From dad56c39474377c7d47e261b380d0be3aed104cc Mon Sep 17 00:00:00 2001
From: Thomas de Zeeuw <thomasdezeeuw@gmail.com>
Date: Thu, 25 Jul 2019 22:30:52 +0200
Subject: Add {IoSlice, IoSliceMut}::advance

---
 src/libstd/sys/unix/io.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src/libstd/sys/unix/io.rs')

diff --git a/src/libstd/sys/unix/io.rs b/src/libstd/sys/unix/io.rs
index bc854e772e1..a3a72919176 100644
--- a/src/libstd/sys/unix/io.rs
+++ b/src/libstd/sys/unix/io.rs
@@ -21,6 +21,18 @@ impl<'a> IoSlice<'a> {
         }
     }
 
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n {
+            panic!("advancing IoSlice beyond its length");
+        }
+
+        unsafe {
+            self.vec.iov_len -= n;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
     #[inline]
     pub fn as_slice(&self) -> &[u8] {
         unsafe {
@@ -47,6 +59,18 @@ impl<'a> IoSliceMut<'a> {
         }
     }
 
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n {
+            panic!("advancing IoSliceMut beyond its length");
+        }
+
+        unsafe {
+            self.vec.iov_len -= n;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
     #[inline]
     pub fn as_slice(&self) -> &[u8] {
         unsafe {
-- 
cgit 1.4.1-3-g733a5