The data stream build program addresses the page buffer, composed
by the page and text build program (DFHPBP). The page buffer contains
lines of output data that are to be written to a terminal other than
an IBM® 3270 Information Display
System. The number of lines is contained in the TTPLINES field. The
data stream build program performs the following functions on the
data in the page buffer:
Truncates trailing blanks within data lines
Substitutes strings of physical device control characters for
logical new-line characters that terminate each line of data
Provides a format management header (FMH) for some z/OS® Communications Server-supported devices
Allows horizontal and vertical tab processing.
Figure 1 shows the relationships
between the components of data stream build. Figure 1. Data stream build
interfaces
Note:
DFHDSB is entered from the
page build program to process the page buffer.
For SEND TEXT commands with the NOEDIT option specified, page
buffer compression is skipped and control returns to DFHPBP, which
calls the terminal page processor (DFHTPP).
For SEND TEXT commands without the NOEDIT option, the appropriate
device control characters for the target device are selected for substitution.
The page buffer containing the data to be compressed is located
through the address stored at TTPPGBUF.
After compression of the page buffer data, control returns to
DFHPBP, which calls DFHTPP to provide disposition of the page.
