split out winsize from sys_ioctl header

src/header/bits_winsize/cbindgen.toml

@@ -0,0 +1,13 @@
+# POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/termios.h.html
+#
+# This type is split out to include it in the following headers:
+# - sys/ioctl.h (Non-POSIX)
+# - termios.h (POSIX, where it should be defined)
+include_guard = "_RELIBC_BITS_WINSIZE_H"
+language = "C"
+style = "Tag"
+no_includes = true
+cpp_compat = true
+
+[export]
+include = ["winsize"]

src/header/bits_winsize/mod.rs

@@ -0,0 +1,16 @@
+use crate::platform::types::c_ushort;
+
+#[repr(C)]
+#[derive(Default)]
+pub struct winsize {
+    ws_row: c_ushort,
+    ws_col: c_ushort,
+    ws_xpixel: c_ushort,
+    ws_ypixel: c_ushort,
+}
+
+impl winsize {
+    pub fn get_row_col(&self) -> (c_ushort, c_ushort) {
+        (self.ws_row, self.ws_col)
+    }
+}