std: Fix newsched logging truncation

The truncation needs to be done in the console logger in order
to catch all the logging output, and because truncation only matters
when outputting to the console.

1 files changed, 17 insertions, 4 deletions

diff --git a/src/libstd/rt/logging.rs b/src/libstd/rt/logging.rs
index 11d11daebc2..9056f0d52e0 100644
--- a/src/libstd/rt/logging.rs
+++ b/src/libstd/rt/logging.rs
@@ -10,6 +10,7 @@
 
 use either::*;
 use libc;
+use str::StrSlice;
 
 pub trait Logger {
     fn log(&mut self, msg: Either<~str, &'static str>);
@@ -35,10 +36,22 @@ impl Logger for StdErrLogger {
                 s
             }
         };
-        let dbg = ::libc::STDERR_FILENO as ::io::fd_t;
-        dbg.write_str(s);
-        dbg.write_str("\n");
-        dbg.flush();
+
+        // Truncate the string
+        let buf_bytes = 256;
+        if s.len() > buf_bytes {
+            let s = s.slice(0, buf_bytes) + "[...]";
+            print(s);
+        } else {
+            print(s)
+        };
+
+        fn print(s: &str) {
+            let dbg = ::libc::STDERR_FILENO as ::io::fd_t;
+            dbg.write_str(s);
+            dbg.write_str("\n");
+            dbg.flush();
+        }
     }
 }