llvm/llvm/include/llvm/Support/FileUtilities.h

//===- llvm/Support/FileUtilities.h - File System Utilities -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines a family of utility functions which are useful for doing
// various things with files.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_FILEUTILITIES_H
#define LLVM_SUPPORT_FILEUTILITIES_H

#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"

#include <system_error>

namespace llvm {

  /// DiffFilesWithTolerance - Compare the two files specified, returning 0 if
  /// the files match, 1 if they are different, and 2 if there is a file error.
  /// This function allows you to specify an absolute and relative FP error that
  /// is allowed to exist.  If you specify a string to fill in for the error
  /// option, it will set the string to an error message if an error occurs, or
  /// if the files are different.
  ///
  int DiffFilesWithTolerance(StringRef FileA,
                             StringRef FileB,
                             double AbsTol, double RelTol,
                             std::string *Error = nullptr);


  /// FileRemover - This class is a simple object meant to be stack allocated.
  /// If an exception is thrown from a region, the object removes the filename
  /// specified (if deleteIt is true).
  ///
  class FileRemover { … };

  /// FilePermssionsApplier helps to copy permissions from an input file to
  /// an output one. It memorizes the status of the input file and can apply
  /// permissions and dates to the output file.
  class FilePermissionsApplier { … };
} // End llvm namespace

#endif