std:rt: args module is not used by win/mac. #7951

src/libstd/rt/args.rs

@@ -14,56 +14,86 @@
 //! the processes `argc` and `argv` arguments to be stored
 //! in a globally-accessible location for use by the `os` module.
 //!
+//! Only valid to call on linux. Mac and Windows use syscalls to
+//! discover the command line arguments.
+//!
 //! XXX: Would be nice for this to not exist.
 //! XXX: This has a lot of C glue for lack of globals.
 
-use libc;
-use option::{Option, Some, None};
-use str;
-use uint;
-use unstable::finally::Finally;
-use util;
+use option::Option;
 
 /// One-time global initialization.
 pub unsafe fn init(argc: int, argv: **u8) {
-    let args = load_argc_and_argv(argc, argv);
-    put(args);
+    imp::init(argc, argv)
 }
 
 /// One-time global cleanup.
 pub fn cleanup() {
-    rtassert!(take().is_some());
+    imp::cleanup()
 }
 
 /// Take the global arguments from global storage.
 pub fn take() -> Option<~[~str]> {
-    with_lock(|| unsafe {
-        let ptr = get_global_ptr();
-        let val = util::replace(&mut *ptr, None);
-        val.map(|s: &~~[~str]| (**s).clone())
-    })
+    imp::take()
 }
 
 /// Give the global arguments to global storage.
 ///
 /// It is an error if the arguments already exist.
 pub fn put(args: ~[~str]) {
+    imp::put(args)
+}
+
+/// Make a clone of the global arguments.
+pub fn clone() -> Option<~[~str]> {
+    imp::clone()
+}
+
+#[cfg(target_os = "linux")]
+#[cfg(target_os = "android")]
+#[cfg(target_os = "freebsd")]
+mod imp {
+
+    use libc;
+    use option::{Option, Some, None};
+    use str;
+    use uint;
+    use unstable::finally::Finally;
+    use util;
+
+    pub unsafe fn init(argc: int, argv: **u8) {
+        let args = load_argc_and_argv(argc, argv);
+        put(args);
+    }
+
+    pub fn cleanup() {
+        rtassert!(take().is_some());
+    }
+
+    pub fn take() -> Option<~[~str]> {
+        with_lock(|| unsafe {
+            let ptr = get_global_ptr();
+            let val = util::replace(&mut *ptr, None);
+            val.map(|s: &~~[~str]| (**s).clone())
+        })
+    }
+
+    pub fn put(args: ~[~str]) {
         with_lock(|| unsafe {
             let ptr = get_global_ptr();
             rtassert!((*ptr).is_none());
             (*ptr) = Some(~args.clone());
         })
-}
+    }
 
-/// Make a clone of the global arguments.
-pub fn clone() -> Option<~[~str]> {
+    pub fn clone() -> Option<~[~str]> {
         with_lock(|| unsafe {
             let ptr = get_global_ptr();
             (*ptr).map(|s: &~~[~str]| (**s).clone())
         })
-}
+    }
 
-fn with_lock<T>(f: &fn() -> T) -> T {
+    fn with_lock<T>(f: &fn() -> T) -> T {
         do (|| {
             unsafe {
                 rust_take_global_args_lock();
@@ -74,29 +104,29 @@ fn with_lock<T>(f: &fn() -> T) -> T {
                 rust_drop_global_args_lock();
             }
         }
-}
+    }
 
-fn get_global_ptr() -> *mut Option<~~[~str]> {
+    fn get_global_ptr() -> *mut Option<~~[~str]> {
         unsafe { rust_get_global_args_ptr() }
-}
+    }
 
-// Copied from `os`.
-unsafe fn load_argc_and_argv(argc: int, argv: **u8) -> ~[~str] {
+    // Copied from `os`.
+    unsafe fn load_argc_and_argv(argc: int, argv: **u8) -> ~[~str] {
         let mut args = ~[];
         for uint::range(0, argc as uint) |i| {
             args.push(str::raw::from_c_str(*(argv as **libc::c_char).offset(i)));
         }
         return args;
-}
+    }
 
-extern {
+    extern {
         fn rust_take_global_args_lock();
         fn rust_drop_global_args_lock();
         fn rust_get_global_args_ptr() -> *mut Option<~~[~str]>;
-}
+    }
 
-#[cfg(test)]
-mod tests {
+    #[cfg(test)]
+    mod tests {
         use option::{Some, None};
         use super::*;
         use unstable::finally::Finally;
@@ -122,4 +152,28 @@ mod tests {
                 }
             }
         }
+    }
+}
+
+#[cfg(target_os = "macos")]
+#[cfg(target_os = "win32")]
+mod imp {
+
+    pub unsafe fn init(_argc: int, _argv: **u8) {
+    }
+
+    pub fn cleanup() {
+    }
+
+    pub fn take() -> Option<~[~str]> {
+        fail!()
+    }
+
+    pub fn put(_args: ~[~str]) {
+        fail!()
+    }
+
+    pub fn clone() -> Option<~[~str]> {
+        fail!()
+    }
 }