libc/test/src/string/strerror_r_test.cpp

   1 //===-- Unittests for strerror --------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/string/strerror_r.h"
  10 #include "test/UnitTest/Test.h"
  11
  12 #include <stddef.h>
  13
  14 // This tests the gnu variant of strerror_r (which returns a char*).
  15 TEST(LlvmLibcStrErrorRTest, GnuVariantTests) {
  16   const size_t BUFF_SIZE = 128;
  17   char buffer[BUFF_SIZE];
  18   buffer[0] = '\0';
  19   // If strerror_r returns a constant string, then it shouldn't affect the
  20   // buffer.
  21   ASSERT_STREQ(LIBC_NAMESPACE::strerror_r(0, buffer, BUFF_SIZE), "Success");
  22   ASSERT_EQ(buffer[0], '\0');
  23
  24   // Else it should write the result to the provided buffer.
  25   ASSERT_STREQ(LIBC_NAMESPACE::strerror_r(-1, buffer, BUFF_SIZE),
  26                "Unknown error -1");
  27   ASSERT_STREQ(buffer, "Unknown error -1");
  28 }