text: /*
   *  Copyright (c) 2020, Ruediger Haertel
   *  All rights reserved.
   *  
   *  Redistribution and use in source and binary forms, with or without
   *  modification, are permitted provided that the following conditions are
   *  met:
   *  
   *  1. Redistributions of source code must retain the above copyright notice,
   *     this list of conditions and the following disclaimer.
   *  
   *  2. Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   *  
   *  3. Neither the name of the copyright holder nor the names of its
   *     contributors may be used to endorse or promote products derived from
   *     this software without specific prior written permission.
   *  
   *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   *  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
   *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <stdarg.h>
  #include <string.h>
  
  #include "log.h"
  
  enum { BufSize = 8192 };
  
  static int s_nLogLevel = LogDebug;
  static char s_Buf[BufSize];
  
  static char* s_szPrefix[] = {
        "" ,
        "[ERROR]  " ,
        "[WARN]   " ,
        "[INFO]   " ,
        "[DEBUG]  " ,
        "\0"
  };
  
  void log_init( int nLevel )
  {
      s_nLogLevel = nLevel;
  }
  
  /***************************************************************************/
  /**
   *
   */
  int log_printf( 
  	int nLevel,
      LOC const *loc,
  	const char *format, 
  	...
      )
  {
      int nPrint = 1;
      va_list ap;
      char *p;
      int nPos = 0;
  
      if( nLevel > s_nLogLevel ) {
  	    nPrint = 0;
      }
  
      if( !nPrint )
      {
          return nPos;
      }
  
      p = s_Buf;
      memset( p, 0, BufSize );
  
      va_start( ap, format );
          if( s_nLogLevel > LogInfo || nLevel < LogInfo) {
              nPos  = sprintf( p, "%s", s_szPrefix[nLevel] );
          }
          if( loc ) {
              nPos += loc_fmt( &p[nPos], sizeof(s_Buf) - nPos, loc );
              p[nPos] = ' ';
              nPos++;
          }
          nPos += vsprintf( &p[nPos], format, ap );
          fputs( p, stderr );
          fputs( "\n", stderr );
      va_end( ap );
  
      return nPos;
  }
  
  