[PATCH] msvcrt:msvcrt_get_flags: Fix bug 51846 - fopen(..., "wx")

[Ted Lyngmo]

This fixes bug 51846: Standard library call fopen(..., "wx") not
recognized - causes destruction of data.

Signed-off-by: Ted Lyngmo <ted at lyncon.se>
---
 dlls/msvcrt/file.c       |  3 +++
 dlls/msvcrt/tests/file.c | 27 +++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index b0eeaf2a351..355638fa783 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -1586,6 +1586,9 @@ static int msvcrt_get_flags(const wchar_t* mode, int *open_flags, int* stream_fl
       *open_flags |=  _O_TEXT;
       *open_flags &= ~_O_BINARY;
       break;
+    case 'x':
+      *open_flags |= _O_EXCL;
+      break;
     case 'D':
       *open_flags |= _O_TEMPORARY;
       break;
diff --git a/dlls/msvcrt/tests/file.c b/dlls/msvcrt/tests/file.c
index 1d74c6135b8..3b96be58126 100644
--- a/dlls/msvcrt/tests/file.c
+++ b/dlls/msvcrt/tests/file.c
@@ -110,6 +110,32 @@ static void test_filbuf( void )
     unlink("filbuf.tst");
 }
 
+static void test_fopen_exclusive( void )
+{
+    static const char * const testfile = "fileexcl.tst";
+    FILE *fp;
+
+    fp = fopen(testfile, "wx");
+    ok(fp != NULL, "creating file with mode wx failed\n");
+    if(fp) fclose(fp);
+
+    fp = fopen(testfile, "wx");
+    ok(fp == NULL, "overwrote existing file with mode wx\n");
+    if(fp) fclose(fp);
+
+    unlink(testfile);
+
+    fp = fopen(testfile, "w+x");
+    ok(fp != NULL, "creating file with mode w+x failed\n");
+    if(fp) fclose(fp);
+
+    fp = fopen(testfile, "w+x");
+    ok(fp == NULL, "overwrote existing file with mode w+x\n");
+    if(fp) fclose(fp);
+
+    unlink(testfile);
+}
+
 static void test_fdopen( void )
 {
     static const char buffer[] = {0,1,2,3,4,5,6,7,8,9};
@@ -2841,6 +2867,7 @@ START_TEST(file)
 
     /* testing stream I/O */
     test_filbuf();
+    test_fopen_exclusive();
     test_fdopen();
     test_fopen_fclose_fcloseall();
     test_fopen_s();
-- 
2.31.1