From jon.clayden at gmail.com  Mon Apr 28 12:00:10 2008
From: jon.clayden at gmail.com (Jon Clayden)
Date: Mon, 28 Apr 2008 11:00:10 +0100
Subject: [Rd] R 2.7.0, match() and strings containing \0 - bug?
Message-ID: <68e086180804280300k67057773yc7e8003259c6c6cf@mail.gmail.com>

Hi,

A piece of my code that uses readBin() to read a certain file type is
behaving strangely with R 2.7.0. This seems to be because of a failure
to match() strings after using rawToChar() when the original was
terminated with a "\0" character. Direct equality testing with ==
still works as expected. I can reproduce this as follows:

> x <- "foo"
> y <- c(charToRaw("foo"),as.raw(0))
> z <- rawToChar(y)
> z==x
[1] TRUE
> z=="foo"
[1] TRUE
> z %in% c("foo","bar")
[1] FALSE
> z %in% c("foo","bar","foo\0")
[1] FALSE

But without the nul character it works fine:

> zz <- rawToChar(charToRaw("foo"))
> zz %in% c("foo","bar")
[1] TRUE

I don't see anything about this in the latest NEWS, but is this
expected behaviour? Or is it, as I suspect, a bug? This seems to be
new to R 2.7.0, as I said.

Regards,
Jon



[Rd] R 2.7.0, match() and strings containing \0 - bug?
Jon Clayden