cairo-test.rs

#[link(name = "cairo")]
extern {
	fn cairo_matrix_init(this: *mut Matrix, xx: f64, yx: f64, xy: f64, yy: f64, x0: f64, y0: f64) -> Matrix;
}

pub struct Matrix {
	xx: f64,
	yx: f64,
	xy: f64,
	yy: f64,
	x0: f64,
	y0: f64
}

fn main() {
  use std;

  unsafe {
    let mut m = std::unstable::intrinsics::init();

    cairo_matrix_init(&mut m, 10.0, 1.0, 2.0, 3.0, 4.0, 5.0);
    
    println!("{:?}", m);
  }
}

test-cairo.c

#include <stdio.h>
#include <cairo.h>

int main() {
  cairo_matrix_t m;
  
  cairo_matrix_init(&m, 10.0, 1.0, 2.0, 3.0, 4.0, 5.0);
  
  printf("%f", m.x0);
  
  return 0;
}