From f96584a2205b5310f317a066475df41f9cf2a8e2 Mon Sep 17 00:00:00 2001
From: Robert Menzel <menzel@informatik.rwth-aachen.de>
Date: Tue, 12 Feb 2013 17:25:32 +0100
Subject: [PATCH] added simple message mirroring to a file and fixed a bug in
 long debug outputs

---
 include/ACGL/Utils/Log.hh | 13 +++++++++++++
 src/ACGL/Utils/Log.cc     | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/include/ACGL/Utils/Log.hh b/include/ACGL/Utils/Log.hh
index 55d162b..500d156 100644
--- a/include/ACGL/Utils/Log.hh
+++ b/include/ACGL/Utils/Log.hh
@@ -62,6 +62,8 @@ public:
     ~CoutLikeStreamBuffer();
 
     void setPrefix( const std::string &_prefix );
+
+    void setFilename( const std::string &_filename);
 private:
 
     //virtual std::streamsize xsputn(const base_type::char_type* s, std::streamsize n)
@@ -74,6 +76,7 @@ private:
     // for each endl:
     virtual int sync();
 
+    void mirrorToFile( const std::string &_token );
 private:
     char  *mBuffer;
 	std::string mPrefix;
@@ -81,6 +84,8 @@ private:
     size_t mBufferMaxSize; // size of the buffer
 
     bool  mNewLineIsAboutToStart;
+    bool  mMirrorToFile;
+    std::string mFilename;
     
 #ifdef __ANDROID__
     android_LogPriority mAndroidPriority;
@@ -138,6 +143,14 @@ public:
             mStreamBuffer->setPrefix(_prefix);
         }
     }
+
+    //! a filename of a text file to mirror all outputs into
+    //! set a filename of "" to disable this
+    void setFilename( const std::string &_filename ) {
+        if (mStreamBuffer) {
+            mStreamBuffer->setFilename(_filename);
+        }
+    }
     void mute()   { rdbuf( NULL ); }
     void unmute() { rdbuf( mStreamBuffer ); }
 private:
diff --git a/src/ACGL/Utils/Log.cc b/src/ACGL/Utils/Log.cc
index c292175..cbec1f1 100644
--- a/src/ACGL/Utils/Log.cc
+++ b/src/ACGL/Utils/Log.cc
@@ -8,6 +8,7 @@
 
 #include <cstdio>
 #include <iostream>
+#include <fstream>
 using namespace ACGL::Utils;
 
 CoutLikeStreamBuffer::CoutLikeStreamBuffer() : base_type() {
@@ -15,6 +16,7 @@ CoutLikeStreamBuffer::CoutLikeStreamBuffer() : base_type() {
     mBufferMaxSize = 256;
     mBuffer        = new char[ mBufferMaxSize+1 ];
     mNewLineIsAboutToStart = true;
+    mMirrorToFile  = false;
 }
 
 CoutLikeStreamBuffer::~CoutLikeStreamBuffer() {
@@ -29,6 +31,29 @@ void CoutLikeStreamBuffer::setPrefix( const std::string &_prefix ) {
     mPrefix = _prefix;
 }
 
+void CoutLikeStreamBuffer::setFilename( const std::string &_filename ) {
+    mFilename = _filename;
+    if (_filename == "") {
+        mMirrorToFile = false;
+    } else {
+        mMirrorToFile = true;
+    }
+}
+
+void CoutLikeStreamBuffer::mirrorToFile( const std::string &_token ) {
+    if (mMirrorToFile == false) {
+        return;
+    }
+
+    // opening and closing the file each time is slow but we don't
+    // loose much in case the app crashes and debugging is the main
+    // usecase for this function!
+    std::ofstream file;
+    file.open( mFilename, std::ios::app );
+    file << _token;
+    file.close();
+}
+
 CoutLikeStreamBuffer::base_type::int_type CoutLikeStreamBuffer::overflow(base_type::int_type ch) {
     // print buffer
     if ((mBufferSize >= mBufferMaxSize) || ( base_type::traits_type::eq_int_type(ch, base_type::traits_type::eof()))) {
@@ -36,6 +61,7 @@ CoutLikeStreamBuffer::base_type::int_type CoutLikeStreamBuffer::overflow(base_ty
         if (mNewLineIsAboutToStart) {
 #ifndef __ANDROID__
             std::cout << mPrefix;
+            mirrorToFile( mPrefix );
 #endif
             mNewLineIsAboutToStart = false;
         }
@@ -45,10 +71,13 @@ CoutLikeStreamBuffer::base_type::int_type CoutLikeStreamBuffer::overflow(base_ty
 	    __android_log_print( mAndroidPriority, mPrefix.c_str(), "%s", mBuffer );
 #else
             std::cout << mBuffer;
+            mirrorToFile( mBuffer );
 #endif
             mBufferSize = 0;
         }
-    } else {
+    }
+
+    if (!( base_type::traits_type::eq_int_type(ch, base_type::traits_type::eof()))) {
         mBuffer[ mBufferSize++ ] = (char) ch;
     }
     return base_type::traits_type::not_eof( ch );
-- 
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