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137 lines
4.0 KiB
Groff
137 lines
4.0 KiB
Groff
.\" Copyright (c) 2002 Mike Barcroft <mike@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 15, 2002
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.Dt STDINT 7
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.Os
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.Sh NAME
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.Nm stdint
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.Nd "standard integer types"
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.Sh SYNOPSIS
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.In stdint.h
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.Sh DESCRIPTION
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The
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.Aq Pa stdint.h
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header provides source-portable integer types of a specific
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size, smallest memory footprint with a minimum size, fastest
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access speed with a minimum size, largest integer size, and
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those capable of storing pointers.
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.Pp
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The types
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.Vt int8_t ,
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.Vt int16_t ,
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.Vt int32_t ,
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and
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.Vt int64_t
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provide a signed integer type of width 8, 16, 32, or 64 bits, respectively.
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The types
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.Vt uint8_t ,
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.Vt uint16_t ,
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.Vt uint32_t ,
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and
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.Vt uint64_t
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provide an unsigned integer type of width 8, 16, 32, or 64 bits, respectively.
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These integer types should be used when a specific size is required.
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.Pp
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The types
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.Vt int_fast8_t ,
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.Vt int_fast16_t ,
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.Vt int_fast32_t ,
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and
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.Vt int_fast64_t
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provide the fastest signed integer type with a width
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of at least 8, 16, 32, or 64 bits, respectively.
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The types
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.Vt uint_fast8_t ,
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.Vt uint_fast16_t ,
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.Vt uint_fast32_t ,
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and
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.Vt uint_fast64_t
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provide the fastest unsigned integer type with a width
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of at least 8, 16, 32, or 64 bits, respectively.
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These types should be used when access speed is
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paramount, and when a specific size is not required.
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.Pp
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The types
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.Vt int_least8_t ,
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.Vt int_least16_t ,
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.Vt int_least32_t ,
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and
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.Vt int_least64_t
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provide the smallest memory footprint signed integer type with
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a width of at least 8, 16, 32, or 64 bits, respectively.
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The types
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.Vt uint_least8_t ,
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.Vt uint_least16_t ,
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.Vt uint_least32_t ,
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and
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.Vt uint_least64_t
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provide the smallest memory footprint unsigned integer type with
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a width of at least 8, 16, 32, or 64 bits, respectively.
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These types should be used when memory storage is of
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concern, and when a specific size is not required.
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.Pp
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The type
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.Vt intmax_t
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provides a signed integer type large
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enough to hold any other signed integer.
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The type
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.Vt uintmax_t
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provides an unsigned integer type large
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enough to hold any other unsigned integer.
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These types are generally the largest signed and unsigned
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integer types available on a specific architecture.
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.Pp
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The type
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.Vt intptr_t
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provides a signed integer type with the ability to hold a pointer to
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.Vt void ,
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that can later be converted back to a pointer to
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.Vt void .
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.Pp
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The type
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.Vt uintptr_t
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provides an unsigned integer type with the ability to hold a pointer to
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.Vt void ,
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that can later be converted back to a pointer to
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.Vt void .
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.Pp
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Additionally, the
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.Aq Pa stdint.h
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header defines some macros, but none of them are documented here.
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.Sh STANDARDS
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The
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.Aq Pa stdint.h
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header conforms to
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.St -isoC-99
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and
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.St -p1003.1-2001 .
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.Sh HISTORY
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The
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.Aq Pa stdint.h
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header was first introduced in
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.Fx 5.0 .
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