From: Ted Lyngmo Subject: [PATCH] ucrtbase: Add support for x mode in fopen Message-Id: <20211007194107.2456349-1-ted@lyncon.se> Date: Thu, 7 Oct 2021 21:41:07 +0200 This fixes bug 51846: Standard library call fopen(..., "wx") not recognized - causes destruction of data. Signed-off-by: Ted Lyngmo --- dlls/msvcrt/file.c | 5 +++++ dlls/ucrtbase/tests/misc.c | 25 +++++++++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c index b0eeaf2a351..3b36d087822 100644 --- a/dlls/msvcrt/file.c +++ b/dlls/msvcrt/file.c @@ -1586,6 +1586,11 @@ static int msvcrt_get_flags(const wchar_t* mode, int *open_flags, int* stream_fl *open_flags |= _O_TEXT; *open_flags &= ~_O_BINARY; break; +#if _MSVCR_VER>=140 + case 'x': + *open_flags |= _O_EXCL; + break; +#endif case 'D': *open_flags |= _O_TEMPORARY; break; diff --git a/dlls/ucrtbase/tests/misc.c b/dlls/ucrtbase/tests/misc.c index c2b6dc18d28..c16307ecccb 100644 --- a/dlls/ucrtbase/tests/misc.c +++ b/dlls/ucrtbase/tests/misc.c @@ -1539,6 +1539,30 @@ static void test_fenv(void) ok(!except, "expected 0, got %lx\n", except); } +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"); + fclose(fp); + + fp = fopen(testfile, "wx"); + ok(fp == NULL, "overwrote existing file with mode wx\n"); + + unlink(testfile); + + fp = fopen(testfile, "w+x"); + ok(fp != NULL, "creating file with mode w+x failed\n"); + fclose(fp); + + fp = fopen(testfile, "w+x"); + ok(fp == NULL, "overwrote existing file with mode w+x\n"); + + unlink(testfile); +} + START_TEST(misc) { int arg_c; @@ -1580,4 +1604,5 @@ START_TEST(misc) test_clock(); test_thread_storage(); test_fenv(); + test_fopen_exclusive(); } -- 2.31.1