1 | // |
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2 | // FileStream_POSIX.cpp |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/src/FileStream_POSIX.cpp#2 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Streams |
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8 | // Module: FileStream |
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9 | // |
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10 | // Copyright (c) 2007, Applied Informatics Software Engineering GmbH. |
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11 | // and Contributors. |
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12 | // |
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13 | // Permission is hereby granted, free of charge, to any person or organization |
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14 | // obtaining a copy of the software and accompanying documentation covered by |
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15 | // this license (the "Software") to use, reproduce, display, distribute, |
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16 | // execute, and transmit the Software, and to prepare derivative works of the |
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17 | // Software, and to permit third-parties to whom the Software is furnished to |
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18 | // do so, all subject to the following: |
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19 | // |
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20 | // The copyright notices in the Software and this entire statement, including |
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21 | // the above license grant, this restriction and the following disclaimer, |
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22 | // must be included in all copies of the Software, in whole or in part, and |
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23 | // all derivative works of the Software, unless such copies or derivative |
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24 | // works are solely in the form of machine-executable object code generated by |
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25 | // a source language processor. |
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26 | // |
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27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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33 | // DEALINGS IN THE SOFTWARE. |
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34 | // |
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35 | |
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36 | |
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37 | #include "Poco/FileStream.h" |
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38 | #include "Poco/File.h" |
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39 | #include "Poco/Exception.h" |
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40 | #include <sys/types.h> |
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41 | #include <sys/stat.h> |
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42 | #include <fcntl.h> |
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43 | #include <unistd.h> |
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44 | |
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45 | |
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46 | namespace Poco { |
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47 | |
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48 | |
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49 | FileStreamBuf::FileStreamBuf(): |
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50 | BufferedBidirectionalStreamBuf(BUFFER_SIZE, std::ios::in | std::ios::out), |
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51 | _fd(-1), |
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52 | _pos(0) |
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53 | { |
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54 | } |
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55 | |
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56 | |
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57 | FileStreamBuf::~FileStreamBuf() |
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58 | { |
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59 | close(); |
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60 | } |
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61 | |
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62 | |
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63 | void FileStreamBuf::open(const std::string& path, std::ios::openmode mode) |
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64 | { |
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65 | poco_assert (_fd == -1); |
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66 | |
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67 | _path = path; |
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68 | setMode(mode); |
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69 | |
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70 | int flags(0); |
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71 | if (mode & std::ios::trunc) |
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72 | flags |= O_TRUNC; |
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73 | if (mode & std::ios::app) |
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74 | flags |= O_APPEND; |
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75 | if (mode & std::ios::out) |
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76 | flags |= O_CREAT; |
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77 | if ((mode & std::ios::in) && (mode & std::ios::out)) |
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78 | flags |= O_RDWR; |
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79 | else if (mode & std::ios::in) |
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80 | flags |= O_RDONLY; |
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81 | else |
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82 | flags |= O_WRONLY; |
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83 | |
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84 | _fd = ::open(path.c_str(), flags, S_IRUSR | S_IWUSR | S_IRGRP); |
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85 | if (_fd == -1) |
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86 | File::handleLastError(_path); |
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87 | |
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88 | if ((mode & std::ios::app) || (mode & std::ios::ate)) |
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89 | seekoff(0, std::ios::end, mode); |
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90 | } |
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91 | |
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92 | |
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93 | int FileStreamBuf::readFromDevice(char* buffer, std::streamsize length) |
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94 | { |
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95 | if (_fd == -1) return -1; |
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96 | |
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97 | if (getMode() & std::ios::out) |
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98 | sync(); |
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99 | |
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100 | int n = read(_fd, buffer, length); |
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101 | if (n == -1) |
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102 | File::handleLastError(_path); |
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103 | _pos += n; |
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104 | return n; |
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105 | } |
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106 | |
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107 | |
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108 | int FileStreamBuf::writeToDevice(const char* buffer, std::streamsize length) |
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109 | { |
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110 | if (_fd == -1) return -1; |
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111 | |
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112 | int n = write(_fd, buffer, length); |
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113 | if (n == -1) |
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114 | File::handleLastError(_path); |
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115 | _pos += n; |
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116 | return n; |
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117 | } |
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118 | |
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119 | |
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120 | bool FileStreamBuf::close() |
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121 | { |
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122 | bool success = true; |
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123 | if (_fd != -1) |
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124 | { |
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125 | try |
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126 | { |
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127 | sync(); |
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128 | } |
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129 | catch (...) |
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130 | { |
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131 | success = false; |
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132 | } |
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133 | ::close(_fd); |
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134 | _fd = -1; |
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135 | } |
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136 | return success; |
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137 | } |
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138 | |
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139 | |
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140 | std::streampos FileStreamBuf::seekoff(std::streamoff off, std::ios::seekdir dir, std::ios::openmode mode) |
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141 | { |
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142 | if (_fd == -1 || !(getMode() & mode)) |
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143 | return -1; |
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144 | |
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145 | if (getMode() & std::ios::out) |
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146 | sync(); |
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147 | |
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148 | std::streamoff adj; |
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149 | if (mode & std::ios::in) |
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150 | adj = static_cast<std::streamoff>(egptr() - gptr()); |
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151 | else |
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152 | adj = 0; |
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153 | |
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154 | resetBuffers(); |
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155 | |
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156 | int whence = SEEK_SET; |
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157 | if (dir == std::ios::cur) |
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158 | { |
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159 | whence = SEEK_CUR; |
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160 | off -= adj; |
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161 | } |
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162 | else if (dir == std::ios::end) |
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163 | { |
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164 | whence = SEEK_END; |
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165 | } |
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166 | _pos = lseek(_fd, off, whence); |
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167 | return _pos; |
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168 | } |
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169 | |
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170 | |
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171 | std::streampos FileStreamBuf::seekpos(std::streampos pos, std::ios::openmode mode) |
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172 | { |
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173 | if (_fd == -1 || !(getMode() & mode)) |
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174 | return -1; |
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175 | |
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176 | if (getMode() & std::ios::out) |
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177 | sync(); |
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178 | |
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179 | resetBuffers(); |
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180 | |
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181 | _pos = lseek(_fd, pos, SEEK_SET); |
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182 | return _pos; |
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183 | } |
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184 | |
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185 | |
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186 | } // namespace Poco |
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