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20.1.2. SAR$ PLUS COM Procedure Buffers and Tables
SAR$ COM
All buffers and tables must be provided by the calling program. The type definitions for
the buffers and tables and the definitions for the default buffer and table lengths are
contained in the element SAR$DEFN in the SYSLIB file (SYS$LIB$*SYSLIB) or
SYS$*RLIB$. This element is obtained with the COPY statement. The buffers and
tables for the COM function are similar to the buffers and tables for the READ and
WRITE functions. See 17.1.2 and 18.1.2 for details on the buffers and tables. Note that
for the COM function, the image buffer is not used if the input and output images do not
have character attributes.
The default buffer and table lengths are listed in Table 20–1.
Table 20–1. SAR$: PLUS COM Buffer and Table Length
Defaults
Identifier Value
SAR_IMAGE_BUFFER_WORD_LENGTH 63
SAR_TEXT_BUFFER_BYTE_LENGTH 132
SAR_ATTRIBUTE_TABLE_WORD_LENGTH 40
SAR_SELECT_LIST_BYTE_LENGTH 4
The buffer and table type definitions are listed in Table 20–2.
Table 20–2. SAR$: PLUS COM Buffer and Table Type Definitions
Identifier Type
SAR_IMAGE_BUFFER 63 words logical locatable
SAR_TEXT_BUFFER 132 ASCII characters locatable
SAR_ATTRIBUTE_TABLE 40 words logical locatable
SAR_SELECT_LIST 4 bytes logical locatable
The element SAR$DEFN also contains other definitions necessary to SAR$.
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