patch 7.4.1975
Problem: On MS-Windows large files (> 2Gbyte) cause problems.
Solution: Use "off_T" instead of "off_t". Use "stat_T" instead of "struct
stat". Use 64 bit system functions if available. (Ken Takata)
diff --git a/src/testdir/test_largefile.vim b/src/testdir/test_largefile.vim
new file mode 100644
index 0000000..ea2b8ff
--- /dev/null
+++ b/src/testdir/test_largefile.vim
@@ -0,0 +1,30 @@
+" Tests for large files
+" This is only executed manually: "make test_largefile".
+" This is not run as part of "make test".
+
+func Test_largefile()
+ let fname = 'Xlarge.txt'
+
+ call delete(fname)
+ exe "e" fname
+ " Make sure that a line break is 1 byte (LF).
+ set ff=unix
+ set undolevels=-1
+ " Input 99 'A's. The line becomes 100 bytes including a line break.
+ exe "normal 99iA\<Esc>"
+ yank
+ " Put 39,999,999 times. The file becomes 4,000,000,000 bytes.
+ normal 39999999p
+ " Moving around in the file randomly.
+ normal G
+ normal 10%
+ normal 90%
+ normal 50%
+ normal gg
+ w
+ " Check if the file size is larger than 2^31 - 1 bytes.
+ " Note that getfsize() returns -2 if a Number is 32 bits.
+ let fsize=getfsize(fname)
+ call assert_true(fsize > 2147483647 || fsize == -2)
+ "call delete(fname)
+endfunc