Double-byte character string fields

GDDM V3R2 Base Application Programming Reference

Double-byte character string fields

GDDM V3R2 Base Application Programming Reference
SC33-0868-02

Double-byte character strings (DBCS) fields are specially treated in some cases. (Double-byte character string fields are used for Kanji and Hangeul applications).

A field can be designated as DBCS by using GDDM-IMD's Field Definition steps, or Field Attribute Definition steps, or both of these.

A field can also be changed to or from DBCS by using a PS attribute adjunct and specifying a value of X'F8' (C'8') for DBCS, or C' ' (or any other valid value) for EBCDIC.

However, the special treatment of length adjuncts and cursor positioning provided for DBCS fields depends only on how the fields were defined to GDDM-IMD. Dynamically changing a field to or from DBCS does not change this treatment.

The special treatment is:

Length adjuncts
If a field is designated at map definition time as a DBCS field, the field's length adjunct is always interpreted as several two-byte characters. Hence, the length of the data in bytes is twice the value of the length adjunct.

Cursor position
If a field is designated at map definition time as a DBCS field, the cursor position specified by MSCPOS and returned by MSQPOS is interpreted as several two-byte characters. Hence, the position within the field in bytes is twice the value specified (minus 1).

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