Fix a test tool for OTS, ot-sanitise....

test/file-stream.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef OTS_FILE_STREAM_H_
 #define OTS_FILE_STREAM_H_
 
 #include "opentype-sanitiser.h"
 
 namespace ots {
 
+// An OTSStream implementation for testing.
 class FILEStream : public OTSStream {
  public:
   explicit FILEStream(FILE *stream)
-      : file_(stream) {
+      : file_(stream), position_(0) {
   }
 
   ~FILEStream() {
   }
 
   bool WriteRaw(const void *data, size_t length) {
-    return fwrite(data, length, 1, file_) == 1;
+    if (::fwrite(data, length, 1, file_) == 1) {

[Evan Martin, 2009/11/23 17:44:19]

Does this function succeed when writing to /dev/null? 

[Yusuke Sato, 2009/11/23 17:59:24]

Yes, at least on Linux 2.6.

+      position_ += length;
+      return true;
+    }
+    return false;
   }
 
   bool Seek(off_t position) {
-    return fseek(file_, position, SEEK_SET) == 0;
+    if (!::fseeko(file_, position, SEEK_SET)) {
+      position_ = position;
+      return true;
+    }
+    return false;
   }
 
   off_t Tell() const {
-    return ftell(file_);
+    return position_;
   }
 
  private:
   FILE * const file_;
+  off_t position_;
 };
 
 }  // namespace ots
 
 #endif  // OTS_FILE_STREAM_H_