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79 lines
1.8 KiB
79 lines
1.8 KiB
4 years ago
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "win_logger.h"
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#include <windows.h>
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namespace leveldb {
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void WinLogger::Logv(const char* format, va_list ap) {
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const uint64_t thread_id = static_cast<uint64_t>(::GetCurrentThreadId());
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// We try twice: the first time with a fixed-size stack allocated buffer,
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// and the second time with a much larger dynamically allocated buffer.
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char buffer[500];
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for (int iter = 0; iter < 2; iter++) {
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char* base;
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int bufsize;
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if (iter == 0) {
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bufsize = sizeof(buffer);
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base = buffer;
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} else {
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bufsize = 30000;
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base = new char[bufsize];
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}
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char* p = base;
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char* limit = base + bufsize;
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SYSTEMTIME st;
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// GetSystemTime returns UTC time, we want local time!
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::GetLocalTime(&st);
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p += _snprintf_s(p, limit - p, _TRUNCATE,
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"%04d/%02d/%02d-%02d:%02d:%02d.%03d %llx ",
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st.wYear,
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st.wMonth,
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st.wDay,
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st.wHour,
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st.wMinute,
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st.wSecond,
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st.wMilliseconds,
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static_cast<long long unsigned int>(thread_id));
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// Print the message
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if (p < limit) {
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va_list backup_ap = ap;
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p += vsnprintf(p, limit - p, format, backup_ap);
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va_end(backup_ap);
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}
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// Truncate to available space if necessary
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if (p >= limit) {
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if (iter == 0) {
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continue; // Try again with larger buffer
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} else {
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p = limit - 1;
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}
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}
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// Add newline if necessary
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if (p == base || p[-1] != '\n') {
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*p++ = '\n';
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}
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assert(p <= limit);
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fwrite(base, 1, p - base, file_);
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fflush(file_);
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if (base != buffer) {
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delete[] base;
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}
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break;
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}
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}
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}
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