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//! Libsodium version functions
use ffi;
use libc;
use std::slice;
use std::str;

/// `version_string()` returns the version string from libsodium.
pub fn version_string() -> &'static str {
    // Use libc directly because CStr isn't available with #![no_std] :(
    let version = unsafe {
        let version_ptr = ffi::sodium_version_string();
        let version_len = libc::strlen(version_ptr);
        slice::from_raw_parts(version_ptr as *const u8,
                              version_len as usize)
    };
    str::from_utf8(version).unwrap()
}

/// `version_major()` returns the major version from libsodium.
pub fn version_major() -> usize {
    unsafe {
        ffi::sodium_library_version_major() as usize
    }
}

/// `version_minor()` returns the minor version from libsodium.
pub fn version_minor() -> usize {
    unsafe {
        ffi::sodium_library_version_minor() as usize
    }
}

#[cfg(test)]
mod test {
    #[test]
    fn test_version_string() {
        use version::version_string;
        assert!(!version_string().is_empty());
    }
}