wxWidgets/src/iodbc/herr.c

/** Error stack management functions
  
    Copyright (C) 1995 by Ke Jin <kejin@empress.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 of the License, 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.
**/

#include	<../iodbc/iodbc.h>

#include	<../iodbc/isql.h>
#include	<../iodbc/isqlext.h>

#include        <../iodbc/dlproc.h>

#include        <../iodbc/herr.h>
#include	<../iodbc/henv.h>
#include	<../iodbc/hdbc.h>
#include	<../iodbc/hstmt.h>

#include	<../iodbc/itrace.h>

#include	"../iodbc/herr.ci"
#include        <strings.h>
#include        <stdio.h>

static	HERR	_iodbcdm_popsqlerr( HERR herr )
{
	sqlerr_t*	list = (sqlerr_t*)herr;
	sqlerr_t*	next;

	if( herr == SQL_NULL_HERR )
	{
		return herr;
	}
	
	next = list->next;

	MEM_FREE (list);

	return next;
}

void	_iodbcdm_freesqlerrlist( HERR herrlist )
{
	HERR	list;

	for(list = herrlist; list!= 0; )
	{
		list = _iodbcdm_popsqlerr(list);
	}
}

HERR	_iodbcdm_pushsqlerr ( 
		HERR 		herr,
		sqlstcode_t	code,
		char*		msg )
{
	sqlerr_t*	ebuf;
	sqlerr_t*	perr 	= (sqlerr_t*)herr;
	int		idx 	= 0;

	if(herr != SQL_NULL_HERR )
	{
		idx = perr->idx + 1;
	}

	if( idx == 64 )		
	/* over wirte the top entry to prevent error stack blow out */
	{
		perr->code = code;
		perr->msg  = msg;

		return herr;
	}

	ebuf = (sqlerr_t*)MEM_ALLOC (sizeof(sqlerr_t)); 
	
	if( ebuf == NULL )
	{
		return NULL;
	}

	ebuf->msg	= msg;	
	ebuf->code 	= code;
	ebuf->idx	= idx;
	ebuf->next	= (sqlerr_t*)herr;

	return (HERR)ebuf;
}

static	char FAR*	_iodbcdm_getsqlstate ( 
				HERR		herr, 
				void FAR*	tab )
{
	sqlerr_t*	perr = (sqlerr_t*)herr;
	sqlerrmsg_t*	ptr;

	if( herr == SQL_NULL_HERR || tab == NULL )
	{
		return (char FAR*)NULL;
	}

	for( ptr = tab;
	     ptr->code != en_sqlstat_total;
	     ptr++ )
	{
		if(ptr->code == perr->code)
		{
			return (char FAR*)(ptr->stat);
		}
	}

	return (char FAR*)NULL;
}

static char FAR*   	_iodbcdm_getsqlerrmsg(
				HERR		herr,
				void FAR*	errtab )
{
        sqlerr_t*       perr = (sqlerr_t*)herr;
	sqlerrmsg_t*	ptr;

        if( herr == SQL_NULL_HERR )
        {
                return NULL;
        }

	if( perr->msg == NULL && errtab == NULL )
	{
		return NULL;
	}

	if( perr->msg != NULL )
	{
		return perr->msg;
	}

	for( ptr = (sqlerrmsg_t*)errtab;
	     ptr->code != en_sqlstat_total;
	     ptr++ )
	{
		if( ptr->code == perr->code )
		{
			return (char FAR*)ptr->msg;
		}
	}

	return (char FAR*)NULL;
}

RETCODE SQL_API	SQLError (
 			HENV		henv,
			HDBC		hdbc,
			HSTMT		hstmt,
			UCHAR FAR*	szSqlstate,
			SDWORD FAR*	pfNativeError,
			UCHAR FAR*	szErrorMsg,
			SWORD		cbErrorMsgMax,
			SWORD FAR*	pcbErrorMsg )
{
	GENV_t FAR*	genv  	= (GENV_t FAR*) henv;
	DBC_t  FAR*     pdbc    = (DBC_t FAR*) hdbc;
	STMT_t FAR*     pstmt   = (STMT_t FAR*)hstmt;
	HDBC		thdbc;

	HENV		dhenv	= SQL_NULL_HENV;
	HDBC		dhdbc	= SQL_NULL_HDBC;
	HSTMT		dhstmt	= SQL_NULL_HSTMT;

	HERR		herr 	= SQL_NULL_HERR;
	HPROC		hproc	= SQL_NULL_HPROC;

	char   FAR*	errmsg	= NULL;
	char   FAR*	ststr	= NULL;

	int		handle	= 0;
	RETCODE		retcode = SQL_SUCCESS;
	
	if( hstmt != SQL_NULL_HSTMT )	/* retrive stmt err */
	{
		herr 	= pstmt->herr;
		thdbc	= pstmt->hdbc;

		if( thdbc == SQL_NULL_HDBC )
		{
			return SQL_INVALID_HANDLE;
		}	
		hproc	= _iodbcdm_getproc( thdbc, en_Error );
		dhstmt	= pstmt->dhstmt;
		handle	= 3;
	}
	else if( hdbc != SQL_NULL_HDBC )	/* retrive dbc err */
	{
		herr	= pdbc->herr;
		thdbc	= hdbc;
		if( thdbc == SQL_NULL_HDBC )
		{
			return SQL_INVALID_HANDLE;
		}
		hproc	= _iodbcdm_getproc( thdbc, en_Error );
		dhdbc	= pdbc->dhdbc;
		handle	= 2;

		if( herr == SQL_NULL_HERR
		 && pdbc->henv == SQL_NULL_HENV )
		{
			return SQL_NO_DATA_FOUND;
		}
	}
	else if( henv != SQL_NULL_HENV )	/* retrive env err */
	{
		herr	= genv->herr;

		/* Drivers shouldn't push error message 
		 * on envoriment handle */

		if( herr == SQL_NULL_HERR )
		{
			return SQL_NO_DATA_FOUND;
		}

		handle = 1;
	}
	else
	{
		return SQL_INVALID_HANDLE;
	}

	if( szErrorMsg != NULL )
	{
		if( cbErrorMsgMax < 0
		 || cbErrorMsgMax > SQL_MAX_MESSAGE_LENGTH - 1 )
		{
			return SQL_ERROR;
			/* SQLError() doesn't post error for itself */
		}
	}

	if( herr == SQL_NULL_HERR )		/* no err on drv mng */
	{
		/* call driver */
		if( hproc == SQL_NULL_HPROC )
		{
			PUSHSQLERR ( herr, en_IM001 );

			return SQL_ERROR;
		}

		CALL_DRIVER ( thdbc, retcode, hproc, en_Error, (
				dhenv, dhdbc, dhstmt, 
				szSqlstate, pfNativeError, 
				szErrorMsg, cbErrorMsgMax, pcbErrorMsg) )

#if 0
		retcode = hproc(dhenv, dhdbc, dhstmt, 
				szSqlstate, pfNativeError, 
				szErrorMsg, cbErrorMsgMax, pcbErrorMsg);
#endif

		return retcode;
	}

	if( szSqlstate != NULL )
	{
		int	len;

		/* get sql state  string */
		ststr = (char FAR*)_iodbcdm_getsqlstate( herr, 
				(void FAR*)sqlerrmsg_tab );
	
		if( ststr == NULL)
		{
			len = 0;
		}
		else
		{
			len = (int)STRLEN(ststr);
		}
	
		STRNCPY ( szSqlstate, ststr, len );
		szSqlstate[len] = 0;
		/* buffer size of szSqlstate is not checked. Applications
		 * suppose provide enough ( not less than 6 bytes ) buffer
		 * or NULL for it.
		 */
	}

	if( pfNativeError != NULL )
	{
		/* native error code is specific to data source */
		*pfNativeError = (SDWORD)0L;
	}

	if( szErrorMsg == NULL || cbErrorMsgMax == 0 )
	{
		if( pcbErrorMsg != NULL )
		{
			*pcbErrorMsg = (SWORD)0;
		}
	}
	else
	{
		int	len;
		char	msgbuf[256] = { '\0' };

		/* get sql state message */
		errmsg = _iodbcdm_getsqlerrmsg(herr, 
				(void FAR*)sqlerrmsg_tab);

		if(errmsg == NULL)
		{
			errmsg = (char FAR*)"";
		}       

		sprintf(msgbuf, "%s%s", sqlerrhd, errmsg); 
	
		len = STRLEN( msgbuf );

		if( len < cbErrorMsgMax - 1 )
		{
			retcode = SQL_SUCCESS;
		}
		else
		{
			len = cbErrorMsgMax - 1;
			retcode = SQL_SUCCESS_WITH_INFO;
			/* and not posts error for itself */
		}

		STRNCPY((char*)szErrorMsg, msgbuf, len);
		szErrorMsg[len] = 0;

		if( pcbErrorMsg != NULL)
		{
			*pcbErrorMsg = (SWORD)len;
		}
	}

	switch(handle)		/* free this err */
	{
		case 1:
			genv->herr = _iodbcdm_popsqlerr(genv->herr);
			break;

		case 2:
			pdbc->herr = _iodbcdm_popsqlerr(pdbc->herr);
			break;

		case 3: 
			pstmt->herr= _iodbcdm_popsqlerr(pstmt->herr);
			break;

		default:
			break;
	}

	return retcode;
}