make it compatible with no_std environment

rust/libnotcurses-sys/Cargo.toml

@@ -19,7 +19,12 @@ categories = [
 keywords = ["tui", "cli", "terminal", "ncurses", "ffi"]
 
 [dependencies]
-libc = "0.2.74"
+libc = {version = "0.2.74", default-features = false}
+cty = "0.2.1"
+# blocked by: https://github.com/Amanieu/cstr_core/issues/4
+# cstr_core = "0.2"
+cstr_core = {path = "../../../../_temp_clones/cstr_core"}
+libc-print = "0.1.13"
 
 [build-dependencies]
 bindgen = ">= 0.52.0"

rust/libnotcurses-sys/build.rs

@@ -21,6 +21,8 @@ fn main() {
     // The bindgen::Builder is the main entry point to bindgen, and lets you
     // build up options for the resulting bindings.
     let mut builder = bindgen::Builder::default()
+        .use_core()
+        .ctypes_prefix("cty")
         .clang_arg("-D_XOPEN_SOURCE")
         // The input header we would like to generate
         // builder for.

rust/libnotcurses-sys/src/cells.rs

@@ -66,7 +66,7 @@
 // - ? gcluster (&str) > type alias?
 // - ? attr (u32)  > type alias?
 
-use std::ffi::CString;
+use cstr_core::CString;
 
 use crate as ffi;
 use crate::types::{ChannelPair, IntResult};
@@ -141,7 +141,6 @@ pub fn cells_load_box(
 //     return -1;
 // }
 
-
 // static inline void
 // cell_init(cell* c){
 //     memset(c, 0, sizeof(*c));

rust/libnotcurses-sys/src/lib.rs

@@ -1,6 +1,7 @@
 #![allow(non_upper_case_globals)]
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
+#![no_std]
 
 mod cells;
 mod channel;
@@ -23,9 +24,10 @@ include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
 
 #[cfg(test)]
 mod tests {
-    use std::ffi::{CStr, CString};
-    use std::ptr::{null, null_mut};
+    use core::ptr::{null, null_mut};
+    use cstr_core::{CStr, CString};
 
+    use libc_print::*;
     use serial_test::serial; // serialize tests w/ ffi::notcurses_init()
 
     use crate as ffi;
@@ -39,7 +41,7 @@ mod tests {
             CStr::from_ptr(s)
         };
         let r_str = c_str.to_str().unwrap();
-        println!("rust-bound notcurses v{}", r_str);
+        libc_println!("rust-bound notcurses v{}", r_str);
     }
 
     #[test]

rust/libnotcurses-sys/src/plane.rs

@@ -140,8 +140,8 @@
 // ncplane_vline
 // ncplane_vprintf
 
-use std::ffi::CString;
-use std::ptr::null_mut;
+use core::ptr::null_mut;
+use cstr_core::CString;
 
 use crate as ffi;
 use ffi::types::IntResult;