llvm-6502/lib/System/Win32/Path.cpp
Reid Spencer 6a0ec6fcf6 Improve validity checking of windows path names and fix file creation
problems.

Patch contributed by Jeff Cohen. Thanks Jeff!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16565 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-29 00:01:17 +00:00

546 lines
14 KiB
C++

//===- llvm/System/Linux/Path.cpp - Linux 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.
//
// Modified by Henrik Bach to comply with at least MinGW.
// Ported to Win32 by Jeff Cohen.
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 specific implementation of the Path class.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic Win32 code that
//=== is guaranteed to work on *all* Win32 variants.
//===----------------------------------------------------------------------===//
#include "Win32.h"
#include <llvm/System/Path.h>
#include <fstream>
#include <malloc.h>
static void FlipBackSlashes(std::string& s) {
for (size_t i = 0; i < s.size(); i++)
if (s[i] == '\\')
s[i] = '/';
}
namespace llvm {
namespace sys {
bool
Path::is_valid() const {
if (path.empty())
return false;
// If there is a colon, it must be the second character, preceded by a letter
// and followed by something.
size_t len = path.size();
size_t pos = path.rfind(':',len);
if (pos != std::string::npos) {
if (pos != 1 || !isalpha(path[0]) || len < 3)
return false;
}
// Check for illegal characters.
if (path.find_first_of("\\<>\"|\001\002\003\004\005\006\007\010\011\012"
"\013\014\015\016\017\020\021\022\023\024\025\026"
"\027\030\031\032\033\034\035\036\037")
!= std::string::npos)
return false;
// A file or directory name may not end in a period.
if (path[len-1] == '.')
return false;
if (len >= 2 && path[len-2] == '.' && path[len-1] == '/')
return false;
// A file or directory name may not end in a space.
if (path[len-1] == ' ')
return false;
if (len >= 2 && path[len-2] == ' ' && path[len-1] == '/')
return false;
return true;
}
static Path *TempDirectory = NULL;
Path
Path::GetTemporaryDirectory() {
if (TempDirectory)
return *TempDirectory;
char pathname[MAX_PATH];
if (!GetTempPath(MAX_PATH, pathname))
throw std::string("Can't determine temporary directory");
Path result;
result.set_directory(pathname);
// Append a subdirectory passed on our process id so multiple LLVMs don't
// step on each other's toes.
sprintf(pathname, "LLVM_%u", GetCurrentProcessId());
result.append_directory(pathname);
// If there's a directory left over from a previous LLVM execution that
// happened to have the same process id, get rid of it.
result.destroy_directory(true);
// And finally (re-)create the empty directory.
result.create_directory(false);
TempDirectory = new Path(result);
return *TempDirectory;
}
Path::Path(std::string unverified_path)
: path(unverified_path)
{
FlipBackSlashes(path);
if (unverified_path.empty())
return;
if (this->is_valid())
return;
// oops, not valid.
path.clear();
throw std::string(unverified_path + ": path is not valid");
}
// FIXME: the following set of functions don't map to Windows very well.
Path
Path::GetRootDirectory() {
Path result;
result.set_directory("/");
return result;
}
std::string
Path::GetDLLSuffix() {
return "dll";
}
static inline bool IsLibrary(Path& path, const std::string& basename) {
if (path.append_file(std::string("lib") + basename)) {
if (path.append_suffix(Path::GetDLLSuffix()) && path.readable())
return true;
else if (path.elide_suffix() && path.append_suffix("a") && path.readable())
return true;
else if (path.elide_suffix() && path.append_suffix("o") && path.readable())
return true;
else if (path.elide_suffix() && path.append_suffix("bc") && path.readable())
return true;
} else if (path.elide_file() && path.append_file(basename)) {
if (path.append_suffix(Path::GetDLLSuffix()) && path.readable())
return true;
else if (path.elide_suffix() && path.append_suffix("a") && path.readable())
return true;
else if (path.elide_suffix() && path.append_suffix("o") && path.readable())
return true;
else if (path.elide_suffix() && path.append_suffix("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.set_directory(*I) && IsLibrary(result,basename))
return result;
}
// Try the LLVM lib directory in the LLVM install area
//if (result.set_directory(LLVM_LIBDIR) && IsLibrary(result,basename))
// return result;
// Try /usr/lib
if (result.set_directory("/usr/lib/") && IsLibrary(result,basename))
return result;
// Try /lib
if (result.set_directory("/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() {
return GetLLVMDefaultConfigDir();
}
Path
Path::GetUserHomeDirectory() {
const char* home = getenv("HOME");
if (home) {
Path result;
if (result.set_directory(home))
return result;
}
return GetRootDirectory();
}
// FIXME: the above set of functions don't map to Windows very well.
bool
Path::is_file() const {
return (is_valid() && path[path.length()-1] != '/');
}
bool
Path::is_directory() const {
return (is_valid() && path[path.length()-1] == '/');
}
std::string
Path::get_basename() 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::has_magic_number(const std::string &Magic) const {
size_t len = Magic.size();
char *buf = reinterpret_cast<char *>(_alloca(len+1));
std::ifstream f(path.c_str());
f.read(buf, len);
buf[len] = '\0';
return Magic == buf;
}
bool
Path::is_bytecode_file() const {
if (readable()) {
return has_magic_number("llvm");
}
return false;
}
bool
Path::is_archive() const {
if (readable()) {
return has_magic_number("!<arch>\012");
}
return false;
}
bool
Path::exists() const {
DWORD attr = GetFileAttributes(path.c_str());
return attr != INVALID_FILE_ATTRIBUTES;
}
bool
Path::readable() const {
// FIXME: take security attributes into account.
DWORD attr = GetFileAttributes(path.c_str());
return attr != INVALID_FILE_ATTRIBUTES;
}
bool
Path::writable() const {
// FIXME: take security attributes into account.
DWORD attr = GetFileAttributes(path.c_str());
return (attr != INVALID_FILE_ATTRIBUTES) && !(attr & FILE_ATTRIBUTE_READONLY);
}
bool
Path::executable() const {
// FIXME: take security attributes into account.
DWORD attr = GetFileAttributes(path.c_str());
return attr != INVALID_FILE_ATTRIBUTES;
}
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);
}
bool
Path::set_directory(const std::string& a_path) {
if (a_path.size() == 0)
return false;
Path save(*this);
path = a_path;
FlipBackSlashes(path);
size_t last = a_path.size() -1;
if (last != 0 && a_path[last] != '/')
path += '/';
if (!is_valid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::set_file(const std::string& a_path) {
if (a_path.size() == 0)
return false;
Path save(*this);
path = a_path;
FlipBackSlashes(path);
size_t last = a_path.size() - 1;
while (last > 0 && a_path[last] == '/')
last--;
path.erase(last+1);
if (!is_valid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::append_directory(const std::string& dir) {
if (is_file())
return false;
Path save(*this);
path += dir;
path += "/";
if (!is_valid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::elide_directory() {
if (is_file())
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::append_file(const std::string& file) {
if (!is_directory())
return false;
Path save(*this);
path += file;
if (!is_valid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::elide_file() {
if (is_directory())
return false;
size_t slashpos = path.rfind('/',path.size());
if (slashpos == std::string::npos)
return false;
path.erase(slashpos+1);
return true;
}
bool
Path::append_suffix(const std::string& suffix) {
if (is_directory())
return false;
Path save(*this);
path.append(".");
path.append(suffix);
if (!is_valid()) {
path = save.path;
return false;
}
return true;
}
bool
Path::elide_suffix() {
if (is_directory()) 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::create_directory( bool create_parents) {
// Make sure we're dealing with a directory
if (!is_directory()) return false;
// Get a writeable copy of the path name
char *pathname = reinterpret_cast<char *>(_alloca(path.length()+1));
path.copy(pathname,path.length());
pathname[path.length()] = 0;
// Determine starting point for initial / search.
char *next = pathname;
if (pathname[0] == '/' && pathname[1] == '/') {
// Skip host name.
next = strchr(pathname+2, '/');
if (next == NULL)
throw std::string(pathname) + ": badly formed remote directory";
// Skip share name.
next = strchr(next+1, '/');
if (next == NULL)
throw std::string(pathname) + ": badly formed remote directory";
next++;
if (*next == 0)
throw std::string(pathname) + ": badly formed remote directory";
} else {
if (pathname[1] == ':')
next += 2; // skip drive letter
if (*next == '/')
next++; // skip root directory
}
// If we're supposed to create intermediate directories
if (create_parents) {
// Loop through the directory components until we're done
while (*next) {
next = strchr(next, '/');
*next = 0;
if (!CreateDirectory(pathname, NULL))
ThrowError(std::string(pathname) + ": Can't create directory: ");
*next++ = '/';
}
} else {
// Drop trailing slash.
pathname[path.size()-1] = 0;
if (!CreateDirectory(pathname, NULL)) {
ThrowError(std::string(pathname) + ": Can't create directory: ");
}
}
return true;
}
bool
Path::create_file() {
// Make sure we're dealing with a file
if (!is_file()) return false;
// Create the file
HANDLE h = CreateFile(path.c_str(), GENERIC_WRITE, 0, NULL, CREATE_NEW,
FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE)
ThrowError(std::string(path.c_str()) + ": Can't create file: ");
CloseHandle(h);
return true;
}
bool
Path::destroy_directory(bool remove_contents) {
// Make sure we're dealing with a directory
if (!is_directory()) return false;
// If it doesn't exist, we're done.
if (!exists()) return true;
char *pathname = reinterpret_cast<char *>(_alloca(path.length()+1));
path.copy(pathname,path.length()+1);
int lastchar = path.length() - 1 ;
if (pathname[lastchar] == '/')
pathname[lastchar] = 0;
if (remove_contents) {
// Recursively descend the directory to remove its content
// FIXME: The correct way of doing this on Windows isn't pretty...
// but this may work if unix-like utils are present.
std::string cmd("rm -rf ");
cmd += path;
system(cmd.c_str());
} else {
// Otherwise, try to just remove the one directory
if (!RemoveDirectory(pathname))
ThrowError(std::string(pathname) + ": Can't destroy directory: ");
}
return true;
}
bool
Path::destroy_file() {
if (!is_file()) return false;
DWORD attr = GetFileAttributes(path.c_str());
// If it doesn't exist, we're done.
if (attr == INVALID_FILE_ATTRIBUTES)
return true;
// Read-only files cannot be deleted on Windows. Must remove the read-only
// attribute first.
if (attr & FILE_ATTRIBUTE_READONLY) {
if (!SetFileAttributes(path.c_str(), attr & ~FILE_ATTRIBUTE_READONLY))
ThrowError(std::string(path.c_str()) + ": Can't destroy file: ");
}
if (!DeleteFile(path.c_str()))
ThrowError(std::string(path.c_str()) + ": Can't destroy file: ");
return true;
}
}
}
// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab