cpl_error.h

/**********************************************************************
 * $Id$
 *
 * Name:     cpl_error.h
 * Project:  CPL - Common Portability Library
 * Purpose:  CPL Error handling
 * Author:   Daniel Morissette, danmo@videotron.ca
 *
 **********************************************************************
 * Copyright (c) 1998, Daniel Morissette
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#ifndef CPL_ERROR_H_INCLUDED
#define CPL_ERROR_H_INCLUDED

#include "cpl_port.h"

#include <stdarg.h>
#include <stddef.h>

/*=====================================================================
                   Error handling functions (cpl_error.c)
 =====================================================================*/

/**
 * \file cpl_error.h
 *
 * CPL error handling services.
 */

CPL_C_START

/** Error category */
typedef enum
{
    CE_None = 0,
    CE_Debug = 1,
    CE_Warning = 2,
    CE_Failure = 3,
    CE_Fatal = 4
} CPLErr;

/* ==================================================================== */
/*      Well known error codes.                                         */
/* ==================================================================== */

#ifdef STRICT_CPLERRORNUM_TYPE

/* This is not appropriate for the general case, as there are parts */
/* of GDAL which use custom error codes, but this can help diagnose confusions */
/* between CPLErr and CPLErrorNum */
typedef enum
{
  CPLE_None,
  CPLE_AppDefined,
  CPLE_OutOfMemory,
  CPLE_FileIO,
  CPLE_OpenFailed,
  CPLE_IllegalArg,
  CPLE_NotSupported,
  CPLE_AssertionFailed,
  CPLE_NoWriteAccess,
  CPLE_UserInterrupt,
  CPLE_ObjectNull,
  CPLE_HttpResponse,
  CPLE_AWSBucketNotFound,
  CPLE_AWSObjectNotFound,
  CPLE_AWSAccessDenied,
  CPLE_AWSInvalidCredentials,
  CPLE_AWSSignatureDoesNotMatch,
} CPLErrorNum;

#else

/** Error number */
typedef int CPLErrorNum;

/** No error */
#define CPLE_None                       0
/** Application defined error */
#define CPLE_AppDefined                 1
/** Out of memory error */
#define CPLE_OutOfMemory                2
/** File I/O error */
#define CPLE_FileIO                     3
/** Open failed */
#define CPLE_OpenFailed                 4
/** Illegal argument */
#define CPLE_IllegalArg                 5
/** Not supported */
#define CPLE_NotSupported               6
/** Assertion failed */
#define CPLE_AssertionFailed            7
/** No write access */
#define CPLE_NoWriteAccess              8
/** User interrupted */
#define CPLE_UserInterrupt              9
/** NULL object */
#define CPLE_ObjectNull                 10

/*
 * Filesystem-specific errors
 */
/** HTTP response */
#define CPLE_HttpResponse               11
/** AWSBucketNotFound */
#define CPLE_AWSBucketNotFound          12
/** AWSObjectNotFound */
#define CPLE_AWSObjectNotFound          13
/** AWSAccessDenied */
#define CPLE_AWSAccessDenied            14
/** AWSInvalidCredentials */
#define CPLE_AWSInvalidCredentials      15
/** AWSSignatureDoesNotMatch */
#define CPLE_AWSSignatureDoesNotMatch   16
/** VSIE_AWSError */
#define CPLE_AWSError                   17

/* 100 - 299 reserved for GDAL */

#endif

void CPL_DLL CPLError(CPLErr eErrClass, CPLErrorNum err_no, CPL_FORMAT_STRING(const char *fmt), ...)  CPL_PRINT_FUNC_FORMAT (3, 4);
void CPL_DLL CPLErrorV(CPLErr, CPLErrorNum, const char *, va_list );
void CPL_DLL CPLEmergencyError( const char * ) CPL_NO_RETURN;
void CPL_DLL CPL_STDCALL CPLErrorReset( void );
CPLErrorNum CPL_DLL CPL_STDCALL CPLGetLastErrorNo( void );
CPLErr CPL_DLL CPL_STDCALL CPLGetLastErrorType( void );
const char CPL_DLL * CPL_STDCALL CPLGetLastErrorMsg( void );
GUInt32 CPL_DLL CPL_STDCALL CPLGetErrorCounter( void );
void CPL_DLL * CPL_STDCALL CPLGetErrorHandlerUserData(void);
void CPL_DLL CPLErrorSetState( CPLErr eErrClass, CPLErrorNum err_no, const char* pszMsg );
/*! @cond Doxygen_Suppress */
void CPL_DLL CPLCleanupErrorMutex( void );
/*! @endcond */

/** Callback for a custom error handler */
typedef void (CPL_STDCALL *CPLErrorHandler)(CPLErr, CPLErrorNum, const char*);

void CPL_DLL CPL_STDCALL CPLLoggingErrorHandler( CPLErr, CPLErrorNum, const char * );
void CPL_DLL CPL_STDCALL CPLDefaultErrorHandler( CPLErr, CPLErrorNum, const char * );
void CPL_DLL CPL_STDCALL CPLQuietErrorHandler( CPLErr, CPLErrorNum, const char * );
void CPLTurnFailureIntoWarning( int bOn );

CPLErrorHandler CPL_DLL CPL_STDCALL CPLSetErrorHandler( CPLErrorHandler );
CPLErrorHandler CPL_DLL CPL_STDCALL CPLSetErrorHandlerEx( CPLErrorHandler, void* );
void CPL_DLL CPL_STDCALL CPLPushErrorHandler( CPLErrorHandler );
void CPL_DLL CPL_STDCALL CPLPushErrorHandlerEx( CPLErrorHandler, void* );
void CPL_DLL CPL_STDCALL CPLSetCurrentErrorHandlerCatchDebug( int bCatchDebug );
void CPL_DLL CPL_STDCALL CPLPopErrorHandler(void);

#ifdef WITHOUT_CPLDEBUG
#define CPLDebug(...)  /* Eat all CPLDebug calls. */
#else
void CPL_DLL CPLDebug(const char *, CPL_FORMAT_STRING(const char *), ...)
    CPL_PRINT_FUNC_FORMAT(2, 3);
#endif

#ifdef DEBUG
/** Same as CPLDebug(), but expands to nothing for non-DEBUG builds.
 * @since GDAL 3.1
 */
#define CPLDebugOnly(...) CPLDebug(__VA_ARGS__)
#else
/** Same as CPLDebug(), but expands to nothing for non-DEBUG builds.
 * @since GDAL 3.1
 */
#define CPLDebugOnly(...)
#endif

void CPL_DLL CPL_STDCALL _CPLAssert( const char *, const char *, int ) CPL_NO_RETURN;

#if defined(DEBUG) && !defined(CPPCHECK)
/** Assert on an expression. Only enabled in DEBUG mode */
#  define CPLAssert(expr)  ((expr) ? (void)(0) : _CPLAssert(#expr,__FILE__,__LINE__))
/** Assert on an expression in DEBUG mode. Evaluate it also in non-DEBUG mode (useful to 'consume' a error return variable) */
#  define CPLAssertAlwaysEval(expr) CPLAssert(expr)
#else
/** Assert on an expression. Only enabled in DEBUG mode */
#  define CPLAssert(expr)
#ifdef __cplusplus
/** Assert on an expression in DEBUG mode. Evaluate it also in non-DEBUG mode (useful to 'consume' a error return variable) */
#  define CPLAssertAlwaysEval(expr) CPL_IGNORE_RET_VAL(expr)
#else
/** Assert on an expression in DEBUG mode. Evaluate it also in non-DEBUG mode (useful to 'consume' a error return variable) */
#  define CPLAssertAlwaysEval(expr) (void)(expr)
#endif
#endif

CPL_C_END

/*! @cond Doxygen_Suppress */
/*
 * Helper macros used for input parameters validation.
 */
#ifdef DEBUG
#  define VALIDATE_POINTER_ERR CE_Fatal
#else
#  define VALIDATE_POINTER_ERR CE_Failure
#endif


#if defined(__cplusplus) && !defined(CPL_SUPRESS_CPLUSPLUS) && !defined(DOXYGEN_SKIP)

extern "C++"
{
template<class T> T* CPLAssertNotNull(T* x) CPL_RETURNS_NONNULL;
template<class T> T* CPLAssertNotNull(T* x) { CPLAssert(x); return x; }

#include <string>

class CPLErrorHandlerPusher
{
    public:
        explicit CPLErrorHandlerPusher(CPLErrorHandler hHandler)
        {
            CPLPushErrorHandler(hHandler);
        }

        CPLErrorHandlerPusher(CPLErrorHandler hHandler, void* user_data)
        {
            CPLPushErrorHandlerEx(hHandler, user_data);
        }

        ~CPLErrorHandlerPusher()
        {
            CPLPopErrorHandler();
        }
};

class CPLErrorStateBackuper
{
        CPLErrorNum m_nLastErrorNum;
        CPLErr      m_nLastErrorType;
        std::string m_osLastErrorMsg;

    public:
        CPLErrorStateBackuper() :
            m_nLastErrorNum(CPLGetLastErrorNo()),
            m_nLastErrorType(CPLGetLastErrorType()),
            m_osLastErrorMsg(CPLGetLastErrorMsg())
        {}

        ~CPLErrorStateBackuper()
        {
            CPLErrorSetState(m_nLastErrorType, m_nLastErrorNum,
                             m_osLastErrorMsg.c_str());
        }
};

}

#ifdef GDAL_COMPILATION
// internal only
bool CPLIsDefaultErrorHandlerAndCatchDebug();
#endif

#endif

/*! @endcond */

/** Validate that a pointer is not NULL */
#define VALIDATE_POINTER0(ptr, func) \
   do { if( CPL_NULLPTR == ptr ) \
      { \
        CPLErr const ret = VALIDATE_POINTER_ERR; \
        CPLError( ret, CPLE_ObjectNull, \
           "Pointer \'%s\' is NULL in \'%s\'.\n", #ptr, (func)); \
         return; }} while(0)

/** Validate that a pointer is not NULL, and return rc if it is NULL */
#define VALIDATE_POINTER1(ptr, func, rc) \
   do { if( CPL_NULLPTR == ptr ) \
      { \
          CPLErr const ret = VALIDATE_POINTER_ERR; \
          CPLError( ret, CPLE_ObjectNull, \
           "Pointer \'%s\' is NULL in \'%s\'.\n", #ptr, (func)); \
        return (rc); }} while(0)

#endif /* CPL_ERROR_H_INCLUDED */