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PostScript
Guide to Using Page Description Languages 1-19
(\004) cvn {} def %ignore single ^D character
(\032) cvn {} def %ignore single ^Z character
(\004\004) cvn {} def %ignore ^D^D pattern
(\004\032) cvn {} def %ignore ^D^Z pattern
(\032\004) cvn {} def %ignore ^Z^D pattern
(\032\032) cvn {} def %ignore ^Z^Z pattern
(\004\004\004) cvn {} def %ignore ^D^D^D pattern
(\004\004\032) cvn {} def %ignore ^D^D^Z pattern
(\004\032\004) cvn {} def %ignore ^D^Z^D pattern
(\004\032\032) cvn {} def %ignore ^D^Z^Z pattern
(\032\004\004) cvn {} def %ignore ^Z^D^D pattern
(\004\032\004) cvn {} def %ignore ^D^Z^D pattern
(\032\032\004) cvn {} def %ignore ^Z^Z^D pattern
(\032\032\032) cvn {} def %ignore ^Z^Z^Z pattern
%
% The following code redefines PS operators and names
containing control
% characters. Jobs containing the redefined commands will
run without
% the undefined error. Additional lines may be added here as
needed.
%
(\004initgraphics) cvn {initgraphics} def %remove ^D
(initgraphics\004) cvn {initgraphics} def %remove ^D
(showpage\004) cvn {showpage} def %remove ^D
% Examples of case sensitivity.
(sp\004) cvn {sp} def %remove ^D
(Sp\004) cvn {Sp} def %remove ^D
(SP\004) cvn {SP} def %remove ^D
The preceding definitions use the following rules:
•
Isolated illegal characters.
If the illegal characters occur
alone or only with some combination of other illegal
characters, then the resulting token may be redefined as an
empty PostScript procedure, as shown in this example:
(\004) cvn {} def
NOTE: It is not desirable to redefine the token as null
because this would leave a null object on the operand stack.
•
Illegal characters adjacent to legal characters
. If there is
no white space character (as defined in the
PostScript
Language Reference Manual
, second edition) between the
illegal character or characters and legal PostScript
characters, then that combination can be redefined to be the
legal PostScript substring only, as shown in these examples: