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Std:string formatter

/ Published in: C++
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  1. std::string format_arg_list(const char *fmt, va_list args)
  2. {
  3.     if (!fmt) return "";
  4.     int   result = -1, length = 256;
  5.     char *buffer = 0;
  6.     while (result == -1)
  7.     {
  8.         if (buffer) delete [] buffer;
  9.         buffer = new char [length + 1];
  10.         memset(buffer, 0, length + 1);
  11.         result = _vsnprintf(buffer, length, fmt, args);
  12.         length *= 2;
  13.     }
  14.     std::string s(buffer);
  15.     delete [] buffer;
  16.     return s;
  17. }
  18.  
  19. std::string format(const char *fmt, ...)
  20. {
  21.     va_list args;
  22.     va_start(args, fmt);
  23.     std::string s = format_arg_list(fmt, args);
  24.     va_end(args);
  25.     return s;
  26. }

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