James Woodcock : msvcrt: Gets() should handle EOF on stdin gracefully.

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: 1b6d6e50fc6dbd6f01cdbc4d1b23d9cc406caffe
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=1b6d6e50fc6dbd6f01cdbc4d1b23d9cc406caffe

Author: James Woodcock <james_woodcock at yahoo.co.uk>
Date:   Tue Mar  6 22:16:28 2018 -0600

msvcrt: Gets() should handle EOF on stdin gracefully.

Signed-off-by: James Woodcock <james_woodcock at yahoo.co.uk>
Signed-off-by: Piotr Caban <piotr at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
(cherry picked from commit 91c72ce7def5ccec3ea7f759111b0d6fb96d722b)
Signed-off-by: Michael Stefaniuc <mstefani at winehq.org>

---

 dlls/msvcrt/file.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index 7022e48..6b295cf 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -4719,10 +4719,16 @@ char * CDECL MSVCRT_gets(char *buf)
       if(cc != '\r')
           *buf++ = (char)cc;
   }
+  MSVCRT__unlock_file(MSVCRT_stdin);
+
+  if ((cc == MSVCRT_EOF) && (buf_start == buf))
+  {
+    TRACE(":nothing read\n");
+    return NULL;
+  }
   *buf = '\0';
 
   TRACE("got '%s'\n", buf_start);
-  MSVCRT__unlock_file(MSVCRT_stdin);
   return buf_start;
 }
 
@@ -4741,10 +4747,16 @@ MSVCRT_wchar_t* CDECL MSVCRT__getws(MSVCRT_wchar_t* buf)
         if (cc != '\r')
             *buf++ = (MSVCRT_wchar_t)cc;
     }
+    MSVCRT__unlock_file(MSVCRT_stdin);
+
+    if ((cc == MSVCRT_WEOF) && (ws == buf))
+    {
+      TRACE(":nothing read\n");
+      return NULL;
+    }
     *buf = '\0';
 
     TRACE("got %s\n", debugstr_w(ws));
-    MSVCRT__unlock_file(MSVCRT_stdin);
     return ws;
 }