llvm/llvm/lib/Support/FileUtilities.cpp

//===- Support/FileUtilities.cpp - File System Utilities ------------------===//
//
// 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 implements a family of utility functions which are useful for doing
// various things with files.
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/FileUtilities.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/raw_ostream.h"
#include <cmath>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <memory>
#include <system_error>

usingnamespacellvm;

static bool isSignedChar(char C) { … }

static bool isExponentChar(char C) { … }

static bool isNumberChar(char C) { … }

static const char *BackupNumber(const char *Pos, const char *FirstChar) { … }

/// EndOfNumber - Return the first character that is not part of the specified
/// number.  This assumes that the buffer is null terminated, so it won't fall
/// off the end.
static const char *EndOfNumber(const char *Pos) { … }

/// CompareNumbers - compare two numbers, returning true if they are different.
static bool CompareNumbers(const char *&F1P, const char *&F2P,
                           const char *F1End, const char *F2End,
                           double AbsTolerance, double RelTolerance,
                           std::string *ErrorMsg) { … }

/// 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 differs from DiffFiles in that you can 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, allowing the caller to distinguish between a failed diff and a
/// file system error.
///
int llvm::DiffFilesWithTolerance(StringRef NameA,
                                 StringRef NameB,
                                 double AbsTol, double RelTol,
                                 std::string *Error) { … }

Expected<FilePermissionsApplier>
FilePermissionsApplier::create(StringRef InputFilename) { … }

Error FilePermissionsApplier::apply(
    StringRef OutputFilename, bool CopyDates,
    std::optional<sys::fs::perms> OverwritePermissions) { … }