stdint(7)
NAME
stdint - standard integer types
SYNOPSIS
#include <stdint.h>
DESCRIPTION
- The #include <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 un - signed integer
type with a width of at least 8, 16, 32, or 64 bits, respec - tively. 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 re - quired.
- The type intmax_t provides a signed integer type large
- enough to hold any
other signed integer. The type uintmax_t provides an un - signed 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 #include <stdint.h> header defines some macros, but none of them are documented
- here.
STANDARDS
The #include <stdint.h>
header conforms to ISO/IEC 9899:1999 (``ISO C99'') and .
HISTORY
- The #include <stdint.h>
header was first introduced in FreeBSD 5.0. - BSD September 15, 2002