std: Move a plattform-specific constant to sys::stdio

3 files changed, 8 insertions, 0 deletions

diff --git a/src/libstd/sys/common/io.rs b/src/libstd/sys/common/io.rs
index 0483725dd83..23daeeb5187 100644
--- a/src/libstd/sys/common/io.rs
+++ b/src/libstd/sys/common/io.rs
@@ -12,6 +12,8 @@ use io::ErrorKind;
 use io::Read;
 use slice::from_raw_parts_mut;
 
+pub const DEFAULT_BUF_SIZE: usize = 8 * 1024;
+
 // Provides read_to_end functionality over an uninitialized buffer.
 // This function is unsafe because it calls the underlying
 // read function with a slice into uninitialized memory. The default
diff --git a/src/libstd/sys/unix/stdio.rs b/src/libstd/sys/unix/stdio.rs
index 947ba2cc752..273341b1918 100644
--- a/src/libstd/sys/unix/stdio.rs
+++ b/src/libstd/sys/unix/stdio.rs
@@ -67,3 +67,4 @@ impl io::Write for Stderr {
 }
 
 pub const EBADF_ERR: i32 = ::libc::EBADF as i32;
+pub const STDIN_BUF_SIZE: usize = ::sys_common::io::DEFAULT_BUF_SIZE;
diff --git a/src/libstd/sys/windows/stdio.rs b/src/libstd/sys/windows/stdio.rs
index 5f097d2631d..72788776ded 100644
--- a/src/libstd/sys/windows/stdio.rs
+++ b/src/libstd/sys/windows/stdio.rs
@@ -207,3 +207,8 @@ fn invalid_encoding() -> io::Error {
 }
 
 pub const EBADF_ERR: i32 = ::sys::c::ERROR_INVALID_HANDLE as i32;
+// The default buffer capacity is 64k, but apparently windows
+// doesn't like 64k reads on stdin. See #13304 for details, but the
+// idea is that on windows we use a slightly smaller buffer that's
+// been seen to be acceptable.
+pub const STDIN_BUF_SIZE: usize = 8 * 1024;