common/alexcpt.cpp

   1
   2 #include "config.h"
   3
   4 #include "alexcpt.h"
   5
   6 #include <cstdio>
   7 #include <cstdarg>
   8
   9 #include "opthelpers.h"
  10
  11
  12 namespace al {
  13
  14 backend_exception::backend_exception(ALCenum code, const char *msg, ...) : mErrorCode{code}
  15 {
  16     va_list args, args2;
  17     va_start(args, msg);
  18     va_copy(args2, args);
  19     int msglen{std::vsnprintf(nullptr, 0, msg, args)};
  20     if LIKELY(msglen > 0)
  21     {
  22         mMessage.resize(static_cast<size_t>(msglen)+1);
  23         std::vsnprintf(&mMessage[0], mMessage.length(), msg, args2);
  24         mMessage.pop_back();
  25     }
  26     va_end(args2);
  27     va_end(args);
  28 }
  29
  30 } // namespace al