//===- 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 <fstream>
#include <iostream>
#include <cstdio>
+using namespace llvm;
+
+/// CheckMagic - Returns true IFF the file named FN begins with Magic. FN must
+/// name a readable file.
+///
+bool llvm::CheckMagic(const std::string &FN, const std::string &Magic) {
+ char buf[1 + Magic.size ()];
+ std::ifstream f (FN.c_str ());
+ f.read (buf, Magic.size ());
+ buf[Magic.size ()] = '\0';
+ return Magic == buf;
+}
+
+/// IsArchive - Returns true IFF the file named FN appears to be a "ar" library
+/// archive. The file named FN must exist.
+///
+bool llvm::IsArchive(const std::string &FN) {
+ // Inspect the beginning of the file to see if it contains the "ar"
+ // library archive format magic string.
+ return CheckMagic (FN, "!<arch>\012");
+}
+
+/// IsBytecode - Returns true IFF the file named FN appears to be an LLVM
+/// bytecode file. The file named FN must exist.
+///
+bool llvm::IsBytecode(const std::string &FN) {
+ // Inspect the beginning of the file to see if it contains the LLVM
+ // bytecode format magic string.
+ return CheckMagic (FN, "llvm");
+}
+
+/// IsSharedObject - Returns trus IFF the file named FN appears to be a shared
+/// object with an ELF header. The file named FN must exist.
+///
+bool llvm::IsSharedObject(const std::string &FN) {
+ // Inspect the beginning of the file to see if it contains the ELF shared
+ // object magic string.
+ static const char elfMagic[] = { 0x7f, 'E', 'L', 'F', '\0' };
+ return CheckMagic(FN, elfMagic);
+}
+
+/// FileOpenable - Returns true IFF Filename names an existing regular
+/// file which we can successfully open.
+///
+bool llvm::FileOpenable(const std::string &Filename) {
+ struct stat s;
+ if (stat (Filename.c_str (), &s) == -1)
+ return false; // Cannot stat file
+ if (!S_ISREG (s.st_mode))
+ return false; // File is not a regular file
+ std::ifstream FileStream (Filename.c_str ());
+ if (!FileStream)
+ return false; // File is not openable
+ return true;
+}
/// 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
/// occurs, allowing the caller to distinguish between a failed diff and a file
/// system error.
///
-bool DiffFiles(const std::string &FileA, const std::string &FileB,
- std::string *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 + "'";
/// or if Old does not exist, move the New file over the Old file. Otherwise,
/// remove the New file.
///
-void MoveFileOverIfUpdated(const std::string &New, const std::string &Old) {
+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";
/// removeFile - Delete the specified file
///
-void removeFile(const std::string &Filename) {
+void llvm::removeFile(const std::string &Filename) {
std::remove(Filename.c_str());
}
/// file does not exist yet, return it, otherwise add a suffix to make it
/// unique.
///
-std::string getUniqueFilename(const std::string &FilenameBase) {
+std::string llvm::getUniqueFilename(const std::string &FilenameBase) {
if (!std::ifstream(FilenameBase.c_str()))
return FilenameBase; // Couldn't open the file? Use it!
exit(1);
}
- // We don't need to hold the temp file descriptor... we will trust that noone
+ // 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);
std::string Result(FNBuffer);
return Result;
}
-///
-/// Method: MakeFileExecutable ()
-///
-/// Description:
-/// This method makes the specified filename executable by giving it
-/// execute permission.
-///
-/// For the UNIX version of this method, we turn on all of the read and
-/// execute bits and then turn off anything specified in the umask. This
-/// should help ensure that access to the file remains at the level that
-/// the user desires.
-///
-bool
-MakeFileExecutable (const std::string & Filename)
-{
- // Permissions masking value of the user
- mode_t mask;
-
- // Permissions currently enabled on the file
- struct stat fstat;
-
- //
- // Grab the umask value from the operating system. We want to use it when
- // changing the file's permissions.
- //
- // Note:
- // Umask() is one of those annoying system calls. You have to call it
- // to get the current value and then set it back.
- //
- mask = umask (0x777);
+static bool AddPermissionsBits (const std::string &Filename, mode_t 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.
+ mode_t mask = umask (0777); // The arg. to umask is arbitrary...
umask (mask);
- //
- // Go fetch the file's current permission bits. We want to *add* execute
- // access to the file.
- //
- if ((stat (Filename.c_str(), &fstat)) == -1)
- {
+ // Get the file's current mode.
+ struct stat st;
+ if ((stat (Filename.c_str(), &st)) == -1)
return false;
- }
- // Make the script executable...
- chmod(Filename.c_str(), (fstat.st_mode | (0111 & ~mask)));
+ // 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);
+}
+
+/// getFileSize - Return the size of the specified file in bytes, or -1 if the
+/// file cannot be read or does not exist.
+long long llvm::getFileSize(const std::string &Filename) {
+ struct stat StatBuf;
+ if (stat(Filename.c_str(), &StatBuf) == -1)
+ return -1;
+ return StatBuf.st_size;
+}
+
+/// getFileTimestamp - Get the last modified time for the specified file in an
+/// unspecified format. This is useful to allow checking to see if a file was
+/// updated since that last time the timestampt was aquired. If the file does
+/// not exist or there is an error getting the time-stamp, zero is returned.
+unsigned long long llvm::getFileTimestamp(const std::string &Filename) {
+ struct stat StatBuf;
+ if (stat(Filename.c_str(), &StatBuf) == -1)
+ return 0;
+ return StatBuf.st_mtime;
+}
+
+
+
+
+//===----------------------------------------------------------------------===//
+// 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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