Compuprint 914 Spécifications télécharger pdf (Page 359)

B-5Calculatin Page Width Using Printer Colon File Escape Sequence

numbered steps correspond to the numbers on the left side of the columns in the figure, and

provide a step–by–step description of the evaluation of the printer colon file escape

sequences defining page width, in characters, for this particular queue (asc), colon file, and

command line.

Figure 7. Calculation of Page Width

1. %Cw – Pushes a 0 onto the stack because the w flag was not used on the command

line.

2. %I_w – Calls for the evaluation of _w.

3. %G_z – Pushes a 1 onto the stack.

4. %{1} – Pushes a 1 onto the stack.

5. %& – Pops the top two values (two 1 s) off the stack, performs a bitwise AND on the two

values, and pushes the resultant 1 onto the stack.

6. %t – Pops the 1 off the stack and, because it is a TRUE (non–zero) value, calls for the

evaluation of %GwK.

7. %GwK – Calls for the evaluation of wK.

8. %G_Q – Calls for the evaluation of _Q.

9. %GwQ – Calls for the evaluation of wQ.

10.%GWu – Calls for the evaluation of Wu.

11.%CO – Pushes a 0 onto the stack because the O flag was not used on the command

line.

12.%t – Pops the 0 off the stack and, because it is a FALSE (zero) value, calls for the

evaluation of %G_u. The stack labeled Wu is now empty.

13.%G_u – Pushes a 1 onto the stack.

14.%d – Pops the 1 off the stack and returns it, in ASCII format, to the in–progress

calculation of wQ.

15.%{0} – Pushes a 0 onto the stack.

16.%= – Pops the 0 and 1 off the stack, compares them for equality, and pushes the

resultant 0 onto the stack.

1 2 ... 354 355 356 357 358 359 360 361 362 363 364 ... 373 374

Pas de commentaire

Compuprint 914 Spécifications Page 359