The BBC and Master Computer Public Domain Library

9BCF Check & skip Program Line end

Submitted by Steve Fewell

Description:

Firstly, this routine calls routine &9BA6 to check for the end of statement character (':', '<cr>', 'ELSE') if end of
Statement was not found then issue 'Syntax error'.

If the Line terminator character was ':', then exit (as nothing more to do - as we are not at the line end yet).

Now, either '<cr>' or 'ELSE' have been found, so we have to skip to the next statement/program line.
If the BASIC Text pointer A MSB is 7 (i.e. PTR A points to an address between &0700 and &07FF) then jump to &8F86
to return to the command line input prompt (as we are not currently executing a program).

Otherwise, the next line number needs to be processed and skipped before we continue running the program.
Get the next byte after the line terminator.
If the byte is negative (i.e. &FF) then jump to &8F86 to prompt for the next conmmand line input - as we have
reached the end of the program that we were executing.

If the TRACE flag (&20) is not 0 then TRACE is currently on, so set the IWA to the 2-byte line number (located after the
line terminator character) & call routine &9C4B to display the line number on the screen between square braces (i.e.[xxx]).

[&9BF2] Add 3 to the BASIC Text pointer A address (&0B-&0C) to skip the Line Number and Line length, set the
BASIC Text Pointer A Offset (&0A) to 1 and exit.

Disassembly for the Check & skip Program Line end routine