From d9ed588c0e5294f780c0348cb6e3a94841b80b4d Mon Sep 17 00:00:00 2001
From: Jesse Brault <jbrault@mac.com>
Date: Fri, 22 Nov 2024 20:01:10 -0600
Subject: [PATCH] Add some more extern C code.

---
 build.rs    |  6 ++----
 src/main.rs | 16 ++++++++++++++--
 src/test.c  |  9 ++++++++-
 3 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/build.rs b/build.rs
index b7c2e31..7e264b4 100644
--- a/build.rs
+++ b/build.rs
@@ -1,7 +1,5 @@
 fn main() {
     // Tell Cargo to rerun if the c file is changed
     println!("cargo:rerun-if-changed=src/test.c");
-    cc::Build::new()
-        .file("src/test.c")
-        .compile("test");
-}
\ No newline at end of file
+    cc::Build::new().file("src/test.c").compile("test");
+}
diff --git a/src/main.rs b/src/main.rs
index 1412a84..6096875 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,18 +13,28 @@ impl Greeter {
         Greeter { greeting }
     }
 
-    fn greet(&self) {
+    pub fn greet(&self) {
         println!("{}", self.greeting);
     }
 }
 
 extern "C" {
     fn print_num(num: i32);
+    fn print_a_string(s: *const u8, len: usize);
 }
 
 fn main() {
     Greeter::new("Hello, Jesse!").greet();
 
+    // Calling some C
+
+    let original_s = "Hello from C-Rust land!";
+    unsafe {
+        print_a_string(original_s.as_ptr(), original_s.len());
+    }
+
+    // Testing out stack
+
     let mut my_stack = Stack::new();
     my_stack.push(Greeter::new("Hello"));
     my_stack.push(Greeter::new("Beautiful"));
@@ -49,5 +59,7 @@ fn main() {
 
     // calling some C
     let find_result = bst.find(3).unwrap_or(-1);
-    unsafe { print_num(find_result); }
+    unsafe {
+        print_num(find_result);
+    }
 }
diff --git a/src/test.c b/src/test.c
index 3d7dfda..3a5b6cf 100644
--- a/src/test.c
+++ b/src/test.c
@@ -1,5 +1,12 @@
 #include <stdio.h>
 
-void print_num(int num) {
+void print_num(const int num) {
     printf("[from c]: num is %d\n", num);
+}
+
+void print_a_string(const char* s, const size_t length) {
+    for (int i = 0; i < length; i++) {
+        printf("%c", s[i]);
+    }
+    printf("\n");
 }
\ No newline at end of file