util/stream/debug.cpp


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#include "null.h" 
#include "debug.h" 
 
#include <util/string/cast.h> 
#include <util/generic/singleton.h> 
#include <util/generic/yexception.h> 
 
#include <cstdio> 
#include <cstdlib> 
 
void TDebugOutput::DoWrite(const void* buf, size_t len) { 
    if (len != fwrite(buf, 1, len, stderr)) { 
        ythrow yexception() << "write failed(" << LastSystemErrorText() << ")";
    } 
} 
 
namespace { 
    struct TDbgSelector { 
        inline TDbgSelector() { 
            char* dbg = getenv("DBGOUT"); 
            if (dbg) { 
                Out = &Cerr; 
                try { 
                    Level = FromString(dbg); 
                } catch (const yexception&) { 
                    Level = 0; 
                } 
            } else { 
                Out = &Cnull; 
                Level = 0;
            }
        }

        IOutputStream* Out;
        int Level; 
    }; 
} 
 
template <>
struct TSingletonTraits<TDbgSelector> {
    static constexpr size_t Priority = 8;
};

IOutputStream& StdDbgStream() noexcept {
    return *(Singleton<TDbgSelector>()->Out); 
} 

int StdDbgLevel() noexcept {
    return Singleton<TDbgSelector>()->Level;
}