simple logging to file

log.c

#include <stdarg.h>
#include <stdio.h>

static void log( char* string, ... )
{
  va_list parameter;
  char output[256];
  FILE *f;

  va_start( parameter, string );
  vsnprintf( output, 255, string, parameter );
  
  f = fopen( "output.log", "at" );
  fprintf( f, "%s\n", output );
  fclose( f );
}