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

include/float.h

@@ -0,0 +1,79 @@
+#ifndef VLIBC_FLOAT_H
+#define VLIBC_FLOAT_H
+
+/*
+ * vlibc — <float.h>.
+ *
+ * Characteristics of floating-point types (C23). Every value is derived from
+ * compiler predefined macros (__FLT_MANT_DIG__, __DBL_MAX__, ...), so this
+ * header is fully self-contained. The values reflect the x86_64 SSE2
+ * environment: FLT_RADIX 2, IEC 60559 semantics for float, double and long
+ * double (the 80-bit extended type).
+ *
+ * FLT_ROUNDS is 1 (round to nearest): vlibc does not implement the floating
+ * environment yet, so the default rounding mode is always active. The fenv
+ * todo (#42) is expected to replace this with a live read of the x87/MXCSR
+ * control word.
+ *
+ * This header is ISO C core and is present in every profile.
+ */
+
+#include <vlibc/features.h>
+
+/* Base of all floating-point types. */
+#define FLT_RADIX __FLT_RADIX__
+
+/* Current rounding mode (see the header comment). */
+#define FLT_ROUNDS 1
+
+/* Evaluation method (x86_64: all operations use the type's own range). */
+#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
+
+/* IEC 60559 conformance of each type (C23). */
+#define FLT_IS_IEC_60559 __FLT_IS_IEC_60559__
+#define DBL_IS_IEC_60559 __DBL_IS_IEC_60559__
+#define LDBL_IS_IEC_60559 __LDBL_IS_IEC_60559__
+
+/* float. */
+#define FLT_MANT_DIG __FLT_MANT_DIG__
+#define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
+#define FLT_DIG __FLT_DIG__
+#define FLT_MIN_EXP __FLT_MIN_EXP__
+#define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
+#define FLT_MAX_EXP __FLT_MAX_EXP__
+#define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
+#define FLT_MAX __FLT_MAX__
+#define FLT_NORM_MAX __FLT_NORM_MAX__
+#define FLT_EPSILON __FLT_EPSILON__
+#define FLT_MIN __FLT_MIN__
+#define FLT_TRUE_MIN __FLT_DENORM_MIN__
+
+/* double. */
+#define DBL_MANT_DIG __DBL_MANT_DIG__
+#define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
+#define DBL_DIG __DBL_DIG__
+#define DBL_MIN_EXP __DBL_MIN_EXP__
+#define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
+#define DBL_MAX_EXP __DBL_MAX_EXP__
+#define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
+#define DBL_MAX __DBL_MAX__
+#define DBL_NORM_MAX __DBL_NORM_MAX__
+#define DBL_EPSILON __DBL_EPSILON__
+#define DBL_MIN __DBL_MIN__
+#define DBL_TRUE_MIN __DBL_DENORM_MIN__
+
+/* long double (x86_64: 80-bit extended). */
+#define LDBL_MANT_DIG __LDBL_MANT_DIG__
+#define LDBL_DECIMAL_DIG __LDBL_DECIMAL_DIG__
+#define LDBL_DIG __LDBL_DIG__
+#define LDBL_MIN_EXP __LDBL_MIN_EXP__
+#define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__
+#define LDBL_MAX_EXP __LDBL_MAX_EXP__
+#define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__
+#define LDBL_MAX __LDBL_MAX__
+#define LDBL_NORM_MAX __LDBL_NORM_MAX__
+#define LDBL_EPSILON __LDBL_EPSILON__
+#define LDBL_MIN __LDBL_MIN__
+#define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
+
+#endif /* VLIBC_FLOAT_H */