From 4491d606df34c44efda47b6d17b605262f17e182 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Thu, 21 Jun 2018 12:55:12 -0700 Subject: Export of internal Abseil changes. -- 70f43a482d7d4ae4a255f17ca02b0106653dd600 by Shaindel Schwartz : Internal change PiperOrigin-RevId: 201571193 -- 93e6e9c2e683158be49d9dd1f5cb1a91d0c0f556 by Abseil Team : Internal change. PiperOrigin-RevId: 201567108 -- fbd8ee94fbe9f2448e5adf5e88706f9c8216048f by Juemin Yang : str_format release PiperOrigin-RevId: 201565129 -- 387faa301555a8a888c4429df52734aa806dca46 by Abseil Team : Adds a defaulted allocator parameter to the size_type constructor of InlinedVector PiperOrigin-RevId: 201558711 -- 39b15ea2c68d7129d70cbde7e71af900032595ec by Matt Calabrese : Update the variant implementation to eliminate unnecessary checking on alternative access when the index is known or required to be correct. PiperOrigin-RevId: 201529535 -- adab77f1f7bb363aa534297f22aae2b0f08889ea by Abseil Team : Import of CCTZ from GitHub. PiperOrigin-RevId: 201458388 -- a701dc0ba62e3cadf0de14203415b91df4ee8151 by Greg Falcon : Internal cleanup PiperOrigin-RevId: 201394836 -- 8a7191410b8f440fdfa27f722ff05e451502ab61 by Abseil Team : Import of CCTZ from GitHub. PiperOrigin-RevId: 201369269 GitOrigin-RevId: 70f43a482d7d4ae4a255f17ca02b0106653dd600 Change-Id: I8ab073b30b4e27405a3b6da2c826bb4f3f0b9af6 --- absl/strings/internal/str_format/output.h | 101 ++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 absl/strings/internal/str_format/output.h (limited to 'absl/strings/internal/str_format/output.h') diff --git a/absl/strings/internal/str_format/output.h b/absl/strings/internal/str_format/output.h new file mode 100644 index 000000000000..3b0aa5e7157e --- /dev/null +++ b/absl/strings/internal/str_format/output.h @@ -0,0 +1,101 @@ +// 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 +// +// http://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 +#include +#include + +#include "absl/base/port.h" +#include "absl/strings/string_view.h" + +class Cord; + +namespace absl { +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.begin(), s.size()); +} +inline void AbslFormatFlush(std::ostream* out, string_view s) { + out->write(s.begin(), s.size()); +} + +template ::value>::type> +inline void AbslFormatFlush(AbslCord* out, string_view s) { + out->Append(s); +} + +inline void AbslFormatFlush(FILERawSink* sink, string_view v) { + sink->Write(v); +} + +inline void AbslFormatFlush(BufferRawSink* sink, string_view v) { + sink->Write(v); +} + +template +auto InvokeFlush(T* out, string_view s) + -> decltype(str_format_internal::AbslFormatFlush(out, s)) { + str_format_internal::AbslFormatFlush(out, s); +} + +} // namespace str_format_internal +} // namespace absl + +#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_ -- cgit 1.4.1