|
|
Moves a record pointer forward or backward in a file.
I16V I16V
FSPACE (filenum, displacement);
- filenum
16-bit signed integer by value (required)
Passes the file number of the file on which spacing is to be
done.
- displacement
16-bit signed integer by value (required)
Passes the number of logical records to be spaced over, relative to the
current position of the logical record pointer.
A positive value signifies forward spacing, a negative value signifies
backward spacing. The maximum positive value is 32,767. The maximum
negative value is -32,768.
The logical record pointer is repositioned in key sequence.
The spacing is based on the primary key unless an alternate key
has been specified in a prior call to FFINDN, FFINDBYKEY, or
FREADBYKEY.This intrinsic reads the advance flag and advances
to the next record if the flag is set to TRUE. It sets the logical record
pointer and the physical pointer to the appropriate record. When
its function is completed, it sets the advance flag to FALSE.
Note that because this intrinsic reads the advance flag, spacing might be
affected by a preceding call to an FREAD or FREADC intrinsic.
FREAD and FREADC set the advance flag to TRUE. If the
FSPACE intrinsic is then called, it advances one record before moving
back or ahead the specified number of records.
- CCE
Request granted.
- CCG
Request denied. A logical end-of-file indicator
was encountered during spacing. The logical record pointer is at
the beginning-of-file if displacement was negative or at the end-of-file
if displacement was positive.
- CCL
Request denied. An error occurred.
Refer to this intrinsic in the MPE/iX Intrinsics
Reference Manual for other codes pertaining to KSAM files.
|