[9fans] acme Edit bug

[andrey mirtchovski]

Edit (or something in its chain) appears to be broken on buffer
boundary in p9p and in plan9. To test:

$ perl -e '{print "A"x1023;}' > t.txt # for plan9 acme replace 1023 with 8191
$ echo [any multibyte utf rune, for example Щ] >> t.txt
$ acme t.txt
[ in acme, middle-swipe "Edit , |cat" without the quotes ]

this happens with any binary on the other side of the pipe (originally
discovered with gofmt). it happens on multiples of that size too,
1024, 2048, etc for p9p. it does not occur if just the pipe is used,
only when going through Edit.

[Rob Pike]

That sounds like a bug I fixed in plan9port acme a couple of years
ago, but it's nice to see it's still broken.

I'll dig in.

-rob

[erik quanstrom]

Post by andrey mirtchovski
Edit (or something in its chain) appears to be broken on buffer
$ perl -e '{print "A"x1023;}' > t.txt # for plan9 acme replace 1023 with 8191
$ echo [any multibyte utf rune, for example Щ] >> t.txt

or with ubiquitous tools and codepoints

awk 'BEGIN{for(i = 0; i < 8191; i++) printf "a"; print "☺"}' > m

- erik

[andrey mirtchovski]

Post by erik quanstrom
or with ubiquitous tools and codepoints

don't deny me the opportunity to use the only thing I remember from perl :p

[erik quanstrom]

Post by andrey mirtchovski
Edit (or something in its chain) appears to be broken on buffer
$ perl -e '{print "A"x1023;}' > t.txt # for plan9 acme replace 1023 with 8191
$ echo [any multibyte utf rune, for example Щ] >> t.txt
$ acme t.txt
[ in acme, middle-swipe "Edit , |cat" without the quotes ]
this happens with any binary on the other side of the pipe (originally
discovered with gofmt). it happens on multiples of that size too,
1024, 2048, etc for p9p. it does not occur if just the pipe is used,
only when going through Edit.

in case you don't read the p9p list, there's a pach for this. the p9p
patch was applied; the plan 9 one has not yet been applied.

plan9 /n/sources/patch/acme-xfid
p9p https://bitbucket.org/rsc/plan9port/changeset/27213bfba2ec/

- erik