debug utility encapsulating OutputDebugStringA

util.cpp

#include <windows.h>
#include <stdio.h>

#define UID "[yy]"

#define STRINGIZE(x) STRINGIZE2(x)
#define STRINGIZE2(x) #x
#define LINE_STRING STRINGIZE(__LINE__)
#define DEBUG_PREFIX "["__FUNCTION__":"LINE_STRING"] "

void PRINT(const char* fmt, ...);
#ifdef _DEBUG
#define DebugPrint(...) PRINT(UID DEBUG_PREFIX __VA_ARGS__)
#define TracePrint(...) PRINT(UID __VA_ARGS__)
#define DebugPrintAPI(API) \
  DebugPrint(STRINGIZE(API)##" failed, err: 0x%08x\n", GetLastError())
#else
#define DebugPrint(...)
#define TracePrint(...)
#define DebugPrintAPI(API)
#endif

class FunctionTracer {
 public:
  FunctionTracer(char* function) : function_(function) {
    TracePrint("[ENTER][%s]\n", function_);
  }
  ~FunctionTracer() { TracePrint("[EXIT][%s]\n", function_); }

 private:
  char* function_;
};

#define TRACE_FUNCTION FunctionTracer ft(__FUNCTION__);

void PRINT(const char* fmt, ...) {
  va_list args;
  va_start(args, fmt);
  int len = _vscprintf(fmt, args);
  LPSTR buffer = (LPSTR) new TCHAR[len + 1];
  _vsnprintf_s(buffer, len + 1, len, fmt, args);
  va_end(args);
  OutputDebugStringA(buffer);
  delete[] buffer;
}