intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 50 insertions, 0 deletions

diff --git a/util/stream/debug.cpp b/util/stream/debug.cpp
new file mode 100644
index 00000000000..afd5b3e1c73
--- /dev/null
+++ b/util/stream/debug.cpp
@@ -0,0 +1,50 @@
+#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;
+}