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libc: minimal: add INTn_C macros to stdint.h

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Macros like INT64_C(x) convert x to a constant integral expression,
i.e. one that can be used in preprocessor code.  Implement wrappers
that use the GNUC intrinsics to perform the translation.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
This commit is contained in:
Peter Bigot 2020-12-07 10:08:55 -06:00 • committed by Anas Nashif
commit ee7c9f7fe8
2 changed files with 32 additions and 0 deletions
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18
lib/libc/minimal/include/stdint.h
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@ -74,6 +74,24 @@ typedef __UINT_LEAST64_TYPE__ uint_least64_t;
typedef __INTPTR_TYPE__ intptr_t;
typedef __UINTPTR_TYPE__ uintptr_t;
#ifdef __GNUC__
/* These macros must produce constant integer expressions, which can't
* be done in the preprocessor (casts aren't allowed). Defer to the
* GCC internal functions where they're available.
*/
#define INT8_C(_v) __INT8_C(_v)
#define INT16_C(_v) __INT16_C(_v)
#define INT32_C(_v) __INT32_C(_v)
#define INT64_C(_v) __INT64_C(_v)
#define INTMAX_C(_v) __INTMAX_C(_v)
#define UINT8_C(_v) __UINT8_C(_v)
#define UINT16_C(_v) __UINT16_C(_v)
#define UINT32_C(_v) __UINT32_C(_v)
#define UINT64_C(_v) __UINT64_C(_v)
#define UINTMAX_C(_v) __UINTMAX_C(_v)
#endif /* __GNUC__ */
#ifdef __cplusplus
}
#endif

14
tests/lib/c_lib/src/main.c
View file

@ -123,6 +123,20 @@ void test_stdint(void)
{
zassert_true((unsigned_int + unsigned_byte + 1u == 0U), NULL);
#if (UINT8_C(1) == 1) \
&& (INT8_C(-1) == -1) \
&& (UINT16_C(2) == 2) \
&& (INT16_C(-2) == -2) \
&& (UINT32_C(4) == 4) \
&& (INT32_C(-4) == -4) \
&& (UINT64_C(8) == 8) \
&& (INT64_C(-8) == -8) \
&& (UINTMAX_C(11) == 11) \
&& (INTMAX_C(-11) == -11)
zassert_true(true, NULL);
#else
zassert_true(false, "const int expr values ...");
#endif
}
/*