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// Copyright 2022 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: log/internal/log_format.h
// -----------------------------------------------------------------------------
//
// This file declares routines implementing formatting of log message and log
// prefix.
#ifndef ABSL_LOG_INTERNAL_LOG_FORMAT_H_
#define ABSL_LOG_INTERNAL_LOG_FORMAT_H_
#include <stddef.h>
#include <string>
#include "absl/base/config.h"
#include "absl/base/log_severity.h"
#include "absl/log/internal/config.h"
#include "absl/strings/string_view.h"
#include "absl/time/civil_time.h"
#include "absl/time/time.h"
#include "absl/types/span.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace log_internal {
enum class PrefixFormat {
kNotRaw,
kRaw,
};
// Formats log message based on provided data.
std::string FormatLogMessage(absl::LogSeverity severity,
absl::CivilSecond civil_second,
absl::Duration subsecond, log_internal::Tid tid,
absl::string_view basename, int line,
PrefixFormat format, absl::string_view message);
// Formats various entry metadata into a text string meant for use as a
// prefix on a log message string. Writes into `buf`, advances `buf` to point
// at the remainder of the buffer (i.e. past any written bytes), and returns the
// number of bytes written.
//
// In addition to calling `buf->remove_prefix()` (or the equivalent), this
// function may also do `buf->remove_suffix(buf->size())` in cases where no more
// bytes (i.e. no message data) should be written into the buffer. For example,
// if the prefix ought to be:
// I0926 09:00:00.000000 1234567 foo.cc:123]
// `buf` is too small, the function might fill the whole buffer:
// I0926 09:00:00.000000 1234
// (note the apparrently incorrect thread ID), or it might write less:
// I0926 09:00:00.000000
// In this case, it might also empty `buf` prior to returning to prevent
// message data from being written into the space where a reader would expect to
// see a thread ID.
size_t FormatLogPrefix(absl::LogSeverity severity, absl::Time timestamp,
log_internal::Tid tid, absl::string_view basename,
int line, PrefixFormat format, absl::Span<char>& buf);
} // namespace log_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_LOG_INTERNAL_LOG_FORMAT_H_
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