use iostream instead of printf (#977)

* use iostream instead of printf

* fixes from PR, add reserve to strings

Author: va-kuznecov

ydb/core/base/logoblob.cpp

@@ -1,35 +1,26 @@
 #include "logoblob.h"
 #include <ydb/core/protos/base.pb.h>
-#include <util/string/printf.h>
 
 namespace NKikimr {
 
 TString TLogoBlobID::ToString() const {
-    return Sprintf(
-        "[%" PRIu64 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 "]",
-        TabletID(),
-        Generation(),
-        Step(),
-        Channel(),
-        Cookie(),
-        BlobSize(),
-        PartId()).data();
+    TString str;
+    str.reserve(64);
+    TStringOutput outStr(str);
+    Out(outStr);
+    return str;
 }
 
 void TLogoBlobID::Out(IOutputStream &o) const {
-    char buf[240];
-    snprintf(buf, sizeof(buf),
-        "[%" PRIu64 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 "]",
-        TabletID(),
-        Generation(),
-        Step(),
-        Channel(),
-        Cookie(),
-        BlobSize(),
-        PartId()
-    );
-
-    o << buf;
+    o << '['
+        << TabletID() << ':'
+        << Generation() << ':'
+        << Step() << ':'
+        << Channel() << ':'
+        << Cookie() << ':'
+        << BlobSize() << ':'
+        << PartId()
+        << ']' ;
 }
 
 void TLogoBlobID::Out(IOutputStream &o, const TVector<TLogoBlobID> &vec) {

ydb/core/base/traceid.cpp

@@ -20,16 +20,15 @@ TTraceID TTraceID::GenerateNew() {
 }
 
 TString TTraceID::ToString() const {
-    TString result;
-    TStringOutput out(result);
-    Out(out);
-    return result;
+    TString str;
+    str.reserve(128);
+    TStringOutput outStr(str);
+    Out(outStr);
+    return str;
 }
 
 void TTraceID::Out(IOutputStream &o) const {
-    char buf[240];
-    snprintf(buf, sizeof(buf), "[ID:%" PRIu64 ", Created: %s]", RandomID, TInstant::MicroSeconds(CreationTime).ToRfc822StringLocal().data());
-    o << buf;
+    o << "[ID: " << RandomID << ", " << "Created: " << TInstant::MicroSeconds(CreationTime).ToRfc822StringLocal() << "]";
 }
 
 bool TTraceID::operator<(const TTraceID &x) const {