Getting Started with DECTPU 2.6 Using OpenVMS EDIT/TPU Command Qualifiers

Using /NOOUTPUT, you can develop an application that lets you control the output of a file. For example, an application could be coded so that if you specify /NOOUTPUT on the DCL command line, DECTPU would set the NO_WRITE attribute for the main buffer and suppress creation of an output file for that buffer.

2.6.11 /READ_ONLY

/READ_ONLY

/NOREAD_ONLY (default)

The /READ_ONLY qualifier determines whether the application layered on DECTPU creates an output file from the contents of the main buffer if the contents are modified.

The processing of the /READ_ONLY qualifier is interrelated with the processing of the /WRITE qualifier. /READ_ONLY is equivalent to /NOWRITE; /NOREAD_ ONLY is equivalent to /WRITE.

DECTPU signals an error and returns control to DCL if DECTPU encounters either of the following combinations of qualifiers on the DCL command line:

•/READ_ONLY and /WRITE

•/NOREAD_ONLY and /NO_WRITE

The application layered on DECTPU is responsible for processing this qualifier.

To determine whether either the /READ_ONLY or /NOWRITE qualifier was used on the DCL command line, use the following call in an application:

x := GET_INFO (COMMAND_LINE, "read_only");

This statement returns 1 if /READ_ONLY or /NOWRITE was explicitly specified on the command line.

To determine whether either /NOREAD_ONLY or /WRITE was used on the DCL command line, use the following call in an application:

x := GET_INFO (COMMAND_LINE, "write");

This statement returns 1 if /NOREAD_ONLY or /WRITE was explicitly specified on the command line.

If both GET_INFO calls return false, the application is expected to determine the default behavior. For more information on GET_INFO, see the DEC Text Processing Utility Reference Manual.

In EVE, using the /READ_ONLY qualifier is equivalent to using the /NOJOURNAL, /NOMODIFY, and /NOOUTPUT qualifiers. If you specify /READ_ ONLY, DECTPU does not maintain a journal file for your editing session, and the NO_WRITE and NO_MODIFY attributes are set for the main buffer. When a buffer is set to NO_WRITE, the contents of the buffer are not written out upon exit, regardless of whether the session is terminated with the EXIT built-in or the QUIT built-in. For example, if you want to edit a file called MEETING.MEM but not write out the contents when exiting or quitting, use the following command:

$ EDIT/TPU/READ_ONLY meeting.mem

In response to the /NOREAD_ONLY qualifier, EVE writes out the buffer specified on the command line (if the buffer has been modified) when an EXIT command is issued. This is the default behavior.

Getting Started with DECTPU 2–17

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Compaq AA-PWCBD-TE manual 11 /READONLY, $ EDIT/TPU/READONLY meeting.mem
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