#include <stdint.h>
BSD / POSIX › Types & conventions

stdint.h

from ISO/IEC 988:1999 spec
includes: sys/_types/_int8_t.h, sys/_types/_int16_t.h, sys/_types/_int32_t.h, sys/_types/_int64_t.h, _types/_uint8_t.h, _types/_uint16_t.h, _types/_uint32_t.h, _types/_uint64_t.h, sys/_types.h, sys/_types/_intptr_t.h, sys/_types/_uintptr_t.h, _types/_intmax_t.h, _types/_uintmax_t.h
62 macros · 16 typedefs

typedefint_least8_t

7.18.1.2 Minimum-width integer types
typedef int8_t int_least8_t

typedefint_least16_t

typedef int16_t int_least16_t

typedefint_least32_t

typedef int32_t int_least32_t

typedefint_least64_t

typedef int64_t int_least64_t

typedefuint_least8_t

typedef uint8_t uint_least8_t

typedefuint_least16_t

typedef uint16_t uint_least16_t

typedefuint_least32_t

typedef uint32_t uint_least32_t

typedefuint_least64_t

typedef uint64_t uint_least64_t

typedefint_fast8_t

7.18.1.3 Fastest-width integer types
typedef int8_t int_fast8_t

typedefint_fast16_t

typedef int16_t int_fast16_t

typedefint_fast32_t

typedef int32_t int_fast32_t

typedefint_fast64_t

typedef int64_t int_fast64_t

typedefuint_fast8_t

typedef uint8_t uint_fast8_t

typedefuint_fast16_t

typedef uint16_t uint_fast16_t

typedefuint_fast32_t

typedef uint32_t uint_fast32_t

typedefuint_fast64_t

typedef uint64_t uint_fast64_t

macroINT8_C

7.18.4 Macros for integer constants
#define INT8_C(v) (v)

macroINT16_C

#define INT16_C(v) (v)

macroINT32_C

#define INT32_C(v) (v)

macroINT64_C

#define INT64_C(v) (v ## LL)

macroUINT8_C

#define UINT8_C(v) (v)

macroUINT16_C

#define UINT16_C(v) (v)

macroUINT32_C

#define UINT32_C(v) (v ## U)

macroUINT64_C

#define UINT64_C(v) (v ## ULL)

macroINTMAX_C

#define INTMAX_C(v) (v ## L)

macroUINTMAX_C

#define UINTMAX_C(v) (v ## UL)

macroINT8_MAX

7.18.2.1 Limits of exact-width integer types
#define INT8_MAX 127

macroINT16_MAX

#define INT16_MAX 32767

macroINT32_MAX

#define INT32_MAX 2147483647

macroINT64_MAX

#define INT64_MAX 9223372036854775807LL

macroINT8_MIN

#define INT8_MIN -128

macroINT16_MIN

#define INT16_MIN -32768

macroINT32_MIN

Note: the literal "most negative int" cannot be written in C -- the rules in the standard (section 6.4.4.1 in C99) will give it an unsigned type, so INT32_MIN (and the most negative member of any larger signed type) must be written via a constant expression.
#define INT32_MIN (-INT32_MAX-1)

macroINT64_MIN

#define INT64_MIN (-INT64_MAX-1)

macroUINT8_MAX

#define UINT8_MAX 255

macroUINT16_MAX

#define UINT16_MAX 65535

macroUINT32_MAX

#define UINT32_MAX 4294967295U

macroUINT64_MAX

#define UINT64_MAX 18446744073709551615ULL

macroINT_LEAST8_MIN

7.18.2.2 Limits of minimum-width integer types
#define INT_LEAST8_MIN INT8_MIN

macroINT_LEAST16_MIN

#define INT_LEAST16_MIN INT16_MIN

macroINT_LEAST32_MIN

#define INT_LEAST32_MIN INT32_MIN

macroINT_LEAST64_MIN

#define INT_LEAST64_MIN INT64_MIN

macroINT_LEAST8_MAX

#define INT_LEAST8_MAX INT8_MAX

macroINT_LEAST16_MAX

#define INT_LEAST16_MAX INT16_MAX

macroINT_LEAST32_MAX

#define INT_LEAST32_MAX INT32_MAX

macroINT_LEAST64_MAX

#define INT_LEAST64_MAX INT64_MAX

macroUINT_LEAST8_MAX

#define UINT_LEAST8_MAX UINT8_MAX

macroUINT_LEAST16_MAX

#define UINT_LEAST16_MAX UINT16_MAX

macroUINT_LEAST32_MAX

#define UINT_LEAST32_MAX UINT32_MAX

macroUINT_LEAST64_MAX

#define UINT_LEAST64_MAX UINT64_MAX

macroINT_FAST8_MIN

7.18.2.3 Limits of fastest minimum-width integer types
#define INT_FAST8_MIN INT8_MIN

macroINT_FAST16_MIN

#define INT_FAST16_MIN INT16_MIN

macroINT_FAST32_MIN

#define INT_FAST32_MIN INT32_MIN

macroINT_FAST64_MIN

#define INT_FAST64_MIN INT64_MIN

macroINT_FAST8_MAX

#define INT_FAST8_MAX INT8_MAX

macroINT_FAST16_MAX

#define INT_FAST16_MAX INT16_MAX

macroINT_FAST32_MAX

#define INT_FAST32_MAX INT32_MAX

macroINT_FAST64_MAX

#define INT_FAST64_MAX INT64_MAX

macroUINT_FAST8_MAX

#define UINT_FAST8_MAX UINT8_MAX

macroUINT_FAST16_MAX

#define UINT_FAST16_MAX UINT16_MAX

macroUINT_FAST32_MAX

#define UINT_FAST32_MAX UINT32_MAX

macroUINT_FAST64_MAX

#define UINT_FAST64_MAX UINT64_MAX

macroINTPTR_MAX

#define INTPTR_MAX 9223372036854775807L

macroINTPTR_MIN

#define INTPTR_MIN (-INTPTR_MAX-1)

macroUINTPTR_MAX

#define UINTPTR_MAX 18446744073709551615UL

macroINTMAX_MAX

7.18.2.5 Limits of greatest-width integer types
#define INTMAX_MAX INTMAX_C(9223372036854775807)

macroUINTMAX_MAX

#define UINTMAX_MAX UINTMAX_C(18446744073709551615)

macroINTMAX_MIN

#define INTMAX_MIN (-INTMAX_MAX-1)

macroPTRDIFF_MIN

7.18.3 "Other"
#define PTRDIFF_MIN INTMAX_MIN

macroPTRDIFF_MAX

#define PTRDIFF_MAX INTMAX_MAX

macroSIZE_MAX

#define SIZE_MAX UINTPTR_MAX

macroRSIZE_MAX

#define RSIZE_MAX (SIZE_MAX >> 1)

macroWCHAR_MAX

#define WCHAR_MAX __WCHAR_MAX__

macroWCHAR_MIN

WCHAR_MIN should be 0 if wchar_t is an unsigned type and (-WCHAR_MAX-1) if wchar_t is a signed type. Unfortunately, it turns out that -fshort-wchar changes the signedness of the type.
#define WCHAR_MIN (-WCHAR_MAX-1)

macroWINT_MIN

#define WINT_MIN INT32_MIN

macroWINT_MAX

#define WINT_MAX INT32_MAX

macroSIG_ATOMIC_MIN

#define SIG_ATOMIC_MIN INT32_MIN

macroSIG_ATOMIC_MAX

#define SIG_ATOMIC_MAX INT32_MAX