993D9AEBB5
1 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
guix/build/utils.scm
View File

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2015, 2018 Mark H Weaver <mhw@netris.org>
@ -854,29 +854,38 @@ match the terminating newline of a line."
;;;
(define* (dump-port in out
#:optional len
#:key (buffer-size 16384)
(progress (lambda (t k) (k))))
"Read as much data as possible from IN and write it to OUT, using chunks of
BUFFER-SIZE bytes. Call PROGRESS at the beginning and after each successful
transfer of BUFFER-SIZE bytes or less, passing it the total number of bytes
transferred and the continuation of the transfer as a thunk."
"Read LEN bytes from IN or as much data as possible if LEN is #f, and write
it to OUT, using chunks of BUFFER-SIZE bytes. Call PROGRESS at the beginning
and after each successful transfer of BUFFER-SIZE bytes or less, passing it
the total number of bytes transferred and the continuation of the transfer as
a thunk."
(define buffer
(make-bytevector buffer-size))
(define (loop total bytes)
(or (eof-object? bytes)
(and len (= total len))
(let ((total (+ total bytes)))
(put-bytevector out buffer 0 bytes)
(progress total
(lambda ()
(loop total
(get-bytevector-n! in buffer 0 buffer-size)))))))
(get-bytevector-n! in buffer 0
(if len
(min (- len total) buffer-size)
buffer-size))))))))
;; Make sure PROGRESS is called when we start so that it can measure
;; throughput.
(progress 0
(lambda ()
(loop 0 (get-bytevector-n! in buffer 0 buffer-size)))))
(loop 0 (get-bytevector-n! in buffer 0
(if len
(min len buffer-size)
buffer-size))))))
(define (set-file-time file stat)
"Set the atime/mtime of FILE to that specified by STAT."