Function char_link

libraries/hoedown/src/document.c:1068–1289

char_link • '[': parsing a link, a footnote or an image */

/* char_link • '[': parsing a link, a footnote or an image */
static size_t
char_link(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
    int is_img = (offset && data[-1] == '!' && !is_escaped(data - offset, offset - 1));
    int is_footnote = (doc->ext_flags & HOEDOWN_EXT_FOOTNOTES && data[1] == '^');
    size_t i = 1, txt_e, link_b = 0, link_e = 0, title_b = 0, title_e = 0;
    hoedown_buffer *content = NULL;
    hoedown_buffer *link = NULL;
    hoedown_buffer *title = NULL;
    hoedown_buffer *u_link = NULL;
    size_t org_work_size = doc->work_bufs[BUFFER_SPAN].size;
    int ret = 0, in_title = 0, qtype = 0;

    /* checking whether the correct renderer exists */
    if ((is_footnote && !doc->md.footnote_ref) || (is_img && !doc->md.image)
        || (!is_img && !is_footnote && !doc->md.link))
        goto cleanup;

    /* looking for the matching closing bracket */
    i += find_emph_char(data + i, size - i, ']');
    txt_e = i;

    if (i < size && data[i] == ']') i++;
    else goto cleanup;

    /* footnote link */
    if (is_footnote) {
        hoedown_buffer id = { NULL, 0, 0, 0, NULL, NULL, NULL };
        struct footnote_ref *fr;

        if (txt_e < 3)
            goto cleanup;

        id.data = data + 2;
        id.size = txt_e - 2;

        fr = find_footnote_ref(&doc->footnotes_found, id.data, id.size);

        /* mark footnote used */
        if (fr && !fr->is_used) {
            if(!add_footnote_ref(&doc->footnotes_used, fr))
                goto cleanup;
            fr->is_used = 1;
            fr->num = doc->footnotes_used.count;

            /* render */
            if (doc->md.footnote_ref)
                ret = doc->md.footnote_ref(ob, fr->num, &doc->data);
        }

        goto cleanup;
    }

    /* skip any amount of spacing */
    /* (this is much more laxist than original markdown syntax) */
    while (i < size && _isspace(data[i]))
        i++;