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//===- llvm/Support/Unix/PathV2.cpp - Unix Path Implementation --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Unix specific implementation of the PathV2 API.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic UNIX code that
//=== is guaranteed to work on *all* UNIX variants.
//===----------------------------------------------------------------------===//
#include "Unix.h"
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
namespace {
struct AutoFD {
int FileDescriptor;
AutoFD(int fd) : FileDescriptor(fd) {}
~AutoFD() {
if (FileDescriptor >= 0)
::close(FileDescriptor);
}
int take() {
int ret = FileDescriptor;
FileDescriptor = -1;
return ret;
}
operator int() const {return FileDescriptor;}
};
}
namespace llvm {
namespace sys {
namespace path {
error_code current_path(SmallVectorImpl<char> &result) {
long size = ::pathconf(".", _PC_PATH_MAX);
result.reserve(size + 1);
result.set_size(size + 1);
if (::getcwd(result.data(), result.size()) == 0)
return error_code(errno, system_category());
result.set_size(strlen(result.data()));
return make_error_code(errc::success);
}
} // end namespace path
namespace fs{
error_code copy_file(const Twine &from, const Twine &to, copy_option copt) {
// Get arguments.
SmallString<128> from_storage;
SmallString<128> to_storage;
StringRef f = from.toStringRef(from_storage);
StringRef t = to.toStringRef(to_storage);
const size_t buf_sz = 32768;
char buffer[buf_sz];
int from_file = -1, to_file = -1;
// Open from.
if ((from_file = ::open(f.begin(), O_RDONLY)) < 0)
return error_code(errno, system_category());
AutoFD from_fd(from_file);
// Stat from.
struct stat from_stat;
if (::stat(f.begin(), &from_stat) != 0)
return error_code(errno, system_category());
// Setup to flags.
int to_flags = O_CREAT | O_WRONLY;
if (copt == copy_option::fail_if_exists)
to_flags |= O_EXCL;
// Open to.
if ((to_file = ::open(t.begin(), to_flags, from_stat.st_mode)) < 0)
return error_code(errno, system_category());
AutoFD to_fd(to_file);
// Copy!
ssize_t sz, sz_read = 1, sz_write;
while (sz_read > 0 &&
(sz_read = ::read(from_fd, buffer, buf_sz)) > 0) {
// Allow for partial writes - see Advanced Unix Programming (2nd Ed.),
// Marc Rochkind, Addison-Wesley, 2004, page 94
sz_write = 0;
do {
if ((sz = ::write(to_fd, buffer + sz_write, sz_read - sz_write)) < 0) {
sz_read = sz; // cause read loop termination.
break; // error.
}
sz_write += sz;
} while (sz_write < sz_read);
}
// After all the file operations above the return value of close actually
// matters.
if (::close(from_fd.take()) < 0) sz_read = -1;
if (::close(to_fd.take()) < 0) sz_read = -1;
// Check for errors.
if (sz_read < 0)
return error_code(errno, system_category());
return make_error_code(errc::success);
}
} // end namespace fs
} // end namespace sys
} // end namespace llvm
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