PlatformFile::PlatformFile(const std::string& path, int mode, int perms) {
int oflag = 0;
bool may_create = false;
bool check_existence = false;
if ((mode & PF_READ) == PF_READ && (mode & PF_WRITE) == PF_WRITE) {
oflag = O_RDWR;
} else if ((mode & PF_READ) == PF_READ) {
oflag = O_RDONLY;
} else if ((mode & PF_WRITE) == PF_WRITE) {
oflag = O_WRONLY;
}
switch (PF_GET_OPTIONS(mode)) {
case PF_GET_OPTIONS(PF_CREATE_ALWAYS):
oflag |= O_CREAT;
may_create = true;
break;
case PF_GET_OPTIONS(PF_CREATE_NEW):
oflag |= O_CREAT | O_EXCL;
may_create = true;
break;
case PF_GET_OPTIONS(PF_OPEN_EXISTING):
check_existence = true;
break;
case PF_GET_OPTIONS(PF_TRUNCATE):
if (mode & PF_WRITE) {
oflag |= O_TRUNC;
}
break;
default:
break;
}
if ((mode & PF_NONBLOCK) == PF_NONBLOCK) {
oflag |= O_NONBLOCK;
is_nonblock_ = true;
}
if ((mode & PF_APPEND) == PF_APPEND) {
oflag |= O_APPEND;
}
if (perms == -1 && may_create) {
perms = 0666;
}
if (check_existence && !fs::exists(path.c_str())) {
handle_ = kInvalidHandle;
} else {
handle_ = ::open(path.c_str(), oflag, perms);
}
}
PlatformFile::PlatformFile(const fs::path& path, int mode, int perms)
: fname_(path) {
int oflag = 0;
bool may_create = false;
bool check_existence = false;
if ((mode & PF_READ) == PF_READ && (mode & PF_WRITE) == PF_WRITE) {
oflag = O_RDWR;
} else if ((mode & PF_READ) == PF_READ) {
oflag = O_RDONLY;
} else if ((mode & PF_WRITE) == PF_WRITE) {
oflag = O_WRONLY;
}
switch (PF_GET_OPTIONS(mode)) {
case PF_GET_OPTIONS(PF_CREATE_ALWAYS):
oflag |= O_CREAT | O_TRUNC;
may_create = true;
break;
case PF_GET_OPTIONS(PF_CREATE_NEW):
oflag |= O_CREAT | O_EXCL;
may_create = true;
break;
case PF_GET_OPTIONS(PF_OPEN_EXISTING):
check_existence = true;
break;
case PF_GET_OPTIONS(PF_OPEN_ALWAYS):
oflag |= O_CREAT;
may_create = true;
break;
case PF_GET_OPTIONS(PF_TRUNCATE):
if (mode & PF_WRITE) {
oflag |= O_TRUNC;
}
break;
default:
break;
}
if ((mode & PF_NONBLOCK) == PF_NONBLOCK) {
oflag |= O_NONBLOCK;
is_nonblock_ = true;
}
if ((mode & PF_APPEND) == PF_APPEND) {
oflag |= O_APPEND;
}
if (perms == -1 && may_create) {
perms = 0666;
}
boost::system::error_code ec;
if (check_existence &&
(!fs::exists(fname_, ec) || ec.value() != errc::success)) {
handle_ = kInvalidHandle;
} else {
handle_ = ::open(fname_.c_str(), oflag, perms);
}
}
