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//===- Support/FileUtilities.cpp - File System Utilities ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a family of utility functions which are useful for doing
// various things with files.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/System/Path.h"
#include "llvm/Config/unistd.h"
#include "llvm/Config/fcntl.h"
#include "llvm/Config/sys/types.h"
#include "llvm/Config/sys/stat.h"
#include "llvm/Config/sys/mman.h"
#include "llvm/Config/alloca.h"
#include <cerrno>
#include <cstdio>
#include <fstream>
#include <iostream>
using namespace llvm;
/// DiffFiles - Compare the two files specified, returning true if they are
/// different or if there is a file error. 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.
///
bool llvm::DiffFiles(const std::string &FileA, const std::string &FileB,
std::string *Error) {
std::ifstream FileAStream(FileA.c_str());
if (!FileAStream) {
if (Error) *Error = "Couldn't open file '" + FileA + "'";
return true;
}
std::ifstream FileBStream(FileB.c_str());
if (!FileBStream) {
if (Error) *Error = "Couldn't open file '" + FileB + "'";
return true;
}
// Compare the two files...
int C1, C2;
do {
C1 = FileAStream.get();
C2 = FileBStream.get();
if (C1 != C2) return true;
} while (C1 != EOF);
return false;
}
/// CopyFile - Copy the specified source file to the specified destination,
/// overwriting destination if it exists. This returns true on failure.
///
bool llvm::CopyFile(const std::string &Dest, const std::string &Src) {
FDHandle InFD(open(Src.c_str(), O_RDONLY));
if (InFD == -1) return true;
FileRemover FR(Dest);
FDHandle OutFD(open(Dest.c_str(), O_WRONLY|O_CREAT, 0666));
if (OutFD == -1) return true;
char Buffer[16*1024];
while (ssize_t Amt = read(InFD, Buffer, 16*1024)) {
if (Amt == -1) {
if (errno != EINTR) return true; // Error reading the file.
} else {
char *BufPtr = Buffer;
while (Amt) {
ssize_t AmtWritten = write(OutFD, BufPtr, Amt);
if (AmtWritten == -1) {
if (errno != EINTR) return true; // Error writing the file.
} else {
Amt -= AmtWritten;
BufPtr += AmtWritten;
}
}
}
}
FR.releaseFile(); // Success!
return false;
}
/// MoveFileOverIfUpdated - If the file specified by New is different than Old,
/// or if Old does not exist, move the New file over the Old file. Otherwise,
/// remove the New file.
///
void llvm::MoveFileOverIfUpdated(const std::string &New,
const std::string &Old) {
if (DiffFiles(New, Old)) {
if (std::rename(New.c_str(), Old.c_str()))
std::cerr << "Error renaming '" << New << "' to '" << Old << "'!\n";
} else {
std::remove(New.c_str());
}
}
/// removeFile - Delete the specified file
///
void llvm::removeFile(const std::string &Filename) {
std::remove(Filename.c_str());
}
/// getUniqueFilename - Return a filename with the specified prefix. If the
/// file does not exist yet, return it, otherwise add a suffix to make it
/// unique.
///
std::string llvm::getUniqueFilename(const std::string &FilenameBase) {
if (!std::ifstream(FilenameBase.c_str()))
return FilenameBase; // Couldn't open the file? Use it!
// Create a pattern for mkstemp...
char *FNBuffer = new char[FilenameBase.size()+8];
strcpy(FNBuffer, FilenameBase.c_str());
strcpy(FNBuffer+FilenameBase.size(), "-XXXXXX");
// Agree on a temporary file name to use....
#if defined(HAVE_MKSTEMP) && !defined(_MSC_VER)
int TempFD;
if ((TempFD = mkstemp(FNBuffer)) == -1) {
// FIXME: this should return an emtpy string or something and allow the
// caller to deal with the error!
std::cerr << "bugpoint: ERROR: Cannot create temporary file in the current "
<< " directory!\n";
exit(1);
}
// We don't need to hold the temp file descriptor... we will trust that no one
// will overwrite/delete the file while we are working on it...
close(TempFD);
#else
// If we don't have mkstemp, use the old and obsolete mktemp function.
if (mktemp(FNBuffer) == 0) {
// FIXME: this should return an emtpy string or something and allow the
// caller to deal with the error!
std::cerr << "bugpoint: ERROR: Cannot create temporary file in the current "
<< " directory!\n";
exit(1);
}
#endif
std::string Result(FNBuffer);
delete[] FNBuffer;
return Result;
}
static bool AddPermissionsBits (const std::string &Filename, int bits) {
// Get the umask value from the operating system. We want to use it
// when changing the file's permissions. Since calling umask() sets
// the umask and returns its old value, we must call it a second
// time to reset it to the user's preference.
int mask = umask(0777); // The arg. to umask is arbitrary.
umask(mask); // Restore the umask.
// Get the file's current mode.
struct stat st;
if ((stat(Filename.c_str(), &st)) == -1)
return false;
// Change the file to have whichever permissions bits from 'bits'
// that the umask would not disable.
if ((chmod(Filename.c_str(), (st.st_mode | (bits & ~mask)))) == -1)
return false;
return true;
}
/// MakeFileExecutable - Make the file named Filename executable by
/// setting whichever execute permissions bits the process's current
/// umask would allow. Filename must name an existing file or
/// directory. Returns true on success, false on error.
///
bool llvm::MakeFileExecutable(const std::string &Filename) {
return AddPermissionsBits(Filename, 0111);
}
/// MakeFileReadable - Make the file named Filename readable by
/// setting whichever read permissions bits the process's current
/// umask would allow. Filename must name an existing file or
/// directory. Returns true on success, false on error.
///
bool llvm::MakeFileReadable(const std::string &Filename) {
return AddPermissionsBits(Filename, 0444);
}
//===----------------------------------------------------------------------===//
// FDHandle class implementation
//
FDHandle::~FDHandle() throw() {
if (FD != -1) close(FD);
}
FDHandle &FDHandle::operator=(int fd) throw() {
if (FD != -1) close(FD);
FD = fd;
return *this;
}
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