Re: [9fans] vt

Re: [9fans] vt

[Russ Cox]

wow.
i can't think of anything else to say.
wow.
i'm scared.

Re: [9fans] vt

[Douglas A. Gwyn]

Russ Cox wrote:
> i'm scared.

Well, I did forget to set the initial tab stops (fixed in the version
I sent to Dave), which was a different form of a bug in the base code.
Otherwise, why be scared?  It'll all described in the manuals,
especially the VT100 Technical Manual, except for a handful of
corrections that I penciled into my copy of the manuals over the
decades.

Re: [9fans] vt

[Boyd Roberts]

"Douglas A. Gwyn" <gwyn@arl.army.mil> a crit dans le message news:
3AD1CFF0.D62827D@arl.army.mil...
> Russ Cox wrote:
> > i'm scared.
>
> Well, I did forget to set the initial tab stops (fixed in the version
> I sent to Dave), which was a different form of a bug in the base code.
> Otherwise, why be scared?

a vt100 emulator?  when do we get to see a 3270 emulator?

be _very_ afraid.

--
Boyd Roberts        http://www.insultant.net        boyd@insultant.net

What do you know about surfing, Major?  You're from goddamn New Jersey.

    -- Lt. Colonel Kilgore

[9fans] vt

[forsyth]

this vt stuff is all very well, but has anyone got an emulator
for a proper terminal, the 3270?

Re: [9fans] vt

[David Lukes]

> this vt stuff is all very well, but has anyone got an emulator
> for a proper terminal, the 3270?

I think that people who swear should be removed from the list.

Just to scare you,
there is apparently a TCL 3270 interface, see:
	http://www.geocities.com/SiliconValley/Peaks/7814/

Cheers,
	Dave.

Re: [9fans] vt

[Boyd Roberts]

From: "David Lukes" <davel@luchie-chowchows.demon.co.uk>
> Just to scare you,
> there is apparently a TCL 3270 interface, see:
> http://www.geocities.com/SiliconValley/Peaks/7814/

what, they didn't write it in perl?

Re: [9fans] vt

[presotto]

[-- Attachment #1: Type: text/plain, Size: 122 bytes --]

I take it back, I just can't read terminfo's (imagine that).  I added this
code to vt.c,  I'll put it in the next wrap.

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From: Micah Stetson <micah@cnm-vra.com>
To: 9fans@cse.psu.edu
Subject: [9fans] vt
Date: Tue, 3 Apr 2001 23:08:32 -0700
Message-ID: <20010403230832.B19367@cnm-vra.com>

I notice that there are a bunch of improvements in vt with
this update.  I want to thank whoever did all that work (Russ,
I think?).  But I noticed that some garbage was being left on
my screen while scrolling in mutt.  Although, strange stuff
still goes on once in a while, most of the problem seemed to
disappear with the following change to vt.c:

/mnt/wrap/sys/src/cmd/vt/vt.c:581 c /sys/src/cmd/vt/vt.c:581
< 								clear(Rpt(pt(0, 0), pt(x, ymax+1)));
---
> 								clear(Rpt(pt(0, 0), pt(xmax+1, y)));

The code is supposed to clear from the first character on the
screen up through the current position.  As it was, this line
would clear everything to the left of the current position and
the next would clear everything on the current line up to the
current position.  I think the line should really clear
everything above the current position, and at least mutt seems
to work a little better that way.

Micah

Re: [9fans] vt

[Boyd Roberts]

<presotto@plan9.bell-labs.com> a crit dans le message news:
20010407012253.2BD7919A54@mail.cse.psu.edu...
> I take it back, I just can't read terminfo's (imagine that).  I added this
> code to vt.c,  I'll put it in the next wrap.

the compiled crap is impossible.  for all its faults, at least
termcap was ascii text.

Re: [9fans] vt

[Douglas A. Gwyn]

Boyd Roberts wrote:
> the compiled crap is impossible.  for all its faults, at least
> termcap was ascii text.

Terminfo is text, too, but the compiled form is used at run time.
There are utilities to convert back and forth,

Re: [9fans] vt

[Boyd Roberts]

"Douglas A. Gwyn" <gwyn@arl.army.mil> a crit dans le message news:
3AD1CE1A.B490D57C@arl.army.mil...
> Boyd Roberts wrote:
> > the compiled crap is impossible.  for all its faults, at least
> > termcap was ascii text.
>
> Terminfo is text, too, but the compiled form is used at run time.

yes i knew that.

> There are utilities to convert back and forth,

and they suck.

--
Boyd Roberts        http://www.insultant.net        boyd@insultant.net

What do you know about surfing, Major?  You're from goddamn New Jersey.

    -- Lt. Colonel Kilgore

Re: [9fans] vt

[presotto]

[-- Attachment #1: Type: text/plain, Size: 224 bytes --]

Is there independent confirmation out there that this is a good or
at least a harmless thing to do?  I dinna have a real vt100/220
lying around and the termcap entry I have on a Unix system doesn't
really seem to agree.

[-- Attachment #2: Type: message/rfc822, Size: 2176 bytes --]

From: Micah Stetson <micah@cnm-vra.com>
To: 9fans@cse.psu.edu
Subject: [9fans] vt
Date: Tue, 3 Apr 2001 23:08:32 -0700
Message-ID: <20010403230832.B19367@cnm-vra.com>

I notice that there are a bunch of improvements in vt with
this update.  I want to thank whoever did all that work (Russ,
I think?).  But I noticed that some garbage was being left on
my screen while scrolling in mutt.  Although, strange stuff
still goes on once in a while, most of the problem seemed to
disappear with the following change to vt.c:

/mnt/wrap/sys/src/cmd/vt/vt.c:581 c /sys/src/cmd/vt/vt.c:581
< 								clear(Rpt(pt(0, 0), pt(x, ymax+1)));
---
> 								clear(Rpt(pt(0, 0), pt(xmax+1, y)));

The code is supposed to clear from the first character on the
screen up through the current position.  As it was, this line
would clear everything to the left of the current position and
the next would clear everything on the current line up to the
current position.  I think the line should really clear
everything above the current position, and at least mutt seems
to work a little better that way.

Micah

Re: [9fans] vt

[Douglas A. Gwyn]

presotto@plan9.bell-labs.com wrote:
> Is there independent confirmation out there that this is a good or
> at least a harmless thing to do?
> From: Micah Stetson <micah@cnm-vra.com>
> /mnt/wrap/sys/src/cmd/vt/vt.c:581 c /sys/src/cmd/vt/vt.c:581
> <                                                               clear(Rpt(pt(0, 0), pt(x, ymax+1)));
> ---
> >                                                               clear(Rpt(pt(0, 0), pt(xmax+1, y)));

That is indeed a correct fix to a genuine bug.

Here are some additional errors in the VT100 display emulation (/sys/src/cmd/vt/vt.c):
 * Known bugs:
	...
should add:
 *
 * 5. Cursor key sequences aren't selected by keypad application mode.
 *
 * 6. "VT220" mode (-2) currently just switches the default cursor key
 *	functions (same as -a); it's still just a VT100 emulation.
 *
 * 7. VT52 mode and a few other rarely used features are not implemented.
...
		case '\011':		/* tab to next tab stop; if none, tab modulo 8 */
			...
			else
				x = (x|7)+1;
should be:
		case '\011':		/* tab to next tab stop; if none, to right margin */
			...
			else
				x = xmax;
...
		case '\030':	/* CAN: cancel escape sequence */
		case '\031':	/* EM: cancel escape sequence, display checkerboard */
should be:
		case '\030':	/* CAN: cancel escape sequence, display checkerboard (not implemented) */
		case '\031':	/* EM */
...
		case '\033':
			switch(get_next_char()){
should add:
			/*
			 * 1 - graphic processor option on (no-op; not installed)
			 */
			case '1':
				break;

			/*
			 * 2 - graphic processor option off (no-op; not installed)
			 */
			case '2':
				break;

...
			 * D - active position down a line, scroll if at bottom margin.
should add:
			 * (Original VT100 had a bug: tracked new-line/line-feed mode.)
...
			 * H - set tab stop at current column.
			 * (This is move to home in some VT100 docs, but that use seems deprecated.  -rsc)
should be:
			 * H - set tab stop at current column.
			 * (This is cursor home in VT52 mode (not implemented).)
...
			 * Z - identification.  the terminal
				...
				sendnchars2(5, "\033[?6c");
denotes VT102, which supports insert mode, delete-character, etc. which are not implemented;
should be:
			 * Z - identification.  The terminal
				...
				sendnchars2(7, "\033[?1;2c");	/* VT100 with AVO option */
...
			 * > - set numeric keypad mode on
should be:
			 * > - set numeric keypad mode on (not implemented)
...
			 * = - set numeric keypad mode off
should be:
			 * = - set numeric keypad mode off (not implemented)
...
			case '#':
				...
				case '6':		/* Double-width line */
should be:
				case '5':		/* single-width single-height line */
				case '6':		/* Double-width line */
				case '7':		/* screen print */
...
					 * c - same as ESC Z: who are you?
should be:
					 * c - same as ESC Z: what are you?
...
					case 'l':
						...
							case 25:	/* cursor off */
								cursoron = 0;
								cursoff();
								break;
							case 30:	/* screen invisible */
should be:
					case 'l':
						...
							case 30:	/* screen invisible (not supported through VT220 if ever) */
...
						}else if(noperand == 2){
							switch(operand[1]){
							case 1:	/* set cursor key to cursor */
								break;
							case 2:	/* set VT52 */
should be:
						}else while(--noperand > 0){
							switch(operand[noperand]){
							case 1:	/* set cursor keys to send ANSI functions: ESC [ A..D */
								break;
							case 2:	/* set VT52 mode (not implemented) */
...
							case 6:	/* set origin to absolute */
								originrelative = 0;
should add:
								x = y = 0;
...
							case 9:	/* reset interlacing mode */
								break;
should add:
							case 25:	/* text cursor off (VT220) */
								cursoron = 0;
								cursoff();
								break;
...
					case 'h':
						...
							case 25:	/* cursor on */
								cursoron = 1;
								curson(0);
								break;
							case 30:	/* screen visible */
should be:
					case 'h':
						...
							case 30:	/* screen visible (not supported through VT220 if ever) */
...
						}else if(noperand == 2){
							switch(operand[1]){
							case 1:	/* set cursor key to application */
								break;
should be:
						}else while(--noperand > 0){
							switch(operand[noperand]){
							case 1:	/* set cursor keys to send application function: ESC O A..D */
								break;
...
							case 5:	/* set reverse video */
should be:
							case 5:	/* set screen to reverse video (not implemented) */
...
							case 6:	/* set origin to relative */
								originrelative = 1;
should add:
								x = 0;
								y = yscrmin;
...
					/*
					 * Turn on list of LEDs; turn off others.
					 */
					case 'q':
						print("LED\n");
should be:
					/*
					 * n - request various reports
					 */
					case 'n':
						switch(operand[0]){
						case 5:	/* status */
							sendnchars2(4, "\033[0n");	/* terminal ok */
							break;
						case 6:	/* cursor position */
							sendnchars2(sprintf(buf, "\033[%d;%dR",
								originrelative ? y+1 - yscrmin : y+1, x+1), buf);
							break;
						}
						break;

					/*
					 * q - turn on list of LEDs; turn off others.
					 */
					case 'q':
//						print("LED\n");
...
					case 'r':
						...
						case 2:
							yscrmax = operand[1]-1;
should add:
							if(yscrmax > ymax)
								yscrmax = ymax;
...
Between cases 'r' and 'A' add:

					/*
					 * x - report terminal parameters
					 */
					case 'x':
						sendnchars2(20, "\033[3;1;1;120;120;1;0x");
						break;

					/*
					 * y - invoke confidence test
					 */
					case 'y':
						break;
...
					 * D - cursor left (I think)
should be:
					 * D - cursor left
...
					 * H and f - cursor motion.  operand[0] is row and
					 * operand[1] the row, origin 1
should be:
					 * H and f - cursor motion.  operand[0] is row and
					 * operand[1] is column, origin 1.
...
					case 'K':
						...
							case 2:
								clear(Rpt(pt(x, y), pt(xmax+1, y+1)));
should be:
					case 'K':
						...
							case 2:
								clear(Rpt(pt(0, y), pt(xmax+1, y+1)));
...
					 * L - insert a line at cursor position
should be:
					 * L - insert a line at cursor position (VT102 and later)
...
					 * M - delete a line at the cursor position
should be:
					 * M - delete a line at cursor position (VT102 and later)
...
					case '=':
						...
						break;
should be deleted; it doesn't correspond to any model through VT220.

By the way, there are a lot of bogus VT100 termcap entries in circulation.
Here are the relevant entries from the last snapshot of BRL's official
termcap database:

#
# DEC VT100 with variations for Advanced Video Option and screen width.
# The following SET-UP modes are assumed for normal operation:
#	ANSI_MODE	AUTO_XON/XOFF_ON	NEWLINE_OFF	80_COLUMNS
#	WRAP_AROUND_ON
# Other SET-UP modes may be set for operator convenience or communication
# requirements; I recommend
#	SMOOTH_SCROLL	AUTOREPEAT_ON	BLOCK_CURSOR	MARGIN_BELL_OFF
#	SHIFTED_3_#
# Unless you have a graphics add-on such as Digital Engineering's VT640
# (and even then, whenever it can be arranged!) you should set
#	INTERLACE_OFF
# Hardware tabs are assumed to be set every 8 columns; they can be set up
# by the "reset", "tset", or "tabs" utilities (use vt100-x, 132 columns, for
# this).  I have included some compatible code in "rs" for the VT640 if you
# have one.  No delays are specified; use "stty ixon -ixany" to enable DC3/DC1
# flow control!
# Thanks to elsie!ado (Arthur David Olson) for numerous improvements.
d0|vt100|DEC VT100 with AVO:\
	:ae=^O:as=^N:bl=^G:cd=\E[J:ce=\E[K:cm=\E[%i%d;%dH:co#80:cr=^M:\
	:cs=\E[%i%d;%dr:ct=\E[3g:DO=\E[%dB:do=^J:ho=\E[H:is=\E<\E)0:it#8:\
	:k0=\EOP:k1=\EOQ:k2=\EOR:k3=\EOS:kb=^H:kd=\EOB:ke=\E[?1l\E>:kl=\EOD:\
	:kr=\EOC:ks=\E[?1h\E=:ku=\EOA:l0=PF1:l1=PF2:l2=PF3:l3=PF4:LE=\E[%dD:\
	:le=^H:li#24:ll=\E[24H:mb=\E[5m:md=\E[1m:me=\E[m:mr=\E[7m:ms:nd=\E[C:\
	:nw=\EE:rc=\E8:RI=\E[%dC:\
	:rs=^X\E<\E2\E[?9h^]\E^L^X\E[20l\E[?3;9;6l\E[r\E[m\E[q\E(B^O\E)0\E>:\
	:sc=\E7:se=\E[m:sf=^J:so=\E[7m:sr=\EM:st=\EH:ta=^I:ti=\E[?7l:\
	:te=150\E[?7h:ue=\E[m:UP=\E[%dA:up=\EM:us=\E[4m:vt#3:xo:\
	:cl=\E[H\E[J:\
	:bs:kn#4:pt:
dv|vt100-v|DEC VT100 without AVO:\
	:ue@:us@:\
	:tc=vt100:
d8|vt100-w|DEC VT100 with AVO in 132-column mode:\
	:co#132:ct=\E[?3h\E[g:\
	:rs=^X\E<\E2\E[?9h^]\E^L^X\E[20l\E[?9;6l\E[?3h\
\E[r\E[m\E[q\E(B^O\E)0\E>:\
	:tc=vt100:
d9|vt100-x|DEC VT100 without AVO in 132-column mode:\
	:ct=\E[?3h\E[g:li#14:ll=\E[14H:ue@:us@:\
	:tc=vt100-w:
#
# DEC VT100 with visible bell from John I. Leonard <irv@BRL-TGR.ARPA>
db|vt100-vb|DEC VT100 with visual bell:\
	:vb=\E[?5h\200\200\200\200\200\200\200\200\200\200\200\200\200\E[?5l:\
	:tc=vt100:
# Note: above assumes you like dark background; following added by DAG:
dB|vt100-rvb|DEC VT100 with reverse video and visual bell:\
	:vb=\E[?5l\200\200\200\200\200\200\200\200\200\200\200\200\200\E[?5h:\
	:tc=vt100:
#
# DEC VT102 from Eric K. Bustad <ihnp4!eric.bustad>
dy|vt102|DEC VT102:\
	:im=\E[4h:ei=\E[4l:al=\E[1L:dl=\E[1M:dc=\E[1P:tc=vt100:
dz|vt102-w|DEC VT102, 132 columns:\
	:im=\E[4h:ei=\E[4l:al=\E[1L:dl=\E[1M:dc=\E[1P:tc=vt100-w:
#
# vt-220 termcap courtesy of Davis, Polk & Wardwell
#
d2|vt220|vt-220|pt220|pt-220|dec vt220:\
	:co#80:tc=vt220-x:
d3|vt220w|vt-220w|pt220w|pt-220w|dec vt220w:\
	:co#132:tc=vt220-x:
d4|vt220-x|dec vt220 generic:\
	:ae=4\E(B:al=\E[L:am:as=2\E(<:bl=^G:bs:\
	:cd=50\E[J:ce=3\E[K:cl=50\E[;H\E[2J:\
	:cm=10\E[%i%d;%dH:cr=^M:cs=\E[%i%d;%dr:\
	:dc=\E[P:dl=\E[M:do=\E[B:ei=\E[4l:ho=\E[H:\
	:if=/usr/lib/tabset/vt100:im=\E[4h:is=\E[1;24r\E[24;1H:\
	:k1=\EOP:k2=\EOQ:k3=\EOR:k4=\EOS:\
	:k5=\E[17~:k6=\E[18~:k7=\E[19~:k8=\E[20~:\
	:k9=\E[21~:k10=\E[22~:k11=\E[23~:k12=\E[24~:\
	:k13=\E[25~:k14=\E[26~:k15=\E[28~:k16=\E[29~:\
	:k17=\E[31~:k18=\E[32~:k19=\E[33~:k20=\E[34~:\
	:kb=^?:kd=\E[B:kl=\E[D:kr=\E[C:ku=\E[A:\
	:le=^H:li#24:mb=2\E[5m:md=2\E[1m:me=2\E[m:mi:mr=2\E[7m:\
	:nd=\E[C:nl=^J:pt:\
	:rc=\E8:rf=/usr/lib/tabset/vt100:\
	:rs=\E>\E[?3l\E[?4l\E[?5l\E[?7h\E[?8h:\
	:sc=\E7:se=\E[m:sf=\ED:so=\E[7m:sr=\EM:\
	:ta=^I:ue=\E[m:up=\E[A:us=\E[4m:vt#3:xn:

[9fans] vt

[Micah Stetson]

I notice that there are a bunch of improvements in vt with
this update.  I want to thank whoever did all that work (Russ,
I think?).  But I noticed that some garbage was being left on
my screen while scrolling in mutt.  Although, strange stuff
still goes on once in a while, most of the problem seemed to
disappear with the following change to vt.c:

/mnt/wrap/sys/src/cmd/vt/vt.c:581 c /sys/src/cmd/vt/vt.c:581
< 								clear(Rpt(pt(0, 0), pt(x, ymax+1)));
---
> 								clear(Rpt(pt(0, 0), pt(xmax+1, y)));

The code is supposed to clear from the first character on the
screen up through the current position.  As it was, this line
would clear everything to the left of the current position and
the next would clear everything on the current line up to the
current position.  I think the line should really clear
everything above the current position, and at least mutt seems
to work a little better that way.

Micah