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You're never gonna be right 100% of the time when guessing how much buffer
space you need. This avoids having to make that type of decision in a bunch
of cases. :^)
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Basic text editing in a TextBox works. How very cool :^)
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This makes backspace work correctly when line editing with bash-2.05b.
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(Don't) use this to implement short-form output in ls.
I'm too tired to make a nice column formatting algorithm.
I just wanted something concise when I type "ls".
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We now respect the VINTR and VQUIT control characters in the termios.
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After I made stdio buffered, we were dropping anything unflushed on exit.
Since /bin/clear just prints out some escape sequences without a newline,
the entire buffer was being discarded.
Also add VirtualConsole::clear() that handles clearing of background VC's.
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Instead of memcpy'ing the entire screen every time we press enter at the
bottom, use the VGA start address register to make a "view" onto the
underlying memory that moves downward as we scroll.
Eventually we run out of memory and have to reset to the start of the
buffer. That's when we memcpy everything. It would be cool if there was
some way to get the hardware to act like a ring buffer with automatic
wrapping here but I don't know how to do that.
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Plumb it all the way to the VirtualConsole. Also fix /bin/cat to write()
the whole chunks we get from read() directly to stdout.
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For testing, I made cat put itself into a new process group.
This should eventually be done by sh between fork() and exec().
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I'm still playing around with finding a style that I like.
This is starting to feel pleasing to the eye. I guess this is how long
it took me to break free from the habit of my previous Qt/WK coding style.
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Ran into a horrendous bug where VirtualConsole would overrun its buffer
and scribble right into some other object if we were interrupted while
processing a character. Slapped an InterruptDisabler onto onChar for now.
This provokes an interesting question though.. if a process is killed
while its in kernel space, how the heck do we release any locks it held?
I'm sure there are many different solutions to this problem, but I'll
have to think about it.
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Also fix ttyname() syscall to include "/dev/" in the name.
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We now make three VirtualConsoles at boot: tty0, tty1, and tty2.
We launch an instance of /bin/sh in each one.
You switch between them with Alt+1/2/3
How very very cool :^)
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This is a mess right now, but I'd rather commit as I go.
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