Int 7B  - Btrieve API (single User)                                        [f]

   DS:DX -> 38-byte parameter record (see below)

Return: return code field set

Note:  Btrieve sets low byte of vector to 33h; this serves as the installation
     check

See Also: INT 2F/AX=AB01h,INT 7F/AX=0200h

Format of Btrieve parameter record:
Offset Size    Description
 00h   DWORD   pointer to data buffer
 04h   WORD    data buffer length
 06h   DWORD   pointer to 90-byte record containing positioning info
       (should be same for all calls for same file)
 0Ah   DWORD   pointer to 38-byte FCB info buffer
       (should be same for all calls for same file)
 0Eh   WORD    function code (see below)
 10h   DWORD   pointer to file name/key buffer
 14h   BYTE    key length
 15h   BYTE    key number
 16h   DWORD   pointer to status code (see below)
 1Ah   WORD    interface code (version specific)
       6176h version 5.10

Values for function code:
 00h   open
 01h   close
 02h   insert
 03h   update
 04h   delete
 05h   get_equal
 06h   get_next
 07h   get_prev
 08h   get_greater
 09h   get_gr_eql
 0Ah   get_less
 0Bh   get_less_eq
 0Ch   get_first
 0Dh   get_last
 0Eh   create
 0Fh   stat
 10h   extend
 11h   set_dir: set directory information
 12h   get_dir: get directory information
 13h   begin_trans
 14h   end_trans
 15h   abort_trans
 16h   get_pos: get record position number
 17h   get_direct: get data by sending record position
 18h   step_next
 19h   stop
 1Ah   version
 1Bh   unlock
 1Ch   reset
 1Dh   set owner
 1Eh   clear owner
 1Fh   create supplemental index
 20h   drop supplemental index
 21h   step first
 22h   step last
 23h   step previous
 24h   get next extended: get multiple records using a filter
 25h   get previous extended: get multiple records using a filter
 26h   step next extended: get multiple records using a filter
 27h   step previous extended: get multiple records using a filter
 28h   insert extended: insert one or more records
 31h   ???
 add 50 (32h) to any "get" operation to just return the key data
 add 100 (64h) for a single-record wait lock (automatically released on next
       get)
 add 200 (C8h) for a single-record nowait lock (nowait lock returns error 54h
       or 55h if record already locked)
 add 300 (12Ch) for a multiple-record wait lock (not released until unlock
       called)
 add 400 (190h) for a multiple-record nowait lock (nowait lock returns error
       54h or 55h if record already locked)

Values for status code:
 00h   successful
 01h   invalid operation
 02h   I/O error
 03h   file not open
 04h   key value not found
 05h   duplicate key value
 06h   invalid key number
 07h   different key number
 08h   invalid positioning
 09h   end of file
 0Ah   modifiable key value error
 0Bh   invalid file name
 0Ch   file not found
 0Dh   extended file error
 0Eh   pre-image open error
 0Fh   pre-image I/O error
 10h   expansion error
 11h   close error
 12h   disk full
 13h   unrecoverable error
 14h   record manager inactive
 15h   key buffer too short
 16h   data buffer length overrun
 17h   position block length
 18h   page size error
 19h   create I/O error
 1Ah   number of keys
 1Bh   invalid key position
 1Ch   invalid record length
 1Dh   invalid key length
 1Eh   not a Btrieve file
 1Fh   file already extended
 20h   extended I/O error
 22h   invalid extension name
 23h   directory error
 24h   transaction error
 25h   transaction is active
 26h   transaction control file I/O error
 27h   end/abort transaction error
 28h   transaction max files
 29h   operation not allowed
 2Ah   incomplete accelerated access
 2Bh   invalid record address
 2Ch   null key path
 2Dh   inconsistent key flags
 2Eh   access to file denied
 2Fh   maximum open files
 30h   invalid alternate sequence definition
 31h   key type error
 32h   owner already set
 33h   invalid owner
 34h   error writing cache
 35h   invalid interface
 36h   variable page error
 37h   autoincrement error
 38h   incomplete index
 39h   expanded memory error
 3Ah   compression buffer too short
 3Bh   file already exists
 3Ch   reject count reached
 3Dh   work space too small
 3Eh   incorrect descriptor
 3Fh   invalid extended insert
 40h   filter limit reached
 41h   incorrect field offset
 4Ah   automatic transaction abort
 4Eh   deadlock detected
 50h   conflict
 51h   lock error
 52h   lost position
 53h   read outside transaction
 54h   record in use
 55h   file in use
 56h   file table full
 57h   handle table full
 58h   incompatible open mode
 5Ah   redirected device table full
 5Bh   server error
 5Ch   transaction table full
 5Dh   incompatible lock type
 5Eh   permission error
 5Fh   session no longer valid
 60h   communications environment error
 61h   data message too small
 62h   internal transaction error