From 1359439da825b15afcff93014123b75e2df2e84b Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Wed, 22 Aug 2012 17:03:57 -0700
Subject: [PATCH] libcore: Add from_buf_len_nocopy

---
 src/libcore/str.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/libcore/str.rs b/src/libcore/str.rs
index 5f1c100a15507..ec61ace2f1305 100644
--- a/src/libcore/str.rs
+++ b/src/libcore/str.rs
@@ -1768,6 +1768,7 @@ mod unsafe {
    export
       from_buf,
       from_buf_len,
+      from_buf_len_nocopy,
       from_c_str,
       from_c_str_len,
       from_bytes,
@@ -1799,6 +1800,13 @@ mod unsafe {
         return ::unsafe::transmute(v);
     }
 
+    /// Create a Rust string from a *u8 buffer of the given length without copying
+    unsafe fn from_buf_len_nocopy(buf: &a / *u8, len: uint) -> &a / str {
+        let v = (*buf, len + 1);
+        assert is_utf8(::unsafe::reinterpret_cast(v));
+        return ::unsafe::transmute(v);
+    }
+
     /// Create a Rust string from a null-terminated C string
     unsafe fn from_c_str(c_str: *libc::c_char) -> ~str {
         from_buf(::unsafe::reinterpret_cast(c_str))