1 //===- llvm/Support/FileUtilities.h - File System Utilities -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines a family of utility functions which are useful for doing
11 // various things with files.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_SUPPORT_FILEUTILITIES_H
16 #define LLVM_SUPPORT_FILEUTILITIES_H
22 /// DiffFiles - Compare the two files specified, returning true if they are
23 /// different or if there is a file error. If you specify a string to fill in
24 /// for the error option, it will set the string to an error message if an error
25 /// occurs, allowing the caller to distinguish between a failed diff and a file
28 bool DiffFiles(const std::string &FileA, const std::string &FileB,
29 std::string *Error = 0);
31 /// MoveFileOverIfUpdated - If the file specified by New is different than Old,
32 /// or if Old does not exist, move the New file over the Old file. Otherwise,
33 /// remove the New file.
35 void MoveFileOverIfUpdated(const std::string &New, const std::string &Old);
37 /// removeFile - Delete the specified file.
39 void removeFile(const std::string &Filename);
41 /// FDHandle - Simple handle class to make sure a file descriptor gets closed
42 /// when the object is destroyed. This handle acts similarly to an
43 /// std::auto_ptr, in that the copy constructor and assignment operators
44 /// transfer ownership of the handle. This means that FDHandle's do not have
50 FDHandle() : FD(-1) {}
51 FDHandle(int fd) : FD(fd) {}
52 FDHandle(FDHandle &RHS) : FD(RHS.FD) {
53 RHS.FD = -1; // Transfer ownership
58 /// get - Get the current file descriptor, without releasing ownership of it.
59 int get() const { return FD; }
60 operator int() const { return FD; }
62 FDHandle &operator=(int fd) throw();
64 FDHandle &operator=(FDHandle &RHS) {
66 RHS.FD = -1; // Transfer ownership
70 /// release - Take ownership of the file descriptor away from the FDHandle
71 /// object, so that the file is not closed when the FDHandle is destroyed.
79 /// FileRemover - This class is a simple object meant to be stack allocated.
80 /// If an exception is thrown from a region, the object removes the filename
81 /// specified (if deleteIt is true).
87 FileRemover(const std::string &filename, bool deleteIt = true)
88 : Filename(filename), DeleteIt(deleteIt) {}
91 if (DeleteIt) removeFile(Filename);
94 /// releaseFile - Take ownership of the file away from the FileRemover so it
95 /// will not be removed when the object is destroyed.
96 void releaseFile() { DeleteIt = false; }
98 } // End llvm namespace