CBL_LOCATE_FILE

This routine has two uses. It can be used to expand an environment variable in a file specification, where the environment variable contains a list of several paths. It can also determine whether an OPEN INPUT statement using a particular file specification finds the file in a library file or as a separate disk file.

Syntax:

call "CBL_LOCATE_FILE" using     user-file-spec
                                 user-mode
                                 actual-file-spec
                                 exist-flag
                                 path-flag
                       returning status-code

Parameters:

user-file-spec

Using call prototype (see Key): pic x(n)

Picture: pic x(n).

user-mode

Using call prototype (see Key): cblt-x1-compx

Picture: pic x comp-x.

actual-file-spec

Group item defined as

01 actual-file-spec
   03 buffer-len   cblt-x2-compx   pic x(2) comp-x. 
   03 buffer       pic x(n).       pic x(n).

exist-flag

Using call prototype (see Key): cblt-x1-compx

Picture: pic x comp-x.

path-flag

Using call prototype (see Key): cblt-x1-compx

Picture: pic x comp-x.

status-code

See Library Routines - Key

On Entry:

user-file-spec

Contains the filename specification; this can include an embedded environment variable or library name.

user-mode

Specifies what to do with user-file-spec:

0	Check whether the file exists in a library or as a separate disk file. If `user-file-spec` includes an embedded environment variable, the file is searched for along each path specified in that variable. If the file is found, `actual-file-spec` on exit contains the file specification with the environment variable expanded to the successful path. Otherwise, `actual-file-spec` on exit contains the file specification with the environment variable expanded to the first path it contained.
1	If `user-file-spec` includes an environment variable, `actual-file-spec` on exit contains the file specification with the environment variable expanded to the first path it contained. The file is not searched for.
2	If `user-file-spec` includes an environment variable, `actual-file-spec` on exit contains the file specification with the environment variable expanded to the next path it contained. The file is not searched for. This option should only be used after a successful call with `user-mode` = 1 or 2. See `path-flag` below.
128	As 0, except `user-file-spec` is a null-terminating string. On exit, `actual-file-spec` is also produced as a null-terminating string.
129	As 1, except `user-file-spec` is a null-terminating string. On exit, `actual-file-spec` is also produced as a null-terminating string.
130	As 2, except `user-file-spec` is a null-terminating string. On exit, `actual-file-spec` is also produced as a null-terminating string.

path-flag

If user-mode = 2, this data item should contain the value that was returned in this item from the previous user-mode = 1 or 2 call.

buffer-len

Size of buffer.

On Exit:

buffer

Buffer to contain the resolved file specification, as described under user-mode. If the resolved file specification is larger than the size specified by buffer-len, the contents of buffer remain unchanged and status-code is set accordingly.

exist-flag

If user-mode = 0, this data item on exit shows whether the file specified in user-file-spec exists.

0	File not found or not searched for
1	File was found in a library that was already open
2	File was found in a library specified in `user-file-spec`
3	File was found as a separate disk file

If user-mode is not 0 this data item is always 0 on exit.

path-flag

Shows whether user-file-spec contained an embedded environment variable that has been expanded in actual-file-spec.

0	`actual-file-spec` does not include an expanded environment variable
>0	`actual-file-spec` contains an expanded environment variable

status-code

Return status:

0	Success
1	The environment variable does not exist
2	There is no next path
3	The resolved filename is too large for the buffer
4	Resulting filename is illegal
255	Other error

Comments:

CBL_LOCATE_FILE is not stripe-aware. If you use this routine on a striped file, the routine locates the first stripe only. Therefore, use this routine on an individual stripe only and refer to the stripe by the stripe name. For more information on the use of striped files, refer to File Striping.

Example:

The user-file-spec can take the form:

Standard filename:	path \ `filename.ext`
Embedded environment variable:	$envname \ `filename.ext`
Embedded library name:	path \ `lbr-name.lbr\filename.ext`