Patch 8.1.1812

[Bram Moolenaar]

Patch 8.1.1812
Problem: Reading a truncted undo file hangs Vim.
Solution: Check for reading EOF. (closes #4769)
Files: src/undo.c, src/testdir/test_undo.vim


*** ../vim-8.1.1811/src/undo.c 2019-06-18 22:53:19.018129835 +0200
--- src/undo.c 2019-08-04 18:54:50.701169983 +0200
***************
*** 1317,1322 ****
--- 1317,1328 ----
int len = undo_read_byte(bi);
int what;

+ if (len == EOF)
+ {
+ corruption_error("truncated", file_name);
+ u_free_uhp(uhp);
+ return NULL;
+ }
if (len == 0)
break;
what = undo_read_byte(bi);
*** ../vim-8.1.1811/src/testdir/test_undo.vim 2019-05-19 16:38:53.034327682 +0200
--- src/testdir/test_undo.vim 2019-08-04 18:52:55.366054972 +0200
***************
*** 335,340 ****
--- 335,358 ----
call delete('Xundofile')
endfunc

+ " Check that reading a truncted undo file doesn't hang.
+ func Test_undofile_truncated()
+ new
+ call setline(1, 'hello')
+ set ul=100
+ wundo Xundofile
+ let contents = readfile('Xundofile', 'B')
+
+ " try several sizes
+ for size in range(20, 500, 33)
+ call writefile(contents[0:size], 'Xundofile')
+ call assert_fails('rundo Xundofile', 'E825:')
+ endfor
+
+ bwipe!
+ " call delete('Xundofile')
+ endfunc
+
" Test for undo working properly when executing commands from a register.
" Also test this in an empty buffer.
func Test_cmd_in_reg_undo()
*** ../vim-8.1.1811/src/version.c 2019-08-04 18:13:43.715225398 +0200
--- src/version.c 2019-08-04 18:45:56.497713821 +0200
***************
*** 775,776 ****
--- 775,778 ----
{ /* Add new patch number below this line */
+ /**/
+ 1812,
/**/

--
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/// Bram Moolenaar -- Br...@Moolenaar.net -- http://www.Moolenaar.net \\\
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