1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <streambuf> 30 #include <algorithm> // for min 31 namespace std { 32 33 // Implementation of the streambuf, common stuff for all the stream buffers. 34 streambuf::streambuf() 35 : mPutBeg(0), mPutCurr(0), mPutEnd(0) { } 36 37 streambuf::streambuf(const streambuf& sb) 38 : mPutBeg(sb.mPutBeg), mPutCurr(sb.mPutCurr), mPutEnd(sb.mPutEnd) { } 39 40 streambuf::~streambuf() {} 41 42 streamsize streambuf::xsputn(const char_type* str, streamsize num) { 43 streamsize written = 0; 44 45 while (written < num) { 46 const streamsize avail = this->epptr() - this->pptr(); 47 if (avail) { 48 const streamsize remaining = num - written; 49 const streamsize len = std::min(avail, remaining); 50 traits_type::copy(this->pptr(), str, len); 51 written += len; 52 str += len; 53 this->pbump(len); 54 } 55 56 if (written < num) { 57 // Indicate to the impl that we overflown. Either the impl 58 // can increase its buffer and consume one character (in 59 // which case eof() is not returned) or it can't and we 60 // stop here. 61 int_type c = this->overflow(traits_type::to_int_type(*str)); 62 if (!traits_type::eq_int_type(c, traits_type::eof())) { 63 ++written; 64 ++str; 65 } else { 66 break; 67 } 68 } 69 } 70 return written; 71 } 72 73 } // namespace std 74
