Refactor unix backtracing. NFC.

1 files changed, 35 insertions, 0 deletions

diff --git a/src/libstd/sys/unix/backtrace/printing/dladdr.rs b/src/libstd/sys/unix/backtrace/printing/dladdr.rs
new file mode 100644
index 00000000000..fc7894a97b0
--- /dev/null
+++ b/src/libstd/sys/unix/backtrace/printing/dladdr.rs
@@ -0,0 +1,35 @@
+// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+pub fn print(w: &mut Write, idx: isize, addr: *mut libc::c_void,
+             _symaddr: *mut libc::c_void) -> io::Result<()> {
+    use sys::backtrace::{output};
+    use intrinsics;
+    #[repr(C)]
+    struct Dl_info {
+        dli_fname: *const libc::c_char,
+        dli_fbase: *mut libc::c_void,
+        dli_sname: *const libc::c_char,
+        dli_saddr: *mut libc::c_void,
+    }
+    extern {
+        fn dladdr(addr: *const libc::c_void,
+                  info: *mut Dl_info) -> libc::c_int;
+    }
+
+    let mut info: Dl_info = unsafe { intrinsics::init() };
+    if unsafe { dladdr(addr, &mut info) == 0 } {
+        output(w, idx,addr, None)
+    } else {
+        output(w, idx, addr, Some(unsafe {
+            CStr::from_ptr(info.dli_sname).to_bytes()
+        }))
+    }
+}