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utils: canonical-newline-port: Fix handling of carriage return at buffer end.

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Prior to this change the added test fails for me locally at byte
1024. It might depend on some default buffer sizes.

Fixes <https://bugs.gnu.org/35863>.

* tests/utils.scm ("canonical-newline-port-1024"): Add test.
* guix/utils.scm (canonical-newline-port): Correct comments on CR/LF.
Remove CR even when they're at the end of the buffer.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Robert Vollmert 2019-06-16 16:18:29 +02:00 committed by Ludovic Courtès
parent c050f18700
commit 3149c00264
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2 changed files with 9 additions and 3 deletions
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6
guix/utils.scm
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@ -718,7 +718,7 @@ environment variable name like \"XDG_CONFIG_HOME\"; SUFFIX is a suffix like
(define (canonical-newline-port port)
"Return an input port that wraps PORT such that all newlines consist
of a single carriage return."
of a single linefeed."
(define (get-position)
(if (port-has-port-position? port) (port-position port) #f))
(define (set-position! position)
@ -730,11 +730,11 @@ environment variable name like \"XDG_CONFIG_HOME\"; SUFFIX is a suffix like
(let loop ((count 0)
(byte (get-u8 port)))
(cond ((eof-object? byte) count)
;; XXX: consume all CRs even if not followed by LF.
((eqv? byte (char->integer #\return)) (loop count (get-u8 port)))
((= count (- n 1))
(bytevector-u8-set! bv (+ start count) byte)
n)
;; XXX: consume all LFs even if not followed by CR.
((eqv? byte (char->integer #\return)) (loop count (get-u8 port)))
(else
(bytevector-u8-set! bv (+ start count) byte)
(loop (+ count 1) (get-u8 port))))))

6
tests/utils.scm
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@ -230,6 +230,12 @@ skip these tests."
"This is a journey\r\nInto the sound\r\nA journey ...\n")))
(get-string-all (canonical-newline-port port))))
(test-equal "canonical-newline-port-1024"
(string-concatenate (make-list 100 "0123456789abcde\n"))
(let ((port (open-string-input-port
(string-concatenate
(make-list 100 "0123456789abcde\r\n")))))
(get-string-all (canonical-newline-port port))))
(test-equal "edit-expression"
"(display \"GNU Guix\")\n(newline)\n"