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limits.h: streamline value definitions 

Compilers (at least gcc and clang) already provide max value definitions
for basic types. It makes sense to rely on them to properly support
both 32-bit and 64-bit builds.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This commit is contained in:
Nicolas Pitre 2019-06-20 23:02:46 -04:00 committed by Anas Nashif
parent 1e9a53e548
commit 1b359e6426
1 changed files with 51 additions and 19 deletions
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70
lib/libc/minimal/include/limits.h
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@ -13,9 +13,14 @@
extern "C" {
#endif
#define UCHAR_MAX 0xFF
#define SCHAR_MAX 0x7F
#define SCHAR_MIN (-SCHAR_MAX - 1)
#if __CHAR_BIT__ == 8
#define UCHAR_MAX 0xFFU
#else
#error "unexpected __CHAR_BIT__ value"
#endif
#define SCHAR_MAX __SCHAR_MAX__
#define SCHAR_MIN (-SCHAR_MAX - 1)
#ifdef __CHAR_UNSIGNED__
/* 'char' is an unsigned type */
@ -27,26 +32,53 @@ extern "C" {
#define CHAR_MIN SCHAR_MIN
#endif
#define CHAR_BIT 8
#define LONG_BIT 32
#define WORD_BIT 32
#define CHAR_BIT __CHAR_BIT__
#define LONG_BIT (__SIZEOF_LONG__ * CHAR_BIT)
#define WORD_BIT (__SIZEOF_POINTER__ * CHAR_BIT)
#define INT_MAX 0x7FFFFFFF
#define SHRT_MAX 0x7FFF
#define LONG_MAX 0x7FFFFFFFL
#define LLONG_MAX 0x7FFFFFFFFFFFFFFFLL
#define INT_MAX __INT_MAX__
#define SHRT_MAX __SHRT_MAX__
#define LONG_MAX __LONG_MAX__
#define LLONG_MAX __LONG_LONG_MAX__
#define INT_MIN (-INT_MAX - 1)
#define SHRT_MIN (-SHRT_MAX - 1)
#define LONG_MIN (-LONG_MAX - 1L)
#define LLONG_MIN (-LLONG_MAX - 1LL)
#define INT_MIN (-INT_MAX - 1)
#define SHRT_MIN (-SHRT_MAX - 1)
#define LONG_MIN (-LONG_MAX - 1L)
#define LLONG_MIN (-LLONG_MAX - 1LL)
#define SSIZE_MAX INT_MAX
#if __SIZE_MAX__ == __UINT32_MAX__
#define SSIZE_MAX __INT32_MAX__
#elif __SIZE_MAX__ == __UINT64_MAX__
#define SSIZE_MAX __INT64_MAX__
#else
#error "unexpected __SIZE_MAX__ value"
#endif
#define USHRT_MAX 0xFFFF
#define UINT_MAX 0xFFFFFFFFU
#define ULONG_MAX 0xFFFFFFFFUL
#define ULLONG_MAX 0xFFFFFFFFFFFFFFFFULL
#if __SIZEOF_SHORT__ == 2
#define USHRT_MAX 0xFFFFU
#else
#error "unexpected __SIZEOF_SHORT__ value"
#endif
#if __SIZEOF_INT__ == 4
#define UINT_MAX 0xFFFFFFFFU
#else
#error "unexpected __SIZEOF_INT__ value"
#endif
#if __SIZEOF_LONG__ == 4
#define ULONG_MAX 0xFFFFFFFFUL
#elif __SIZEOF_LONG__ == 8
#define ULONG_MAX 0xFFFFFFFFFFFFFFFFUL
#else
#error "unexpected __SIZEOF_LONG__ value"
#endif
#if __SIZEOF_LONG_LONG__ == 8
#define ULLONG_MAX 0xFFFFFFFFFFFFFFFFULL
#else
#error "unexpected __SIZEOF_LONG_LONG__ value"
#endif
#define PATH_MAX 256