Function is_self_closing

internal/cbm/iris_export_xml.c:48–53

    return p < end ? p + 1 : end;
}
static bool is_self_closing(const char *start, const char *gt) {
    const char *p = gt - 1;
    while (p > start && (*p == ' ' || *p == '\t'))
        p--;
    return *p == '/';
}
static void extract_attr(const char *ts, const char *te, const char *attr, char *out, size_t sz) {
    out[0] = '\0';
    size_t an = strlen(attr);