{
    //
    // Parity options and settable bits from winbase.h
    //
    switch (dwParity) {
    case NOPARITY:      if (dwSettableParity & PARITY_NONE) return TRUE; break;
    case ODDPARITY:     if (dwSettableParity & PARITY_ODD)  return TRUE; break;
    case EVENPARITY:    if (dwSettableParity & PARITY_EVEN) return TRUE; break;
    case MARKPARITY:    if (dwSettableParity & PARITY_MARK) return TRUE; break;
    case SPACEPARITY:   if (dwSettableParity & PARITY_SPACE)return TRUE; break;
    }
    return FALSE;
}   // IsValidParity


BOOL
IsValidStopBits(
    DWORD dwStopBits,
    DWORD dwSettableStopBits
    )
{
    //
    // Stop bit values and settable bits from winbase.h
    //
    switch (dwStopBits) {
    case ONESTOPBIT:    if (dwSettableStopBits & STOPBITS_10) return TRUE; break;
    case ONE5STOPBITS:  if (dwSettableStopBits & STOPBITS_15) return TRUE; break;
    case TWOSTOPBITS:   if (dwSettableStopBits & STOPBITS_20) return TRUE; break;
    }
    return FALSE;
}   // IsValidStopBits


BOOL
IsBadStringPtr(
    LPCWSTR lpStr,
    DWORD dwMaxLen
    )
{
    DWORD len;
    BOOL bRet;

    bRet = FALSE;

    try {
        len = wcslen(lpStr);
    } except (EXCEPTION_EXECUTE_HANDLER) {
        DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:IsBadStringPtr: Exception!\n")));        
        bRet = TRUE;
    }
    if (bRet) {
        if (len > dwMaxLen) {
            DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:IsBadStringPtr: String too long %d > %d\n"), len, dwMaxLen));
            bRet = TRUE;
        }
    }
    return bRet;
}   // IsBadStringPtr

//
// Function to edit the specific property of a PDEVMINICONFIG
//
LONG
DevSpecificLineConfigEdit(
    PTLINEDEV   pLineDev,
    PUNIMDM_CHG_DEVCFG pChg
    )
{
    DWORD dwSettableBaud;
    DWORD dwSettableData;
    DWORD dwSettableStopParity;
    DWORD rc;

    PDEVMINICFG  pDevMiniCfg;
    LPVARSTRING  lpDevConfig;
    LPWSTR lpszDeviceClass;
    LPWSTR lpszDialModifier;

    DEBUGMSG(ZONE_FUNC, (TEXT("UNIMODEM:+DevSpecificLineConfigEdit\n")));

    if (IsBadReadPtr(pChg, sizeof(UNIMDM_CHG_DEVCFG))) {
        DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: Invalid PUNIMDM_CHG_DEVCFG\n")));
        rc = LINEERR_INVALPOINTER;
        goto exitPoint;
    }

    lpszDeviceClass = (LPWSTR)MapPtrToProcess((LPVOID)pChg->lpszDeviceClass, GetCallerProcess());

    if (!ValidateDevCfgClass(lpszDeviceClass)) {
        DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: LINEERR_INVALDEVICECLASS\n")));
        rc = LINEERR_INVALDEVICECLASS;
        goto exitPoint;
    }
    
    //
    // Validate the buffer pointers
    //
    if (pChg->lpDevConfig == NULL) {
        DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: LINEERR_INVALPOINTER\n")));
        rc = LINEERR_INVALPOINTER;
        goto exitPoint;
    }

    lpDevConfig = (LPVARSTRING)MapPtrToProcess((LPVOID)pChg->lpDevConfig, GetCallerProcess());
    pDevMiniCfg = (PDEVMINICFG)(((LPBYTE)lpDevConfig) + sizeof(VARSTRING));

    //
    // Validate the buffer size
    //
    if (lpDevConfig->dwTotalSize < sizeof(VARSTRING) + sizeof(DEVMINICFG)) {
        DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: LINEERR_STRUCTURETOOSMALL\n")));
        lpDevConfig->dwNeededSize = sizeof(VARSTRING) + sizeof(DEVMINICFG);
        rc = LINEERR_STRUCTURETOOSMALL;
        goto exitPoint;
    }

    lpDevConfig->dwNeededSize = sizeof(VARSTRING) + sizeof(DEVMINICFG);
    lpDevConfig->dwUsedSize   = sizeof(VARSTRING) + sizeof(DEVMINICFG);
    
    //
    // If they specify version 0, then they want the default devconfig. 
    //
    if (pDevMiniCfg->wVersion == 0) {
        getDefaultDevConfig( pLineDev, pDevMiniCfg );        
    }
    
    rc =  LINEERR_INVALPARAM;

    if (pLineDev->DevMiniCfg.wVersion != (pDevMiniCfg->wVersion)) {
        DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: Invalid DevConfig\n")));
        goto exitPoint;
    }

    switch (pChg->dwOption) {
    case UNIMDM_OPT_BAUDRATE:
    case UNIMDM_OPT_BYTESIZE:
    case UNIMDM_OPT_PARITY:
    case UNIMDM_OPT_STOPBITS:
        dwSettableData = dwSettableStopParity = 0;

        GetSettableFields(
            pLineDev,
            &dwSettableBaud,
            (WORD *)&dwSettableData,
            (WORD *)&dwSettableStopParity
            );
    }

    switch (pChg->dwOption) {
    case UNIMDM_OPT_BAUDRATE:
        if (IsValidBaudRate(pChg->dwValue, dwSettableBaud)) {
            pDevMiniCfg->dwBaudRate = pChg->dwValue;
        } else {
            DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: Unsupported baud rate\n")));
            goto exitPoint;
        }
        break;

    case UNIMDM_OPT_BYTESIZE:
        if (IsValidByteSize(pChg->dwValue, dwSettableData)) {
            pDevMiniCfg->ByteSize = (BYTE)pChg->dwValue;
        } else {
            DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: Unsupported byte size\n")));
            goto exitPoint;
        }
        break;

    case UNIMDM_OPT_PARITY:
        if (IsValidParity(pChg->dwValue, dwSettableStopParity)) {
            pDevMiniCfg->Parity = (BYTE)pChg->dwValue;
        } else {
            DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: Unsupported parity\n")));
            goto exitPoint;
        }
        break;

    case UNIMDM_OPT_STOPBITS:
        if (IsValidStopBits(pChg->dwValue, dwSettableStopParity)) {
            pDevMiniCfg->StopBits = (BYTE)pChg->dwValue;
        } else {
            DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: Unsupported stop bits\n")));
            goto exitPoint;
        }
        break;

    case UNIMDM_OPT_WAITBONG:
        pDevMiniCfg->wWaitBong = (WORD)pChg->dwValue;
        break;

    case UNIMDM_OPT_MDMOPTIONS: // MDM_* values from mcx.h
        //
        // Currently CE unimodem only looks at:
        // MDM_BLIND_DIAL
        // MDM_FLOWCONTROL_HARD
        // MDM_FLOWCONTROL_SOFT
        // MDM_SPEED_ADJUST (enables DCC client automatic baud rate detection)
        //
        if (pChg->dwValue > (MDM_V23_OVERRIDE * 2 - 1)) {
            DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: Invalid modem option\n")));
            goto exitPoint;
        }
        pDevMiniCfg->dwModemOptions = pChg->dwValue;
        break;

    case UNIMDM_OPT_TIMEOUT:
        pDevMiniCfg->dwCallSetupFailTimer = pChg->dwValue;
        break;

    case UNIMDM_OPT_TERMOPTIONS:    // NETUI_LCD_TRMOPT_* values from netui.h
        if (pChg->dwValue == 0) {
            pDevMiniCfg->fwOptions = TERMINAL_NONE;
        } else {
            pDevMiniCfg->fwOptions = 0;
            if (pChg->dwValue & NETUI_LCD_TRMOPT_MANUAL_DIAL) {
                pDevMiniCfg->fwOptions |= MANUAL_DIAL;
            }
            if (pChg->dwValue & NETUI_LCD_TRMOPT_PRE_DIAL) {
                pDevMiniCfg->fwOptions |= TERMINAL_PRE;
            }
            if (pChg->dwValue & NETUI_LCD_TRMOPT_POST_DIAL) {
                pDevMiniCfg->fwOptions |= TERMINAL_POST;
            }
        }
        break;

    case UNIMDM_OPT_DIALMOD:
        lpszDialModifier = (LPWSTR)MapPtrToProcess((LPVOID)pChg->dwValue, GetCallerProcess());
        if (IsBadStringPtr(lpszDialModifier, DIAL_MODIFIER_LEN)) {
            DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: Invalid dial modifier\n")));
            goto exitPoint;
        }
        wcscpy(pDevMiniCfg->szDialModifier, lpszDialModifier);
        break;
        
    default:
        DEBUGMSG(ZONE_ERROR, (TEXT("UNIMODEM:DevSpecificLineConfigEdit: Invalid dwOption\n")));
        goto exitPoint;
    }
    
    rc = 0;

exitPoint:
    DEBUGMSG(ZONE_FUNC, (TEXT("UNIMODEM:-DevSpecificLineConfigEdit: returning 0x%x\n"), rc));
    return rc;
}