[musl] [PATCH libc-test 2/3] functional: add mntent test for single-field line

[Alyssa Ross <hi@alyssa.is>]

Glibc only requires a single field to be present in an fstab line to
parse it, and will initialize all other string fields to the empty
string.  This test checks for that behaviour.
---

I'm providing this test as a seperate patch to make it easy to pass on
this test while still accepting the rest, because I'm not sure whether
it's a good thing or not for Musl to allow fstab lines like this, even
though Glibc does.

 src/functional/mntent.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/functional/mntent.c b/src/functional/mntent.c
index 59d816a..caa7d33 100644
--- a/src/functional/mntent.c
+++ b/src/functional/mntent.c
@@ -31,6 +31,18 @@ void test_getmntent_empty(void)
 	ASSERT(endmntent(f) == 1);
 }
 
+void test_getmntent_short(void)
+{
+	char fstab[] = "1\n";
+	FILE *f = fmemopen((void *)fstab, sizeof fstab - 1, "r");
+	if (!f) ERR("fmemopen");
+	struct mntent *m = getmntent(f);
+	ASSERT(m);
+	ASSERT(!strcmp(m->mnt_fsname, "1"));
+	ASSERT(!*m->mnt_dir);
+	ASSERT(endmntent(f) == 1);
+}
+
 void test_getmntent(void)
 {
 	// Checks that the fifth and sixth fields default to 0.
@@ -71,6 +83,7 @@ void test_getmntent_r(void)
 int main(void)
 {
 	test_getmntent_empty();
+	test_getmntent_short();
 	test_getmntent();
 	test_getmntent_r();
 }
-- 
2.32.0