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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16395 91177308-0d34-0410-b5e6-96231b3b80d8
425 lines
9.8 KiB
C++
425 lines
9.8 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 "Unix.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <fstream>
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namespace llvm {
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using namespace sys;
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Path::Path(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->is_valid())
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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.set_directory("/");
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return result;
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}
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static inline bool IsLibrary(Path& path, const std::string& basename) {
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if (path.append_file(std::string("lib") + basename)) {
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if (path.append_suffix(Path::GetDLLSuffix()) && path.readable())
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return true;
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else if (path.elide_suffix() && path.append_suffix("a") && path.readable())
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return true;
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else if (path.elide_suffix() && path.append_suffix("o") && path.readable())
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return true;
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else if (path.elide_suffix() && path.append_suffix("bc") && path.readable())
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return true;
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} else if (path.elide_file() && path.append_file(basename)) {
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if (path.append_suffix(Path::GetDLLSuffix()) && path.readable())
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return true;
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else if (path.elide_suffix() && path.append_suffix("a") && path.readable())
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return true;
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else if (path.elide_suffix() && path.append_suffix("o") && path.readable())
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return true;
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else if (path.elide_suffix() && path.append_suffix("bc") && path.readable())
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return true;
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}
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path.clear();
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return false;
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}
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Path
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Path::GetLibraryPath(const std::string& basename,
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const std::vector<std::string>& LibPaths) {
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Path result;
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// Try the paths provided
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for (std::vector<std::string>::const_iterator I = LibPaths.begin(),
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E = LibPaths.end(); I != E; ++I ) {
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if (result.set_directory(*I) && IsLibrary(result,basename))
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return result;
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}
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// Try the LLVM lib directory in the LLVM install area
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if (result.set_directory(LLVM_LIBDIR) && IsLibrary(result,basename))
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return result;
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// Try /usr/lib
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if (result.set_directory("/usr/lib/") && IsLibrary(result,basename))
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return result;
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// Try /lib
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if (result.set_directory("/lib/") && IsLibrary(result,basename))
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return result;
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// Can't find it, give up and return invalid path.
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result.clear();
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return result;
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}
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Path
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Path::GetSystemLibraryPath1() {
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return Path("/lib/");
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}
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Path
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Path::GetSystemLibraryPath2() {
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return Path("/usr/lib/");
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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::GetLLVMConfigDir() {
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Path result;
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if (result.set_directory(LLVM_ETCDIR))
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return result;
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return GetLLVMDefaultConfigDir();
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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_directory(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::is_file() const {
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return (is_valid() && path[path.length()-1] != '/');
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}
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bool
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Path::is_directory() const {
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return (is_valid() && path[path.length()-1] == '/');
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}
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std::string
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Path::get_basename() 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::has_magic_number(const std::string &Magic) const {
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size_t len = Magic.size();
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char buf[ 1 + len];
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std::ifstream f(path.c_str());
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f.read(buf, len);
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buf[len] = '\0';
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return Magic == buf;
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}
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bool
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Path::is_bytecode_file() const {
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if (readable()) {
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return has_magic_number("llvm");
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}
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return false;
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}
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bool
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Path::is_archive() const {
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if (readable()) {
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return has_magic_number("!<arch>\012");
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}
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return false;
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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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bool
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Path::set_directory(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 (last != 0 && a_path[last] != '/')
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path += '/';
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if (!is_valid()) {
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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::set_file(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 (!is_valid()) {
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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::append_directory(const std::string& dir) {
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if (is_file())
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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 (!is_valid()) {
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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::elide_directory() {
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if (is_file())
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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::append_file(const std::string& file) {
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if (!is_directory())
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return false;
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Path save(*this);
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path += file;
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if (!is_valid()) {
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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::elide_file() {
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if (is_directory())
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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::append_suffix(const std::string& suffix) {
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if (is_directory())
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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 (!is_valid()) {
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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::elide_suffix() {
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if (is_directory()) 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::create_directory( bool create_parents) {
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// Make sure we're dealing with a directory
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if (!is_directory()) 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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// 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(pathname,'/');
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*save = '/';
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}
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} else if (0 != mkdir(pathname, S_IRWXU | S_IRWXG)) {
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ThrowErrno(std::string(pathname) + ": Can't create 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::create_file() {
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// Make sure we're dealing with a file
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if (!is_file()) 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(std::string(path.c_str()) + ": 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::destroy_directory(bool remove_contents) {
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// Make sure we're dealing with a directory
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if (!is_directory()) 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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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::destroy_file() {
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if (!is_file()) return false;
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if (0 != unlink(path.c_str()))
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ThrowErrno(std::string(path.c_str()) + ": Can't destroy file");
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return true;
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}
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}
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// vim: sw=2
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