cpl_error.cpp

用于读取TAB、MIF、SHP文件的类

/**********************************************************************
 * $Id: cpl_error.cpp,v 1.38 2006/06/30 15:03:49 dron Exp $
 *
 * Name:     cpl_error.cpp
 * Project:  CPL - Common Portability Library
 * Purpose:  Error handling functions.
 * Author:   Daniel Morissette, [e-mail]
 *
 **********************************************************************
 * 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.
 **********************************************************************
 *
 * $Log: cpl_error.cpp,v $
 * Revision 1.38  2006/06/30 15:03:49  dron
 * Avoid warnings on win/64.
 *
 * Revision 1.37  2006/06/29 20:02:40  fwarmerdam
 * Use va_copy when re-using va_args multiple times.  Needed on AMD64 Linux.
 *
 * Revision 1.36  2006/03/07 22:05:32  fwarmerdam
 * fix up docs a bit
 *
 * Revision 1.35  2006/02/27 23:24:13  fwarmerdam
 * Removed printf about growing error buffer.
 *
 * Revision 1.34  2006/02/27 02:40:11  fwarmerdam
 * Dynamically grow error buffer.
 *
 * Revision 1.33  2006/02/19 21:54:34  mloskot
 * [WINCE] Changes related to Windows CE port of CPL. Most changes are #ifdef wrappers.
 *
 * Revision 1.32  2005/07/25 18:09:10  fwarmerdam
 * Made pfnErrorHandler static.
 *
 * Revision 1.31  2005/07/25 17:56:34  fwarmerdam
 * Altered so that CPLSetErrorHandler sets a handler global to all threads, but
 * that the error handler stack takes precidence over it.
 *
 * Revision 1.30  2005/07/08 14:35:56  fwarmerdam
 * restructured to use error context and TLS
 *
 * Revision 1.29  2005/05/23 03:58:51  fwarmerdam
 * make handler stack threadlocal
 *
 * Revision 1.28  2005/04/04 15:23:31  fwarmerdam
 * some functions now CPL_STDCALL
 *
 * Revision 1.27  2003/05/27 20:44:16  warmerda
 * use VSI time services
 * 
 * Revision 1.26  2003/05/08 21:51:14  warmerda
 * added CPL{G,S}etConfigOption() usage
 *
 * Revision 1.25  2003/04/04 14:57:38  dron
 * _vsnprintf() hack moved to the cpl_config.h.vc.
 *
 * Revision 1.24  2003/04/04 14:16:07  dron
 * Use _vsnprintf() in Windows environment.
 */

#include "cpl_error.h"
#include "cpl_vsi.h"
#include "cpl_conv.h"
#include "cpl_multiproc.h"

#if defined(WIN32CE)
#  include "cpl_wince.h"
#  include <wce_stdlib.h>
#endif
 
#define TIMESTAMP_DEBUG

CPL_CVSID("$Id: cpl_error.cpp,v 1.38 2006/06/30 15:03:49 dron Exp $");

static void *hErrorMutex = NULL;
static CPLErrorHandler pfnErrorHandler = CPLDefaultErrorHandler;

#if !defined(HAVE_VSNPRINTF)
#  define DEFAULT_LAST_ERR_MSG_SIZE 20000
#else
#  define DEFAULT_LAST_ERR_MSG_SIZE 500
#endif

typedef struct errHandler
{
    struct errHandler   *psNext;
    CPLErrorHandler     pfnHandler;
} CPLErrorHandlerNode;

typedef struct {
    int     nLastErrNo;
    CPLErr  eLastErrType;
    CPLErrorHandlerNode *psHandlerStack;
    int     nLastErrMsgMax;
    char    szLastErrMsg[DEFAULT_LAST_ERR_MSG_SIZE];
} CPLErrorContext;

/************************************************************************/
/*                         CPLGetErrorContext()                         */
/************************************************************************/

static CPLErrorContext *CPLGetErrorContext()

{
    CPLErrorContext *psCtx = 
        (CPLErrorContext *) CPLGetTLS( CTLS_ERRORCONTEXT );

    if( psCtx == NULL )
    {
        psCtx = (CPLErrorContext *) CPLCalloc(sizeof(CPLErrorContext),1);
        psCtx->eLastErrType = CE_None;
        psCtx->nLastErrMsgMax = sizeof(psCtx->szLastErrMsg);
        CPLSetTLS( CTLS_ERRORCONTEXT, psCtx, TRUE );
    }

    return psCtx;
}


/**********************************************************************
 *                          CPLError()
 **********************************************************************/

/**
 * Report an error.
 *
 * This function reports an error in a manner that can be hooked
 * and reported appropriate by different applications.
 *
 * The effect of this function can be altered by applications by installing
 * a custom error handling using CPLSetErrorHandler().
 *
 * The eErrClass argument can have the value CE_Warning indicating that the
 * message is an informational warning, CE_Failure indicating that the
 * action failed, but that normal recover mechanisms will be used or
 * CE_Fatal meaning that a fatal error has occured, and that CPLError()
 * should not return.  
 *
 * The default behaviour of CPLError() is to report errors to stderr,
 * and to abort() after reporting a CE_Fatal error.  It is expected that
 * some applications will want to supress error reporting, and will want to
 * install a C++ exception, or longjmp() approach to no local fatal error
 * recovery.
 *
 * Regardless of how application error handlers or the default error
 * handler choose to handle an error, the error number, and message will
 * be stored for recovery with CPLGetLastErrorNo() and CPLGetLastErrorMsg().
 *
 * @param eErrClass one of CE_Warning, CE_Failure or CE_Fatal.
 * @param err_no the error number (CPLE_*) from cpl_error.h.
 * @param fmt a printf() style format string.  Any additional arguments
 * will be treated as arguments to fill in this format in a manner
 * similar to printf().
 */

void    CPLError(CPLErr eErrClass, int err_no, const char *fmt, ...)
{
    va_list args;

    /* Expand the error message 
     */
    va_start(args, fmt);
    CPLErrorV( eErrClass, err_no, fmt, args );
    va_end(args);
}

/************************************************************************/
/*                             CPLErrorV()                              */
/************************************************************************/

void    CPLErrorV(CPLErr eErrClass, int err_no, const char *fmt, va_list args )
{
    CPLErrorContext *psCtx = CPLGetErrorContext();

/* -------------------------------------------------------------------- */
/*      Expand the error message                                        */
/* -------------------------------------------------------------------- */
#if defined(HAVE_VSNPRINTF)
    {
        int nPR;
        va_list wrk_args;

#ifdef va_copy
        va_copy( wrk_args, args );
#else
        wrk_args = args;
#endif

        while( ((nPR = vsnprintf( psCtx->szLastErrMsg, 
                                 psCtx->nLastErrMsgMax, fmt, wrk_args )) == -1
                || nPR >= psCtx->nLastErrMsgMax-1)
               && psCtx->nLastErrMsgMax < 1000000 )
        {
#ifdef va_copy
            va_end( wrk_args );
            va_copy( wrk_args, args );
#else
            wrk_args = args;
#endif
            psCtx->nLastErrMsgMax *= 3;
            psCtx = (CPLErrorContext *) 
                CPLRealloc(psCtx, sizeof(CPLErrorContext) - DEFAULT_LAST_ERR_MSG_SIZE + psCtx->nLastErrMsgMax + 1);
            CPLSetTLS( CTLS_ERRORCONTEXT, psCtx, TRUE );
        }

        va_end( wrk_args );
    }
#else
    vsprintf( psCtx->szLastErrMsg, fmt, args);
#endif

/* -------------------------------------------------------------------- */
/*      If the user provided his own error handling function, then      */
/*      call it, otherwise print the error to stderr and return.        */
/* -------------------------------------------------------------------- */
    psCtx->nLastErrNo = err_no;
    psCtx->eLastErrType = eErrClass;

    if( CPLGetConfigOption("CPL_LOG_ERRORS",NULL) != NULL )
        CPLDebug( "CPLError", "%s", psCtx->szLastErrMsg );

/* -------------------------------------------------------------------- */
/*      Invoke the current error handler.                               */
/* -------------------------------------------------------------------- */
    if( psCtx->psHandlerStack != NULL )
    {
        psCtx->psHandlerStack->pfnHandler(eErrClass, err_no, 
                                          psCtx->szLastErrMsg);
    }
    else
    {
        CPLMutexHolderD( &hErrorMutex );
        if( pfnErrorHandler != NULL )
            pfnErrorHandler(eErrClass, err_no, psCtx->szLastErrMsg);
    }

    if( eErrClass == CE_Fatal )
        abort();
}

/************************************************************************/
/*                              CPLDebug()                              */
/************************************************************************/

/**
 * Display a debugging message.
 *
 * The category argument is used in conjunction with the CPL_DEBUG
 * environment variable to establish if the message should be displayed.
 * If the CPL_DEBUG environment variable is not set, no debug messages
 * are emitted (use CPLError(CE_Warning,...) to ensure messages are displayed).
 * If CPL_DEBUG is set, but is an empty string or the word "ON" then all
 * debug messages are shown.  Otherwise only messages whose category appears
 * somewhere within the CPL_DEBUG value are displayed (as determinted by
 * strstr()).
 *
 * Categories are usually an identifier for the subsystem producing the
 * error.  For instance "GDAL" might be used for the GDAL core, and "TIFF"
 * for messages from the TIFF translator.  
 *
 * @param pszCategory name of the debugging message category.
 * @param pszFormat printf() style format string for message to display.
 *        Remaining arguments are assumed to be for format.
 */ 

void CPLDebug( const char * pszCategory, const char * pszFormat, ... )

{
    CPLErrorContext *psCtx = CPLGetErrorContext();
    char        *pszMessage;
    va_list     args;
    const char  *pszDebug = CPLGetConfigOption("CPL_DEBUG",NULL);

#define ERROR_MAX 25000

/* -------------------------------------------------------------------- */
/*      Does this message pass our current criteria?                    */
/* -------------------------------------------------------------------- */
    if( pszDebug == NULL )
        return;

    if( !EQUAL(pszDebug,"ON") && !EQUAL(pszDebug,"") )
    {
        size_t  i, nLen = strlen(pszCategory);

        for( i = 0; pszDebug[i] != '\0'; i++ )
        {
            if( EQUALN(pszCategory,pszDebug+i,nLen) )
                break;
        }

        if( pszDebug[i] == '\0' )
            return;
    }

/* -------------------------------------------------------------------- */
/*    Allocate a block for the error.                                   */
/* -------------------------------------------------------------------- */
    pszMessage = (char *) VSIMalloc( ERROR_MAX );
    if( pszMessage == NULL )
        return;
        
/* -------------------------------------------------------------------- */
/*      Dal -- always log a timestamp as the first part of the line     */
/*      to ensure one is looking at what one should be looking at!      */
/* -------------------------------------------------------------------- */

    pszMessage[0] = '\0';
#ifdef TIMESTAMP_DEBUG
    if( CPLGetConfigOption( "CPL_TIMESTAMP", NULL ) != NULL )
    {
        strcpy( pszMessage, VSICTime( VSITime(NULL) ) );
        
        // On windows anyway, ctime puts a \n at the end, but I'm not 
        // convinced this is standard behaviour, so we'll get rid of it
        // carefully

        if (pszMessage[strlen(pszMessage) -1 ] == '\n')
        {
            pszMessage[strlen(pszMessage) - 1] = 0; // blow it out
        }
        strcat( pszMessage, ": " );
    }
#endif

/* -------------------------------------------------------------------- */
/*      Add the category.                                               */
/* -------------------------------------------------------------------- */
    strcat( pszMessage, pszCategory );
    strcat( pszMessage, ": " );
    
/* -------------------------------------------------------------------- */
/*      Format the application provided portion of the debug message.   */
/* -------------------------------------------------------------------- */
    va_start(args, pszFormat);
#if defined(HAVE_VSNPRINTF)
    vsnprintf(pszMessage+strlen(pszMessage), ERROR_MAX - strlen(pszMessage), 
              pszFormat, args);
#else
    vsprintf(pszMessage+strlen(pszMessage), pszFormat, args);
#endif
    va_end(args);

/* -------------------------------------------------------------------- */
/*      Invoke the current error handler.                               */
/* -------------------------------------------------------------------- */
    if( psCtx->psHandlerStack != NULL )
    {
        psCtx->psHandlerStack->pfnHandler( CE_Debug, CPLE_None, pszMessage );
    }
    else