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//===- 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 {
SmallString<128> Filename;
bool DeleteIt;
public:
FileRemover() : DeleteIt(false) {}
explicit FileRemover(const Twine& filename, bool deleteIt = true)
: DeleteIt(deleteIt) {
filename.toVector(Filename);
}
~FileRemover() {
if (DeleteIt) {
// Ignore problems deleting the file.
sys::fs::remove(Filename);
}
}
/// setFile - Give ownership of the file to the FileRemover so it will
/// be removed when the object is destroyed. If the FileRemover already
/// had ownership of a file, remove it first.
void setFile(const Twine& filename, bool deleteIt = true) {
if (DeleteIt) {
// Ignore problems deleting the file.
sys::fs::remove(Filename);
}
Filename.clear();
filename.toVector(Filename);
DeleteIt = deleteIt;
}
/// releaseFile - Take ownership of the file away from the FileRemover so it
/// will not be removed when the object is destroyed.
void releaseFile() { DeleteIt = false; }
};
/// 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 {
public:
static Expected<FilePermissionsApplier> create(StringRef InputFilename);
/// Apply stored permissions to the \p OutputFilename.
/// Copy LastAccess and ModificationTime if \p CopyDates is true.
/// Overwrite stored permissions if \p OverwritePermissions is specified.
Error
apply(StringRef OutputFilename, bool CopyDates = false,
std::optional<sys::fs::perms> OverwritePermissions = std::nullopt);
private:
FilePermissionsApplier(StringRef InputFilename, sys::fs::file_status Status)
: InputFilename(InputFilename), InputStatus(Status) {}
StringRef InputFilename;
sys::fs::file_status InputStatus;
};
} // End llvm namespace
#endif
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