Freestanding headers

kernel/std/include/stddef.h

@@ -0,0 +1,51 @@
+/* Copyright (C) 2022-2025 Mintsuki and contributors.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef __FREESTND_C_HDRS_STDDEF_H
+#define __FREESTND_C_HDRS_STDDEF_H 1
+
+typedef __SIZE_TYPE__ size_t;
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+
+#ifndef __cplusplus
+typedef __WCHAR_TYPE__ wchar_t;
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 201710L
+typedef typeof(nullptr) nullptr_t;
+#endif
+
+#endif
+
+#ifdef __cplusplus
+typedef decltype(nullptr) nullptr_t;
+#endif
+
+#undef NULL
+#ifndef __cplusplus
+#  define NULL ((void *)0)
+#else
+#  define NULL 0
+#endif
+
+#undef offsetof
+#define offsetof(s, m) __builtin_offsetof(s, m)
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 201710L
+#  undef unreachable
+#  define unreachable() __builtin_unreachable()
+
+#  define __STDC_VERSION_STDDEF_H__ 202311L
+#endif
+
+#endif