#ifndef VLIBC_STDDEF_H
#define VLIBC_STDDEF_H

/*
 * vlibc — <stddef.h>.
 *
 * Self-contained definitions of the common C types and macros (C23). Every
 * definition here is derived from compiler builtins, so this header never
 * borrows from a system header.
 *
 * The compatibility profile is exposed by include/vlibc/features.h; it is
 * included here so consumers always see the configured VLIBC_LEVEL.
 */

#include <vlibc/features.h>

/* Integer type of the result of the sizeof operator. */
typedef __SIZE_TYPE__ size_t;

/* Signed integer type of the difference of two pointers. */
typedef __PTRDIFF_TYPE__ ptrdiff_t;

/* Wide character type; a C++ keyword there, so no redefinition. */
#ifndef __cplusplus
typedef __WCHAR_TYPE__ wchar_t;
#endif

/* Type of the null pointer constant nullptr (C23); a C++ keyword there. */
#if !defined(__cplusplus) && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
typedef typeof(nullptr) nullptr_t;
#endif

/* Null pointer constant. */
#define NULL ((void *)0)

/* Offset in bytes of a member from the start of its enclosing object. */
#define offsetof(type, m) __builtin_offsetof(type, m)

/* Mark the following point of the program as unreachable (C23). */
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
#define unreachable() __builtin_unreachable()
#endif

/*
 * An object type whose alignment is as great as that of any supported
 * fundamental type; suitable as the storage type for aligned allocation.
 */
typedef struct
{
    long long vll;
    long double vld;
} max_align_t;

#endif /* VLIBC_STDDEF_H */