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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
//
// A Status encapsulates the result of an operation. It may indicate success,
// or it may indicate an error with an associated error message.
//
// Multiple threads can invoke const methods on a Status without
// external synchronization, but if any of the threads may call a
// non-const method, all threads accessing the same Status must use
// external synchronization.
#include "feather/status.h"
#include <assert.h>
namespace feather {
Status::Status(StatusCode code, const std::string& msg, int16_t posix_code) {
assert(code != StatusCode::OK);
const uint32_t size = static_cast<uint32_t>(msg.size());
char* result = new char[size + 7];
memcpy(result, &size, sizeof(size));
result[4] = static_cast<char>(code);
memcpy(result + 5, &posix_code, sizeof(posix_code));
memcpy(result + 7, msg.c_str(), msg.size());
state_ = result;
}
const char* Status::CopyState(const char* state) {
uint32_t size;
memcpy(&size, state, sizeof(size));
char* result = new char[size + 7];
memcpy(result, state, size + 7);
return result;
}
std::string Status::ToString() const {
std::string result(CodeAsString());
if (state_ == NULL) {
return result;
}
result.append(": ");
uint32_t length;
memcpy(&length, state_, sizeof(length));
result.append(state_ + 7, length);
int16_t posix = posix_code();
if (posix != -1) {
char buf[64];
snprintf(buf, sizeof(buf), " (error %d)", posix);
result.append(buf);
}
return result;
}
std::string Status::CodeAsString() const {
if (state_ == NULL) {
return "OK";
}
const char* type = NULL;
switch (code()) {
case StatusCode::OK:
type = "OK";
break;
case StatusCode::OutOfMemory:
type = "Out of memory";
break;
case StatusCode::KeyError:
type = "Key error";
break;
case StatusCode::Invalid:
type = "Invalid";
break;
case StatusCode::IOError:
type = "IO error";
break;
case StatusCode::NotImplemented:
type = "Not implemented";
break;
}
return std::string(type);
}
int16_t Status::posix_code() const {
if (state_ == NULL) {
return 0;
}
int16_t posix_code;
memcpy(&posix_code, state_ + 5, sizeof(posix_code));
return posix_code;
}
} // namespace feather
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