Function xmlTextWriterStartDocument

ThirdParty/libxml2/vtklibxml2/xmlwriter.c:507–616

* xmlTextWriterStartDocument: * @writer: the xmlTextWriterPtr * @version: the xml version ("1.0") or NULL for default ("1.0") * @encoding: the encoding or NULL for default * @standalone: "yes" or "no" or NULL for default * * Start a new xml document * * Returns the bytes written (may be 0 because of buffering) or -1 in case of error */

 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartDocument(xmlTextWriterPtr writer, const char *version,
                           const char *encoding, const char *standalone)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlCharEncodingHandlerPtr encoder;

    if ((writer == NULL) || (writer->out == NULL)) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterStartDocument : invalid writer!\n");
        return -1;
    }

    lk = xmlListFront(writer->nodes);
    if ((lk != NULL) && (xmlLinkGetData(lk) != NULL)) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterStartDocument : not allowed in this context!\n");
        return -1;
    }

    encoder = NULL;
    if (encoding != NULL) {
        encoder = xmlFindCharEncodingHandler(encoding);
        if (encoder == NULL) {
            xmlWriterErrMsg(writer, XML_ERR_UNSUPPORTED_ENCODING,
                            "xmlTextWriterStartDocument : unsupported encoding\n");
            return -1;
        }
    }

    writer->out->encoder = encoder;
    if (encoder != NULL) {
	if (writer->out->conv == NULL) {
	    writer->out->conv = xmlBufCreateSize(4000);
	}
        xmlCharEncOutput(writer->out, 1);
        if ((writer->doc != NULL) && (writer->doc->encoding == NULL))
            writer->doc->encoding = xmlStrdup((xmlChar *)writer->out->encoder->name);
    } else
        writer->out->conv = NULL;

    sum = 0;
    count = xmlOutputBufferWriteString(writer->out, "<?xml version=");
    if (count < 0)
        return -1;
    sum += count;
    count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
    if (count < 0)
        return -1;
    sum += count;
    if (version != 0)
        count = xmlOutputBufferWriteString(writer->out, version);
    else
        count = xmlOutputBufferWriteString(writer->out, "1.0");
    if (count < 0)
        return -1;