Compaq COBOL
User Manual

Use the CONTROL KEY IN phrase of the ACCEPT statement to tailor your screen-handling programs to give special meanings to any or all of these keys on your terminal:

• Cursor positioning keys (up arrow, down arrow, left arrow, and right arrow keys)
• Program function keys (PF1, PF2, PF3, and PF4)
• Function keys (F6 to F20)
• Keypad keys (if in application keypad mode) 0 to 9, minus (--), comma (,), period (.), ENTER, FIND, INSERT HERE, REMOVE, SELECT, PREV SCREEN, NEXT SCREEN

You can use the CONTROL KEY IN phrase to accept data and to terminate it with a control key or to allow a user to press only a control key (for menu applications).

Table 11-2 lists the characters returned to the data name specified in the CONTROL KEY IN phrase.

Table 11-2 is for VT100 and later series terminals. Depending on your terminal type, certain keys listed in this table are not applicable to your terminal keyboard.

Table 11-2 Compaq COBOL Characters Returned for Cursor Positioning, Program Function, Function, Keypad, and Keyboard Keys

		Characters Returned in the Data Name Specified by CONTROL KEY IN
Key Name	Keypad or Keyboard Name	First1	Remaining (Notes)
Cursor up	up arrow	CSI	A
Cursor down	down arrow	CSI	B
Cursor right	right arrow	CSI	C
Cursor left	left arrow	CSI	D
Program function	PF1	SS3	P
Program function	PF2	SS3	Q
Program function	PF3	SS3	R
Program function	PF4	SS3	S
Keypad	left blank	SS3	P
Keypad	center blank	SS3	Q
Keypad	right blank	SS3	R
Keypad	0	SS3	p
Keypad	1	SS3	q
Keypad	2	SS3	r
Keypad	3	SS3	s
Keypad	4	SS3	t
Keypad	5	SS3	u
Keypad	6	SS3	v
Keypad	7	SS3	w
Keypad	8	SS3	x
Keypad	9	SS3	y
Keypad	-	SS3	m
Keypad	,	SS3	l
Keypad	.	SS3	n
Keypad	ENTER	SS3	M
Keypad	FIND	CSI	1~
Keypad	INSERT HERE	CSI	2~
Keypad	REMOVE	CSI	3~
Keypad	SELECT	CSI	4~
Keypad	PREV SCREEN	CSI	5~
Keypad	NEXT SCREEN	CSI	6~
Tab	Tab	9
Return	Return	13
Function key	HOLD SCREEN	Not Available
Function key	PRINT SCREEN	Not Available
Function key	SET-UP	Not Available
Function key	DATA/TALK	Not Available
Function key	BREAK	Not Available
Function key	F6 2	CSI	17~
Function key	F7	CSI	18~
Function key	F8	CSI	19~
Function key	F9	CSI	20~
Function key	F10	CSI	21~
Function key	F11 (ESC)	CSI	23~
Function key	F12 (BS)	CSI	24~
Function key	F13 (LF)	CSI	25~
Function key	F14	CSI	26~
Function key	F15 (HELP)	CSI	28~
Function key	F16 (DO)	CSI	29~
Function key	F17	CSI	31~
Function key	F18	CSI	32~
Function key	F19	CSI	33~
Function key	F20	CSI	34~
Ctrl/A		1
Ctrl/B		2
Ctrl/C		Not Available
Ctrl/D		4	(on OpenVMS Alpha)
Ctrl/D		Results depend on presence or absence of the AT END phrase in the ACCEPT statement	(on Tru64 UNIX)
Ctrl/E		5
Ctrl/F		6
Ctrl/G		7
Ctrl/H		8
Ctrl/I (Tab)		9
Ctrl/J		10
Ctrl/K		11
Ctrl/L		12
Ctrl/M (Return)		13
Ctrl/N		14
Ctrl/O		Not Available	(on OpenVMS Alpha)
Ctrl/O		15	(on Tru64 UNIX)
Ctrl/P		16
Ctrl/Q		Not Available
Ctrl/R		18
Ctrl/S		Not Available
Ctrl/T		Depends on SET CONTROL Setting	(on OpenVMS Alpha)
Ctrl/T		20	(on Tru64 UNIX)
Ctrl/U		21
Ctrl/V		22
Ctrl/W		23
Ctrl/X		24
Ctrl/Y		Not Available	(on OpenVMS Alpha)
Ctrl/Y		25	(on Tru64 UNIX)
Ctrl/Z		Results depend on presence or absence of the AT END phrase in the ACCEPT statement	(on OpenVMS Alpha)
Ctrl/Z		Not Available	(on Tru64 UNIX)

The definition and value of the CSI and SS3 characters used in Table 11-2 follow:

01 SS3X PIC 9999 COMP VALUE 143. 01 SS3 REDEFINES SS3X PIC X. 01 CSIX PIC 9999 COMP VALUE 155. 01 CSI REDEFINES CSIX PIC X.

Figure 11_10 and Figure 11-11 show the Compaq COBOL control keys for various terminals. The shaded keys correspond to the keypad names in Table 11-2, which lists the characters returned to the application program.

Figure 11-10 Compaq COBOL Control Keys on the Standard VT100 Keypad and Keyboard

Figure 11-11 Compaq COBOL Control Keys on a Typical VT200 or Later Keypad and Keyboard

Example 11-10 shows you how to use the CONTROL KEY phrase to handle arrow keys, program function keys, keypad keys, Ctrl/Z, Tab, and Return.

When you use this phrase, you allow program function keys and arrow keys, as well as Return and Tab keys, to terminate input. This phrase also permits you to use those keys to move the cursor and to make menu selections without typing any data on the screen.

In Example 11-10, the terminator key codes are displayed on the screen.

Example 11-10 Using the CONTROL KEY IN Phrase

IDENTIFICATION DIVISION. PROGRAM-ID. SPECIAL. ENVIRONMENT DIVISION. CONFIGURATION SECTION. SPECIAL-NAMES. SYMBOLIC CHARACTERS CR-VAL CSI-VAL Ctrl-Z-VAL SS3-VAL TAB-VAL ESC ARE 14 156 27 144 10 28. DATA DIVISION. WORKING-STORAGE SECTION. * * The code returned will be the same regardless of * terminal type. * 01 CONTROL-KEY. 02 FIRST-CHAR-CONTROL-KEY PIC X. 88 CR VALUE CR-VAL. 88 CSI VALUE CSI-VAL. 88 Ctrl-Z VALUE Ctrl-Z-VAL. 88 SS3 VALUE SS3-VAL. 88 TAB VALUE TAB-VAL. 02 REMAINING-CHAR-CONTROL-KEY PIC XXXX. 88 UP-ARROW VALUE "A". 88 DOWN-ARROW VALUE "B". 88 RIGHT-ARROW VALUE "C". 88 LEFT-ARROW VALUE "D". 88 PF1 VALUE "P". 88 PF2 VALUE "Q". 88 PF3 VALUE "R". 88 PF4 VALUE "S". 88 AUX0 VALUE "p". 88 AUX1 VALUE "q". 88 AUX2 VALUE "r". 88 AUX3 VALUE "s". 88 AUX4 VALUE "t". 88 AUX5 VALUE "u". 88 AUX6 VALUE "v". 88 AUX7 VALUE "w". 88 AUX8 VALUE "x". 88 AUX9 VALUE "y". 88 AUXMINUS VALUE "m". 88 AUXCOMMA VALUE "l". 88 AUXPERIOD VALUE "n". 88 AUXENTER VALUE "M". PROCEDURE DIVISION. P0. * * DISPLAY ESC "=" puts you in alternate keypad mode * DISPLAY ESC "=". DISPLAY " " ERASE SCREEN. P1. DISPLAY "Press a directional arrow, PF, Return, Tab, " LINE 3 COLUMN 4. DISPLAY "or auxiliary keypad key (Ctrl/Z stops loop)" LINE 4 COLUMN 4. ACCEPT CONTROL KEY IN CONTROL-KEY AT END GO TO P2. IF CR DISPLAY "RETURN" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF TAB DISPLAY "\TAB" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF PF1 DISPLAY "PF1" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF PF2 DISPLAY "PF2" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF PF3 DISPLAY "PF3" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF PF4 DISPLAY "PF4" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF UP-ARROW DISPLAY "UP-ARROW" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF DOWN-ARROW DISPLAY "DOWN-ARROW" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF LEFT-ARROW DISPLAY "LEFT-ARROW" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF RIGHT-ARROW DISPLAY "RIGHT-ARROW" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX0 DISPLAY "AUXILIARY KEYPAD 0" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX1 DISPLAY "AUXILIARY KEYPAD 1" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX2 DISPLAY "AUXILIARY KEYPAD 2" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX3 DISPLAY "AUXILIARY KEYPAD 3" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX4 DISPLAY "AUXILIARY KEYPAD 4" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX5 DISPLAY "AUXILIARY KEYPAD 5" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX6 DISPLAY "AUXILIARY KEYPAD 6" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX7 DISPLAY "AUXILIARY KEYPAD 7" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX8 DISPLAY "AUXILIARY KEYPAD 8" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUX9 DISPLAY "AUXILIARY KEYPAD 9" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUXMINUS DISPLAY "AUXILIARY KEYPAD -" LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUXCOMMA DISPLAY "AUXILIARY KEYPAD ," LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUXPERIOD DISPLAY "AUXILIARY KEYPAD ." LINE 10 COLUMN 5 ERASE LINE GO TO P1. IF AUXENTER DISPLAY "AUXILIARY KEYPAD ENTER" LINE 10 COLUMN 5 ERASE LINE GO TO P1. DISPLAY "Not an allowable control key -" "press the Return key to continue" LINE 10 COLUMN 5 WITH BELL ERASE LINE. ACCEPT CONTROL-KEY. GO TO P1. P2. DISPLAY "Press the Return key to end this job" LINE 11 COLUMN 5 ERASE LINE. ACCEPT CONTROL KEY IN CONTROL-KEY LINE 12 COLUMN 5 ERASE LINE. IF NOT CR GO TO P0 ELSE DISPLAY "END OF JOB" LINE 13 COLUMN 35 BOLD BLINKING REVERSED BELL ERASE SCREEN. P3. * DISPLAY ESC ">" WITH NO puts you out of alternate keypad mode * DISPLAY ESC ">" WITH NO. STOP RUN.

Figure 11_12 shows a sample run of the program in Example 11-10 using the right arrow terminal key.

To expand upon Example 11-10, you can, for example, accept data in addition to specifying the CONTROL KEY phrase. This enables you to accept data and determine what to do next based on the data. You can use the CONTROL KEY phrase to move the cursor around on the screen or take a specific course of action.

Figure 11-12 Screen Display of Program SPECIAL

Specifying the EDITING phrase of the ACCEPT statement enables field editing. Table 11-3 briefly describes the keys that the EDITING phrase enables. Refer to the ACCEPT section of the Compaq COBOL Reference Manual for a complete list of field editing keys.

Table 11-3 Key Functions for the EDITING Phrase

Key	Function	Description
Left arrow	Move-left	Moves the cursor one space to the left. If the cursor is at the first character position of the field, the terminal bell rings.
Right arrow	Move-right	Moves the cursor one space to the right. If the cursor is one space beyond the rightmost character position of the field, the terminal bell rings.
F12 (BS)	Beginning-of-field	Positions the cursor to the first character position of the field.
Ctrl/E	End-of-field	Moves the cursor one position beyond the rightmost character position in the field.
Ctrl/U	Erase-field	Erases the entire field and moves the cursor to the first character position of the field.
F14	Switch-mode	Switches the editing mode between insert and overstrike.

Example 11-11 shows the sample code that produces the form in Figure 11-13. (The Current Value field is provided for example purposes only.)

Example 11-11 EDITING Phrase Sample Code

. . . PROCEDURE DIVISION. A1000-BEGIN. OPEN I-O EMP-FILE. . . . B1000-MODIFY. DISPLAY "MODIFY EMPLOYEE INFORMATION FORM" ERASE SCREEN AT LINE 2 COLUMN 8. DISPLAY "Enter Employee Number : " AT LINE PLUS 2 COLUMN 8. ACCEPT EMP-KEY FROM LINE 4 COLUMN 32 PROTECTED WITH EDITING REVERSED DEFAULT IS CURRENT AT END STOP RUN. . . . B2000-DISPLAY. MOVE EMP-REC TO OUT-REC. DISPLAY "Date of Hire : " AT LINE PLUS 2 COLUMN 8. DISPLAY MON-IN AT COLUMN 24. DISPLAY "-" AT COLUMN 26. DISPLAY DAY-IN AT COLUMN 27. DISPLAY "-" AT COLUMN 29. DISPLAY YR-IN AT COLUMN 30. DISPLAY "Current Value :" AT COLUMN 38. DISPLAY MON-NUM AT COLUMN 54. DISPLAY "-" AT COLUMN 56. DISPLAY DAY-NUM AT COLUMN 57. DISPLAY "-" AT COLUMN 59. DISPLAY YR-NUM AT COLUMN 60. DISPLAY "Department :" AT LINE PLUS 2 COLUMN 8. DISPLAY DEPT-IN AT COLUMN 21. DISPLAY "Current Value :" AT COLUMN 38. DISPLAY DEPT-NUM AT COLUMN PLUS. DISPLAY "First Name :" AT LINE PLUS 2 COLUMN 8. DISPLAY F-NAME-IN AT COLUMN 21. DISPLAY "Current Value :" AT COLUMN 38. DISPLAY F-NAME AT COLUMN PLUS. DISPLAY "Last Name :" AT LINE PLUS 2 COLUMN 8. DISPLAY L-NAME-IN AT COLUMN 20. DISPLAY "Current Value :" AT COLUMN 38. DISPLAY L-NAME AT COLUMN PLUS. ACCEPT MON-NUM FROM LINE 6 COLUMN 24 PROTECTED WITH EDITING REVERSED DEFAULT IS CURRENT AT END STOP RUN. DISPLAY MON-NUM AT LINE 6 COLUMN 54. ACCEPT DAY-NUM FROM LINE 6 COLUMN 27 PROTECTED WITH EDITING REVERSED DEFAULT IS CURRENT AT END STOP RUN. DISPLAY DAY-NUM AT LINE 6 COLUMN 57. ACCEPT YR-NUM FROM LINE 6 COLUMN 30 PROTECTED WITH EDITING REVERSED DEFAULT IS CURRENT AT END STOP RUN. DISPLAY YR-NUM AT LINE 6 COLUMN 60. ACCEPT DEPT-NUM FROM LINE 8 COLUMN 21 PROTECTED WITH EDITING REVERSED DEFAULT IS CURRENT AT END STOP RUN. DISPLAY DEPT-NUM AT LINE 8 COLUMN 54. ACCEPT F-NAME FROM LINE 10 COLUMN 21 PROTECTED WITH EDITING REVERSED DEFAULT IS CURRENT AT END STOP RUN. DISPLAY F-NAME AT LINE 10 COLUMN 54. ACCEPT L-NAME FROM LINE 12 COLUMN 20 PROTECTED WITH EDITING REVERSED DEFAULT IS CURRENT AT END STOP RUN. DISPLAY L-NAME AT LINE 12 COLUMN 54. . . .

Figure 11-13 Form with ACCEPT WITH EDITING Phrase

Because the ACCEPT statements in Example 11-11 contain EDITING phrases, a person using the form in Figure 11-13 can use any of the keys listed in Table 11-3 for field editing purposes to make corrections or modifications.