This section describes how to use the CST-Clear model to generate the clear subprogram for your model. The clear subprogram resets variables in the model PDA.
This section covers the following topics:
After defining the model PDA, use the CST-Clear model to generate the clear subprogram for your model. The clear subprogram resets the #PDA-USER-AREA variables in the model PDA. If the #PDA-USER-AREA alphanumeric field is redefined into a non-alphanumeric field that does not contain data according to the specified format, an abnormal termination may occur when it is used. To avoid this, the clear subprogram can reset redefined non-alphanumeric fields. Only non-alphanumeric variables are reset. The clear subprogram can also assign initial default values for user parameters.
The CST-Clear model assumes that your model PDA has the RESET-STRUCTURE group level name. For example:
*
* User defined parameter area
2 #PDA-USER-AREA A 100 (1:40)
R 2 #PDA-USER-AREA /* REDEF. BEGIN : #PDA-USER-AREA
3 RESET-STRUCTURE
* |
Note:
A model PDA generated by the CST-PDA model contains the
RESET-STRUCTURE field.
If you do not specify a clear subprogram, the Clear Edit Buffer function on the Generation main menu sets the #PDA-USER-AREA field to blanks. The edit buffer is always cleared, regardless of whether the model uses a clear subprogram.
The nucleus invokes the clear subprogram in the following situations:
When a user invokes the Clear Edit Buffer function on the Generation main menu.
When a user changes the model name and the new model uses a different PDA.
Immediately before the Read Specifications function is invoked on the Generation main menu.
Note:
For an example of a generated clear subprogram, refer to CUMNC in the
SYSCST library.
Use the CST-Clear model to generate the clear subprogram. This model has one specification panel, Standard Parameters.
CUGCMA CST-Clear Subprogram CUG-MA0
Aug 17 Standard Parameters 1 of 1
Module name ........ CXMNC___
Parameter data area CXMNPDA_ *
Title .............. Clear ...________________
Description ........ Clear specification Parameters ..._____________________
_______________________________________________________
_______________________________________________________
_______________________________________________________
Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
main help retrn quit userX main |
The input fields on the Standard Parameters panel are:
| Field | Description |
|---|---|
| Module name | Name specified on the Generation main menu. The
name of the clear subprogram must be alphanumeric and no more than eight
characters in length. Use the following naming convention:
CXxxC where xx uniquely identifies your model. |
| Parameter data area | Name of the parameter data area (PDA) for your
model. Natural Construct determines the name of the
PDA based on the Module name specified on the Generation main menu.
For example, if you entered CXMNC as the name of the clear subprogram, Natural Construct assumes the name of the PDA is CXMNPDA. Use the following naming convention: CXxxPDA where xx uniquely identifies your model. |
| Title | Title for the generated subprogram. The title identifies the subprogram for the List Generated Modules function on the Generation main menu and is used internally for program documentation. |
| Description | Brief description of the subprogram. The description is inserted in the banner at the beginning of the subprogram and is used internally for program documentation. |
CSGSAMPL CST-Clear Subprogram CSGSM0
Aug 17 User Exits 1 of 1
User Exits Exists Sample Required Conditional
-------------------------------- -------- ---------- -------- ----------
_ CHANGE-HISTORY Subprogram
_ PARAMETER-DATA
_ LOCAL-DATA
_ PROVIDE-DEFAULT-VALUES Subprogram
_ BEFORE-CHECK-ERROR Example
_ ADDITIONAL-INITIALIZATIONS Example
_ END-OF-PROGRAM |
For information about these user exits, see Supplied User Exits. For information about using the User Exit editor, refer to User Exit Editor, Natural Construct Generation.
