From: drb@msu.edu (Dennis Boone)
Subject: [TUHS] Literal character escapes in v7
Date: Tue, 07 Nov 2017 04:07:23 -0500 [thread overview]
Message-ID: <20171107090723.F2CC3A585D1@yagi.h-net.msu.edu> (raw)
In-Reply-To: (Your message of Mon, 06 Nov 2017 22:21:12 -0600.) <b72ba3f2-5f38-6194-4925-b3b9e0caf4b9@gmail.com>
> I'm not looking for code review, but the code is intended to replace
> the tabs and backspaces with \t and \b respectively, but I haven't
> been able to test it because I can't seem to make a backspace
> character appear in input. In later unices, ^V followed by the
> backspace would work, but that's not part of v7. Backspace itself is
> my erase character, so anytime I just type it, it backspaces :).
This bit from the middle of sys/dev/tty.c seems to indicate that you
escape it with \:
} else {
mc = maptab[c];
if (c==tp->t_erase || c==tp->t_kill)
mc = c;
if (mc && (mc==c || (tp->t_flags&LCASE))) {
if (bp[-2] != '\\')
c = mc;
bp--;
}
}
On my test v7 system if I type backslash control-h:
# stty
speed 0 baud
erase = '^H'; kill = '^U'
even -nl echo -tabs
# echo \^H | od -c
0000000 \b \n
0000002
#
De
next prev parent reply other threads:[~2017-11-07 9:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-07 4:21 Will Senn
2017-11-07 4:34 ` arnold
2017-11-07 4:49 ` Will Senn
2017-11-07 5:00 ` Will Senn
2017-11-07 8:08 ` arnold
2017-11-07 9:07 ` Dennis Boone [this message]
2017-11-07 13:55 ` Will Senn
2017-11-07 11:21 ` Dan Cross
2017-11-07 14:59 ` Will Senn
2017-11-07 15:33 ` Don Hopkins
2017-11-08 16:48 ` Ralph Corderoy
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