Alexandre Julliard : kernel32: Avoid returning the same name when GetTempFileName is called twice in a short interval .

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 9f7bc109d20a07367875fcd6044dbaad41d9eb7e
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=9f7bc109d20a07367875fcd604...

Author: Alexandre Julliard <julliard(a)winehq.org>
Date:   Thu Jun 24 11:01:56 2010 +0200

kernel32: Avoid returning the same name when GetTempFileName is called twice in a short interval.

---

 dlls/kernel32/path.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/dlls/kernel32/path.c b/dlls/kernel32/path.c
index f0da96c..0e69f91 100644
--- a/dlls/kernel32/path.c
+++ b/dlls/kernel32/path.c
@@ -684,7 +684,10 @@ UINT WINAPI GetTempFileNameW( LPCWSTR path, LPCWSTR prefix, UINT unique, LPWSTR
         /* get a "random" unique number and try to create the file */
         HANDLE handle;
         UINT num = GetTickCount() & 0xffff;
+        static UINT last;
 
+        /* avoid using the same name twice in a short interval */
+        if (last - num < 10) num = last + 1;
         if (!num) num = 1;
         unique = num;
         do
@@ -696,6 +699,7 @@ UINT WINAPI GetTempFileNameW( LPCWSTR path, LPCWSTR prefix, UINT unique, LPWSTR
             {  /* We created it */
                 TRACE("created %s\n", debugstr_w(buffer) );
                 CloseHandle( handle );
+                last = unique;
                 break;
             }
             if (GetLastError() != ERROR_FILE_EXISTS &&