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/*
* Copyright (c) 2011 Samsung Electronics Co., Ltd All Rights Reserved
*
* 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.
*/
/*
* @file errno_string.h
* @author Przemyslaw Dobrowolski (p.dobrowolsk@samsung.com)
* @version 1.0
* @brief This file is the implementation file of errno string
*/
#include <stddef.h>
#include <string>
#include <cstddef>
#include <cstring>
#include <malloc.h>
#include <cerrno>
#include <stdexcept>
#include <cchecker/dpl/errno_string.h>
#include <cchecker/dpl/assert.h>
#include <cchecker/dpl/exception.h>
#include <cchecker/dpl/scoped_free.h>
namespace CCHECKER {
namespace { // anonymous
const size_t DEFAULT_ERRNO_STRING_SIZE = 32;
} // namespace anonymous
std::string GetErrnoString(int error)
{
size_t size = DEFAULT_ERRNO_STRING_SIZE;
char *buffer = NULL;
for (;;) {
// Add one extra characted for end of string null value
char *newBuffer = static_cast<char *>(::realloc(buffer, size + 1));
if (!newBuffer) {
// Failed to realloc
::free(buffer);
throw std::bad_alloc();
}
// Setup reallocated buffer
buffer = newBuffer;
::memset(buffer, 0, size + 1);
// Try to retrieve error string
#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE
// The XSI-compliant version of strerror_r() is provided if:
int result = ::strerror_r(error, buffer, size);
if (result == 0) {
ScopedFree<char> scopedBufferFree(buffer);
return std::string(buffer);
}
#else
errno = 0;
// Otherwise, the GNU-specific version is provided.
char *result = ::strerror_r(error, buffer, size);
if (result != NULL) {
ScopedFree<char> scopedBufferFree(buffer);
return std::string(result);
}
#endif
// Interpret errors
switch (errno) {
case EINVAL:
// We got an invalid errno value
::free(buffer);
ThrowMsg(InvalidErrnoValue, "Invalid errno value: " << error);
case ERANGE:
// Incease buffer size and retry
size <<= 1;
continue;
default:
Assert(0 && "Invalid errno value after call to strerror_r!");
}
}
}
} // namespace CCHECKER
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