libcruft-util/net/except.cpp
2015-04-13 18:06:08 +10:00

126 lines
2.9 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2011 Danny Robson <danny@nerdcruft.net>
*/
#include "except.hpp"
#include "../debug.hpp"
#include "../types/casts.hpp"
//-----------------------------------------------------------------------------
using namespace std;
using namespace net;
//-----------------------------------------------------------------------------
net::error::error (const std::string &_what):
runtime_error (_what)
{ ; }
net::error::error (int _code):
runtime_error (strerror (_code))
{ CHECK (_code != 0); }
//-----------------------------------------------------------------------------
std::string
net::error::code_to_string (int code) {
#ifdef __WIN32
char message[256];
// It should be fine to signcast the code here as Windows guarantees all
// error messages are positive but appears to use int for compatibility
DWORD output = FormatMessage (0, NULL, sign_cast<unsigned> (code), 0, message, sizeof (message), NULL);
CHECK_NEQ (output, 0);
return std::string (message);
#else
return strerror (code);
#endif
}
//-----------------------------------------------------------------------------
void
net::error::throw_code (int code) {
#ifdef __WIN32
throw net::error (code);
#else
CHECK (code != 0);
switch (code) {
#define ERROR_CODE(c) \
case c: \
throw net::error_code<c> (); \
break;
ERROR_CODE(ECONNREFUSED);
ERROR_CODE(ECONNRESET);
ERROR_CODE(EINVAL);
ERROR_CODE(ENOTCONN);
default:
unreachable ();
#undef ERROR_CODE
}
#endif
}
void
net::error::throw_code (void)
{ throw_code (last_code ()); }
//-----------------------------------------------------------------------------
void
net::error::try_code (int err) {
if (err == 0)
return;
throw_code (err);
}
void
net::error::try_code (void)
{ try_code (last_code ()); }
//-----------------------------------------------------------------------------
int
net::error::last_code (void) {
#ifdef __WIN32
return WSAGetLastError ();
#else
return errno;
#endif
}
//-----------------------------------------------------------------------------
template <int CODE>
net::error_code<CODE>::error_code (void):
net::error (CODE)
{ ; }
template <int CODE>
int
net::error_code<CODE>::code (void) const
{ return CODE; }