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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "util/win_logger.h"
#include <windows.h>
namespace leveldb {
void WinLogger::Logv(const char* format, va_list ap) {
const uint64_t thread_id = static_cast<uint64_t>(::GetCurrentThreadId());
// We try twice: the first time with a fixed-size stack allocated buffer,
// and the second time with a much larger dynamically allocated buffer.
char buffer[500];
for (int iter = 0; iter < 2; iter++) {
char* base;
int bufsize;
if (iter == 0) {
bufsize = sizeof(buffer);
base = buffer;
} else {
bufsize = 30000;
base = new char[bufsize];
}
char* p = base;
char* limit = base + bufsize;
SYSTEMTIME st;
// GetSystemTime returns UTC time, we want local time!
::GetLocalTime(&st);
#ifdef _MSC_VER
p += _snprintf_s(p, limit - p, _TRUNCATE,
"%04d/%02d/%02d-%02d:%02d:%02d.%03d %llx ",
st.wYear,
st.wMonth,
st.wDay,
st.wHour,
st.wMinute,
st.wSecond,
st.wMilliseconds,
static_cast<long long unsigned int>(thread_id));
#else
#ifdef __MINGW32__
p += snprintf(p, limit - p,
"%04d/%02d/%02d-%02d:%02d:%02d.%03d %llx ",
st.wYear,
st.wMonth,
st.wDay,
st.wHour,
st.wMinute,
st.wSecond,
st.wMilliseconds,
static_cast<long long unsigned int>(thread_id));
#else
#error Unable to detect Windows compiler (neither _MSC_VER nor __MINGW32__ are set)
#endif
#endif
// Print the message
if (p < limit) {
va_list backup_ap = ap;
p += vsnprintf(p, limit - p, format, backup_ap);
va_end(backup_ap);
}
// Truncate to available space if necessary
if (p >= limit) {
if (iter == 0) {
continue; // Try again with larger buffer
} else {
p = limit - 1;
}
}
// Add newline if necessary
if (p == base || p[-1] != '\n') {
*p++ = '\n';
}
assert(p <= limit);
fwrite(base, 1, p - base, file_);
fflush(file_);
if (base != buffer) {
delete[] base;
}
break;
}
}
}
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