TOPS-10 Monitor Calls Manual Volume 2 AA-K039D ... - Trailing-Edge

RESCAN [TTCALL 10,]
22.138 RESCAN [TTCALL 10,]
FUNCTION
Resets the input buffer pointer to point to the beginning of the
previous command. Note that if the RESCAN UUO is issued after the
first terminal input or output instruction, the command is no longer
in the buffer.
CALLING SEQUENCE
RESCAN flag
return 1
return 2
In the calling sequence, the program supplies the flag, which controls
the action of returning from the call. The flag is bit 35 of the
word. If the flag is not set, the call always returns at return 1.
If the flag is set, the call returns at return 2 when no command is Tn
the input buffer, otherwise, the call takes return 1.
EXAMPLE
RESCAN 1
SKPINL
JRST PROMPT
;Read TTY input
;Is anything there?
;No, must be typeahead
;Read command line
COMMON PROGRAMMING ERRORS
Placing a comma after the flag.
22-351