Intermec Janus 2010 Reference Manual page 92

im_irl_k
The a position in the matrix is one of the following:
IM_NO_LENGTH
IM_LENGTH
IM_RANGE
If IM_LENGTH is specified in the a position, the actual length of the data
string is placed in the d position (and b and c are not used).
If IM_RANGE is specified in the a position, the data length must be within
the range of b and c (and d is not used).
Set any unused table entries to {IM_NO_LENGTH,0,0,0}.
The mask_string parameter sets up a data mask that received data must
match. mask_string can accept a string of constants or wildcard characters.
For example, use the string ### - #### to accept only phone numbers.
You can use one or more of these wildcard characters to define the mask:
#
@
?
NULL (CHR$(0))
You must allocate at least 256 bytes to the irl_string parameter.
OUT Parameters:
The cmd_count returned is 0 unless an abort command is passed in the
string.
The status_code parameter is a standard status codes listed in Appendix A,
"Status Codes."
None.
Return Value:
3-52
Accept data of any length
Accept data of a specific length
Accept data within a length range
Numeric
Alpha
Alphanumeric printable
No mask