tests: lib: c_libc: tests for strerror, strerror_r
Add tests for strerror() and strerror_r()
Signed-off-by: Christopher Friedt <cfriedt@fb.com>
diff --git a/tests/lib/c_lib/Kconfig b/tests/lib/c_lib/Kconfig
new file mode 100644
index 0000000..4b04d89
--- /dev/null
+++ b/tests/lib/c_lib/Kconfig
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2022 Meta
+
+mainmenu "Strerror test parameters"
+
+source "Kconfig.zephyr"
+
+config MINIMAL_LIBC_DISABLE_STRING_ERROR_TABLE
+ depends on MINIMAL_LIBC
+ bool
+ default y if !MINIMAL_LIBC_STRING_ERROR_TABLE
+ default n if MINIMAL_LIBC_STRING_ERROR_TABLE
+ help
+ This option is only here to simplify conditional expressions
+ in test_strerror.c rather than inverting logic for the
+ global MINIMAL_LIBC_STRING_ERROR_TABLE option.
diff --git a/tests/lib/c_lib/src/test_strerror.c b/tests/lib/c_lib/src/test_strerror.c
new file mode 100644
index 0000000..d3b8e33
--- /dev/null
+++ b/tests/lib/c_lib/src/test_strerror.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2022 Meta
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <errno.h>
+#include <string.h>
+
+#include <ztest.h>
+
+ZTEST(test_c_lib, test_strerror)
+{
+ const char *expected;
+ const char *actual;
+
+ errno = 4242;
+ if (IS_ENABLED(CONFIG_MINIMAL_LIBC_DISABLE_STRING_ERROR_TABLE)) {
+ expected = "";
+ actual = strerror(EINVAL);
+
+ zassert_equal(0, strcmp("", strerror(EINVAL)), "");
+ } else {
+ expected = "Invalid argument";
+ actual = strerror(EINVAL);
+
+ zassert_equal(0, strcmp(expected, actual),
+ "mismatch: exp: %s act: %s", expected, actual);
+ }
+
+ /* do not change errno on success */
+ zassert_equal(4242, errno, "");
+
+ /* consistent behaviour w.r.t. errno with invalid input */
+ errno = 0;
+ expected = "";
+ actual = strerror(-42);
+ zassert_equal(0, strcmp(expected, actual), "mismatch: exp: %s act: %s",
+ expected, actual);
+ actual = strerror(4242);
+ zassert_equal(0, strcmp(expected, actual), "mismatch: exp: %s act: %s",
+ expected, actual);
+ /* do not change errno on failure (for consistence) */
+ zassert_equal(0, errno, "");
+
+ /* consistent behaviour for "Success" */
+ if (!IS_ENABLED(CONFIG_MINIMAL_LIBC_DISABLE_STRING_ERROR_TABLE)) {
+ expected = "Success";
+ actual = strerror(0);
+ zassert_equal(0, strcmp(expected, actual),
+ "mismatch: exp: %s act: %s", expected, actual);
+ }
+}
+
+ZTEST(test_c_lib, test_strerror_r)
+{
+ const char *expected;
+ char actual[] = {'1', 'n', 'v', 'a', '1', '1', 'd', ' ', 'a',
+ '2', 'g', 'u', 'm', '3', 'n', '7', 0x00, 0x42};
+ static const size_t n = sizeof(actual);
+
+ if (IS_ENABLED(CONFIG_NEWLIB_LIBC) || IS_ENABLED(CONFIG_ARCMWDT_LIBC)) {
+ /* FIXME: Please see Issue #46846 */
+ ztest_test_skip();
+ }
+
+ errno = 4242;
+ if (IS_ENABLED(CONFIG_MINIMAL_LIBC_DISABLE_STRING_ERROR_TABLE)) {
+ expected = "";
+ zassert_equal(0, strerror_r(EINVAL, actual, n), "");
+ zassert_equal(0, strncmp(expected, actual, n),
+ "mismatch: exp: %s act: %s", expected, actual);
+ } else {
+ expected = "Invalid argument";
+ zassert_equal(0, strerror_r(EINVAL, actual, n), "%d",
+ strerror_r(EINVAL, actual, n));
+ zassert_equal(0, strncmp(expected, actual, n),
+ "mismatch: exp: %s act: %s", expected, actual);
+ /* only the necessary buffer area is written */
+ zassert_equal(0x42, (uint8_t)actual[n - 1],
+ "exp: %02x act: %02x", 0x42,
+ (uint8_t)actual[n - 1]);
+
+ zassert_equal(ERANGE, strerror_r(EINVAL, actual, 0), "");
+ }
+
+ /* do not change errno on success */
+ zassert_equal(4242, errno, "");
+
+ errno = 0;
+ zassert_equal(EINVAL, strerror_r(-42, actual, n), "");
+ zassert_equal(EINVAL, strerror_r(4242, actual, n), "");
+ /* do not change errno on failure */
+ zassert_equal(0, errno, "");
+}
diff --git a/tests/lib/c_lib/testcase.yaml b/tests/lib/c_lib/testcase.yaml
index 8c7ffa3..f63f4d9 100644
--- a/tests/lib/c_lib/testcase.yaml
+++ b/tests/lib/c_lib/testcase.yaml
@@ -1,9 +1,19 @@
+common:
+ tags: clib
+ platform_exclude: native_posix native_posix_64 nrf52_bsim
tests:
libraries.libc:
- tags: clib ignore_faults
- platform_exclude: native_posix native_posix_64 nrf52_bsim
+ tags: ignore_faults
libraries.picolibc:
filter: CONFIG_PICOLIBC_SUPPORTED
- tags: clib picolibc ignore_faults
+ tags: picolibc ignore_faults
extra_configs:
- CONFIG_PICOLIBC=y
+ libraries.libc.minimal.strerror_table:
+ extra_configs:
+ - CONFIG_MINIMAL_LIBC=y
+ - CONFIG_MINIMAL_LIBC_STRING_ERROR_TABLE=y
+ libraries.libc.minimal.no_strerror_table:
+ extra_configs:
+ - CONFIG_MINIMAL_LIBC=y
+ - CONFIG_MINIMAL_LIBC_STRING_ERROR_TABLE=n
