Thanks for the report, fixed in R-devel (74848).
Best
Tomas
On 06/04/2018 02:41 PM, NELSON, Michael wrote:
On R 3.5.0 (Mac)
The issue appears when using the default (libcurl) method and specifying the
encoding
Note that using method='internal' causes a segfault if used in conjunction with
encoding. (and works when encoding is not set)
urlR <- "http://home.versanet.de/~s-berman/source2.R";
# works
url_default <- url(urlR)
scan(url_default, "")
# Read 7 items
# [1] "source.test2" "<-" "function()" "{"
"print(\"Non-ascii:" "äöüß\")"
# [7] "}"
url_default_en <- url(urlR, encoding = "UTF-8")
scan(url_default_en, "")
# Read 0 items
# character(0)
url_internal <- url(urlR, method = 'internal')
scan(url_internal, "")
# Read 7 items
# [1] "source.test2" "<-" "function()" "{"
"print(\"Non-ascii:" "äöüß\")"
# [7] "}"
url_internal_en <- url(urlR, encoding = "UTF-8", method = 'internal')
#scan(url_internal_en, "")
#*** caught segfault ***
# address 0x0, cause 'memory not mapped'
url_libcurl <- url(urlR, method = 'libcurl')
scan(url_libcurl, "")
# Read 7 items
# [1] "source.test2" "<-" "function()" "{"
"print(\"Non-ascii:" "äöüß\")"
# [7] "}"
url_libcurl_en <- url(urlR, encoding = "UTF-8", method = 'libcurl')
scan(url_libcurl_en, "")
# Read 0 items
# character(0)
Michael
________________________________________
From: R-devel [r-devel-boun...@r-project.org] on behalf of Stephen Berman
[stephen.ber...@gmx.net]
Sent: Monday, 4 June 2018 7:26 PM
To: Martin Maechler
Cc: R-devel
Subject: Re: [Rd] encoding argument of source() in 3.5.0
On Mon, 4 Jun 2018 10:44:11 +0200 Martin Maechler <maech...@stat.math.ethz.ch>
wrote:
peter dalgaard
on Sun, 3 Jun 2018 23:51:24 +0200 writes:
> Looks like this actually comes from readLines(), nothing
> to do with source() as such: In current R-devel (still):
>> f <- file("http://home.versanet.de/~s-berman/source2.R";,
encoding="UTF-8")
>> readLines(f)
> character(0)
>> close(f)
>> f <- file("http://home.versanet.de/~s-berman/source2.R";)
>> readLines(f)
> [1] "source.test2 <- function() {" " print(\"Non-ascii: äöüß\")"
> [3] "}"
> -pd
and that's not even readLines(), but rather how exactly the
connection is defined [even in your example above]
> urlR <- "http://home.versanet.de/~s-berman/source2.R";
> readLines(urlR, encoding="UTF-8")
[1] "source.test2 <- function() {" " print(\"Non-ascii: äöüß\")"
[3] "}"
> f <- file(urlR, encoding = "UTF-8")
> readLines(f)
character(0)
and the same behavior with scan() instead of readLines() :
scan(urlR,"") # works
Read 7 items
[1] "source.test2" "<-" "function()" "{"
[5] "print(\"Non-ascii:" "äöüß\")" "}"
scan(f,"") # fails
Read 0 items
character(0)
So it seems as if the bug is in the file() [or url()] C code ..
Yes, the problem seems to be restricted to loading files from a
(non-local) URL; i.e. this works fine on my computer:
> source("file:///home/steve/prog/R/source2.R", encoding="UTF-8")
Also, I noticed this works too:
> read.table("http://home.versanet.de/~s-berman/table2";, encoding="UTF-8",
skip=1)
where (if I read the source correctly) using `skip=1' makes read.table()
call readLines(). (The read.table() invocation also works without
`skip'.)
But then we also have to consider Windows .. where I think most changes have
happened during the R-3.4.4 --> R-3.5.0 transition.
Yes, please. I need (or at least it would be convenient) to be able to
load R code containing non-ascii characters from the web under
MS-Windows.
Steve Berman
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