log.H

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/*
                          Aleph_w
 
  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2026 Leandro Rabindranath Leon
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
 
 
# ifndef LOG_H
# define LOG_H
 
# include <sys/utsname.h>
# include <errno.h>
# include <stdio.h>
# include <stdarg.h>
# include <string.h>
# include <useMutex.H>
 
class Log_Manager
{
  static const short int Max_Log_Line_Length  = 512;  
  static const short int Max_Time_Line_Length = 61;   
 
  FILE * file_descriptor;  
 
  pthread_mutex_t mutex;   
 
  char print_buffer[Max_Log_Line_Length];   
  char time_buffer[Max_Time_Line_Length];   
 
  size_t num_lines;      
  size_t max_num_lines;  
 
  void get_time()
  {
    time_t unix_time;
    time(&unix_time);
      
    struct tm broken_time;
    localtime_r(&unix_time, &broken_time); 
 
    strftime(time_buffer, Max_Time_Line_Length, "%a %b %d %G %r", 
       &broken_time);
  }
 
public:
 
  Log_Manager(FILE * _file_descriptor)
    : file_descriptor(_file_descriptor)
  {
    init_mutex(mutex);
    struct utsname site_info;
    uname(&site_info);
  }
 
  ~Log_Manager()
  {
    destroy_mutex(mutex);
  }
 
  void init_line(
# ifdef DEBUG
      char * file, 
      int line, 
# endif
      const char *format, ...)
  {
    va_list ap;
 
    va_start(ap, format);
    {
      CRITICAL_SECTION(mutex);
 
      get_time();
 
# ifdef DEBUG
      fprintf(file_descriptor, "%s (%s:%d:%ld:%d) : ", 
        time_buffer, file, line, pthread_self(), getpid());
# else
      fprintf(file_descriptor, "%s (%ld:%d): ", 
        time_buffer, pthread_self(), getpid()); 
# endif
      vfprintf(file_descriptor, format, ap);
    }
    va_end(ap);
  }
 
  void write_line(
# ifdef DEBUG
      char * file, 
      int line, 
# endif
      const char *format, ...)
  {
    va_list ap;
 
    va_start(ap, format);
    {
      CRITICAL_SECTION(mutex);
 
      get_time();
 
# ifdef DEBUG
      fprintf(file_descriptor, "%s (%s:%d:%ld:%d) : ", 
        time_buffer, file, line, pthread_self(), getpid());
# else
      fprintf(file_descriptor, "%s (%ld:%d): ", 
        time_buffer, pthread_self(), getpid());
# endif
      vfprintf(file_descriptor, format, ap);
      fprintf(file_descriptor, "\n");
    }
    va_end(ap);
  }
 
 
};
 
# ifdef DEBUG
# define WRITE_IN_LOG(log, format...) log.write_line(__FILE__, __LINE__, format)
# else
# define WRITE_IN_LOG(log, format...) log.write_line(format)
# endif
 
# endif // LOG_H