Simplify fseek/ftell.
Another step towards _FILE_OFFSET_BITS=64 support.
Bug: http://b/24807045
Change-Id: I00b83c81a7b108176c4d9437bc32611f73b7e967
diff --git a/tests/stdio_test.cpp b/tests/stdio_test.cpp
index d054bf5..31acfec 100644
--- a/tests/stdio_test.cpp
+++ b/tests/stdio_test.cpp
@@ -1068,3 +1068,28 @@
ASSERT_EQ(-1, fileno(stdin));
ASSERT_EQ(EBADF, errno);
}
+
+TEST(STDIO_TEST, fseek_ftell_unseekable) {
+#if defined(__BIONIC__) // glibc has fopencookie instead.
+ auto read_fn = [](void*, char*, int) { return -1; };
+ FILE* fp = funopen(nullptr, read_fn, nullptr, nullptr, nullptr);
+ ASSERT_TRUE(fp != nullptr);
+
+ // Check that ftell balks on an unseekable FILE*.
+ errno = 0;
+ ASSERT_EQ(-1, ftell(fp));
+ ASSERT_EQ(ESPIPE, errno);
+
+ // SEEK_CUR is rewritten as SEEK_SET internally...
+ errno = 0;
+ ASSERT_EQ(-1, fseek(fp, 0, SEEK_CUR));
+ ASSERT_EQ(ESPIPE, errno);
+
+ // ...so it's worth testing the direct seek path too.
+ errno = 0;
+ ASSERT_EQ(-1, fseek(fp, 0, SEEK_SET));
+ ASSERT_EQ(ESPIPE, errno);
+
+ fclose(fp);
+#endif
+}