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Log all output to file

/ Published in: C
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With the code fragment below, you can easily add output logging to a text-based program. Add the functions, open the log file and replace calls to (f)printf by (f)printflog.

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  1. FILE *log= NULL;
  2.  
  3. int printflog( const char *format, ... )
  4. {
  5.   va_list arglist;
  6.   int ret;
  7.  
  8.   va_start(arglist, format);
  9.   ret= vprintf(format, arglist);
  10.   if( log )
  11.     vfprintf(log, format, arglist);
  12.   return ret;
  13. }
  14.  
  15. int fprintflog( FILE *stream, const char *format, ... )
  16. {
  17.   va_list arglist;
  18.   int ret;
  19.  
  20.   va_start(arglist, format);
  21.   ret= vfprintf(stream, format, arglist);
  22.   if( log )
  23.     vfprintf(log, format, arglist);
  24.   return ret;
  25. }

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