bionic/tests/string_posix_strerror_r_test.cpp

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#undef _GNU_SOURCE
#include <features.h> // Get __BIONIC__ or __GLIBC__ so we can tell what we're using.

#if defined(__GLIBC__)

// At the time of writing, libcxx -- which is dragged in by gtest -- assumes
// declarations from glibc of things that aren't available without __USE_GNU.
// This means we can't even build this test (which is a problem because that
// means it doesn't get included in CTS).
// For glibc 2.15, the symbols in question are:
//   at_quick_exit, quick_exit, vasprintf, strtoll_l, strtoull_l, and strtold_l.

# if __GLIBC_PREREQ(2, 19)
#  error check whether we can build this now...
# endif

#else

#include <string.h>

#include <errno.h>
#include <gtest/gtest.h>

TEST(string, posix_strerror_r) {
  char buf[256];

  // Valid.
  ASSERT_EQ(0, strerror_r(0, buf, sizeof(buf)));
  ASSERT_STREQ("Success", buf);
  ASSERT_EQ(0, strerror_r(1, buf, sizeof(buf)));
  ASSERT_STREQ("Operation not permitted", buf);

  // Invalid.
  ASSERT_EQ(0, strerror_r(-1, buf, sizeof(buf)));
  ASSERT_STREQ("Unknown error -1", buf);
  ASSERT_EQ(0, strerror_r(1234, buf, sizeof(buf)));
  ASSERT_STREQ("Unknown error 1234", buf);

  // Buffer too small.
  errno = 0;
  memset(buf, 0, sizeof(buf));
  ASSERT_EQ(-1, strerror_r(4567, buf, 2));
  ASSERT_STREQ("U", buf);
  // The POSIX strerror_r sets errno to ERANGE (the GNU one doesn't).
  ASSERT_EQ(ERANGE, errno);
}

#endif