This function uses the mc5p or mc4 and mc5 capabilities, if they are
present, to ship given data to a printer attached to the terminal.
Note that the mcprint code has no way to do flow control with the
printer or to know how much buffering it has. Your application is
responsible for keeping the rate of writes to the printer below its
continuous throughput rate (typically about half of its nominal cps
rating). Dot-matrix printers and 6-page-per-minute lasers can
typically handle 80cps, so a good conservative rule of thumb is to
sleep for a second after shipping each 80-character line.
The mcprint function returns ERR if the write operation aborted for
some reason. In this case, errno will contain either an error
associated with write(2) or one of the following:
Capabilities for printer redirection do not exist.
Couldn't allocate sufficient memory to buffer the printer write.
When mcprint succeeds, it returns the number of characters actually
sent to the printer.
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