cpl_error.h

Go to the documentation of this file.

/**********************************************************************
 * $Id$
 *
 * Name:     cpl_error.h
 * Project:  CPL - Common Portability Library
 * Purpose:  CPL Error handling
 * Author:   Daniel Morissette, danmo@videotron.ca
 *
 **********************************************************************
 * Copyright (c) 1998, Daniel Morissette
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/
 
#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)
 =====================================================================*/
 
CPL_C_START
 
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
 
typedef int CPLErrorNum;
 
#define CPLE_None 0
#define CPLE_AppDefined 1
#define CPLE_OutOfMemory 2
#define CPLE_FileIO 3
#define CPLE_OpenFailed 4
#define CPLE_IllegalArg 5
#define CPLE_NotSupported 6
#define CPLE_AssertionFailed 7
#define CPLE_NoWriteAccess 8
#define CPLE_UserInterrupt 9
#define CPLE_ObjectNull 10
 
/*
 * Filesystem-specific errors
 */
#define CPLE_HttpResponse 11
#define CPLE_AWSBucketNotFound 12
#define CPLE_AWSObjectNotFound 13
#define CPLE_AWSAccessDenied 14
#define CPLE_AWSInvalidCredentials 15
#define CPLE_AWSSignatureDoesNotMatch 16
#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);
void CPL_DLL CPLCallPreviousHandler(CPLErr eErrClass, CPLErrorNum err_no,
                                    const char *pszMsg);
void CPL_DLL CPLCleanupErrorMutex(void);
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 CPL_DLL CPLTurnFailureIntoWarning(int bOn);
 
CPLErrorHandler CPL_DLL CPLGetErrorHandler(void **ppUserData);
 
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(...)                                                          \
    do                                                                         \
    {                                                                          \
    } while (0) /* Eat all CPLDebug calls. */
#define CPLDebugProgress(...)                                                  \
    do                                                                         \
    {                                                                          \
    } while (0) /* Eat all CPLDebugProgress calls. */
#else
void CPL_DLL CPLDebug(const char *, CPL_FORMAT_STRING(const char *), ...)
    CPL_PRINT_FUNC_FORMAT(2, 3);
void CPL_DLL CPLDebugProgress(const char *, CPL_FORMAT_STRING(const char *),
                              ...) CPL_PRINT_FUNC_FORMAT(2, 3);
#endif
 
#ifdef DEBUG
#define CPLDebugOnly(...) CPLDebug(__VA_ARGS__)
#else
#define CPLDebugOnly(...)                                                      \
    do                                                                         \
    {                                                                          \
    } while (0)
#endif
 
void CPL_DLL CPL_STDCALL _CPLAssert(const char *, const char *,
                                    int) CPL_NO_RETURN;
 
#if defined(DEBUG) && !defined(CPPCHECK)
#define CPLAssert(expr)                                                        \
    ((expr) ? (void)(0) : _CPLAssert(#expr, __FILE__, __LINE__))
#define CPLAssertAlwaysEval(expr) CPLAssert(expr)
#else
#define CPLAssert(expr)                                                        \
    do                                                                         \
    {                                                                          \
    } while (0)
#ifdef __cplusplus
#define CPLAssertAlwaysEval(expr) CPL_IGNORE_RET_VAL(expr)
#else
#define CPLAssertAlwaysEval(expr) (void)(expr)
#endif
#endif
 
CPL_C_END
 
/*
 * 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)
 
extern "C++"
{
    template <class T> T *CPLAssertNotNull(T *x) CPL_RETURNS_NONNULL;
 
    template <class T> T *CPLAssertNotNull(T *x)
    {
        CPLAssert(x);
        return x;
    }
 
#include <memory>
#include <string>
 
    class CPL_DLL CPLErrorHandlerPusher
    {
      public:
        explicit CPLErrorHandlerPusher(CPLErrorHandler hHandler)
        {
            CPLPushErrorHandler(hHandler);
        }
 
        CPLErrorHandlerPusher(CPLErrorHandler hHandler, void *user_data)
        {
            CPLPushErrorHandlerEx(hHandler, user_data);
        }
 
        ~CPLErrorHandlerPusher()
        {
            CPLPopErrorHandler();
        }
    };
 
    class CPL_DLL CPLErrorStateBackuper
    {
        CPLErrorNum m_nLastErrorNum;
        CPLErr m_nLastErrorType;
        std::string m_osLastErrorMsg;
        GUInt32 m_nLastErrorCounter;
        std::unique_ptr<CPLErrorHandlerPusher> m_poErrorHandlerPusher;
 
      public:
        explicit CPLErrorStateBackuper(CPLErrorHandler hHandler = nullptr);
 
        ~CPLErrorStateBackuper();
    };
}
 
#ifdef GDAL_COMPILATION
// internal only
bool CPLIsDefaultErrorHandlerAndCatchDebug();
#endif
 
#endif
 
#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)
 
#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 */