From 58ea520a63d66c526ffe6ab01a68dff84653e707 Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Sun, 10 Jan 2021 18:21:01 +0800
Subject: [PATCH] feat: dotalib

---
 __ffi/dotalib/dotalib.h  |  6 +++++-
 __ffi/dotalib/justfile   | 10 ++++++++++
 __ffi/dotalib/src/lib.rs | 21 +++++++++++++++++++--
 __ffi/dotalib/test.c     |  6 +++++-
 4 files changed, 39 insertions(+), 4 deletions(-)
 create mode 100644 __ffi/dotalib/justfile

diff --git a/__ffi/dotalib/dotalib.h b/__ffi/dotalib/dotalib.h
index f96ab1d..e0dd3f8 100644
--- a/__ffi/dotalib/dotalib.h
+++ b/__ffi/dotalib/dotalib.h
@@ -5,4 +5,8 @@
 #include <stdlib.h>
 
 
-void print_hello_world(void);
+const char *get_str(void);
+
+char *get_str_mut(void);
+
+void println(const char *str);
diff --git a/__ffi/dotalib/justfile b/__ffi/dotalib/justfile
new file mode 100644
index 0000000..50dd480
--- /dev/null
+++ b/__ffi/dotalib/justfile
@@ -0,0 +1,10 @@
+_:
+  @just --list
+
+bindgen:
+  cbindgen --config cbindgen.toml --crate dotalib --lang c --output dotalib.h
+
+build: bindgen
+  cargo build
+  gcc -Ltarget/debug/ -ldota test.c
+
diff --git a/__ffi/dotalib/src/lib.rs b/__ffi/dotalib/src/lib.rs
index 6fa6b6c..3650fb2 100644
--- a/__ffi/dotalib/src/lib.rs
+++ b/__ffi/dotalib/src/lib.rs
@@ -1,4 +1,21 @@
+use std::{ffi::{CStr, CString}, os::raw::c_char};
+
 #[no_mangle]
-pub unsafe extern "C" fn print_hello_world() {
-   println!("Hello World!");
+pub unsafe extern "C" fn println(str: *const c_char) {
+   let c_str = CStr::from_ptr(str).to_str().unwrap();
+   println!("{}", c_str);
 }
+
+#[no_mangle]
+pub unsafe extern "C" fn get_str_mut() -> *mut c_char {
+   let c_string = CString::new("hello world!").expect("Error!");
+   c_string.into_raw()
+}
+
+
+#[no_mangle]
+pub unsafe extern "C" fn get_str() -> *const c_char {
+   let c_string = CString::new("hello world!").expect("Error!");
+   c_string.as_ptr()
+}
+
diff --git a/__ffi/dotalib/test.c b/__ffi/dotalib/test.c
index ac50146..bc93a47 100644
--- a/__ffi/dotalib/test.c
+++ b/__ffi/dotalib/test.c
@@ -1,5 +1,9 @@
+#include <stdio.h>
 #include "dotalib.h"
 
 int main(int argc, char** argv) {
-  print_hello_world();
+  println("hello world");
+  char* s = get_str_mut();
+  printf("Get: %s\n", s);
+  free(s);
 }