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From: Brian Candler on 2 Dec 2009 11:45
Iñaki Baz Castillo wrote:
> VALUE
> rb_enc_str_new(const char *ptr, long len, rb_encoding *enc)
> {
> VALUE str = rb_str_new(ptr, len);
> rb_enc_associate(str, enc);
> return str;
> }
>
> But I have no idea on how to set 'enc' parameter to be "UTF-8".
> How should I fill the third 'enc' argument?

I'd say give it a pointer to an rb_encoding object.

Have a look in encoding.c, this particular function might be useful:

rb_encoding *
rb_enc_find(const char *name)
{
int idx = rb_enc_find_index(name);
if (idx < 0) idx = 0;
return rb_enc_from_index(idx);
}

--
Posted via http://www.ruby-forum.com/.

From: Iñaki Baz Castillo on 2 Dec 2009 12:03
El Miércoles, 2 de Diciembre de 2009, Brian Candler escribió:
> Iñaki Baz Castillo wrote:
> > VALUE
> > rb_enc_str_new(const char *ptr, long len, rb_encoding *enc)
> > {
> > VALUE str = rb_str_new(ptr, len);
> > rb_enc_associate(str, enc);
> > return str;
> > }
> >
> > But I have no idea on how to set 'enc' parameter to be "UTF-8".
> > How should I fill the third 'enc' argument?
>
> I'd say give it a pointer to an rb_encoding object.
>
> Have a look in encoding.c, this particular function might be useful:
>
> rb_encoding *
> rb_enc_find(const char *name)
> {
> int idx = rb_enc_find_index(name);
> if (idx < 0) idx = 0;
> return rb_enc_from_index(idx);
> }

Humm, it involves allocating memory for the rb_encoding object and so... not
so trivial as I desired :)
But that's the way. Thanks a lot.


--
Iñaki Baz Castillo <ibc(a)aliax.net>

From: Brian Candler on 2 Dec 2009 12:59
Iñaki Baz Castillo wrote:
> El Miércoles, 2 de Diciembre de 2009, Brian Candler escribió:
>> > How should I fill the third 'enc' argument?
>> return rb_enc_from_index(idx);
>> }
>
> Humm, it involves allocating memory for the rb_encoding object

Why? AFAICS, you can just pass a pointer to an existing encoding object.
They are not mutated.

There are other examples, e.g. from io.c

#ifdef _WIN32
if (utf16 == (rb_encoding *)-1) {
utf16 = rb_enc_find("UTF-16LE");
if (utf16 == rb_ascii8bit_encoding())
utf16 = NULL;
}
if (utf16) {
VALUE wfname = rb_str_encode(fname, rb_enc_from_encoding(utf16),
0,
Qnil);
rb_enc_str_buf_cat(wfname, "", 1, utf16); /* workaround */
data.fname = RSTRING_PTR(wfname);
data.wchar = 1;
}
else {
data.wchar = 0;
}
#endif

It looks like rb_enc_from_encoding() takes a pointer to the rb_encoding
object returned from rb_enc_find, and turns it into a VALUE
--
Posted via http://www.ruby-forum.com/.

From: Iñaki Baz Castillo on 2 Dec 2009 17:01
El Miércoles, 2 de Diciembre de 2009, Brian Candler escribió:
> Iñaki Baz Castillo wrote:
> > El Miércoles, 2 de Diciembre de 2009, Brian Candler escribió:
> >> > How should I fill the third 'enc' argument?
> >>
> >> return rb_enc_from_index(idx);
> >> }
> >
> > Humm, it involves allocating memory for the rb_encoding object
>
> Why? AFAICS, you can just pass a pointer to an existing encoding object.
> They are not mutated.
>
> There are other examples, e.g. from io.c
>
> #ifdef _WIN32
> if (utf16 == (rb_encoding *)-1) {
> utf16 = rb_enc_find("UTF-16LE");
> if (utf16 == rb_ascii8bit_encoding())
> utf16 = NULL;
> }
> if (utf16) {
> VALUE wfname = rb_str_encode(fname, rb_enc_from_encoding(utf16),
> 0,
> Qnil);
> rb_enc_str_buf_cat(wfname, "", 1, utf16); /* workaround */
> data.fname = RSTRING_PTR(wfname);
> data.wchar = 1;
> }
> else {
> data.wchar = 0;
> }
> #endif
>
> It looks like rb_enc_from_encoding() takes a pointer to the rb_encoding
> object returned from rb_enc_find, and turns it into a VALUE

Ok, so the rb_encoding objects already exist and I just must use a point to
it.
Thanks a lot.


--
Iñaki Baz Castillo <ibc(a)aliax.net>

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