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.
streambuf()34 streambuf::streambuf()
35 : mPutBeg(0), mPutCurr(0), mPutEnd(0) { }
36
streambuf(const streambuf & sb)37 streambuf::streambuf(const streambuf& sb)
38 : mPutBeg(sb.mPutBeg), mPutCurr(sb.mPutCurr), mPutEnd(sb.mPutEnd) { }
39
~streambuf()40 streambuf::~streambuf() {}
41
xsputn(const char_type * str,streamsize num)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