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output.h

// Copyright 2017 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.
//
// Output extension hooks for the Format library.
// `internal::InvokeFlush` calls the appropriate flush function for the
// specified output argument.
// `BufferRawSink` is a simple output sink for a char buffer. Used by SnprintF.
// `FILERawSink` is a std::FILE* based sink. Used by PrintF and FprintF.

#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
#define ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_

#include <cstdio>
#include <ios>
#include <ostream>
#include <string>

#include "absl/base/port.h"
#include "absl/strings/string_view.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace str_format_internal {

// RawSink implementation that writes into a char* buffer.
// It will not overflow the buffer, but will keep the total count of chars
// that would have been written.
class BufferRawSink {
 public:
  BufferRawSink(char* buffer, size_t size) : buffer_(buffer), size_(size) {}

size_t total_written() const { return total_written_; }
  void Write(string_view v);

private:
  char* buffer_;
  size_t size_;
  size_t total_written_ = 0;
};

// RawSink implementation that writes into a FILE*.
// It keeps track of the total number of bytes written and any error encountered
// during the writes.
class FILERawSink {
 public:
  explicit FILERawSink(std::FILE* output) : output_(output) {}

void Write(string_view v);

size_t count() const { return count_; }
  int error() const { return error_; }

private:
  std::FILE* output_;
  int error_ = 0;
  size_t count_ = 0;
};

// Provide RawSink integration with common types from the STL.
inline void AbslFormatFlush(std::string* out, string_view s) {
  out->append(s.data(), s.size());
}
inline void AbslFormatFlush(std::ostream* out, string_view s) {
  out->write(s.data(), static_cast<std::streamsize>(s.size()));
}

inline void AbslFormatFlush(FILERawSink* sink, string_view v) {
  sink->Write(v);
}

inline void AbslFormatFlush(BufferRawSink* sink, string_view v) {
  sink->Write(v);
}

// This is a SFINAE to get a better compiler error message when the type
// is not supported.
template <typename T>
auto InvokeFlush(T* out, string_view s) -> decltype(AbslFormatFlush(out, s)) {
  AbslFormatFlush(out, s);
}

}  // namespace str_format_internal
ABSL_NAMESPACE_END
}  // namespace absl

#endif  // ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	0/0	0755	2025-04-18 10:10:21
..	dir	-	0/0	0755	2025-04-18 10:10:21
arg.h	text/x-c++	27.14 KB	0/0	0644	2025-02-03 04:50:45
bind.h	text/x-c++	7.95 KB	0/0	0644	2025-02-03 04:50:45
checker.h	text/x-c++	3.1 KB	0/0	0644	2025-02-03 04:50:45
constexpr_parser.h	text/x-c++	13.27 KB	0/0	0644	2025-02-03 04:50:45
extension.h	text/x-c++	14 KB	0/0	0644	2025-02-03 04:50:45
float_conversion.h	text/x-c++	1.31 KB	0/0	0644	2025-02-03 04:50:45
output.h	text/x-c++	2.85 KB	0/0	0644	2025-02-03 04:50:45
parser.h	text/x-c++	9.67 KB	0/0	0644	2025-02-03 04:50:45