Method XToPos

engine/Poseidon/UI/Controls/UIControls.cpp:1779–1832

    float left;
    int style = ST_LEFT;
    if ((_style & ST_TYPE) == ST_MULTI || _firstVisible == 0)
    {
        style = _style & ST_HPOS;
    }
    float size = _scale * _size;
    switch (style)
    {
        case ST_RIGHT:
            left = _x + _w - GLOB_ENGINE->GetTextWidth(size, _font, text) - _scale * textBorder;
            break;
        case ST_CENTER:
            left = _x + 0.5 * (_w - GLOB_ENGINE->GetTextWidth(size, _font, text));
            break;
        default:
            PoseidonAssert((_style & ST_HPOS) == ST_LEFT) left = _x + _scale * textBorder;
            break;
    }

    RString str = text.Substring(0, pos);
    return left + GLOB_ENGINE->GetTextWidth(size, _font, str);
}

int CEdit::XToPos(RString text, float x) const
{
    float left;
    int style = ST_LEFT;
    if ((_style & ST_TYPE) == ST_MULTI || _firstVisible == 0)
    {
        style = _style & ST_HPOS;
    }
    float size = _scale * _size;
    switch (style)
    {
        case ST_RIGHT:
            left = _x + _w - GLOB_ENGINE->GetTextWidth(size, _font, text) - _scale * textBorder;
            break;
        case ST_CENTER:
            left = _x + 0.5 * (_w - GLOB_ENGINE->GetTextWidth(size, _font, text));
            break;
        default:
            PoseidonAssert((_style & ST_HPOS) == ST_LEFT) left = _x + _scale * textBorder;
            break;
    }

    if (x < left)
    {
        return 0;
    }

    // Iterate the passed-in `text` (a single line / scrolled substring), NOT the
    // whole `_text`: callers pass GetLine() or a Substring shorter than _text, so
    // bounding the loop by strlen(_text) walks CopyTextElement past the buffer —
    // an out-of-bounds read (crash) or a stall at the NUL (freeze).
    int n = strlen(text);
    for (int i = 0; i < n;)
    {
        int j = i;