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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CRAZY_LINKER_LINE_READER_H |
| 6 #define CRAZY_LINKER_LINE_READER_H |
| 7 |
| 8 #include <string.h> |
| 9 |
| 10 #include "crazy_linker_system.h" |
| 11 |
| 12 namespace crazy { |
| 13 |
| 14 // A class used to read text files line-by-line. |
| 15 // Usage: |
| 16 // LineReader reader("/path/to/file"); |
| 17 // while (reader.GetNextLine()) { |
| 18 // const char* line = reader.line(); |
| 19 // size_t line_len = reader.length(); |
| 20 // ... line is not necessarily zero-terminated. |
| 21 // } |
| 22 |
| 23 class LineReader { |
| 24 public: |
| 25 LineReader(); |
| 26 explicit LineReader(const char* path); |
| 27 ~LineReader(); |
| 28 |
| 29 // Open a new file for testing. Doesn't fail. If there was an error |
| 30 // opening the file, GetNextLine() will simply return false. |
| 31 void Open(const char* file_path); |
| 32 |
| 33 // Grab next line. Returns true on success, or false otherwise. |
| 34 bool GetNextLine(); |
| 35 |
| 36 // Return the start of the current line, this is _not_ zero-terminated |
| 37 // and always contains a final newline (\n). |
| 38 // Only call this after a successful GetNextLine(). |
| 39 const char* line() const; |
| 40 |
| 41 // Return the line length, this includes the final \n. |
| 42 // Only call this after a successful GetNextLine(). |
| 43 size_t length() const; |
| 44 |
| 45 private: |
| 46 void Reset(); |
| 47 |
| 48 FileDescriptor fd_; |
| 49 bool eof_; |
| 50 size_t line_start_; |
| 51 size_t line_len_; |
| 52 size_t buff_size_; |
| 53 size_t buff_capacity_; |
| 54 char* buff_; |
| 55 char buff0_[128]; |
| 56 }; |
| 57 |
| 58 } // namespace crazy |
| 59 |
| 60 #endif // CRAZY_LINKER_LINE_READER_H |
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