LogSingleton.cc

   1 /*
   2  * Copyright (c) 2002, Robert Collins..
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     A copy of the GNU General Public License can be found at
  10  *     http://www.gnu.org/
  11  *
  12  * Written by Robert Collins <rbtcollins@hotmail.com>
  13  *
  14  */
  15
  16 #include "LogSingleton.h"
  17 #include <stdexcept>
  18 #include <stdarg.h>
  19
  20 /* Helper functions */
  21
  22 /* End of a Log comment */
  23 std::ostream& endLog(std::ostream& outs)
  24 {
  25   /* Doesn't seem to be any way around this */
  26   dynamic_cast<LogSingleton &>(outs).endEntry();
  27   return outs;
  28 }
  29
  30 /* The LogSingleton class */
  31
  32 LogSingleton * LogSingleton::theInstance(0);
  33
  34 LogSingleton::LogSingleton(std::streambuf* aStream) : std::ios (aStream), std::ostream (aStream)
  35 {
  36     std::ios::init (aStream);
  37 }
  38 LogSingleton::~LogSingleton(){}
  39
  40 LogSingleton &
  41 LogSingleton::GetInstance()
  42 {
  43   if (!theInstance)
  44     throw new std::invalid_argument ("No instance has been set!");
  45   return *theInstance;
  46 }
  47
  48 void
  49 LogSingleton::SetInstance(LogSingleton &newInstance)
  50 {
  51   theInstance = &newInstance;
  52 }
  53
  54 #if 0
  55 // Logging class. Default logging level is PLAIN.
  56 class LogSingleton : public std::ostream
  57 {
  58 public:
  59   // Singleton support
  60   /* Some platforms don't call destructors. So this call exists
  61    * which guarantees to flush any log data...
  62    * but doesn't call generic C++ destructors
  63    */
  64   virtual void exit (int const exit_code) __attribute__ ((noreturn));
  65   // get a specific verbosity stream.
  66   virtual ostream &operator() (enum log_level level);
  67
  68   friend ostream& endLog(ostream& outs);
  69
  70 protected:
  71   LogSingleton (LogSingleton const &); // no copy constructor
  72   LogSingleton &operator = (LogSingleton const&); // no assignment operator
  73   void endEntry(); // the current in-progress entry is complete.
  74 private:
  75   static LogSingleton *theInstance;
  76 };
  77 #endif
  78
  79 // Log adapators for printf-style output
  80 void
  81 LogBabblePrintf(const char *fmt, ...)
  82 {
  83   int len;
  84   char buf[2000];
  85   va_list args;
  86   va_start (args, fmt);
  87   len = vsnprintf (buf, 2000, fmt, args);
  88   if ((len > 0) && (buf[len-1] == '\n'))
  89     buf[len-1] = 0;
  90   Log (LOG_BABBLE) << buf << endLog;
  91 }
  92
  93 void
  94 LogPlainPrintf(const char *fmt, ...)
  95 {
  96   int len;
  97   char buf[2000];
  98   va_list args;
  99   va_start (args, fmt);
 100   len = vsnprintf (buf, 2000, fmt, args);
 101   if ((len > 0) && (buf[len-1] == '\n'))
 102     buf[len-1] = 0;
 103   Log (LOG_PLAIN) << buf << endLog;
 104 }