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66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
//===- Support/FileUtilities.cpp - File System Utilities ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a family of utility functions which are useful for doing
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// various things with files.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/System/Path.h"
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#include <fstream>
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#include <iostream>
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using namespace llvm;
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/// DiffFiles - Compare the two files specified, returning true if they are
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/// different or if there is a file error. If you specify a string to fill in
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/// for the error option, it will set the string to an error message if an error
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/// occurs, allowing the caller to distinguish between a failed diff and a file
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/// system error.
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///
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bool llvm::DiffFiles(const std::string &FileA, const std::string &FileB,
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std::string *Error) {
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std::ifstream FileAStream(FileA.c_str());
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if (!FileAStream) {
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if (Error) *Error = "Couldn't open file '" + FileA + "'";
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return true;
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}
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std::ifstream FileBStream(FileB.c_str());
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if (!FileBStream) {
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if (Error) *Error = "Couldn't open file '" + FileB + "'";
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return true;
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}
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// Compare the two files...
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int C1, C2;
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do {
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C1 = FileAStream.get();
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C2 = FileBStream.get();
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if (C1 != C2) return true;
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} while (C1 != EOF);
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return false;
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}
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/// MoveFileOverIfUpdated - If the file specified by New is different than Old,
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/// or if Old does not exist, move the New file over the Old file. Otherwise,
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/// remove the New file.
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///
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void llvm::MoveFileOverIfUpdated(const std::string &New,
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const std::string &Old) {
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if (DiffFiles(New, Old)) {
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if (std::rename(New.c_str(), Old.c_str()))
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std::cerr << "Error renaming '" << New << "' to '" << Old << "'!\n";
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} else {
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std::remove(New.c_str());
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}
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}
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