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EDT Routines, EDT$EDIT
*Conan The Librarian (sorry for the slow response - running on an old VAX)
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The EDT$EDIT routine invokes the EDT editor.
Format
EDT$EDIT in_file [,out_file] [,com_file] [,jou_file]
[,options] [,fileio] [,workio] [,xlate]
OpenVMS usage:cond_value
type: longword (unsigned)
access: write only
mechanism: by value
Longword condition value. Most utility routines return a
condition value in R0. Condition values that this routine can
return are listed under Condition Values Returned.
in_file
OpenVMS usage:char_string
type: character-coded text string
access: read only
mechanism: by descriptor
File specification of the input file that EDT$EDIT is to edit.
The in_file argument is the address of a descriptor pointing
to this file specification. The string that you enter in this
calling sequence is passed to the FILEIO routine to open the
primary input file. This is the only required argument.
out_file
OpenVMS usage:char_string
type: character-coded text string
access: read only
mechanism: by descriptor
File specification of the output file that EDT$EDIT creates.
The out_file argument is the address of a descriptor pointing
to this file specification. The default is that the input file
specification is passed to the FILEIO routine to open the output
file for the EXIT command.
com_file
OpenVMS usage:char_string
type: character-coded text string
access: read only
mechanism: by descriptor
File specification of the startup command file to be executed
when EDT is invoked. The com_file argument is the address of a
descriptor pointing to this file specification. The com_file
string is passed to the FILEIO routine to open the command file.
The default is the same as that for EDT command file defaults.
jou_file
OpenVMS usage:char_string
type: character-coded text string
access: read only
mechanism: by descriptor
File specification of the journal file to be opened when EDT is
invoked. The jou_file argument is the address of a descriptor
pointing to this file specification. The jou_file string is
passed to the FILEIO routine to open the journal file. The
default is to use the same file name as in_file.
options
OpenVMS usage:mask_longword
type: aligned bit string
access: read only
mechanism: by reference
Bit vector specifying options for the edit operation. The options
argument is the address of an aligned bit string containing this
bit vector. Only bits <5:0> are currently defined; all others
must be 0. The default options have all bits set to 0. This is
the same as the default setting when you invoke EDT to edit a
file from DCL.
Symbols and their descriptions follow:
Symbol Description
EDT$M_RECOVER If set, bit <0> causes EDT to read the journal
file and execute the commands in it, except for
the EXIT or QUIT commands, which are ignored.
After the journal file commands are processed,
editing continues normally. If bit <0> is set,
the FILEIO routine is asked to open the journal
file for both input and output; otherwise FILEIO
is asked only to open the journal file for
output. Bit <0> corresponds to the /RECOVER
qualifier on the EDT command line.
EDT$M_COMMAND If set, bit <1> causes EDT to signal if the
startup command file cannot be opened. When
bit <1> is 0, EDT intercepts the signal
from the FILEIO routine indicating that the
startup command file could not be opened.
Then, EDT proceeds with the editing session
without reading any startup command file.
If no command file name is supplied with
the call to the EDT$EDIT routine, EDT tries
to open SYS$LIBRARY:EDTSYS.EDT or, if that
fails, EDTINI.EDT. Bit <1> corresponds to the
/COMMAND qualifier on the EDT command line. If
EDT$M_NOCOMMAND (bit <4>) is set, bit <1> is
overridden because bit <4> prevents EDT from
trying to open a command file.
EDT$M_ If set, bit <2> prevents EDT from opening
NOJOURNAL the journal file. Bit <2> corresponds to the
/NOJOURNAL or /READ_ONLY qualifier on the EDT
command line.
EDT$M_NOOUTPUT If set, bit <3> prevents EDT from using the
input file name as the default output file name.
Bit <3> corresponds to the /NOOUTPUT or /READ_
ONLY qualifier on the EDT command line.
EDT$M_ If set, bit <4> prevents EDT from opening a
NOCOMMAND startup command file. Bit <4> corresponds to the
/NOCOMMAND qualifier on the EDT command line.
EDT$M_NOCREATE If set, bit <5> causes EDT to return to
the caller if the input file is not found.
The status returned is the error code EDT$_
INPFILNEX.
fileio
OpenVMS usage:vector_longword_unsigned
type: bound procedure value
access: function call
mechanism: by reference
User-supplied routine called by EDT to perform file I/O
functions. The fileio argument is the address of a bound
procedure value containing the user-supplied routine. When you
do not need to intercept any file I/O, either use the entry point
EDT$FILEIO for this argument or omit it. When you only need to
intercept some amount of file I/O, call the EDT$FILEIO routine
for the other cases.
To avoid confusion, note that EDT$FILEIO is a routine provided by
EDT whereas FILEIO is a routine that you provide.
In order to accommodate routines written in high-level languages
that do up-level addressing, this argument must have a data type
of BPV (bound procedure value). BPV is a two-longword entity
in which the first longword contains the address of a procedure
value and the second longword is the environment value. When the
bound procedure is called, EDT loads the second longword into R1.
If you use EDT$FILEIO for this argument, set the second longword
to <0>. You can pass a <0> for the argument, and EDT will set up
EDT$FILEIO as the default and set the environment word to 0.
workio
OpenVMS usage:vector_longword_unsigned
type: bound procedure value
access: function call
mechanism: by reference
User-supplied routine called by EDT to perform I/O between the
work file and EDT. The workio argument is the address of a bound
procedure value containing the user-supplied routine. Work file
records are addressed only by number and are always 512 bytes
long. If you do not need to intercept work file I/O, you can
either use the entry point EDT$WORKIO for this argument or omit
it.
In order to accommodate routines written in high-level languages
that do up-level addressing, this argument must have a data type
of BPV (bound procedure value). This means that EDT loads R1 with
the second longword addressed before calling it. If EDT$WORKIO
is used for this argument, set the second longword to 0. You can
pass a 0 for this argument, and EDT will set up EDT$WORKIO as the
default and set the environment word to 0.
xlate
OpenVMS usage:vector_longword_unsigned
type: bound procedure value
access: function call
mechanism: by reference
User-supplied routine that EDT calls when it encounters the
nokeypad command XLATE. The xlate argument is the address of a
bound procedure value containing the user-supplied routine. The
XLATE routine allows you to gain control of your EDT session. If
you do not need control of EDT during the editing session, you
can either use the entry point EDT$XLATE for this argument or
omit it.
In order to accommodate routines written in high-level languages
that do up-level addressing, this argument must have a data type
of BPV (bound procedure value). This means that EDT loads R1 with
the second longword addressed before calling it. If EDT$XLATE
is used for this argument, set the second longword to 0. You can
pass a 0 for this argument, and EDT will set up EDT$XLATE as the
default and set the environment word to 0.
If the EDT session is terminated by EXIT or QUIT, the status will
be a successful value (bit <0> = 1). If the session is terminated
because the file was not found and if the /NOCREATE qualifier
was in effect, the failure code EDT$_INPFILNEX is returned. In an
unsuccessful termination caused by an EDT error, a failure code
corresponding to that error is returned. Each error status from
the FILEIO and WORKIO routines is explained separately.
Three of the arguments to the EDT$EDIT routine, fileio, workio,
and xlate are the entry point names of user-supplied routines.
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4 - Condition Values Returned
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SS$_NORMAL Normal successful completion.
EDT$_INPFILNEX /NOCREATE specified and input file does not
exist.
This routine also returns any condition values returned by user-
supplied routines.
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