[TUHS] Diff and Patch on v7

[Clem Cole]

Will that is the output that would have go into patch(1).  As Leah says,
the old days we used diff -e to create the patch and then ed file
<diff_output
That said, when Larry wrote patch, V7 was still very much alive and kicking
and Larry had come from that world/his code would be likely to be fairly
clean of vax-isms.  I bet if you can find a version that will compile and
run on V7.   V6 is likely to be more difficult since the language changes
for stdio.  But patch(1) is small and simple so I bet even that would be
pretty straight forward.


On Sat, Jul 25, 2020 at 10:29 AM Will Senn <will.senn at gmail.com> wrote:

> On 7/25/20 9:03 AM, Leah Neukirchen wrote:
> > Will Senn <will.senn at gmail.com> writes:
> >
> >> I got a diff for adding actual backspace and delete to v7, linked off
> >> of gunkies... Anyhow, I can manually edit the referenced files and
> >> rebuild, but I would rather do it canonically. I don't see patch
> >> anywhere, so did v7 users use diffs to patch source and if so what's
> >> the magic?
> > patch(1) was written by Larry Wall in 1985, and released over Usenet.
> >
> > v7 users likely used diff -e, and piped to ed to apply it.
> >
> That makes sense. So, if that's how it went then I'm wondering if my
> diff is meant to run against source on the host and the results placed
> into v7, rather than run in v7. Does this look like a modern diff vs the
> old stuff?:
>
> --- usr/src/cmd/getty.c    1979-05-05 08:19:21.000000000 +0100
> +++ usr.fix/src/cmd/getty.c    2018-01-09 11:07:37.157953044 +0100
> @@ -5,11 +5,11 @@
>
>   #include <sgtty.h>
>   #include <signal.h>
> -#define ERASE    '#'
> -#define KILL    '@'
> +#define ERASE    '\177'
> +#define KILL    '\025'
>
>   struct sgttyb tmode;
> -struct tchars tchars = { '\177', '\034', '\021', '\023', '\004', '\377' };
> +struct tchars tchars = { '\003', '\034', '\021', '\023', '\004', '\377' };
>
>   struct    tab {
>       char    tname;        /* this table name */
>
>
> Will
>
> --
> GPG Fingerprint: 68F4 B3BD 1730 555A 4462  7D45 3EAA 5B6D A982 BAAF
>
>
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