fltk 0.11.4

use std::ffi::CString;

pub(crate) trait FlString {
    fn safe_new(s: &str) -> CString;
}

impl FlString for CString {
    fn safe_new(s: &str) -> CString {
        match CString::new(s) {
            Ok(v) => v,
            Err(r) => {
                let i = r.nul_position();
                CString::new(&r.into_vec()[0..i]).unwrap()
            }
        }
    }
}

/// Convenience function to convert rgb to hex
/// Example: 
/// ```rust
/// let ret = rgb2hex(0, 255, 0); println!("0x{:06x}", ret);
/// ```
pub fn rgb2hex(r: u8, g: u8, b: u8) -> u32 {
    // Shouldn't fail
    u32::from_str_radix(&format!("{:02x}{:02x}{:02x}", r, g, b), 16).unwrap()
}

/// Convenience function to convert hex to rgb
/// Example:
/// ```rust
/// let (r, g, b) = hex2rgb(0x000000);
/// ```
pub fn hex2rgb(val: u32) -> (u8, u8, u8) {
    let hex = format!("{:06x}", val);
    let r = u8::from_str_radix(&hex[0..2], 16).unwrap();
    let g = u8::from_str_radix(&hex[2..4], 16).unwrap();
    let b = u8::from_str_radix(&hex[4..6], 16).unwrap();
    (r, g, b)
}