Function htmlParseLookupSequence

ThirdParty/libxml2/vtklibxml2/HTMLparser.c:5124–5181

* htmlParseLookupSequence: * @ctxt: an HTML parser context * @first: the first char to lookup * @next: the next char to lookup or zero * @third: the next char to lookup or zero * @ignoreattrval: skip over attribute values * * Try to find if a sequence (first, next, third) or just (first next) or * (first) is available in the input stream. * This function has a side effect of (possibl

 *      is available, -1 otherwise.
 */
static int
htmlParseLookupSequence(htmlParserCtxtPtr ctxt, xmlChar first,
                        xmlChar next, xmlChar third, int ignoreattrval)
{
    size_t base, len;
    htmlParserInputPtr in;
    const xmlChar *buf;
    int quote;

    in = ctxt->input;
    if (in == NULL)
        return (-1);

    base = ctxt->checkIndex;
    quote = ctxt->endCheckState;

    buf = in->cur;
    len = in->end - in->cur;

    /* take into account the sequence length */
    if (third)
        len -= 2;
    else if (next)
        len--;
    for (; base < len; base++) {
        if (base >= INT_MAX / 2) {
            ctxt->checkIndex = 0;
            ctxt->endCheckState = 0;
            return (base - 2);
        }
        if (ignoreattrval) {
            if (quote) {
                if (buf[base] == quote)
                    quote = 0;
                continue;
            }
            if (buf[base] == '"' || buf[base] == '\'') {
                quote = buf[base];
                continue;
            }
        }
        if (buf[base] == first) {
            if (third != 0) {
                if ((buf[base + 1] != next) || (buf[base + 2] != third))
                    continue;
            } else if (next != 0) {
                if (buf[base + 1] != next)
                    continue;
            }
            ctxt->checkIndex = 0;
            ctxt->endCheckState = 0;
            return (base);
        }
    }
    ctxt->checkIndex = base;
    ctxt->endCheckState = quote;
    return (-1);
}