[PATCH v3 1/3] msvcrt/tests: Add tests for check buffering state of standard streams.

[Eric Pouech]

From: Eric Pouech

Signed-off-by: Eric Pouech 
---
 dlls/msvcrt/tests/file.c | 62 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/dlls/msvcrt/tests/file.c b/dlls/msvcrt/tests/file.c
index 1ac6cfe3182..7db5ed981d3 100644
--- a/dlls/msvcrt/tests/file.c
+++ b/dlls/msvcrt/tests/file.c
@@ -3059,6 +3059,67 @@ static void test_ioinfo_flags(void)
     free(tempf);
 }

+static void test_std_stream_buffering(void)
+{
+    int dup_fd, ret, pos;
+    FILE *file;
+    char ch;
+
+    dup_fd = _dup(STDOUT_FILENO);
+    if (dup_fd != -1)
+    {
+        file = freopen("std_stream_test.tmp", "w", stdout);
+        ok(file != NULL, "freopen failed\n");
+
+        ret = fprintf(stdout, "test");
+        pos = _telli64(STDOUT_FILENO);
+
+        fflush(stdout);
+        _dup2(dup_fd, STDOUT_FILENO);
+        close(dup_fd);
+        setvbuf(stdout, NULL, _IONBF, 0);
+
+        ok(ret == 4, "fprintf(stdout) returned %d\n", ret);
+        ok(!pos, "expected stdout to be buffered\n");
+    }
+
+    dup_fd = _dup(STDERR_FILENO);
+    if (dup_fd != -1)
+    {
+        file = freopen("std_stream_test.tmp", "w", stderr);
+        ok(file != NULL, "freopen failed\n");
+
+        ret = fprintf(stderr, "test");
+        ok(ret == 4, "fprintf(stderr) returned %d\n", ret);
+        pos = _telli64(STDERR_FILENO);
+        ok(!pos, "expected stderr to be buffered\n");
+
+        fflush(stderr);
+        _dup2(dup_fd, STDERR_FILENO);
+        close(dup_fd);
+    }
+
+    dup_fd = _dup(STDIN_FILENO);
+    if (dup_fd != -1)
+    {
+        file = freopen("std_stream_test.tmp", "r", stdin);
+        ok(file != NULL, "freopen failed\n");
+
+        ch = 0;
+        ret = fscanf(stdin, "%c", &ch);
+        ok(ret == 1, "fscanf returned %d\n", ret);
+        ok(ch == 't', "ch = 0x%x\n", (unsigned char)ch);
+        pos = _telli64(STDIN_FILENO);
+        ok(pos == 4, "pos = %d\n", pos);
+
+        fflush(stdin);
+        _dup2(dup_fd, STDIN_FILENO);
+        close(dup_fd);
+    }
+
+    ok(DeleteFileA("std_stream_test.tmp"), "DeleteFile failed\n");
+}
+
 START_TEST(file)
 {
     int arg_c;
@@ -3135,6 +3196,7 @@ START_TEST(file)
     test_fopen_hints();
     test_open_hints();
     test_ioinfo_flags();
+    test_std_stream_buffering();

/* Wait for the (_P_NOWAIT) spawned processes to finish to make sure the report
      * file contains lines in the correct order