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 <ios_base.h> 30 #include <cstdio> 31 #include <new> // for placement new. 32 #include <iostream> // For cout, cerr 33 #include <ostream> 34 #include <stdio_filebuf.h> 35 #include <streambuf> 36 37 // Defined in bionic/libstdc++/src/one_time_construction.cpp 38 extern "C" int __cxa_guard_acquire(int volatile * gv); 39 extern "C" void __cxa_guard_release(int volatile * gv); 40 41 namespace std { 42 int ios_base::Init::sGuard = 0; 43 bool ios_base::Init::sDone = false; 44 45 // Implementation of the ios_base, common stuff for all the streams. 46 47 ios_base::ios_base() 48 : mFlags(skipws | dec), mPrecision(6), mWidth(0) {} 49 50 ios_base::~ios_base() {} 51 52 ios_base::fmtflags ios_base::flags(fmtflags flags) { 53 fmtflags prev = mFlags; 54 mFlags = flags; 55 return prev; 56 } 57 58 ios_base::fmtflags ios_base::setf(fmtflags flags) { 59 fmtflags prev = mFlags; 60 mFlags = flags; 61 return prev; 62 } 63 64 ios_base::fmtflags ios_base::setf(fmtflags flags, fmtflags mask) { 65 fmtflags prev = mFlags; 66 mFlags &= ~mask; 67 mFlags |= (flags & mask); 68 return prev; 69 } 70 71 void ios_base::unsetf(fmtflags mask) { 72 mFlags &= ~mask; 73 } 74 75 streamsize ios_base::precision(streamsize precision) { 76 const streamsize prev = mPrecision; 77 if (precision >= 0) { // Not sure what a negative precision would mean. 78 mPrecision = precision; 79 } 80 return prev; 81 } 82 83 streamsize ios_base::width(streamsize width) { 84 const streamsize prev = mWidth; 85 if (width >= 0) { // Not sure what a negative width would mean. 86 mWidth = width; 87 } 88 return prev; 89 } 90 91 // TODO: This is a temporary class used to illustrate how the 92 // construction will happen. 93 94 class std_filebuf: public streambuf { 95 public: 96 std_filebuf() {} 97 virtual ~std_filebuf() {} 98 }; 99 100 // Storage is declared in src/ios_globals.cpp 101 extern android::stdio_filebuf stdio_filebuf_cout; 102 extern android::stdio_filebuf stdio_filebuf_cerr; 103 104 ios_base::Init::Init() { 105 if (__cxa_guard_acquire(&sGuard) == 1) { 106 if (!sDone) { 107 // Create the global cout and cerr 108 // structures. stdio_filebuf_cout/stdio_filebuf_cerr and 109 // cout/cerr storage are in ios_globals.cpp. 110 new (&stdio_filebuf_cout) android::stdio_filebuf(stdout); 111 new (&stdio_filebuf_cerr) android::stdio_filebuf(stderr); 112 new (&cout) ostream(&stdio_filebuf_cout); 113 new (&cerr) ostream(&stdio_filebuf_cerr); 114 sDone = true; 115 } 116 __cxa_guard_release(&sGuard); 117 } 118 } 119 120 ios_base::Init::~Init() { 121 cout.flush(); 122 cerr.flush(); 123 } 124 125 } // namespace std 126