Function xmlTextWriterVSprintf

ThirdParty/libxml2/vtklibxml2/xmlwriter.c:4489–4522

* xmlTextWriterVSprintf: * @format: see printf * @argptr: pointer to the first member of the variable argument list. * * Utility function for formatted output * * Returns a new xmlChar buffer with the data or NULL on error. This buffer must be freed. */

 * Returns a new xmlChar buffer with the data or NULL on error. This buffer must be freed.
 */
static xmlChar *
xmlTextWriterVSprintf(const char *format, va_list argptr)
{
    int size;
    int count;
    xmlChar *buf;
    va_list locarg;

    size = BUFSIZ;
    buf = (xmlChar *) xmlMalloc(size);
    if (buf == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                        "xmlTextWriterVSprintf : out of memory!\n");
        return NULL;
    }

    va_copy(locarg, argptr);
    while (((count = vsnprintf((char *) buf, size, format, locarg)) < 0)
           || (count == size - 1) || (count == size) || (count > size)) {
	va_end(locarg);
        xmlFree(buf);
        size += BUFSIZ;
        buf = (xmlChar *) xmlMalloc(size);
        if (buf == NULL) {
            xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                            "xmlTextWriterVSprintf : out of memory!\n");
            return NULL;
        }
	va_copy(locarg, argptr);
    }
    va_end(locarg);

    return buf;
}

/**
 * xmlTextWriterStartDocumentCallback: