No need for manual nul byte

examples/demo/src/main.rs

@@ -17,7 +17,7 @@ fn main() -> Result<(), String> {
     ));
 
     let output_settings = OutputSettingsBuilder::new().scale(4).build();
-    let mut window = Window::new("Hello World", &output_settings);
+    let mut window = Window::new("PineTime", &output_settings);
 
     let mut ui = UI::init().unwrap();
 
@@ -42,7 +42,7 @@ fn main() -> Result<(), String> {
     style_time.set_text_color(lvgl::Color::from_rgb((255, 255, 255)));
     time.set_style(style_time);
     time.set_align(&mut screen, lvgl::Align::InLeftMid, 20, 0);
-    time.set_text("20:46\0");
+    time.set_text("20:46");
     time.set_width(240);
     time.set_height(240);
 
@@ -54,7 +54,7 @@ fn main() -> Result<(), String> {
     bt.set_width(50);
     bt.set_height(80);
     bt.set_recolor(true);
-    bt.set_text("#5794f2 \u{F293}#\0");
+    bt.set_text("#5794f2 \u{F293}#");
     bt.set_label_align(lvgl::LabelAlign::Left);
     bt.set_align(&mut screen, lvgl::Align::InTopLeft, 0, 0);
 
@@ -63,7 +63,7 @@ fn main() -> Result<(), String> {
     power.set_recolor(true);
     power.set_width(80);
     power.set_height(20);
-    power.set_text("#fade2a 20%#\0");
+    power.set_text("#fade2a 20%#");
     power.set_label_align(lvgl::LabelAlign::Right);
     power.set_align(&mut screen, lvgl::Align::InTopRight, 0, 0);
 
@@ -86,7 +86,7 @@ fn main() -> Result<(), String> {
         if i > 59 {
             i = 0;
         }
-        time.set_text(format!("21:{:02}\0", i).as_str());
+        time.set_text(format!("21:{:02}", i).as_str());
         i = 1 + i;
 
         sleep(Duration::from_millis(
@@ -112,6 +112,13 @@ fn main() -> Result<(), String> {
 }
 
 // Reference to native font for LittlevGL, defined in the file: "fonts_noto_sans_numeric_80.c"
+// TODO: Create a macro for definiting a safe wrapper for fonts.
+// Maybe sometihng like:
+//
+// font! {
+//     NotoSansNumeric80 = noto_sans_numeric_80;
+// };
+//
 extern "C" {
     pub static mut noto_sans_numeric_80: lvgl_sys::lv_font_t;
 }

lvgl/Cargo.toml

@@ -16,3 +16,4 @@ keywords = ["littlevgl", "lvgl", "graphical_interfaces"]
 lvgl-sys = {path="../lvgl-sys", version="0.1"}
 cty = "0.2"
 embedded-graphics = "0.6"
+cstr_core = { version = "0.2", default-features = false, features = ["alloc"] }

lvgl/src/global.rs

@@ -15,8 +15,6 @@ pub enum LvError {
     AlreadyInUse,
 }
 
-type LvResult<T> = Result<T, LvError>;
-
 pub struct UI {
     // LittlevGL is not thread-safe by default.
     _not_sync: PhantomData<*mut ()>,

lvgl/src/support.rs

@@ -1,7 +1,7 @@
 use alloc::boxed::Box;
 use core::mem;
 use core::ptr;
-use cty;
+use cstr_core::CString;
 use embedded_graphics::pixelcolor::{Rgb565, Rgb888};
 use lvgl_sys;
 
@@ -170,11 +170,9 @@ impl Label {
     }
 
     pub fn set_text(&mut self, text: &str) {
+        let text = CString::new(text).unwrap();
         unsafe {
-            lvgl_sys::lv_label_set_text(
-                self.core.raw().as_mut(),
-                text.as_ptr() as *const cty::c_char,
-            );
+            lvgl_sys::lv_label_set_text(self.core.raw().as_mut(), text.as_ptr());
         }
     }
 
@@ -234,10 +232,6 @@ impl Style {
     pub fn set_text_font(&mut self, font: &lvgl_sys::lv_font_t) {
         self.raw.text.font = font;
     }
-
-    fn raw(&mut self) -> *const lvgl_sys::lv_style_t {
-        &mut self.raw
-    }
 }
 
 impl Clone for Style {