Sample DECTPU Procedures

A.2 Translation of Control Characters

Example A–2 (Cont.) Procedure to Display Control Characters

!

!This procedure controls the outer loop search for the special

!control characters that we want to view.

!

PROCEDURE view_controls (source_buffer)

CONSTANT

Ctrl_char_str :=

ASCII (0) + ASCII (1) + ASCII (2) + ASCII (3) +

ASCII (4) + ASCII (5) + ASCII (6) + ASCII (7) +

ASCII (8) + ASCII (9) + ASCII (10) + ASCII (11) +

ASCII (12) + ASCII (13) + ASCII (14) + ASCII (15) +

ASCII (16) + ASCII (17) + ASCII (18) + ASCII (19) +

ASCII (20) + ASCII (21) + ASCII (22) + ASCII (23) +

ASCII (24) + ASCII (25) + ASCII (26) + ASCII (27) +

ASCII (28) + ASCII (29) + ASCII (30) + ASCII (31);

LOCAL

Ctrl_char_pattern,

Ctrl_char_range;

!Create the translation buffer and window, if necessary

IF translate_buffer = TPU$K_UNSPECIFIED THEN

translate_buffer := CREATE_BUFFER ("translation"); SET (NO_WRITE, translate_buffer);

ENDIF;

IF translate_window = TPU$K_UNSPECIFIED THEN

translate_window := CREATE_WINDOW (1, 10, ON);

ENDIF;

!

!Make a copy of the buffer we are translating

ERASE (translate_buffer); POSITION (translate_buffer); COPY_TEXT (source_buffer);

!

!Search for any control characters and translate them. If a control character

!is not found, SEARCH_QUIETLY will return a 0.

!

Ctrl_char_pattern := ANY (Ctrl_char_str); POSITION (BEGINNING_OF (translate_buffer));

(continued on next page)

A–4Sample DECTPU Procedures

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Compaq AA-PWCBD-TE manual Make a copy of the buffer we are translating
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