On Friday, July 31, 2015 at 11:07:24 PM UTC+9, h_east wrote:
> Hi itchyny,
>
> 2015-7-26(Sun) 20:46:05 UTC+9 itchyny:
> > Vim warns E749 on switching to a buffer which used to be checked diff.
> >
> > How to reproduce.
> > 1. vim -u NONE -N
> > 2. :e test | diffthis
> > 3. :vnew test2 | diffthis
> > 4. :e test3
> > 5. :buffer #
> >
> > Error message
> > E749: empty buffer
> >
> > What I expect
> > Vim opens the test2 with no error message.
> ...snip...
> > Hope it fixed. Thanks.
>
>
> I can reproduced.
>
> Places that are output E749 is four. In this case it is output in the
> following locations.
>
> fileio.c (in function buf_write())
> 3167 if (buf->b_ml.ml_mfp == NULL)
> 3168 {
> 3169 /* This can happen during startup when there is a stray "w" in
> the
> 3170 * vimrc file. */
> 3171 EMSG(_(e_emptybuf));
> 3172 return FAIL;
> 3173 }
>
> And It's backtrace at this time.
> (gdb) bt
> #0 buf_write (buf=0x1a961b0, fname=0x1a9d3c0 "/tmp/vCVByI3/4", sfname=0x0,
> start=1, end=1, eap=0x0, append=0, forceit=0, reset_changed=0,
> filtering=1)
> at fileio.c:3171
> #1 0x0000000000414743 in diff_write (buf=0x1a961b0,
> fname=0x1a9d3c0 "/tmp/vCVByI3/4") at diff.c:645
> #2 0x0000000000414b21 in ex_diffupdate (eap=0x0) at diff.c:809
> #3 0x00000000004160e3 in diff_check (wp=0x1a921b0, lnum=1) at diff.c:1520
> #4 0x000000000041463b in diff_redraw (dofold=1) at diff.c:618
> #5 0x0000000000413868 in diff_buf_add (buf=0x1a961b0) at diff.c:137
> #6 0x0000000000405d42 in enter_buffer (buf=0x1a961b0) at buffer.c:1542
> #7 0x0000000000405c7d in set_curbuf (buf=0x1a961b0, action=0) at
> buffer.c:1507
> #8 0x0000000000405a16 in do_buffer (action=0, start=1, dir=1, count=2,
> forceit=0) at buffer.c:1403
> #9 0x0000000000404bdb in goto_buffer (eap=0x7ffed7d77d30, start=1, dir=1,
> count=2) at buffer.c:775
> #10 0x000000000046c2fa in ex_buffer (eap=0x7ffed7d77d30) at ex_docmd.c:5494
> #11 0x000000000046795c in do_one_cmd (cmdlinep=0x7ffed7d783c8, sourcing=0,
> cstack=0x7ffed7d77f20, fgetline=0x47ce87 <getexline>, cookie=0x0)
> at ex_docmd.c:2941
> #12 0x00000000004647b7 in do_cmdline (cmdline=0x0,
> fgetline=0x47ce87 <getexline>, cookie=0x0, flags=0) at ex_docmd.c:1133
> #13 0x00000000004ec941 in nv_colon (cap=0x7ffed7d784f0) at normal.c:5405
> #14 0x00000000004e5d8c in normal_cmd (oap=0x7ffed7d785d0, toplevel=1)
>
>
> The fileio.c:3169 comments do not know well to me.. ( ﾟдﾟ)
> However, I have taken measures so as not to come here when the 'diff'.
>
> Please check attached patch.
>
> --
> Best regards,
> Hirohito Higashi (a.k.a h_east)
Thank you so much, h_east-san.
I actually confirmed that your patch fixes the issue.
Bram, what do you think of this bug and the patch of h_east?
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