diff options
Diffstat (limited to 'tests/stdio_ext_test.cpp')
| -rw-r--r-- | tests/stdio_ext_test.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tests/stdio_ext_test.cpp b/tests/stdio_ext_test.cpp index 3dbc485a6..950c7ed06 100644 --- a/tests/stdio_ext_test.cpp +++ b/tests/stdio_ext_test.cpp @@ -34,7 +34,13 @@ TEST(stdio_ext, __fbufsize) { FILE* fp = fopen("/proc/version", "r"); + // Initially, there's no buffer in case the first thing you do is disable buffering. + ASSERT_EQ(0U, __fbufsize(fp)); + + // A read forces a buffer to be created. char buf[128]; + fgets(buf, sizeof(buf), fp); + ASSERT_EQ(1024U, __fbufsize(fp)); ASSERT_EQ(0, setvbuf(fp, buf, _IOFBF, 1)); ASSERT_EQ(1U, __fbufsize(fp)); |