Fix for using ":wundo foo" when foo is an empty file.
diff --git a/src/undo.c b/src/undo.c
index 35fa310..787f625 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -1286,11 +1286,12 @@
}
else
{
- char_u buf[2];
+ char_u buf[2];
+ int len;
- vim_read(fd, buf, 2);
+ len = vim_read(fd, buf, 2);
close(fd);
- if ((buf[0] << 8) + buf[1] != UF_START_MAGIC)
+ if (len < 2 || (buf[0] << 8) + buf[1] != UF_START_MAGIC)
{
if (name != NULL || p_verbose > 0)
smsg((char_u *)_("Will not overwrite, this is not an undo file: %s"),