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const because they affect the file system, not the Path object. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18973 91177308-0d34-0410-b5e6-96231b3b80d8
642 lines
16 KiB
C++
642 lines
16 KiB
C++
//===- llvm/System/Unix/Path.cpp - Unix Path Implementation -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Unix specific portion of the Path class.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include <llvm/Config/config.h>
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#include <llvm/Config/alloca.h>
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#include "Unix.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <utime.h>
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#include <dirent.h>
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namespace llvm {
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using namespace sys;
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Path::Path(const std::string& unverified_path)
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: path(unverified_path)
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{
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if (unverified_path.empty())
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return;
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if (this->isValid())
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return;
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// oops, not valid.
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path.clear();
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ThrowErrno(unverified_path + ": path is not valid");
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}
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Path
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Path::GetRootDirectory() {
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Path result;
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result.setDirectory("/");
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return result;
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}
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static void getPathList(const char*path, std::vector<sys::Path>& Paths) {
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const char* at = path;
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const char* delim = strchr(at, ':');
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Path tmpPath;
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while( delim != 0 ) {
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std::string tmp(at, size_t(delim-at));
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if (tmpPath.setDirectory(tmp))
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if (tmpPath.readable())
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Paths.push_back(tmpPath);
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at = delim + 1;
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delim = strchr(at, ':');
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}
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if (*at != 0)
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if (tmpPath.setDirectory(std::string(at)))
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if (tmpPath.readable())
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Paths.push_back(tmpPath);
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}
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void
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Path::GetSystemLibraryPaths(std::vector<sys::Path>& Paths) {
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#ifdef LTDL_SHLIBPATH_VAR
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char* env_var = getenv(LTDL_SHLIBPATH_VAR);
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if (env_var != 0) {
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getPathList(env_var,Paths);
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}
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#endif
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// FIXME: Should this look at LD_LIBRARY_PATH too?
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Paths.push_back(sys::Path("/usr/local/lib/"));
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Paths.push_back(sys::Path("/usr/X11R6/lib/"));
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Paths.push_back(sys::Path("/usr/lib/"));
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Paths.push_back(sys::Path("/lib/"));
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}
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void
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Path::GetBytecodeLibraryPaths(std::vector<sys::Path>& Paths) {
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char * env_var = getenv("LLVM_LIB_SEARCH_PATH");
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if (env_var != 0) {
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getPathList(env_var,Paths);
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}
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#ifdef LLVM_LIBDIR
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{
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Path tmpPath;
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if (tmpPath.setDirectory(LLVM_LIBDIR))
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if (tmpPath.readable())
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Paths.push_back(tmpPath);
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}
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#endif
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GetSystemLibraryPaths(Paths);
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}
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Path
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Path::GetLLVMDefaultConfigDir() {
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return Path("/etc/llvm/");
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}
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Path
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Path::GetUserHomeDirectory() {
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const char* home = getenv("HOME");
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if (home) {
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Path result;
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if (result.setDirectory(home))
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return result;
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}
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return GetRootDirectory();
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}
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bool
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Path::isFile() const {
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return (isValid() && path[path.length()-1] != '/');
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}
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bool
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Path::isDirectory() const {
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return (isValid() && path[path.length()-1] == '/');
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}
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std::string
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Path::getBasename() const {
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// Find the last slash
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size_t slash = path.rfind('/');
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if (slash == std::string::npos)
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slash = 0;
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else
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slash++;
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return path.substr(slash, path.rfind('.'));
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}
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bool Path::hasMagicNumber(const std::string &Magic) const {
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size_t len = Magic.size();
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assert(len < 1024 && "Request for magic string too long");
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char* buf = (char*) alloca(1 + len);
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int fd = ::open(path.c_str(),O_RDONLY);
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if (fd < 0)
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return false;
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size_t read_len = ::read(fd, buf, len);
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close(fd);
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if (len != read_len)
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return false;
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buf[len] = '\0';
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return Magic == buf;
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}
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bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
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if (!isFile())
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return false;
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assert(len < 1024 && "Request for magic string too long");
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char* buf = (char*) alloca(1 + len);
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int fd = ::open(path.c_str(),O_RDONLY);
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if (fd < 0)
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return false;
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ssize_t bytes_read = ::read(fd, buf, len);
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::close(fd);
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if (ssize_t(len) != bytes_read) {
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Magic.clear();
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return false;
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}
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Magic.assign(buf,len);
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return true;
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}
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bool
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Path::isBytecodeFile() const {
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char buffer[ 4];
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buffer[0] = 0;
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int fd = ::open(path.c_str(),O_RDONLY);
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if (fd < 0)
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return false;
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ssize_t bytes_read = ::read(fd, buffer, 4);
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::close(fd);
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if (4 != bytes_read)
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return false;
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return (buffer[0] == 'l' && buffer[1] == 'l' && buffer[2] == 'v' &&
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(buffer[3] == 'c' || buffer[3] == 'm'));
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}
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bool
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Path::exists() const {
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return 0 == access(path.c_str(), F_OK );
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}
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bool
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Path::readable() const {
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return 0 == access(path.c_str(), F_OK | R_OK );
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}
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bool
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Path::writable() const {
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return 0 == access(path.c_str(), F_OK | W_OK );
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}
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bool
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Path::executable() const {
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return 0 == access(path.c_str(), R_OK | X_OK );
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}
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std::string
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Path::getLast() const {
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// Find the last slash
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size_t pos = path.rfind('/');
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// Handle the corner cases
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if (pos == std::string::npos)
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return path;
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// If the last character is a slash
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if (pos == path.length()-1) {
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// Find the second to last slash
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size_t pos2 = path.rfind('/', pos-1);
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if (pos2 == std::string::npos)
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return path.substr(0,pos);
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else
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return path.substr(pos2+1,pos-pos2-1);
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}
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// Return everything after the last slash
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return path.substr(pos+1);
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}
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void
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Path::getStatusInfo(StatusInfo& info) const {
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struct stat buf;
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if (0 != stat(path.c_str(), &buf)) {
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ThrowErrno(std::string("Can't get status: ")+path);
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}
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info.fileSize = buf.st_size;
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info.modTime.fromEpochTime(buf.st_mtime);
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info.mode = buf.st_mode;
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info.user = buf.st_uid;
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info.group = buf.st_gid;
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info.isDir = S_ISDIR(buf.st_mode);
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if (info.isDir && path[path.length()-1] != '/')
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path += '/';
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}
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static bool AddPermissionBits(const std::string& Filename, int bits) {
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// Get the umask value from the operating system. We want to use it
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// when changing the file's permissions. Since calling umask() sets
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// the umask and returns its old value, we must call it a second
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// time to reset it to the user's preference.
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int mask = umask(0777); // The arg. to umask is arbitrary.
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umask(mask); // Restore the umask.
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// Get the file's current mode.
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struct stat st;
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if ((stat(Filename.c_str(), &st)) == -1)
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return false;
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// Change the file to have whichever permissions bits from 'bits'
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// that the umask would not disable.
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if ((chmod(Filename.c_str(), (st.st_mode | (bits & ~mask)))) == -1)
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return false;
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return true;
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}
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void Path::makeReadable() {
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if (!AddPermissionBits(path,0444))
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ThrowErrno(path + ": can't make file readable");
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}
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void Path::makeWriteable() {
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if (!AddPermissionBits(path,0222))
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ThrowErrno(path + ": can't make file writable");
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}
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void Path::makeExecutable() {
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if (!AddPermissionBits(path,0111))
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ThrowErrno(path + ": can't make file executable");
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}
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bool
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Path::getDirectoryContents(std::set<Path>& result) const {
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if (!isDirectory())
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return false;
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DIR* direntries = ::opendir(path.c_str());
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if (direntries == 0)
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ThrowErrno(path + ": can't open directory");
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result.clear();
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struct dirent* de = ::readdir(direntries);
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while (de != 0) {
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if (de->d_name[0] != '.') {
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Path aPath(path + (const char*)de->d_name);
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struct stat buf;
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if (0 != stat(aPath.path.c_str(), &buf))
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ThrowErrno(aPath.path + ": can't get status");
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if (S_ISDIR(buf.st_mode))
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aPath.path += "/";
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result.insert(aPath);
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}
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de = ::readdir(direntries);
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}
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closedir(direntries);
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return true;
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}
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bool
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Path::setDirectory(const std::string& a_path) {
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if (a_path.size() == 0)
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return false;
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Path save(*this);
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path = a_path;
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size_t last = a_path.size() -1;
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if (a_path[last] != '/')
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path += '/';
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if (!isValid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::setFile(const std::string& a_path) {
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if (a_path.size() == 0)
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return false;
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Path save(*this);
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path = a_path;
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size_t last = a_path.size() - 1;
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while (last > 0 && a_path[last] == '/')
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last--;
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path.erase(last+1);
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if (!isValid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::appendDirectory(const std::string& dir) {
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if (isFile())
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return false;
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Path save(*this);
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path += dir;
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path += "/";
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if (!isValid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::elideDirectory() {
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if (isFile())
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return false;
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size_t slashpos = path.rfind('/',path.size());
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if (slashpos == 0 || slashpos == std::string::npos)
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return false;
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if (slashpos == path.size() - 1)
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slashpos = path.rfind('/',slashpos-1);
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if (slashpos == std::string::npos)
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return false;
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path.erase(slashpos);
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return true;
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}
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bool
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Path::appendFile(const std::string& file) {
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if (!isDirectory())
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return false;
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Path save(*this);
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path += file;
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if (!isValid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::elideFile() {
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if (isDirectory())
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return false;
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size_t slashpos = path.rfind('/',path.size());
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if (slashpos == std::string::npos)
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return false;
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path.erase(slashpos+1);
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return true;
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}
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bool
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Path::appendSuffix(const std::string& suffix) {
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if (isDirectory())
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return false;
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Path save(*this);
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path.append(".");
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path.append(suffix);
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if (!isValid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::elideSuffix() {
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if (isDirectory()) return false;
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size_t dotpos = path.rfind('.',path.size());
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size_t slashpos = path.rfind('/',path.size());
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if (slashpos != std::string::npos && dotpos != std::string::npos &&
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dotpos > slashpos) {
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path.erase(dotpos, path.size()-dotpos);
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return true;
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}
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return false;
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}
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bool
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Path::createDirectory( bool create_parents) {
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// Make sure we're dealing with a directory
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if (!isDirectory()) return false;
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// Get a writeable copy of the path name
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char pathname[MAXPATHLEN];
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path.copy(pathname,MAXPATHLEN);
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// Null-terminate the last component
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int lastchar = path.length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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else
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pathname[lastchar+1] = 0;
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// If we're supposed to create intermediate directories
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if ( create_parents ) {
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// Find the end of the initial name component
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char * next = strchr(pathname,'/');
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if ( pathname[0] == '/')
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next = strchr(&pathname[1],'/');
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// Loop through the directory components until we're done
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while ( next != 0 ) {
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*next = 0;
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if (0 != access(pathname, F_OK | R_OK | W_OK))
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if (0 != mkdir(pathname, S_IRWXU | S_IRWXG))
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ThrowErrno(std::string(pathname) + ": Can't create directory");
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char* save = next;
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next = strchr(next+1,'/');
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*save = '/';
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}
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}
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if (0 != access(pathname, F_OK | R_OK))
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if (0 != mkdir(pathname, S_IRWXU | S_IRWXG))
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ThrowErrno(std::string(pathname) + ": Can't create directory");
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return true;
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}
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bool
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Path::createFile() {
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// Make sure we're dealing with a file
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if (!isFile()) return false;
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// Create the file
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int fd = ::creat(path.c_str(), S_IRUSR | S_IWUSR);
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if (fd < 0)
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ThrowErrno(path + ": Can't create file");
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::close(fd);
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return true;
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}
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bool
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Path::createTemporaryFile(bool reuse_current) {
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// Make sure we're dealing with a file
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if (!isFile())
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return false;
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// Make this into a unique file name
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makeUnique( reuse_current );
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// create the file
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int outFile = ::open(path.c_str(), O_WRONLY|O_CREAT|O_TRUNC, 0666);
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if (outFile != -1) {
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::close(outFile);
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return true;
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}
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return false;
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}
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bool
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Path::destroyDirectory(bool remove_contents) const {
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// Make sure we're dealing with a directory
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if (!isDirectory()) return false;
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// If it doesn't exist, we're done.
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if (!exists()) return true;
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if (remove_contents) {
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// Recursively descend the directory to remove its content
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std::string cmd("/bin/rm -rf ");
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cmd += path;
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system(cmd.c_str());
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} else {
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// Otherwise, try to just remove the one directory
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char pathname[MAXPATHLEN];
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path.copy(pathname,MAXPATHLEN);
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int lastchar = path.length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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else
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pathname[lastchar+1] = 0;
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if ( 0 != rmdir(pathname))
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ThrowErrno(std::string(pathname) + ": Can't destroy directory");
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}
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return true;
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}
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bool
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Path::destroyFile() const {
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if (!isFile()) return false;
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if (0 != unlink(path.c_str()))
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ThrowErrno(path + ": Can't destroy file");
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return true;
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}
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bool
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Path::renameFile(const Path& newName) {
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if (!isFile()) return false;
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if (0 != rename(path.c_str(), newName.c_str()))
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ThrowErrno(std::string("can't rename ") + path + " as " +
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newName.toString());
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return true;
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}
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bool
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Path::setStatusInfo(const StatusInfo& si) const {
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if (!isFile()) return false;
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struct utimbuf utb;
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utb.actime = si.modTime.toPosixTime();
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utb.modtime = utb.actime;
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if (0 != ::utime(path.c_str(),&utb))
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ThrowErrno(path + ": can't set file modification time");
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if (0 != ::chmod(path.c_str(),si.mode))
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ThrowErrno(path + ": can't set mode");
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return true;
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}
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void
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CopyFile(const sys::Path &Dest, const sys::Path &Src) {
|
|
int inFile = -1;
|
|
int outFile = -1;
|
|
try {
|
|
inFile = ::open(Src.c_str(), O_RDONLY);
|
|
if (inFile == -1)
|
|
ThrowErrno("Cannnot open source file to copy: " + Src.toString());
|
|
|
|
outFile = ::open(Dest.c_str(), O_WRONLY|O_CREAT, 0666);
|
|
if (outFile == -1)
|
|
ThrowErrno("Cannnot create destination file for copy: " +Dest.toString());
|
|
|
|
char Buffer[16*1024];
|
|
while (ssize_t Amt = ::read(inFile, Buffer, 16*1024)) {
|
|
if (Amt == -1) {
|
|
if (errno != EINTR && errno != EAGAIN)
|
|
ThrowErrno("Can't read source file: " + Src.toString());
|
|
} else {
|
|
char *BufPtr = Buffer;
|
|
while (Amt) {
|
|
ssize_t AmtWritten = ::write(outFile, BufPtr, Amt);
|
|
if (AmtWritten == -1) {
|
|
if (errno != EINTR && errno != EAGAIN)
|
|
ThrowErrno("Can't write destination file: " + Dest.toString());
|
|
} else {
|
|
Amt -= AmtWritten;
|
|
BufPtr += AmtWritten;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
::close(inFile);
|
|
::close(outFile);
|
|
} catch (...) {
|
|
if (inFile != -1)
|
|
::close(inFile);
|
|
if (outFile != -1)
|
|
::close(outFile);
|
|
throw;
|
|
}
|
|
}
|
|
|
|
void
|
|
Path::makeUnique(bool reuse_current) {
|
|
if (reuse_current && !exists())
|
|
return; // File doesn't exist already, just use it!
|
|
|
|
// Append an XXXXXX pattern to the end of the file for use with mkstemp,
|
|
// mktemp or our own implementation.
|
|
char *FNBuffer = (char*) alloca(path.size()+8);
|
|
path.copy(FNBuffer,path.size());
|
|
strcpy(FNBuffer+path.size(), "-XXXXXX");
|
|
|
|
#if defined(HAVE_MKSTEMP)
|
|
int TempFD;
|
|
if ((TempFD = mkstemp(FNBuffer)) == -1) {
|
|
ThrowErrno("Cannot make unique filename for '" + path + "'");
|
|
}
|
|
|
|
// We don't need to hold the temp file descriptor... we will trust that no one
|
|
// will overwrite/delete the file before we can open it again.
|
|
close(TempFD);
|
|
|
|
// Save the name
|
|
path = FNBuffer;
|
|
#elif defined(HAVE_MKTEMP)
|
|
// If we don't have mkstemp, use the old and obsolete mktemp function.
|
|
if (mktemp(FNBuffer) == 0) {
|
|
ThrowErrno("Cannot make unique filename for '" + path + "'");
|
|
}
|
|
|
|
// Save the name
|
|
path = FNBuffer;
|
|
#else
|
|
// Okay, looks like we have to do it all by our lonesome.
|
|
static unsigned FCounter = 0;
|
|
unsigned offset = path.size() + 1;
|
|
while ( FCounter < 999999 && exists()) {
|
|
sprintf(FNBuffer+offset,"%06u",++FCounter);
|
|
path = FNBuffer;
|
|
}
|
|
if (FCounter > 999999)
|
|
throw std::string("Cannot make unique filename for '" + path + "'");
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
// vim: sw=2
|