feat(headers): stddef/stdint/stdbool/limits/float/assert + features wiring

include/limits.h

@@ -0,0 +1,70 @@
+#ifndef VLIBC_LIMITS_H
+#define VLIBC_LIMITS_H
+
+/*
+ * vlibc — <limits.h>.
+ *
+ * Sizes of integer types (C23). Every value is derived from compiler
+ * predefined macros (__CHAR_BIT__, __SCHAR_MAX__, __SIZEOF_INT__, ...), so
+ * this header is fully self-contained. char is signed on x86_64; the
+ * __CHAR_UNSIGNED__ branch keeps the header correct if that ever changes.
+ *
+ * This header is ISO C core and is present in every profile.
+ */
+
+#include <vlibc/features.h>
+
+/* Number of bits in the smallest addressable object. */
+#define CHAR_BIT __CHAR_BIT__
+
+/* Maximum number of bytes in a multibyte character (UTF-8 over 32-bit
+ * wchar_t needs at most 4). */
+#define MB_LEN_MAX 4
+
+/* Limits of the plain char types. */
+#define SCHAR_MIN (-__SCHAR_MAX__ - 1)
+#define SCHAR_MAX __SCHAR_MAX__
+#define UCHAR_MAX (__SCHAR_MAX__ * 2 + 1)
+#if defined(__CHAR_UNSIGNED__)
+#define CHAR_MIN 0
+#define CHAR_MAX UCHAR_MAX
+#else
+#define CHAR_MIN SCHAR_MIN
+#define CHAR_MAX SCHAR_MAX
+#endif
+
+/* Limits of the short types. */
+#define SHRT_MIN (-__SHRT_MAX__ - 1)
+#define SHRT_MAX __SHRT_MAX__
+#define USHRT_MAX (__SHRT_MAX__ * 2 + 1)
+
+/* Limits of the int types. */
+#define INT_MIN (-__INT_MAX__ - 1)
+#define INT_MAX __INT_MAX__
+#define UINT_MAX (__INT_MAX__ * 2U + 1U)
+
+/* Limits of the long types (x86_64 LP64: 64-bit). */
+#define LONG_MIN (-__LONG_MAX__ - 1L)
+#define LONG_MAX __LONG_MAX__
+#define ULONG_MAX (__LONG_MAX__ * 2UL + 1UL)
+
+/* Limits of the long long types. */
+#define LLONG_MIN (-__LONG_LONG_MAX__ - 1LL)
+#define LLONG_MAX __LONG_LONG_MAX__
+#define ULLONG_MAX (__LONG_LONG_MAX__ * 2ULL + 1ULL)
+
+/* Width of each integer type, in bits (C23). */
+#define BOOL_WIDTH 1
+#define CHAR_WIDTH __CHAR_BIT__
+#define SCHAR_WIDTH __CHAR_BIT__
+#define UCHAR_WIDTH __CHAR_BIT__
+#define SHRT_WIDTH (__SIZEOF_SHORT__ * __CHAR_BIT__)
+#define USHRT_WIDTH (__SIZEOF_SHORT__ * __CHAR_BIT__)
+#define INT_WIDTH (__SIZEOF_INT__ * __CHAR_BIT__)
+#define UINT_WIDTH (__SIZEOF_INT__ * __CHAR_BIT__)
+#define LONG_WIDTH (__SIZEOF_LONG__ * __CHAR_BIT__)
+#define ULONG_WIDTH (__SIZEOF_LONG__ * __CHAR_BIT__)
+#define LLONG_WIDTH (__SIZEOF_LONG_LONG__ * __CHAR_BIT__)
+#define ULLONG_WIDTH (__SIZEOF_LONG_LONG__ * __CHAR_BIT__)
+
+#endif /* VLIBC_LIMITS_H */