1 | // (C) Copyright Jonathan Turkanis 2003. |
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2 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
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4 | |
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5 | // See http://www.boost.org/libs/iostreams for documentation. |
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6 | |
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7 | // Inspired by fdstream.hpp, (C) Copyright Nicolai M. Josuttis 2001, |
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8 | // available at http://www.josuttis.com/cppcode/fdstream.html. |
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9 | |
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10 | // Define BOOST_IOSTREAMS_SOURCE so that <boost/iostreams/detail/config.hpp> |
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11 | // knows that we are building the library (possibly exporting code), rather |
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12 | // than using it (possibly importing code). |
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13 | #define BOOST_IOSTREAMS_SOURCE |
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14 | |
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15 | #include <boost/config.hpp> // BOOST_JOIN |
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16 | #include <boost/iostreams/detail/error.hpp> |
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17 | #include <boost/iostreams/detail/config/dyn_link.hpp> |
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18 | #include <boost/iostreams/detail/config/windows_posix.hpp> |
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19 | #include <boost/iostreams/detail/ios.hpp> // openmodes, failure. |
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20 | #include <boost/iostreams/device/file_descriptor.hpp> |
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21 | #include <boost/integer_traits.hpp> |
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22 | |
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23 | // OS-specific headers for low-level i/o. |
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24 | |
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25 | #include <cassert> |
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26 | #include <cstdio> // SEEK_SET, etc. |
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27 | #include <errno.h> |
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28 | #include <fcntl.h> // file opening flags. |
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29 | #include <sys/stat.h> // file access permissions. |
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30 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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31 | # include <io.h> // low-level file i/o. |
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32 | # define WINDOWS_LEAN_AND_MEAN |
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33 | # include <windows.h> |
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34 | #else |
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35 | # include <sys/types.h> // mode_t. |
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36 | # include <unistd.h> // low-level file i/o. |
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37 | #endif |
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38 | |
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39 | // Names of runtime library routines vary. |
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40 | #if defined(__BORLANDC__) |
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41 | # define BOOST_RTL(x) BOOST_JOIN(_rtl_, x) |
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42 | #else |
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43 | # if defined(BOOST_IOSTREAMS_WINDOWS) && !defined(__CYGWIN__) |
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44 | # define BOOST_RTL(x) BOOST_JOIN(_, x) |
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45 | # else |
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46 | # define BOOST_RTL(x) ::x |
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47 | # endif |
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48 | #endif |
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49 | |
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50 | namespace boost { namespace iostreams { |
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51 | |
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52 | //------------------Implementation of file_descriptor-------------------------// |
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53 | |
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54 | void file_descriptor::open |
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55 | ( const std::string& path, BOOST_IOS::openmode m, |
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56 | BOOST_IOS::openmode base ) |
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57 | { |
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58 | using namespace std; |
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59 | m |= base; |
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60 | #ifdef BOOST_IOSTREAMS_WINDOWS //---------------------------------------------// |
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61 | DWORD dwDesiredAccess; |
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62 | DWORD dwCreationDisposition; |
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63 | if ( (m & (BOOST_IOS::in | BOOST_IOS::out)) |
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64 | == |
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65 | (BOOST_IOS::in | BOOST_IOS::out) ) |
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66 | { |
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67 | assert(!(m & BOOST_IOS::app)); |
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68 | dwDesiredAccess = GENERIC_READ | GENERIC_WRITE; |
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69 | dwCreationDisposition = |
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70 | (m & BOOST_IOS::trunc) ? |
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71 | OPEN_ALWAYS : |
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72 | OPEN_EXISTING; |
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73 | } else if (m & BOOST_IOS::in) { |
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74 | assert(!(m & (BOOST_IOS::app |BOOST_IOS::trunc))); |
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75 | dwDesiredAccess = GENERIC_READ; |
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76 | dwCreationDisposition = OPEN_EXISTING; |
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77 | } else if (m & BOOST_IOS::out) { |
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78 | dwDesiredAccess = GENERIC_WRITE; |
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79 | dwCreationDisposition = OPEN_ALWAYS; |
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80 | if (m & BOOST_IOS::app) |
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81 | pimpl_->flags_ |= impl::append; |
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82 | } |
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83 | |
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84 | HANDLE handle = |
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85 | ::CreateFileA( path.c_str(), |
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86 | dwDesiredAccess, |
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87 | 0, // dwShareMode |
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88 | NULL, // lpSecurityAttributes |
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89 | dwCreationDisposition, |
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90 | FILE_ATTRIBUTE_NORMAL, |
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91 | NULL ); // hTemplateFile |
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92 | if (handle != INVALID_HANDLE_VALUE) { |
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93 | pimpl_->handle_ = handle; |
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94 | pimpl_->flags_ |= impl::close_on_exit | impl::has_handle; |
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95 | } else { |
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96 | pimpl_->flags_ = 0; |
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97 | throw BOOST_IOSTREAMS_FAILURE("bad open"); |
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98 | } |
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99 | #else // #ifdef BOOST_IOSTREAMS_WINDOWS //------------------------------------// |
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100 | |
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101 | // Calculate oflag argument to open. |
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102 | |
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103 | int oflag = 0; |
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104 | if ( (m & (BOOST_IOS::in | BOOST_IOS::out)) |
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105 | == |
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106 | (BOOST_IOS::in | BOOST_IOS::out) ) |
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107 | { |
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108 | assert(!(m & BOOST_IOS::app)); |
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109 | oflag |= O_RDWR; |
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110 | } else if (m & BOOST_IOS::in) { |
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111 | assert(!(m & (BOOST_IOS::app |BOOST_IOS::trunc))); |
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112 | oflag |= O_RDONLY; |
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113 | } else if (m & BOOST_IOS::out) { |
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114 | oflag |= O_WRONLY; |
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115 | m |= BOOST_IOS::trunc; |
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116 | if (m & BOOST_IOS::app) |
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117 | oflag |= O_APPEND; |
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118 | } |
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119 | if (m & BOOST_IOS::trunc) |
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120 | oflag |= O_CREAT; |
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121 | |
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122 | // Calculate pmode argument to open. |
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123 | |
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124 | mode_t pmode = S_IRUSR | S_IWUSR | |
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125 | S_IRGRP | S_IWGRP | |
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126 | S_IROTH | S_IWOTH; |
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127 | |
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128 | // Open file. |
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129 | |
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130 | int fd = BOOST_RTL(open)(path.c_str(), oflag, pmode); |
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131 | if (fd == -1) { |
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132 | throw BOOST_IOSTREAMS_FAILURE("bad open"); |
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133 | } else { |
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134 | pimpl_->fd_ = fd; |
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135 | pimpl_->flags_ = impl::close_on_exit; |
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136 | } |
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137 | #endif // #ifndef BOOST_IOSTREAMS_WINDOWS //----------------------------------// |
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138 | } |
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139 | |
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140 | std::streamsize file_descriptor::read(char_type* s, std::streamsize n) |
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141 | { |
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142 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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143 | if (pimpl_->flags_ & impl::has_handle) { |
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144 | DWORD result; |
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145 | if (!::ReadFile(pimpl_->handle_, s, n, &result, NULL)) |
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146 | throw detail::bad_read(); |
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147 | return static_cast<std::streamsize>(result); |
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148 | } |
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149 | #endif |
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150 | errno = 0; |
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151 | std::streamsize result = BOOST_RTL(read)(pimpl_->fd_, s, n); |
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152 | if (errno != 0) |
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153 | throw detail::bad_read(); |
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154 | return result == 0 ? -1 : result; |
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155 | } |
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156 | |
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157 | std::streamsize file_descriptor::write(const char_type* s, std::streamsize n) |
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158 | { |
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159 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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160 | if (pimpl_->flags_ & impl::has_handle) { |
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161 | if (pimpl_->flags_ & impl::append) { |
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162 | ::SetFilePointer(pimpl_->handle_, 0, NULL, FILE_END); |
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163 | if (::GetLastError() != NO_ERROR) |
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164 | throw detail::bad_seek(); |
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165 | } |
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166 | DWORD ignore; |
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167 | if (!::WriteFile(pimpl_->handle_, s, n, &ignore, NULL)) |
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168 | throw detail::bad_write(); |
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169 | return n; |
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170 | } |
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171 | #endif |
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172 | int amt = BOOST_RTL(write)(pimpl_->fd_, s, n); |
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173 | if (amt < n) |
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174 | throw detail::bad_write(); // Handles blocking fd's only. |
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175 | return n; |
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176 | } |
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177 | |
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178 | std::streampos file_descriptor::seek |
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179 | (stream_offset off, BOOST_IOS::seekdir way) |
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180 | { |
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181 | using namespace std; |
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182 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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183 | if (pimpl_->flags_ & impl::has_handle) { |
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184 | LONG lDistanceToMove = static_cast<LONG>(off & 0xffffffff); |
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185 | LONG lDistanceToMoveHigh = static_cast<LONG>(off >> 32); |
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186 | DWORD dwResultLow = |
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187 | ::SetFilePointer( pimpl_->handle_, |
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188 | lDistanceToMove, |
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189 | &lDistanceToMoveHigh, |
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190 | way == BOOST_IOS::beg ? |
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191 | FILE_BEGIN : |
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192 | way == BOOST_IOS::cur ? |
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193 | FILE_CURRENT : |
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194 | FILE_END ); |
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195 | if (::GetLastError() != NO_ERROR) { |
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196 | throw detail::bad_seek(); |
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197 | } else { |
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198 | return offset_to_position((lDistanceToMoveHigh << 32) + dwResultLow); |
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199 | } |
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200 | } |
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201 | #endif // #ifdef BOOST_IOSTREAMS_WINDOWS |
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202 | |
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203 | #ifndef BOOST_IOSTREAMS_HAS_LSEEK64 |
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204 | if ( off > integer_traits<long>::const_max || |
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205 | off < integer_traits<long>::const_min ) |
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206 | { |
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207 | throw BOOST_IOSTREAMS_FAILURE("bad offset"); |
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208 | } |
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209 | #endif |
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210 | |
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211 | stream_offset result = |
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212 | #ifdef BOOST_IOSTREAMS_HAS_LSEEK64 |
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213 | lseek64 |
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214 | #else |
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215 | lseek |
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216 | #endif |
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217 | ( pimpl_->fd_, |
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218 | #ifdef BOOST_IOSTREAMS_HAS_LSEEK64 |
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219 | off, |
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220 | #else |
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221 | static_cast<long>(off), |
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222 | #endif |
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223 | way == BOOST_IOS::beg ? |
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224 | SEEK_SET : |
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225 | way == BOOST_IOS::cur ? |
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226 | SEEK_CUR : |
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227 | SEEK_END ); |
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228 | if (result == -1) |
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229 | throw detail::bad_seek(); |
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230 | return offset_to_position(result); |
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231 | } |
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232 | |
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233 | void file_descriptor::close() { close_impl(*pimpl_); } |
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234 | |
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235 | void file_descriptor::close_impl(impl& i) |
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236 | { |
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237 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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238 | if (i.flags_ & impl::has_handle) { |
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239 | if (!::CloseHandle(i.handle_)) |
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240 | throw BOOST_IOSTREAMS_FAILURE("bad close"); |
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241 | i.fd_ = -1; |
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242 | i.flags_ = 0; |
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243 | return; |
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244 | } |
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245 | #endif |
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246 | if (i.fd_ != -1) { |
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247 | if (BOOST_RTL(close)(i.fd_) == -1) |
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248 | throw BOOST_IOSTREAMS_FAILURE("bad close"); |
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249 | i.fd_ = -1; |
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250 | i.flags_ = 0; |
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251 | } |
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252 | } |
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253 | |
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254 | } } // End namespaces iostreams, boost. |
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