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appended to a path string that didn't end in a slash, yielding invalid path names. Path contribute by Nicholas Riley. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22539 91177308-0d34-0410-b5e6-96231b3b80d8
748 lines
20 KiB
C++
748 lines
20 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/alloca.h"
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#include "Unix.h"
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#if HAVE_UTIME_H
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#include <utime.h>
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#endif
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#if HAVE_TIME_H
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#include <time.h>
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#endif
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#if HAVE_DIRENT_H
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# include <dirent.h>
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# define NAMLEN(dirent) strlen((dirent)->d_name)
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#else
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# define dirent direct
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# define NAMLEN(dirent) (dirent)->d_namlen
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# if HAVE_SYS_NDIR_H
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# include <sys/ndir.h>
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# endif
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# if HAVE_SYS_DIR_H
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# include <sys/dir.h>
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# endif
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# if HAVE_NDIR_H
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# include <ndir.h>
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# endif
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#endif
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// Put in a hack for Cygwin which falsely reports that the mkdtemp function
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// is available when it is not.
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#ifdef __CYGWIN__
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# undef HAVE_MKDTEMP
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#endif
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namespace {
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inline bool lastIsSlash(const std::string& path) {
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return !path.empty() && path[path.length() - 1] == '/';
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}
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}
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namespace llvm {
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using namespace sys;
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Path::Path(const std::string& unverified_path) : path(unverified_path) {
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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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bool
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Path::isValid() const {
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// Check some obvious things
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if (path.empty())
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return false;
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else if (path.length() >= MAXPATHLEN)
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return false;
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// Check that the characters are ascii chars
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size_t len = path.length();
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unsigned i = 0;
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while (i < len && isascii(path[i]))
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++i;
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return i >= len;
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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.set("/");
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return result;
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}
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Path
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Path::GetTemporaryDirectory() {
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#if defined(HAVE_MKDTEMP)
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// The best way is with mkdtemp but that's not available on many systems,
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// Linux and FreeBSD have it. Others probably won't.
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char pathname[MAXPATHLEN];
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strcpy(pathname,"/tmp/llvm_XXXXXX");
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if (0 == mkdtemp(pathname))
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ThrowErrno(std::string(pathname) + ": can't create temporary directory");
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Path result;
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result.set(pathname);
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assert(result.isValid() && "mkdtemp didn't create a valid pathname!");
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return result;
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#elif defined(HAVE_MKSTEMP)
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// If no mkdtemp is available, mkstemp can be used to create a temporary file
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// which is then removed and created as a directory. We prefer this over
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// mktemp because of mktemp's inherent security and threading risks. We still
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// have a slight race condition from the time the temporary file is created to
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// the time it is re-created as a directoy.
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char pathname[MAXPATHLEN];
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strcpy(pathname, "/tmp/llvm_XXXXXX");
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int fd = 0;
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if (-1 == (fd = mkstemp(pathname)))
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ThrowErrno(std::string(pathname) + ": can't create temporary directory");
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::close(fd);
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::unlink(pathname); // start race condition, ignore errors
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if (-1 == ::mkdir(pathname, S_IRWXU)) // end race condition
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ThrowErrno(std::string(pathname) + ": can't create temporary directory");
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Path result;
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result.set(pathname);
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assert(result.isValid() && "mkstemp didn't create a valid pathname!");
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return result;
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#elif defined(HAVE_MKTEMP)
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// If a system doesn't have mkdtemp(3) or mkstemp(3) but it does have
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// mktemp(3) then we'll assume that system (e.g. AIX) has a reasonable
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// implementation of mktemp(3) and doesn't follow BSD 4.3's lead of replacing
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// the XXXXXX with the pid of the process and a letter. That leads to only
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// twenty six temporary files that can be generated.
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char pathname[MAXPATHLEN];
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strcpy(pathname, "/tmp/llvm_XXXXXX");
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char *TmpName = ::mktemp(pathname);
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if (TmpName == 0)
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ThrowErrno(std::string(TmpName) + ": can't create unique directory name");
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if (-1 == ::mkdir(TmpName, S_IRWXU))
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ThrowErrno(std::string(TmpName) + ": can't create temporary directory");
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Path result;
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result.set(TmpName);
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assert(result.isValid() && "mktemp didn't create a valid pathname!");
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return result;
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#else
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// This is the worst case implementation. tempnam(3) leaks memory unless its
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// on an SVID2 (or later) system. On BSD 4.3 it leaks. tmpnam(3) has thread
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// issues. The mktemp(3) function doesn't have enough variability in the
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// temporary name generated. So, we provide our own implementation that
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// increments an integer from a random number seeded by the current time. This
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// should be sufficiently unique that we don't have many collisions between
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// processes. Generally LLVM processes don't run very long and don't use very
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// many temporary files so this shouldn't be a big issue for LLVM.
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static time_t num = ::time(0);
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char pathname[MAXPATHLEN];
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do {
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num++;
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sprintf(pathname, "/tmp/llvm_%010u", unsigned(num));
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} while ( 0 == access(pathname, F_OK ) );
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if (-1 == ::mkdir(pathname, S_IRWXU))
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ThrowErrno(std::string(pathname) + ": can't create temporary directory");
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Path result;
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result.set(pathname);
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assert(result.isValid() && "mkstemp didn't create a valid pathname!");
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return result;
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#endif
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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.set(tmp))
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if (tmpPath.canRead())
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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.set(std::string(at)))
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if (tmpPath.canRead())
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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.set(LLVM_LIBDIR))
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if (tmpPath.canRead())
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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.set(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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if (!exists())
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return false;
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struct stat buf;
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if (0 != stat(path.c_str(), &buf)) {
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ThrowErrno(path + ": can't determine type of path object: ");
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}
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return S_ISREG(buf.st_mode);
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}
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bool
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Path::isDirectory() const {
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if (!exists())
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return false;
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struct stat buf;
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if (0 != stat(path.c_str(), &buf)) {
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ThrowErrno(path + ": can't determine type of path object: ");
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}
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return S_ISDIR(buf.st_mode);
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}
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bool
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Path::isHidden() const {
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if (!exists())
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return false;
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size_t slash = path.rfind('/');
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return (slash != std::string::npos &&
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slash < path.length()-1 &&
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path[slash+1] == '.') ||
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(!path.empty() && slash == std::string::npos && path[0] == '.');
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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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size_t dot = path.rfind('.');
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if (dot == std::string::npos || dot < slash)
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return path.substr(slash);
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else
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return path.substr(slash, dot - slash);
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}
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bool Path::hasMagicNumber(const std::string &Magic) const {
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if (!isFile())
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return false;
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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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if (!isFile())
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return false;
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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::canRead() 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::canWrite() 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::canExecute() const {
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if (0 != access(path.c_str(), R_OK | X_OK ))
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return false;
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struct stat st;
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int r = stat(path.c_str(), &st);
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if (r != 0 || !S_ISREG(st.st_mode))
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return false;
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return true;
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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(path + ": can't determine type of path object: ");
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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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}
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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::makeReadableOnDisk() {
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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::makeWriteableOnDisk() {
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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::makeExecutableOnDisk() {
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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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std::string dirPath = path;
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if (!lastIsSlash(dirPath))
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dirPath += '/';
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result.clear();
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struct dirent* de = ::readdir(direntries);
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for ( ; de != 0; de = ::readdir(direntries)) {
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if (de->d_name[0] != '.') {
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Path aPath(dirPath + (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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int stat_errno = errno;
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struct stat st;
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if (0 == lstat(aPath.path.c_str(), &st) && S_ISLNK(st.st_mode))
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continue; // dangling symlink -- ignore
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ThrowErrno(aPath.path +
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": can't determine file object type", stat_errno);
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}
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result.insert(aPath);
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}
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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::set(const std::string& a_path) {
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if (a_path.empty())
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return false;
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std::string save(path);
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path = a_path;
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if (!isValid()) {
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path = save;
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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::appendComponent(const std::string& name) {
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if (name.empty())
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return false;
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std::string save(path);
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if (!lastIsSlash(path))
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path += '/';
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path += name;
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if (!isValid()) {
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path = save;
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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::eraseComponent() {
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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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path.erase();
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return true;
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}
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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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path.erase();
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return true;
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}
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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::appendSuffix(const std::string& suffix) {
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std::string save(path);
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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;
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return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
Path::eraseSuffix() {
|
|
std::string save = path;
|
|
size_t dotpos = path.rfind('.',path.size());
|
|
size_t slashpos = path.rfind('/',path.size());
|
|
if (dotpos != std::string::npos) {
|
|
if (slashpos == std::string::npos || dotpos > slashpos+1) {
|
|
path.erase(dotpos, path.size()-dotpos);
|
|
return true;
|
|
}
|
|
}
|
|
if (!isValid())
|
|
path = save;
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
Path::createDirectoryOnDisk( bool create_parents) {
|
|
// 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::createFileOnDisk() {
|
|
// 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::createTemporaryFileOnDisk(bool reuse_current) {
|
|
// Make this into a unique file name
|
|
makeUnique( reuse_current );
|
|
|
|
// create the file
|
|
int outFile = ::open(path.c_str(), O_WRONLY|O_CREAT|O_TRUNC, 0666);
|
|
if (outFile != -1) {
|
|
::close(outFile);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
Path::eraseFromDisk(bool remove_contents) const {
|
|
// Make sure we're dealing with a directory
|
|
if (isFile()) {
|
|
if (0 != unlink(path.c_str()))
|
|
ThrowErrno(path + ": can't destroy file");
|
|
} else if (isDirectory()) {
|
|
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");
|
|
}
|
|
}
|
|
else
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
Path::renamePathOnDisk(const Path& newName) {
|
|
if (0 != ::rename(path.c_str(), newName.c_str()))
|
|
ThrowErrno(std::string("can't rename '") + path + "' as '" +
|
|
newName.toString() + "' ");
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
Path::setStatusInfoOnDisk(const StatusInfo& si) const {
|
|
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;
|
|
}
|
|
|
|
void
|
|
sys::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(Src.toString() + ": can't open source file to copy: ");
|
|
|
|
outFile = ::open(Dest.c_str(), O_WRONLY|O_CREAT, 0666);
|
|
if (outFile == -1)
|
|
ThrowErrno(Dest.toString() +": can't create destination file for copy: ");
|
|
|
|
char Buffer[16*1024];
|
|
while (ssize_t Amt = ::read(inFile, Buffer, 16*1024)) {
|
|
if (Amt == -1) {
|
|
if (errno != EINTR && errno != EAGAIN)
|
|
ThrowErrno(Src.toString()+": can't read source file: ");
|
|
} else {
|
|
char *BufPtr = Buffer;
|
|
while (Amt) {
|
|
ssize_t AmtWritten = ::write(outFile, BufPtr, Amt);
|
|
if (AmtWritten == -1) {
|
|
if (errno != EINTR && errno != EAGAIN)
|
|
ThrowErrno(Dest.toString() + ": can't write destination file: ");
|
|
} 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(path + ": can't make unique filename");
|
|
}
|
|
|
|
// 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(path + ": can't make unique filename");
|
|
}
|
|
|
|
// 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(path + ": can't make unique filename: too many files");
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|