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From: Lyndon Nerenberg <lyndon@orthanc.ca>
To: 9front@9front.org, Steve Simon <steve@quintile.net>
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Comments: In-reply-to Steve Simon <steve@quintile.net>
   message dated "Tue, 02 Feb 2021 19:56:44 +0000."
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Date: Tue, 02 Feb 2021 14:06:37 -0800
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Subject: Re: [9front] patch ssh.c extract window resolution
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> this means the environment variables ssh expects from vt dont exist. as =
a re=3D
> sult some unix apps like ls and man don=3DE2=3D80=3D99t format their out=
put correc=3D
> tly. this patch allows them to work as expected

In my UNIX .env (only sourced for "interactive" shells), if $TERM
is unset I set TERM=3Ddumb, PAGER=3D'col -b', and EDITOR=3Ded.  That seems
to get around most of the terminal-related issues.  And if you need
more than 80 columns of output, setting cols via stty(1) will take
care of that for programs that pay attention.

I also have a tiny UNIX program that prints column rulers, to help
with this sort of thing.

--lyndon

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from postmaster@1ess:
The following attachment had content that we can't
prove to be harmless.  To avoid possible automatic
execution, we changed the content headers.
The original header was:

	Content-Type: text/x-c; name="ruler.c"; charset="us-ascii"
	Content-Description: ruler.c
	Content-Disposition: attachment; filename="ruler.c"
	Content-Transfer-Encoding: quoted-printable
--upas-awuzbsyoozolyatgpmesjkgqyb
Content-Type: application/octet-stream
Content-Disposition: attachment; filename="ruler.c.suspect"
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/* ruler [cols] -- print a column-count ruler */

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>

int
main (int argc, char **argv)
{

	int cols, rows, i, j, skip;
	char *buf, *p;

	cols =3D -1;
	if (argc > 1) {
		cols =3D atoi(argv[1]);
		if (cols =3D=3D 0)
			exit(1);
	}
	if (cols =3D=3D -1) {
		struct winsize ws;
		if (ioctl(0, TIOCGWINSZ, &ws) =3D=3D -1)
			exit(1);
		if (ws.ws_col > 0)
			cols =3D ws.ws_col;
	}
	if (cols <=3D 0)
		cols =3D 80;
		=

	buf =3D malloc(cols + 1);
	if (buf =3D=3D NULL) {
		fprintf(stderr, "out of memory");
		exit(1);
	}

	rows =3D log10(cols);
	for (i =3D rows; i >=3D 0 ; i--) {
		skip =3D pow(10, i);
		p =3D buf;
		for (j =3D 1; j <=3D cols; j++) {
			if (j % skip)
				*p++ =3D ' ';
			else
				sprintf(p++, "%d", (j / skip) % 10);
		}
		buf[cols] =3D '\0';
		printf("%s\n", buf);
	}
	exit(0);
}

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