[freetds] RE: latest snapshot testing on Sun Solaris
Lowden, James K
LowdenJK at bernstein.com
Wed Jun 25 11:43:04 EDT 2003
> From: Thompson, Bill D (London) [mailto:ThompBil at exchange.uk.ml.com]
> Sent: June 25, 2003 7:56 AM
> I discovered that my iconv() would convert ISO-8859 to UTF-8 (despite
> circumstantial evidence to the contrary), so I did this and
> got past that
> stage. However I then fell over on the ISO-8859 / UCS-2
> conversions. My
> iconv was having none of that.
I'd look once more, Bill. It seems very unlikely to me that it would
support UTF-8 and not UCS-2, because UCS-2 was the first of the Unicode
standards. It might be called UCS-2LE or something more peculiar. I can't
see how a UTF-8 conversion could be accomplished without full knowledge of
UCS-2. (After all, UTF-8 is a multibyte "transitional" representation of
> If I code a replacements/iconv.c , will it have to replace my
> existing iconv in all cases ?
> If so, will I also have to cater for other conversions - like the
> 8859->ASCII and the 8859->UTF-8 ?
No. replacements/iconv.c will enable FreeTDS to do only what it used to do
without iconv: add a zero high byte to create UCS-2, and strip the high byte
to create ISO-8859-1. It also has to support the trivial pass-through case,
because in some cases we expect iconv to copy the buffer even when it's not
strictly necessary (think tdsconvert).
> Any Idea what an iconv_t is ?
$ grep iconv_t /usr/pkg/include/i*.h |egrep 'type|def' |tail -1
typedef void* iconv_t;
> or at least some ideas about what I'll need to put in my own
> version of it ?
I think you'll need
typedef void* iconv_t;
Another thought, Bill: Maybe you could rip the minimum code right out of
GNU iconv. Use their headers, their handle generation/lookup method, etc.
Probably replace just the conversion algorithm. They're LGPL, too, same as
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