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Man Pages
STDINT(7) FreeBSD Miscellaneous Information Manual STDINT(7)

stdint
standard integer types

#include <stdint.h>

The <stdint.h> header provides source-portable integer types of a specific size, smallest memory footprint with a minimum size, fastest access speed with a minimum size, largest integer size, and those capable of storing pointers.
The types int8_t, int16_t, int32_t, and int64_t provide a signed integer type of width 8, 16, 32, or 64 bits, respectively. The types uint8_t, uint16_t, uint32_t, and uint64_t provide an unsigned integer type of width 8, 16, 32, or 64 bits, respectively. These integer types should be used when a specific size is required.
The types int_fast8_t, int_fast16_t, int_fast32_t, and int_fast64_t provide the fastest signed integer type with a width of at least 8, 16, 32, or 64 bits, respectively. The types uint_fast8_t, uint_fast16_t, uint_fast32_t, and uint_fast64_t provide the fastest unsigned integer type with a width of at least 8, 16, 32, or 64 bits, respectively. These types should be used when access speed is paramount, and when a specific size is not required.
The types int_least8_t, int_least16_t, int_least32_t, and int_least64_t provide the smallest memory footprint signed integer type with a width of at least 8, 16, 32, or 64 bits, respectively. The types uint_least8_t, uint_least16_t, uint_least32_t, and uint_least64_t provide the smallest memory footprint unsigned integer type with a width of at least 8, 16, 32, or 64 bits, respectively. These types should be used when memory storage is of concern, and when a specific size is not required.
The type intmax_t provides a signed integer type large enough to hold any other signed integer. The type uintmax_t provides an unsigned integer type large enough to hold any other unsigned integer. These types are generally the largest signed and unsigned integer types available on a specific architecture.
The type intptr_t provides a signed integer type with the ability to hold a pointer to void, that can later be converted back to a pointer to void.
The type uintptr_t provides an unsigned integer type with the ability to hold a pointer to void, that can later be converted back to a pointer to void.
Additionally, the <stdint.h> header defines some macros, but none of them are documented here.

The <stdint.h> header conforms to ISO/IEC 9899:1999 (“ISO C99”) and IEEE Std 1003.1-2001 (“POSIX.1”).

The <stdint.h> header was first introduced in FreeBSD 5.0.
September 15, 2002 FreeBSD 12.0-RELEASE

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