core/except.cpp

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