From 490f7f33350109a285b2f6c43bdd964e0479bd31 Mon Sep 17 00:00:00 2001
From: Alex Kotov <kotovalexarian@gmail.com>
Date: Fri, 3 Jun 2022 02:35:34 +0300
Subject: [PATCH] Rust add module "kernaux_sys::cmdline"

---
 pkgs/rust/kernaux-sys/src/cmdline.rs | 70 ++++++++++++++++++++++++++++
 pkgs/rust/kernaux-sys/src/lib.rs     |  2 +
 2 files changed, 72 insertions(+)
 create mode 100644 pkgs/rust/kernaux-sys/src/cmdline.rs

diff --git a/pkgs/rust/kernaux-sys/src/cmdline.rs b/pkgs/rust/kernaux-sys/src/cmdline.rs
new file mode 100644
index 0000000..c8ffb44
--- /dev/null
+++ b/pkgs/rust/kernaux-sys/src/cmdline.rs
@@ -0,0 +1,70 @@
+use libc::{c_char, size_t};
+
+pub const ERROR_MSG_SIZE_MAX: usize = 256;
+pub const ERROR_MSG_SLEN_MAX: usize = ERROR_MSG_SIZE_MAX - 1;
+
+#[link(name = "kernaux")]
+extern "C" {
+    #[link_name = "kernaux_cmdline"]
+    // TODO: Rust's "bool" is not guaranteed to be compatible with C's one
+    pub fn cmdline(
+        cmdline: *const c_char,
+        error_msg: *mut c_char,
+        argc: *mut size_t,
+        argv: *mut *mut c_char,
+        buffer: *mut c_char,
+        argv_count_max: size_t,
+        buffer_size: size_t,
+    ) -> bool;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use std::ffi::{CStr, CString};
+
+    const ARGV_COUNT_MAX: usize = 100;
+    const BUFFER_SIZE: usize = 4096;
+
+    #[test]
+    fn default() {
+        let cmdline = CString::new("foo bar\\ baz \"car cdr\"").unwrap();
+
+        let mut error_msg: [c_char; ERROR_MSG_SIZE_MAX] =
+            [0; ERROR_MSG_SIZE_MAX];
+        let mut argc: size_t = 0;
+        let mut argv: [*mut c_char; ARGV_COUNT_MAX] =
+            [0 as *mut c_char; ARGV_COUNT_MAX];
+        let mut buffer: [c_char; BUFFER_SIZE] = [0; BUFFER_SIZE];
+
+        unsafe {
+            assert!(super::cmdline(
+                cmdline.as_ptr(),
+                error_msg.as_mut_ptr(),
+                &mut argc,
+                argv.as_mut_ptr(),
+                buffer.as_mut_ptr(),
+                ARGV_COUNT_MAX,
+                BUFFER_SIZE,
+            ));
+        }
+
+        assert_eq!(
+            unsafe { CStr::from_ptr(error_msg.as_ptr()) }
+                .to_str()
+                .unwrap(),
+            "",
+        );
+        assert_eq!(argc, 3);
+        assert_eq!(unsafe { CStr::from_ptr(argv[0]) }.to_str().unwrap(), "foo");
+        assert_eq!(
+            unsafe { CStr::from_ptr(argv[1]) }.to_str().unwrap(),
+            "bar baz",
+        );
+        assert_eq!(
+            unsafe { CStr::from_ptr(argv[2]) }.to_str().unwrap(),
+            "car cdr",
+        );
+    }
+}
diff --git a/pkgs/rust/kernaux-sys/src/lib.rs b/pkgs/rust/kernaux-sys/src/lib.rs
index 102a66f..527cabb 100644
--- a/pkgs/rust/kernaux-sys/src/lib.rs
+++ b/pkgs/rust/kernaux-sys/src/lib.rs
@@ -4,7 +4,9 @@
 extern crate std;
 
 pub mod assert;
+pub mod cmdline;
 pub mod ntoa;
 
 pub use assert::*;
+pub use cmdline::cmdline;
 pub use ntoa::{MAX_PREFIX_LEN as NTOA_MAX_PREFIX_LEN, *};