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19.1.2. PLUS ATREAD Procedures Buffers and Tables
SAR$ ATREAD
All buffers and tables must be provided by the calling program. The type definitions for
the buffers and tables, and 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$. They may be obtained with the COPY statement. The buffers and tables
for the ATREAD function are similar to the buffers and tables for the READ and WRITE
functions. See 17.1.2 and 18.1.2 for details on the buffers and tables.
The default buffer and table lengths are listed in Table 19–1.
Table 19–1. SAR$: PLUS ATREAD Buffer and Table
Length Defaults
Identifier Value
SAR_IO_BUFFER_WORD_LENGTH 448
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 19–2.
Table 19–2. SAR$: PLUS ATREAD Buffer and Table
Type Definitions
Identifier Type
SAR_IO_BUFFER 448 words logical locatable
SAR_IMAGE_BUFFER 63 words logical locatable
SAR_TEXT_BUFFER 132 ASCII characters locatable
SAR_ATTRIBUTE_TABLE 40 words logical locatable
SAR_SELECT_LIST 4 bytes logical locatable
The element SAR$DEFN also contains other definitions necessary to SAR$.
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