rollup merge of #20612: retep998/winsize

This calculates the width and height using the bounding box of the window in the buffer. Bounding box coordinates are inclusive so I have to add 1 to both dimensions.

Author: alexcrichton

src/libstd/sys/windows/c.rs

@@ -84,6 +84,32 @@ pub fn fd_set(set: &mut fd_set, s: libc::SOCKET) {
     set.fd_count += 1;
 }
 
+pub type SHORT = libc::c_short;
+
+#[repr(C)]
+pub struct COORD {
+    pub X: SHORT,
+    pub Y: SHORT,
+}
+
+#[repr(C)]
+pub struct SMALL_RECT {
+    pub Left: SHORT,
+    pub Top: SHORT,
+    pub Right: SHORT,
+    pub Bottom: SHORT,
+}
+
+#[repr(C)]
+pub struct CONSOLE_SCREEN_BUFFER_INFO {
+    pub dwSize: COORD,
+    pub dwCursorPosition: COORD,
+    pub wAttributes: libc::WORD,
+    pub srWindow: SMALL_RECT,
+    pub dwMaximumWindowSize: COORD,
+}
+pub type PCONSOLE_SCREEN_BUFFER_INFO = *mut CONSOLE_SCREEN_BUFFER_INFO;
+
 #[link(name = "ws2_32")]
 extern "system" {
     pub fn WSAStartup(wVersionRequested: libc::WORD,
@@ -246,4 +272,8 @@ extern "system" {
 
     pub fn SetConsoleMode(hConsoleHandle: libc::HANDLE,
                           lpMode: libc::DWORD) -> libc::BOOL;
+    pub fn GetConsoleScreenBufferInfo(
+        hConsoleOutput: libc::HANDLE,
+        lpConsoleScreenBufferInfo: PCONSOLE_SCREEN_BUFFER_INFO,
+    ) -> libc::BOOL;
 }

src/libstd/sys/windows/tty.rs

@@ -32,13 +32,15 @@ use iter::repeat;
 use libc::types::os::arch::extra::LPCVOID;
 use libc::{c_int, HANDLE, LPDWORD, DWORD, LPVOID};
 use libc::{get_osfhandle, CloseHandle};
+use mem;
 use ptr;
 use str::from_utf8;
 use super::c::{ENABLE_ECHO_INPUT, ENABLE_EXTENDED_FLAGS};
 use super::c::{ENABLE_INSERT_MODE, ENABLE_LINE_INPUT};
 use super::c::{ENABLE_PROCESSED_INPUT, ENABLE_QUICK_EDIT_MODE};
-use super::c::{ERROR_ILLEGAL_CHARACTER};
+use super::c::{ERROR_ILLEGAL_CHARACTER, CONSOLE_SCREEN_BUFFER_INFO};
 use super::c::{ReadConsoleW, WriteConsoleW, GetConsoleMode, SetConsoleMode};
+use super::c::{GetConsoleScreenBufferInfo};
 
 fn invalid_encoding() -> IoError {
     IoError {
@@ -146,12 +148,12 @@ impl TTY {
     }
 
     pub fn get_winsize(&mut self) -> IoResult<(int, int)> {
-        // FIXME
-        // Get console buffer via CreateFile with CONOUT$
-        // Make a CONSOLE_SCREEN_BUFFER_INFO
-        // Call GetConsoleScreenBufferInfo
-        // Maybe call GetLargestConsoleWindowSize instead?
-        Err(super::unimpl())
+        let mut info: CONSOLE_SCREEN_BUFFER_INFO = unsafe { mem::zeroed() };
+        match unsafe { GetConsoleScreenBufferInfo(self.handle, &mut info as *mut _) } {
+            0 => Err(super::last_error()),
+            _ => Ok(((info.srWindow.Right + 1 - info.srWindow.Left) as int,
+                     (info.srWindow.Bottom + 1 - info.srWindow.Top) as int)),
+        }
     }
 
     // Let us magically declare this as a TTY