1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_INDENTER_H_ 18 #define ART_RUNTIME_INDENTER_H_ 19 20 #include "base/logging.h" 21 #include "base/macros.h" 22 #include <streambuf> 23 24 const char kIndentChar =' '; 25 const size_t kIndentBy1Count = 2; 26 27 class Indenter : public std::streambuf { 28 public: Indenter(std::streambuf * out,char text,size_t count)29 Indenter(std::streambuf* out, char text, size_t count) 30 : indent_next_(true), out_sbuf_(out), text_(text), count_(count) {} 31 32 private: overflow(int_type c)33 int_type overflow(int_type c) { 34 if (UNLIKELY(c == std::char_traits<char>::eof())) { 35 out_sbuf_->pubsync(); 36 return c; 37 } 38 if (indent_next_) { 39 for (size_t i = 0; i < count_; ++i) { 40 int_type r = out_sbuf_->sputc(text_); 41 if (UNLIKELY(r != text_)) { 42 out_sbuf_->pubsync(); 43 r = out_sbuf_->sputc(text_); 44 CHECK_EQ(r, text_) << "Error writing to buffer. Disk full?"; 45 } 46 } 47 } 48 indent_next_ = (c == '\n'); 49 int_type r = out_sbuf_->sputc(c); 50 if (UNLIKELY(r != c)) { 51 out_sbuf_->pubsync(); 52 r = out_sbuf_->sputc(c); 53 CHECK_EQ(r, c) << "Error writing to buffer. Disk full?"; 54 } 55 return r; 56 } 57 sync()58 int sync() { 59 return out_sbuf_->pubsync(); 60 } 61 62 bool indent_next_; 63 64 // Buffer to write output to. 65 std::streambuf* const out_sbuf_; 66 67 // Text output as indent. 68 const char text_; 69 70 // Number of times text is output. 71 const size_t count_; 72 73 DISALLOW_COPY_AND_ASSIGN(Indenter); 74 }; 75 76 #endif // ART_RUNTIME_INDENTER_H_ 77