/*
* call-seq:
* from_io(io, url = nil, encoding = nil, options = 0)
*
* Create a new reader that parses +io+
*/
static VALUE from_io(int argc, VALUE *argv, VALUE klass)
{
VALUE rb_io, rb_url, encoding, rb_options;
const char * c_url = NULL;
const char * c_encoding = NULL;
int c_options = 0;
rb_scan_args(argc, argv, "13", &rb_io, &rb_url, &encoding, &rb_options);
if (!RTEST(rb_io)) rb_raise(rb_eArgError, "io cannot be nil");
if (RTEST(rb_url)) c_url = StringValuePtr(rb_url);
if (RTEST(encoding)) c_encoding = StringValuePtr(encoding);
if (RTEST(rb_options)) c_options = NUM2INT(rb_options);
xmlTextReaderPtr reader = xmlReaderForIO(
(xmlInputReadCallback)io_read_callback,
(xmlInputCloseCallback)io_close_callback,
(void *)rb_io,
c_url,
c_encoding,
c_options
);
if(reader == NULL) {
xmlFreeTextReader(reader);
rb_raise(rb_eRuntimeError, "couldn't create a parser");
}
VALUE rb_reader = Data_Wrap_Struct(klass, NULL, dealloc, reader);
rb_funcall(rb_reader, rb_intern("initialize"), 3, rb_io, rb_url, encoding);
return rb_reader;
}