OSL - simple UV things and frac fract alternative

Here is a shoddy OSL shader that follow on from some of my GLSL experiments of yesteryear. I couldn't seem to find a frac or fract function, but fmod-ing (it's like modulo) against 1 does the same thing.
I don't put any input parameters in this shader.

EDIT - just saw someone else's code that use x-floor(x) for fract, which could be faster..who knows!

Variables Lame an Cat are assigned to u and v, I then multiply them by different values and fmod them so they repeat 3 and 4 times. It seems like u and v will be taken automatically, which is nice.
After that I do a bit of if statement colour assignment.

 

shader use_uv(output color resultRGB = 0)

{

    float lame=u;

    float cat=v;

    cat=fmod(v*3,1);

    lame=fmod(u*4,1);

    resultRGB = color(lame, v, 1);

    if(lame>0.5){

    resultRGB+=color(0.3,0.4,0);

}

if(v<0.1){

    resultRGB+=color(0,0,1);

}

if(lame<0.5){

    resultRGB+=color(0,lame,0);

}

}