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/*
*
* Copyright (C) 2021, OFFIS e.V.
* All rights reserved. See COPYRIGHT file for details.
*
* This software and supporting documentation were developed by
*
* OFFIS e.V.
* R&D Division Health
* Escherweg 2
* D-26121 Oldenburg, Germany
*
*
* Module: ofstd
*
* Author: Nikolas Goldhammer
*
* Purpose:
* Implementing platform abstracting error code handling.
*
*/
#include "dcmtk/config/osconfig.h" /* make sure OS specific configuration is included first */
// Only provide the implementation if the STL one is not used
#if !defined(HAVE_STL_SYSTEM_ERROR) || !defined(HAVE_STL_STRING)
#include "dcmtk/ofstd/ofstd.h"
#include "dcmtk/ofstd/oferror.h"
#include "dcmtk/ofstd/ofdiag.h"
#ifdef HAVE_WINDOWS_H
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
// all error categories are derived from the base error category.
struct OFgeneric_error_category : OFerror_category
{
static const char* unknownError()
{
return "Unknown error.";
}
// default constructor, since older versions of clang insist
inline OFgeneric_error_category() {}
const char* name() const
{
return "generic";
}
OFString message( int code ) const
{
char buffer[256];
const char* const result = OFStandard::strerror( code, buffer, 256 );
return OFString( result ? result : unknownError() );
}
};
struct OFsystem_error_category : OFgeneric_error_category
{
// default constructor, since older versions of clang insist
inline OFsystem_error_category() {}
const char* name() const
{
return "system";
}
// only Windows has custom error codes, all others can simply use strerror from the generic category
#ifdef _WIN32
OFString message( int code ) const
{
struct RAIICleaner
{
RAIICleaner() : buffer( OFnullptr ) {}
~RAIICleaner() { LocalFree( buffer ); }
LPSTR buffer;
};
OFString message;
{
RAIICleaner cleanup;
if
(
FormatMessageA
(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
OFnullptr,
code,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
OFreinterpret_cast(LPSTR, &cleanup.buffer),
0,
OFnullptr
) > 0
)
{
message = cleanup.buffer;
// remove trailing "\r\n" FormatMessage() may potentially add although we never asked for this
if( message.length() >= 2 && message.substr( message.length() - 2 ) == "\r\n" )
message = message.substr( 0, message.length() - 2 );
}
}
if( message.empty() )
message = unknownError();
return message;
}
#endif
};
OFerror_code::OFerror_code()
: m_Code( 0 )
, m_Category( &OFsystem_category() )
{
}
OFerror_code::OFerror_code( int code, const OFerror_category& category )
: m_Code( code )
, m_Category( &category )
{
}
void OFerror_code::assign( int code, const OFerror_category& category )
{
m_Code = code;
m_Category = &category;
}
void OFerror_code::clear()
{
m_Code = 0;
m_Category = &OFsystem_category();
}
int OFerror_code::value() const
{
return m_Code;
}
const OFerror_category& OFerror_code::category() const
{
return *m_Category;
}
OFString OFerror_code::message() const
{
return m_Category->message( value() );
}
OFBool OFerror_code::operator!=( const OFerror_code& rhs ) const
{
return m_Code != rhs.m_Code || m_Category != rhs.m_Category;
}
OFBool OFerror_code::operator==( const OFerror_code& rhs ) const
{
return m_Code == rhs.m_Code && m_Category == rhs.m_Category;
}
OFBool OFerror_code::operator<( const OFerror_code& rhs ) const
{
return m_Category < rhs.m_Category || ( m_Category == rhs.m_Category && m_Code < rhs.m_Code );
}
OFerror_code::operator OFBool() const
{
#include DCMTK_DIAGNOSTIC_PUSH
#include DCMTK_DIAGNOSTIC_IGNORE_VISUAL_STUDIO_PERFORMANCE_WARNING
return m_Code;
#include DCMTK_DIAGNOSTIC_POP
}
DCMTK_OFSTD_EXPORT const OFerror_category& OFsystem_category()
{
static const OFsystem_error_category system_category_const;
return system_category_const;
}
DCMTK_OFSTD_EXPORT const OFerror_category& OFgeneric_category()
{
static const OFgeneric_error_category generic_category_const;
return generic_category_const;
}
// helper class to ensure both categories are initialized before main(),
// such that there will not be any race conditions in the singletons
struct InitErrorCategories
{
static InitErrorCategories Init;
InitErrorCategories()
{
OFstatic_cast(void, OFsystem_category());
OFstatic_cast(void, OFgeneric_category());
}
};
InitErrorCategories InitErrorCategories::Init;
#else
int ofstd_oferror_cc_dummy_to_keep_linker_from_moaning = 0;
#endif // !HAVE_STL_SYSTEM_ERROR OR !HAVE_STL_STRING
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