[musl] [C23 divers headers 02/17] C23: Add the *_WIDTH macros to stdint.h

[Jens Gustedt <Jens.Gustedt@inria.fr>]

This basically doubles the strategies as are already in place to
determine the correct values.

All this generation of these macros would merrit some refactoring.

We also set the include guard to the macro name requested by C23, only
that we do not yet use the final version number. This should be done
once it is agreed that this part of the headers are C23 compliant.
---
 include/stdint.h | 77 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 75 insertions(+), 2 deletions(-)

diff --git a/include/stdint.h b/include/stdint.h
index a2968197..1f68b3bb 100644
--- a/include/stdint.h
+++ b/include/stdint.h
@@ -1,5 +1,5 @@
-#ifndef _STDINT_H
-#define _STDINT_H
+#ifndef __STDC_VERSION_STDINT_H__
+#define __STDC_VERSION_STDINT_H__ 201711L
 
 #define __NEED_int8_t
 #define __NEED_int16_t
@@ -35,6 +35,11 @@ typedef uint16_t uint_least16_t;
 typedef uint32_t uint_least32_t;
 typedef uint64_t uint_least64_t;
 
+#define INT8_WIDTH   8
+#define INT16_WIDTH  16
+#define INT32_WIDTH  32
+#define INT64_WIDTH  64
+
 #define INT8_MIN   (-1-0x7f)
 #define INT16_MIN  (-1-0x7fff)
 #define INT32_MIN  (-1-0x7fffffff)
@@ -45,14 +50,27 @@ typedef uint64_t uint_least64_t;
 #define INT32_MAX  (0x7fffffff)
 #define INT64_MAX  (0x7fffffffffffffff)
 
+#define UINT8_WIDTH   8
+#define UINT16_WIDTH  16
+#define UINT32_WIDTH  32
+#define UINT64_WIDTH  64
+
 #define UINT8_MAX  (0xff)
 #define UINT16_MAX (0xffff)
 #define UINT32_MAX (0xffffffffu)
 #define UINT64_MAX (0xffffffffffffffffu)
 
+#define INT_FAST8_WIDTH   8
+#define INT_FAST64_WIDTH  64
+
 #define INT_FAST8_MIN   INT8_MIN
 #define INT_FAST64_MIN  INT64_MIN
 
+#define INT_LEAST8_WIDTH   8
+#define INT_LEAST16_WIDTH  16
+#define INT_LEAST32_WIDTH  32
+#define INT_LEAST64_WIDTH  64
+
 #define INT_LEAST8_MIN   INT8_MIN
 #define INT_LEAST16_MIN  INT16_MIN
 #define INT_LEAST32_MIN  INT32_MIN
@@ -66,21 +84,36 @@ typedef uint64_t uint_least64_t;
 #define INT_LEAST32_MAX  INT32_MAX
 #define INT_LEAST64_MAX  INT64_MAX
 
+#define UINT_FAST8_WIDTH   8
+#define UINT_FAST64_WIDTH  64
+
 #define UINT_FAST8_MAX  UINT8_MAX
 #define UINT_FAST64_MAX UINT64_MAX
 
+#define UINT_LEAST8_WIDTH   8
+#define UINT_LEAST16_WIDTH  16
+#define UINT_LEAST32_WIDTH  32
+#define UINT_LEAST64_WIDTH  64
+
 #define UINT_LEAST8_MAX  UINT8_MAX
 #define UINT_LEAST16_MAX UINT16_MAX
 #define UINT_LEAST32_MAX UINT32_MAX
 #define UINT_LEAST64_MAX UINT64_MAX
 
+#define INTMAX_WIDTH 64
+#define UINTMAX_WIDTH 64
+
 #define INTMAX_MIN  INT64_MIN
 #define INTMAX_MAX  INT64_MAX
 #define UINTMAX_MAX UINT64_MAX
 
+#define WINT_WIDTH 32
+
 #define WINT_MIN 0U
 #define WINT_MAX UINT32_MAX
 
+#define WCHAR_WIDTH 32
+
 #if L'\0'-1 > 0
 #define WCHAR_MAX (0xffffffffu+L'\0')
 #define WCHAR_MIN (0+L'\0')
@@ -89,6 +122,8 @@ typedef uint64_t uint_least64_t;
 #define WCHAR_MIN (-1-0x7fffffff+L'\0')
 #endif
 
+#define SIG_ATOMIC_WIDTH 32
+
 #define SIG_ATOMIC_MIN  INT32_MIN
 #define SIG_ATOMIC_MAX  INT32_MAX
 
@@ -103,15 +138,53 @@ typedef uint64_t uint_least64_t;
 #define UINT32_C(c) c ## U
 
 #if UINTPTR_MAX == UINT64_MAX
+#define INTPTR_WIDTH 64
+#define UINTPTR_WIDTH 64
 #define INT64_C(c) c ## L
 #define UINT64_C(c) c ## UL
 #define INTMAX_C(c)  c ## L
 #define UINTMAX_C(c) c ## UL
 #else
+#define INTPTR_WIDTH 32
+#define UINTPTR_WIDTH 32
 #define INT64_C(c) c ## LL
 #define UINT64_C(c) c ## ULL
 #define INTMAX_C(c)  c ## LL
 #define UINTMAX_C(c) c ## ULL
 #endif
 
+#if UINT_FAST16_MAX == UINT32_MAX
+#define INT_FAST16_WIDTH 32
+#define UINT_FAST16_WIDTH 32
+#else
+#define INT_FAST16_WIDTH 16
+#define UINT_FAST16_WIDTH 16
+#endif
+
+#if UINT_FAST32_MAX == UINT64_MAX
+#define INT_FAST32_WIDTH 64
+#define UINT_FAST32_WIDTH 64
+#else
+#define INT_FAST32_WIDTH 32
+#define UINT_FAST32_WIDTH 32
+#endif
+
+#if PTRDIFF_MAX == INT64_MAX
+#define PTRDIFF_WIDTH 64
+#else
+#define PTRDIFF_WIDTH 32
+#endif
+
+#if SIZE_MAX == UINT64_MAX
+#define SIZE_WIDTH 64
+#else
+#define SIZE_WIDTH 32
+#endif
+
+// Enable support for _BitInt(N) types, if that comes not from the
+// compiler directly.
+#if (__STDC_VERSION__ >= 201900L) && !BITINT_MAXWIDTH && __BITINT_MAXWIDTH__
+#define BITINT_MAXWIDTH __BITINT_MAXWIDTH__
+#endif
+
 #endif
-- 
2.34.1