[vim/vim] Ctrl-X fails to decrement some hex values (#2746)

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Hengyang Zhao

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Mar 23, 2018, 2:03:25 PM3/23/18
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Version: 8.0.1573
Platform: Fedora 27 x86_64

Ctrl-X fails to decrement 0xfffffffffffffffe.

How to reproduce:

  1. Start vim version 8.0.1573 vim -N -u NONE.
  2. Insert 0x0.
  3. In normal mode, do Ctrl-X on the hex number several times. It will first become 0xffffffffffffffff, then stop at 0xfffffffffffffffe and won't change on more Ctrl-X strokes.
  4. Do Ctrl-A on 0xfffffffffffffffe, it directly goes back to 0x0000000000000000, skipping 0xffffffffffffffff.
  5. Repeat from step 2 for bin and oct using 0b0 or 00.

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K.Takata

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Jun 7, 2018, 11:03:06 AM6/7/18
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I found that vim_str2nr couldn't convert some large values.
E.g. It converts the strings between "0xfffffffffffffff0" to "0xfffffffffffffffe" to 0xffffffffffffffff.

I wrote a patch for this:
https://bitbucket.org/k_takata/vim-ktakata-mq/src/b1f0723e43bcdb97c403b269cb9dff287dbc2149/fix-2746.patch?at=default&fileviewer=file-view-default
(Test is not included, though.)

Bram Moolenaar

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Jun 12, 2018, 11:26:30 AM6/12/18
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Closed #2746 via 07ccf7c.

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