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|
//===- llvm/System/Unix/Path.cpp - Unix Path Implementation -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Unix specific portion of the Path class.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic UNIX code that
//=== is guaranteed to work on *all* UNIX variants.
//===----------------------------------------------------------------------===//
#include <llvm/Config/config.h>
#include <llvm/Config/alloca.h>
#include "Unix.h"
#include <sys/stat.h>
#include <fcntl.h>
#include <utime.h>
#include <dirent.h>
namespace llvm {
using namespace sys;
Path::Path(std::string unverified_path)
: path(unverified_path)
{
if (unverified_path.empty())
return;
if (this->isValid())
return;
// oops, not valid.
path.clear();
ThrowErrno(unverified_path + ": path is not valid");
}
Path
Path::GetRootDirectory() {
Path result;
result.setDirectory("/");
return result;
}
static inline bool IsLibrary(Path& path, const std::string& basename) {
if (path.appendFile(std::string("lib") + basename)) {
if (path.appendSuffix(Path::GetDLLSuffix()) && path.readable())
return true;
else if (path.elideSuffix() && path.appendSuffix("a") && path.readable())
return true;
else if (path.elideSuffix() && path.appendSuffix("o") && path.readable())
return true;
else if (path.elideSuffix() && path.appendSuffix("bc") && path.readable())
return true;
} else if (path.elideFile() && path.appendFile(basename)) {
if (path.appendSuffix(Path::GetDLLSuffix()) && path.readable())
return true;
else if (path.elideSuffix() && path.appendSuffix("a") && path.readable())
return true;
else if (path.elideSuffix() && path.appendSuffix("o") && path.readable())
return true;
else if (path.elideSuffix() && path.appendSuffix("bc") && path.readable())
return true;
}
path.clear();
return false;
}
Path
Path::GetLibraryPath(const std::string& basename,
const std::vector<std::string>& LibPaths) {
Path result;
// Try the paths provided
for (std::vector<std::string>::const_iterator I = LibPaths.begin(),
E = LibPaths.end(); I != E; ++I ) {
if (result.setDirectory(*I) && IsLibrary(result,basename))
return result;
}
// Try the LLVM lib directory in the LLVM install area
if (result.setDirectory(LLVM_LIBDIR) && IsLibrary(result,basename))
return result;
// Try /usr/lib
if (result.setDirectory("/usr/lib/") && IsLibrary(result,basename))
return result;
// Try /lib
if (result.setDirectory("/lib/") && IsLibrary(result,basename))
return result;
// Can't find it, give up and return invalid path.
result.clear();
return result;
}
Path
Path::GetSystemLibraryPath1() {
return Path("/lib/");
}
Path
Path::GetSystemLibraryPath2() {
return Path("/usr/lib/");
}
Path
Path::GetLLVMDefaultConfigDir() {
return Path("/etc/llvm/");
}
Path
Path::GetLLVMConfigDir() {
Path result;
if (result.setDirectory(LLVM_ETCDIR))
return result;
return GetLLVMDefaultConfigDir();
}
Path
Path::GetUserHomeDirectory() {
const char* home = getenv("HOME");
if (home) {
Path result;
if (result.setDirectory(home))
return result;
}
return GetRootDirectory();
}
bool
Path::isFile() const {
return (isValid() && path[path.length()-1] != '/');
}
bool
Path::isDirectory() const {
return (isValid() && path[path.length()-1] == '/');
}
std::string
Path::getBasename() const {
// Find the last slash
size_t slash = path.rfind('/');
if (slash == std::string::npos)
slash = 0;
else
slash++;
return path.substr(slash, path.rfind('.'));
}
bool Path::hasMagicNumber(const std::string &Magic) const {
size_t len = Magic.size();
assert(len < 1024 && "Request for magic string too long");
char* buf = (char*) alloca(1 + len);
int fd = ::open(path.c_str(),O_RDONLY);
if (fd < 0)
return false;
if (0 != ::read(fd, buf, len))
return false;
close(fd);
buf[len] = '\0';
return Magic == buf;
}
bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
if (!isFile())
return false;
assert(len < 1024 && "Request for magic string too long");
char* buf = (char*) alloca(1 + len);
int fd = ::open(path.c_str(),O_RDONLY);
if (fd < 0)
return false;
ssize_t bytes_read = ::read(fd, buf, len);
::close(fd);
if (ssize_t(len) != bytes_read) {
Magic.clear();
return false;
}
Magic.assign(buf,len);
return true;
}
bool
Path::isBytecodeFile() const {
char buffer[ 4];
buffer[0] = 0;
int fd = ::open(path.c_str(),O_RDONLY);
if (fd < 0)
return false;
ssize_t bytes_read = ::read(fd, buffer, 4);
::close(fd);
if (4 != bytes_read)
return false;
return (buffer[0] == 'l' && buffer[1] == 'l' && buffer[2] == 'v' &&
(buffer[3] == 'c' || buffer[3] == 'm'));
}
bool
Path::isArchive() const {
if (readable()) {
return hasMagicNumber("!<arch>\012");
}
return false;
}
bool
Path::exists() const {
return 0 == access(path.c_str(), F_OK );
}
bool
Path::readable() const {
return 0 == access(path.c_str(), F_OK | R_OK );
}
bool
Path::writable() const {
return 0 == access(path.c_str(), F_OK | W_OK );
}
bool
Path::executable() const {
return 0 == access(path.c_str(), R_OK | X_OK );
}
std::string
Path::getLast() const {
// Find the last slash
size_t pos = path.rfind('/');
// Handle the corner cases
if (pos == std::string::npos)
return path;
// If the last character is a slash
if (pos == path.length()-1) {
// Find the second to last slash
size_t pos2 = path.rfind('/', pos-1);
if (pos2 == std::string::npos)
return path.substr(0,pos);
else
return path.substr(pos2+1,pos-pos2-1);
}
// Return everything after the last slash
return path.substr(pos+1);
}
void
Path::getStatusInfo(StatusInfo& info) const {
struct stat buf;
if (0 != stat(path.c_str(), &buf)) {
ThrowErrno(std::string("Can't get status: ")+path);
}
info.fileSize = buf.st_size;
info.modTime.fromEpochTime(buf.st_mtime);
info.mode = buf.st_mode;
info.user = buf.st_uid;
info.group = buf.st_gid;
info.isDir = S_ISDIR(buf.st_mode);
if (info.isDir && path[path.length()-1] != '/')
path += '/';
}
bool
Path::getDirectoryContents(std::set<Path>& result) const {
if (!isDirectory())
return false;
DIR* direntries = ::opendir(path.c_str());
if (direntries == 0)
ThrowErrno(path + ": can't open directory");
result.clear();
struct dirent* de = ::readdir(direntries);
while (de != 0) {
if (de->d_name[0] != '.') {
Path aPath(path + (const char*)de->d_name);
struct stat buf;
if (0 != stat(aPath.path.c_str(), &buf))
ThrowErrno(aPath.path + ": can't get status");
if (S_ISDIR(buf.st_mode))
aPath.path += "/";
result.insert(aPath);
}
de = ::readdir(direntries);
}
closedir(direntries);
return true;
}
bool
Path::setDirectory(const std::string& a_path) {
if (a_path.size() == 0)
return false;
Path save(*this);
path = a_path;
size_t last = a_path.size() -1;
if (last != 0 && a_path[last] != '/')
path += '/';
if (!isValid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::setFile(const std::string& a_path) {
if (a_path.size() == 0)
return false;
Path save(*this);
path = a_path;
size_t last = a_path.size() - 1;
while (last > 0 && a_path[last] == '/')
last--;
path.erase(last+1);
if (!isValid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::appendDirectory(const std::string& dir) {
if (isFile())
return false;
Path save(*this);
path += dir;
path += "/";
if (!isValid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::elideDirectory() {
if (isFile())
return false;
size_t slashpos = path.rfind('/',path.size());
if (slashpos == 0 || slashpos == std::string::npos)
return false;
if (slashpos == path.size() - 1)
slashpos = path.rfind('/',slashpos-1);
if (slashpos == std::string::npos)
return false;
path.erase(slashpos);
return true;
}
bool
Path::appendFile(const std::string& file) {
if (!isDirectory())
return false;
Path save(*this);
path += file;
if (!isValid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::elideFile() {
if (isDirectory())
return false;
size_t slashpos = path.rfind('/',path.size());
if (slashpos == std::string::npos)
return false;
path.erase(slashpos+1);
return true;
}
bool
Path::appendSuffix(const std::string& suffix) {
if (isDirectory())
return false;
Path save(*this);
path.append(".");
path.append(suffix);
if (!isValid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::elideSuffix() {
if (isDirectory()) return false;
size_t dotpos = path.rfind('.',path.size());
size_t slashpos = path.rfind('/',path.size());
if (slashpos != std::string::npos && dotpos != std::string::npos &&
dotpos > slashpos) {
path.erase(dotpos, path.size()-dotpos);
return true;
}
return false;
}
bool
Path::createDirectory( bool create_parents) {
// Make sure we're dealing with a directory
if (!isDirectory()) return false;
// Get a writeable copy of the path name
char pathname[MAXPATHLEN];
path.copy(pathname,MAXPATHLEN);
// Null-terminate the last component
int lastchar = path.length() - 1 ;
if (pathname[lastchar] == '/')
pathname[lastchar] = 0;
else
pathname[lastchar+1] = 0;
// If we're supposed to create intermediate directories
if ( create_parents ) {
// Find the end of the initial name component
char * next = strchr(pathname,'/');
if ( pathname[0] == '/')
next = strchr(&pathname[1],'/');
// Loop through the directory components until we're done
while ( next != 0 ) {
*next = 0;
if (0 != access(pathname, F_OK | R_OK | W_OK))
if (0 != mkdir(pathname, S_IRWXU | S_IRWXG))
ThrowErrno(std::string(pathname) + ": Can't create directory");
char* save = next;
next = strchr(next+1,'/');
*save = '/';
}
}
if (0 != access(pathname, F_OK | R_OK))
if (0 != mkdir(pathname, S_IRWXU | S_IRWXG))
ThrowErrno(std::string(pathname) + ": Can't create directory");
return true;
}
bool
Path::createFile() {
// Make sure we're dealing with a file
if (!isFile()) return false;
// Create the file
int fd = ::creat(path.c_str(), S_IRUSR | S_IWUSR);
if (fd < 0)
ThrowErrno(path + ": Can't create file");
::close(fd);
return true;
}
bool
Path::createTemporaryFile() {
// Make sure we're dealing with a file
if (!isFile()) return false;
// Append the filename filler
char pathname[MAXPATHLEN];
path.copy(pathname,MAXPATHLEN);
pathname[path.length()] = 0;
strcat(pathname,"XXXXXX");
int fd = ::mkstemp(pathname);
if (fd < 0) {
ThrowErrno(path + ": Can't create temporary file");
}
path = pathname;
::close(fd);
return true;
}
bool
Path::destroyDirectory(bool remove_contents) {
// Make sure we're dealing with a directory
if (!isDirectory()) return false;
// If it doesn't exist, we're done.
if (!exists()) return true;
if (remove_contents) {
// Recursively descend the directory to remove its content
std::string cmd("/bin/rm -rf ");
cmd += path;
system(cmd.c_str());
} else {
// Otherwise, try to just remove the one directory
char pathname[MAXPATHLEN];
path.copy(pathname,MAXPATHLEN);
int lastchar = path.length() - 1 ;
if (pathname[lastchar] == '/')
pathname[lastchar] = 0;
else
pathname[lastchar+1] = 0;
if ( 0 != rmdir(pathname))
ThrowErrno(std::string(pathname) + ": Can't destroy directory");
}
return true;
}
bool
Path::destroyFile() {
if (!isFile()) return false;
if (0 != unlink(path.c_str()))
ThrowErrno(path + ": Can't destroy file");
return true;
}
bool
Path::renameFile(const Path& newName) {
if (!isFile()) return false;
if (0 != rename(path.c_str(), newName.c_str()))
ThrowErrno(std::string("can't rename ") + path + " as " +
newName.toString());
return true;
}
bool
Path::setStatusInfo(const StatusInfo& si) const {
if (!isFile()) return false;
struct utimbuf utb;
utb.actime = si.modTime.toPosixTime();
utb.modtime = utb.actime;
if (0 != ::utime(path.c_str(),&utb))
ThrowErrno(path + ": can't set file modification time");
if (0 != ::chmod(path.c_str(),si.mode))
ThrowErrno(path + ": can't set mode");
return true;
}
}
// vim: sw=2
|