log_file

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.
 
#ifndef tools_log_file
#define tools_log_file
 
#include <cstdio>
 
#include "sys/process"
#include "sprintf"
 
namespace tools {
 
class log_file {
public:
  static log_file& get() {
    static log_file s_log_file;
    return s_log_file;
  }
private:
  log_file():m_FILE(0) {
#ifdef _WIN32
#if defined(_MSC_VER) && _MSC_VER < 1900
    std::string file_name("C:\\cygwin\\tmp\\inlib_log_file_");
#else
    std::string file_name("C:\\cygwin64\\tmp\\inlib_log_file_");
#endif
#else
    std::string file_name("/tmp/inlib_log_file_");
#endif
    std::string spid;
    sprintf(spid,128,"%d",process_id());
    file_name += spid;
    m_FILE = ::fopen(file_name.c_str(),"wb");
  }
  ~log_file() {if(m_FILE) ::fclose(m_FILE);}
protected:
  log_file(const log_file&):m_FILE(0) {}
  log_file& operator=(const log_file&) {return *this;}
public:
  void close() {if(m_FILE) ::fclose(m_FILE);m_FILE = 0;}
  void write(const std::string& a_string) const {
    if(!m_FILE) return;
    if(::fprintf(m_FILE,"%s",a_string.c_str())<0) {}
  }
  void writef(const char* a_format,...) const {
    if(!m_FILE) return;
    std::string s;
    va_list args;
    va_start(args,a_format);
    if(vsprintf(s,1000,a_format,args)) write(s);
    va_end(args);
  }
protected:
  FILE* m_FILE;
};
 
}
 
#endif