1/* -*- c++ -*- */ 2/* 3 * Copyright (C) 2010 The Android Open Source Project 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * * Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in 13 * the documentation and/or other materials provided with the 14 * distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 20 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 23 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#ifndef ANDROID_ASTL_SSTREAM__ 31#define ANDROID_ASTL_SSTREAM__ 32 33#include <char_traits.h> 34#include <ios_base.h> 35#include <streambuf> 36#include <string> 37#include <ostream> 38 39namespace std { 40 41// Declare basic_stringbuf which is a buffer implemented using a std::string. 42// Then declare stringstream which implement a stream using basic_stringbuf. 43 44struct basic_stringbuf : public streambuf { 45 public: 46 typedef streambuf::traits_type traits_type; 47 typedef streambuf::char_type char_type; 48 typedef streambuf::int_type int_type; 49 typedef streambuf::pos_type pos_type; 50 typedef streambuf::off_type off_type; 51 52 // Construct an instance, in/out by default. 53 explicit basic_stringbuf(ios_base::openmode mode = 54 ios_base::in | ios_base::out); 55 56 // Construct an instance and copy str into the underlying buffer 57 // and initialize the input and output sequence according to the 58 // flags set in mode. 59 explicit basic_stringbuf(const string& str, 60 ios_base::openmode mode = 61 ios_base::in | ios_base::out); 62 63 virtual ~basic_stringbuf(); 64 65 // @return A copy of the underlying buffer. If the buffer was 66 // creted in input mode, this is equal to the the input 67 // sequence. Otherwise it is equal to the output sequence. 68 // TODO: In the standard a copy is returned instead of const ref - 69 // not sure why. 70 const string& str() const; 71 72 // Clear the current buffer then copy the content of str into 73 // it. Initialize the input/output sequences according to the mode 74 // used. 75 // @param str The string to use as a new sequence. 76 void str(const string & str); 77 78 // @return -1 on output stream otherwise the number char available 79 // for reading. 80 streamsize in_avail(); 81 82 protected: 83 // Override the default impl from ostream to do the work. 84 virtual streamsize xsputn(const char_type* str, streamsize num); 85 86 ios_base::openmode mMode; 87 string mString; 88}; 89 90// In a regular STL this is <char> full specialization. 91typedef basic_stringbuf stringbuf; 92 93 94class stringstream : public ostream { 95 public: 96 explicit stringstream(ios_base::openmode mode = 97 ios_base::in | ios_base::out); 98 99 explicit stringstream(const string& str, 100 ios_base::openmode mode = 101 ios_base::in | ios_base::out); 102 virtual ~stringstream(); 103 104 const string& str() const { return mStringBuf.str(); } 105 void str(const string & str) { mStringBuf.str(str); } 106 107 // TODO: move this to ostream. 108 ostream& put(char c); 109 110 private: 111 basic_stringbuf mStringBuf; 112}; 113 114// In a regular STL stringstream inherits from ostringstream and 115// istringstream. Since we use stringstream everywhere we just declare 116// ostringstream as an alias to pass compilation. 117typedef stringstream ostringstream; 118 119} // namespace std 120 121#endif // ANDROID_ASTL_SSTREAM__ 122