vim-patch:8.2.3601: check for overflow in put count does not work well

Problem:    Check for overflow in put count does not work well.
Solution:   Improve the overflow check. (Ozaki Kiichi, closes vim/vim#9102)
https://github.com/vim/vim/commit/fa53722367c3793fda95dac665af74b8651065e9

Add some casts as Nvim uses size_t variables in some places.

We could technically adjust the logic to check for overflow outside of size_t's
range, but it's much easier to just port the patch exactly (also means we can
use the same tests).

v:sizeoflong is N/A, so convert the 64-bit tests to Lua and use the FFI to check
long's size.

1 files changed, 34 insertions, 3 deletions

diff --git a/src/nvim/testdir/test_put.vim b/src/nvim/testdir/test_put.vim
index a71224785a..9f2fc999a7 100644
--- a/src/nvim/testdir/test_put.vim
+++ b/src/nvim/testdir/test_put.vim
@@ -139,10 +139,18 @@ func Test_p_with_count_leaves_mark_at_end()
 endfunc
 
 func Test_very_large_count()
-  throw 'Skipped: v:sizeofint is N/A'
+  new
+  " total put-length (21474837 * 100) brings 32 bit int overflow
+  let @" = repeat('x', 100)
+  call assert_fails('norm 21474837p', 'E1240:')
+  bwipe!
+endfunc
+
+func Test_very_large_count_64bit()
+  throw 'Skipped: v:sizeoflong is N/A'  " use legacy/put_spec.lua instead
 
-  if v:sizeofint != 8
-    throw 'Skipped: only works with 64 bit ints'
+  if v:sizeoflong < 8
+    throw 'Skipped: only works with 64 bit long ints'
   endif
 
   new
@@ -151,6 +159,29 @@ func Test_very_large_count()
   bwipe!
 endfunc
 
+func Test_very_large_count_block()
+  new
+  " total put-length (21474837 * 100) brings 32 bit int overflow
+  call setline(1, repeat('x', 100))
+  exe "norm \<C-V>99ly"
+  call assert_fails('norm 21474837p', 'E1240:')
+  bwipe!
+endfunc
+
+func Test_very_large_count_block_64bit()
+  throw 'Skipped: v:sizeoflong is N/A'  " use legacy/put_spec.lua instead
+
+  if v:sizeoflong < 8
+    throw 'Skipped: only works with 64 bit long ints'
+  endif
+
+  new
+  call setline(1, 'x')
+  exe "norm \<C-V>y"
+  call assert_fails('norm 44444444444444p', 'E1240:')
+  bwipe!
+endfunc
+
 func Test_put_above_first_line()
   new
   let @" = 'text'