I was going through the SDL_IntersectRectAndLine function and wondered to see the ComputeOutCode function implementation.
Currently the function is:
static int ComputeOutCode(const SDL_Rect * rect, int x, int y)
{
    int code = 0;
    if (y < 0) {
        code |= CODE_TOP;
    } else if (y >= rect->y + rect->h) {
        code |= CODE_BOTTOM;
    }
    if (x < 0) {
        code |= CODE_LEFT;
    } else if (x >= rect->x + rect->w) {
        code |= CODE_RIGHT;
    }
    return code;
}

The problem in this algo is, x and y axis are getting check with respect to 0, Which is wrong, it should be get checked with respect to rectangle x and y axis.
Modified code should be:
static int ComputeOutCode(const SDL_Rect * rect, int x, int y)
{
    int code = 0;
    if (y < rect->y) {
        code |= CODE_TOP;
    } else if (y >= rect->y + rect->h) {
        code |= CODE_BOTTOM;
    }
    if (x < rect->x) {
        code |= CODE_LEFT;
    } else if (x >= rect->x + rect->w) {
        code |= CODE_RIGHT;
    }
    return code;
}

Thanks!