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uchar.h: add char8_t

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A type similar to char16 and char32_t, for compliance with C23.
The related type atomic_char8_t is added to stdatomic.h.
As char8_t is always unsigned char, I've skipped adding __char8_t.
This can be added, too, if desired.

Reviewed by:	imp
Approved by:	markj (mentor)
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D53952
This commit is contained in:
Robert Clausecker committed 2025-11-28 16:19:53 +01:00
1 parent 5da388c633
commit f0e541118c
2 files changed
+11
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include/uchar.h
+5
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@@ -32,6 +32,11 @@
#include <sys/cdefs.h>
#include <sys/_types.h>
#if __ISO_C_VISIBLE >= 2023 && !defined(_CHAR8_T_DECLARED)
typedef unsigned char char8_t;
#define _CHAR8_T_DECLARED
#endif
#ifndef _CHAR16_T_DECLARED
typedef __char16_t char16_t;
#define _CHAR16_T_DECLARED
sys/sys/stdatomic.h
+6
View File
@@ -54,6 +54,9 @@
#ifdef __GCC_ATOMIC_CHAR_LOCK_FREE
#define ATOMIC_CHAR_LOCK_FREE __GCC_ATOMIC_CHAR_LOCK_FREE
#endif
#if __ISO_C_VISIBLE >= 2023 && defined(__GCC_ATOMIC_CHAR8_T_LOCK_FREE)
#define ATOMIC_CHAR8_T_LOCK_FREE __GCC_ATOMIC_CHAR8_T_LOCK_FREE
#endif
#ifdef __GCC_ATOMIC_CHAR16_T_LOCK_FREE
#define ATOMIC_CHAR16_T_LOCK_FREE __GCC_ATOMIC_CHAR16_T_LOCK_FREE
#endif
@@ -199,6 +202,9 @@ typedef _Atomic(long) atomic_long;
typedef _Atomic(unsigned long) atomic_ulong;
typedef _Atomic(long long) atomic_llong;
typedef _Atomic(unsigned long long) atomic_ullong;
#if __ISO_C_VISIBLE >= 2023
typedef _Atomic(unsigned char) atomic_char8_t;
#endif
typedef _Atomic(__char16_t) atomic_char16_t;
typedef _Atomic(__char32_t) atomic_char32_t;
typedef _Atomic(___wchar_t) atomic_wchar_t;