errsys.prg

/*
 * The default error handler
 *
 * Copyright 1999 Antonio Linares <alinares@fivetech.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file LICENSE.txt.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

#include "error.ch"

PROCEDURE ErrorSys()

   ErrorBlock( {| oError | DefError( oError ) } )

   RETURN

STATIC FUNCTION DefError( oError )

   LOCAL cMessage
   LOCAL cOSError

   LOCAL aOptions
   LOCAL nChoice

   LOCAL n

   // By default, division by zero results in zero
   IF oError:genCode == EG_ZERODIV .AND. ;
      oError:canSubstitute
      RETURN 0
   ENDIF

   // By default, retry on RDD lock error failure
   IF oError:genCode == EG_LOCK .AND. ;
      oError:canRetry
      // oError:tries++
      RETURN .T.
   ENDIF

   // Set NetErr() of there was a database open error
   IF oError:genCode == EG_OPEN .AND. ;
      oError:osCode == 32 .AND. ;
      oError:canDefault
      NetErr( .T. )
      RETURN .F.
   ENDIF

   // Set NetErr() if there was a lock error on dbAppend()
   IF oError:genCode == EG_APPENDLOCK .AND. ;
      oError:canDefault
      NetErr( .T. )
      RETURN .F.
   ENDIF

   cMessage := ErrorMessage( oError )
   IF ! Empty( oError:osCode )
      cOSError := hb_StrFormat( "(DOS Error %1$d)", oError:osCode )
   ENDIF

   // Build buttons

   aOptions := {}

   AAdd( aOptions, "Quit" )

   IF oError:canRetry
      AAdd( aOptions, "Retry" )
   ENDIF

   IF oError:canDefault
      AAdd( aOptions, "Default" )
   ENDIF

   // Show alert box

   DO WHILE ( nChoice := Alert( cMessage + ;
      iif( cOSError == NIL, "", ";" + cOSError ), aOptions ) ) == 0
   ENDDO

   IF ! Empty( nChoice )  /* Alert() may return NIL */
      SWITCH aOptions[ nChoice ]
      CASE "Break"
         Break( oError )
      CASE "Retry"
         RETURN .T.
      CASE "Default"
         RETURN .F.
      ENDSWITCH
   ENDIF

   // "Quit" selected

   IF cOSError != NIL
      cMessage += " " + cOSError
   ENDIF

   OutErr( hb_eol() )
   OutErr( cMessage )

   n := 1
   DO WHILE ! Empty( ProcName( ++n ) )
      OutErr( hb_eol() )
      OutErr( hb_StrFormat( "Called from %1$s(%2$d)  ", ;
         ProcName( n ), ;
         ProcLine( n ) ) )
   ENDDO

   ErrorLevel( 1 )
   QUIT

   RETURN .F.

STATIC FUNCTION ErrorMessage( oError )

   // start error message
   LOCAL cMessage := iif( oError:severity > ES_WARNING, "Error", "Warning" ) + " "

   // add subsystem name if available
   IF HB_ISSTRING( oError:subsystem )
      cMessage += oError:subsystem()
   ELSE
      cMessage += "???"
   ENDIF

   // add subsystem's error code if available
   IF HB_ISNUMERIC( oError:subCode )
      cMessage += "/" + hb_ntos( oError:subCode )
   ELSE
      cMessage += "/???"
   ENDIF

   // add error description if available
   IF HB_ISSTRING( oError:description )
      cMessage += "  " + oError:description
   ENDIF

   // add either filename or operation
   DO CASE
   CASE ! Empty( oError:filename )
      cMessage += ": " + oError:filename
   CASE ! Empty( oError:operation )
      cMessage += ": " + oError:operation
   ENDCASE

   RETURN cMessage