feat overflow: added selftest testsuite

Signed-off-by: John Sanpe <sanpeqf@gmail.com>

Author: pixclk

testsuite/CMakeLists.txt

@@ -15,4 +15,5 @@ add_subdirectory(libc)
 add_subdirectory(list)
 add_subdirectory(memalloc)
 add_subdirectory(mpi)
+add_subdirectory(overflow)
 add_subdirectory(slist)

testsuite/overflow/.gitignore

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+/overflow-selftest

testsuite/overflow/CMakeLists.txt

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Copyright(c) 2025 John Sanpe <sanpeqf@gmail.com>
+#
+
+add_executable(overflow-selftest selftest.c)
+target_link_libraries(overflow-selftest bfdev testsuite)
+add_test(overflow-selftest overflow-selftest)
+
+if(${CMAKE_PROJECT_NAME} STREQUAL "bfdev")
+    install(TARGETS
+        overflow-selftest
+        DESTINATION
+        ${CMAKE_INSTALL_DOCDIR}/testsuite
+    )
+endif()

testsuite/overflow/selftest.c

@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2023 John Sanpe <sanpeqf@gmail.com>
+ */
+
+#define MODULE_NAME "overflow-simple"
+#define bfdev_log_fmt(fmt) MODULE_NAME ": " fmt
+
+#include <stddef.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <bfdev/log.h>
+#include <bfdev/overflow.h>
+#include <testsuite.h>
+
+#define TEST(calculate, limit) ({ \
+    bool cond; \
+    cond = bfdev_overflow_##calculate((limit), 1) == (limit); \
+    if (!cond) \
+        failed = true; \
+    cond ? "okay" : "failed"; \
+})
+
+TESTSUITE(
+    "overflow:selftest", NULL, NULL,
+    "overflow selftest"
+) {
+    bool failed;
+
+    failed = false;
+    bfdev_log_info("add char: %s\n", TEST(add, (char)SCHAR_MAX));
+    bfdev_log_info("add short: %s\n", TEST(add, (short)SHRT_MAX));
+    bfdev_log_info("add int: %s\n", TEST(add, (int)INT_MAX));
+    bfdev_log_info("add long: %s\n", TEST(add, (long)LONG_MAX));
+    bfdev_log_info("add long long: %s\n", TEST(add, (long long)LLONG_MAX));
+
+    bfdev_log_info("add unsigned char: %s\n", TEST(add, (unsigned char)UCHAR_MAX));
+    bfdev_log_info("add unsigned short: %s\n", TEST(add, (unsigned short)USHRT_MAX));
+    bfdev_log_info("add unsigned int: %s\n", TEST(add, (unsigned int)UINT_MAX));
+    bfdev_log_info("add unsigned long: %s\n", TEST(add, (unsigned long)ULONG_MAX));
+    bfdev_log_info("add unsigned long long: %s\n", TEST(add, (unsigned long long)ULLONG_MAX));
+
+    bfdev_log_info("sub char: %s\n", TEST(sub, (char)SCHAR_MIN));
+    bfdev_log_info("sub short: %s\n", TEST(sub, (short)SHRT_MIN));
+    bfdev_log_info("sub int: %s\n", TEST(sub, (int)INT_MIN));
+    bfdev_log_info("sub long: %s\n", TEST(sub, (long)LONG_MIN));
+    bfdev_log_info("sub long long: %s\n", TEST(sub, (long long)LLONG_MIN));
+
+    bfdev_log_info("sub unsigned char: %s\n", TEST(sub, (unsigned char)0));
+    bfdev_log_info("sub unsigned short: %s\n", TEST(sub, (unsigned short)0));
+    bfdev_log_info("sub unsigned int: %s\n", TEST(sub, (unsigned int)0));
+    bfdev_log_info("sub unsigned long: %s\n", TEST(sub, (unsigned long)0));
+    bfdev_log_info("sub unsigned long long: %s\n", TEST(sub, (unsigned long long)0));
+
+    if (failed)
+        return -BFDEV_EFAULT;
+
+    return -BFDEV_ENOERR;
+}