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path: root/src/dpl/core/src/errno_string.cpp
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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/assert.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