1 /* 2 * Copyright (c) 2015, Intel Corporation 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, this 9 * list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation and/or 13 * other materials provided with the distribution. 14 * 15 * 3. Neither the name of the copyright holder nor the names of its contributors 16 * may be used to endorse or promote products derived from this software without 17 * specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #pragma once 31 32 #include <exception> 33 #include <fstream> 34 #include <string> 35 #include <array> 36 37 #include <cerrno> 38 #include <cstring> 39 40 namespace parameterFramework 41 { 42 namespace utility 43 { 44 45 /** Create a temporary file with the given content. */ 46 class TmpFile 47 { 48 public: TmpFile(std::string content)49 TmpFile(std::string content) : mPath(mktmp()) 50 { 51 std::ofstream file(mPath); 52 file.exceptions(std::ofstream::failbit | std::ofstream::badbit); 53 file << content; 54 // Close explicitly to detect errors (fstream destructor does not throw) 55 file.close(); 56 } 57 TmpFile(TmpFile && right)58 TmpFile(TmpFile &&right) : mPath(std::move(right.mPath)) { right.mPath.clear(); } 59 60 /** Forbid copy semantic as sharing the tmp file is not needed. 61 * @{ */ 62 TmpFile(const TmpFile &right) = delete; 63 TmpFile &operator=(const TmpFile &right) = delete; 64 /** @} */ 65 operator =(TmpFile && right)66 TmpFile &operator=(TmpFile &&right) 67 { 68 remove(); 69 mPath = std::move(right.mPath); 70 right.mPath.clear(); 71 return *this; 72 } 73 ~TmpFile()74 ~TmpFile() { remove(); } 75 76 /** @return the path to the temporary file. 77 * "" if the file was moved from. 78 */ getPath() const79 const std::string &getPath() const { return mPath; } 80 private: 81 /** @return a valid unique file name. */ 82 std::string mktmp(); 83 84 /** Throw an std::runtime_error with a message constructed from the context and std::errno. 85 * 86 * Call it after a c standard function failure. 87 */ throwErrnoError(std::string context)88 static void throwErrnoError(std::string context) 89 { 90 auto message = context + ": (" + std::to_string(errno) + ") " + std::strerror(errno); 91 throw std::runtime_error(message); 92 } 93 remove()94 void remove() 95 { 96 if (not mPath.empty()) { 97 if (std::remove(mPath.c_str()) != 0) { 98 throwErrnoError("Could not delete tmpfile"); 99 } 100 } 101 } 102 std::string mPath; 103 }; 104 105 } // namespace utility 106 } // namespace parameterFramework 107