[Rd] minor iconvlist() bug in r-devel

[Deepayan Sarkar]

On Wednesday 16 March 2005 10:11, Prof Brian Ripley wrote:
> That file is created by
>
> $(top_builddir)/library/$(pkg)/iconvlist: most
>          @iconv -l > $@ 2> /dev/null || touch $@
>
> What version of iconv -l is that produces such a list?  That in glibc
> 2.3.4 does not produce the header when redirected.

I have version '2.3.2.ds1-20' on Debian testing. '--silent' doesn't 
help.

> Your fix is not safe: iconv in libiconv produces items separated by
> space or newline.  Looks like we will have to work harder to
> distinguish the two.

Can anything with a lowercase letter be safely rejected? That would 
bring the spurious names down to 2 (FROM and TO).

Deepayan

> Brian
>
> On Wed, 16 Mar 2005, Deepayan Sarkar wrote:
> > This is on r-devel from 2005-03-15. iconvlist() uses (at least some
> > of the time)
> >
> > icfile <- system.file("iconvlist", package = "utils")
> >
> > which looks like
> >
> > """
> > The following list contain all the coded character sets known. 
> > This does not necessarily mean that all combinations of these names
> > can be used for the FROM and TO command line parameters.  One coded
> > character set can be listed with several different names (aliases).
> >
> >  437//
> > 500//
> > .
> > .
> > .
> > """
> >
> > which leads to
> >
> >> tail(iconvlist(), n = 40)
> >
> > [1] "WS2"          "YU"           "all"          "all"         
> > "and" [6] "be"           "be"           "can"          "can"     
> > "character" [11] "character"    "coded"        "coded"    
> > "combinations" "command" [16] "contain"      "different"    "does" 
> >        "following"    "for" [21] "known."       "line"        
> > "list"         "listed"       "mean" [26] "names"        "names"   
> >     "necessarily"  "not"          "of" [31] "parameters."  "set"   
> >       "sets"         "several"      "that" [36] "the"         
> > "the"          "these"        "used"         "with"
> >
> > A possible fix seems to be to replace
> >
> >    ext <- readLines(icfile)
> >
> > by
> >
> >    ext <- grep("/$", readLines(icfile), value = TRUE)
> >
> > but I don't know if that's guaranteed to work.
> >
> > -Deepayan
> >
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