1.\" $NetBSD: stdint.3,v 1.6 2011/08/09 18:11:37 jruoho Exp $ 2.\" 3.\" Copyright (c) 2002 Mike Barcroft <mike@FreeBSD.org> 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" $FreeBSD: src/share/man/man7/stdint.7,v 1.5 2003/09/08 19:57:21 ru Exp $ 28.\" 29.Dd August 9, 2011 30.Dt STDINT 3 31.Os 32.Sh NAME 33.Nm stdint 34.Nd standard integer types 35.Sh SYNOPSIS 36.In stdint.h 37.Sh DESCRIPTION 38The 39.In stdint.h 40header provides source-portable integer types of a specific 41size, smallest memory footprint with a minimum size, fastest 42access speed with a minimum size, largest integer size, and 43those capable of storing pointers. 44.Pp 45The types 46.Vt int8_t , 47.Vt int16_t , 48.Vt int32_t , 49and 50.Vt int64_t 51provide a signed integer type of width 8, 16, 32, or 64 bits, respectively. 52The types 53.Vt uint8_t , 54.Vt uint16_t , 55.Vt uint32_t , 56and 57.Vt uint64_t 58provide an unsigned integer type of width 8, 16, 32, or 64 bits, respectively. 59These integer types should be used when a specific size is required. 60.Pp 61The types 62.Vt int_fast8_t , 63.Vt int_fast16_t , 64.Vt int_fast32_t , 65and 66.Vt int_fast64_t 67provide the fastest signed integer type with a width 68of at least 8, 16, 32, or 64 bits, respectively. 69The types 70.Vt uint_fast8_t , 71.Vt uint_fast16_t , 72.Vt uint_fast32_t , 73and 74.Vt uint_fast64_t 75provide the fastest unsigned integer type with a width 76of at least 8, 16, 32, or 64 bits, respectively. 77These types should be used when access speed is 78paramount, and when a specific size is not required. 79.Pp 80The types 81.Vt int_least8_t , 82.Vt int_least16_t , 83.Vt int_least32_t , 84and 85.Vt int_least64_t 86provide the smallest memory footprint signed integer type with 87a width of at least 8, 16, 32, or 64 bits, respectively. 88The types 89.Vt uint_least8_t , 90.Vt uint_least16_t , 91.Vt uint_least32_t , 92and 93.Vt uint_least64_t 94provide the smallest memory footprint unsigned integer type with 95a width of at least 8, 16, 32, or 64 bits, respectively. 96These types should be used when memory storage is of 97concern, and when a specific size is not required. 98.Pp 99The type 100.Vt intmax_t 101provides a signed integer type large 102enough to hold any other signed integer. 103The type 104.Vt uintmax_t 105provides an unsigned integer type large 106enough to hold any other unsigned integer. 107These types are generally the largest signed and unsigned 108integer types available on a specific architecture. 109.Pp 110The type 111.Vt intptr_t 112provides a signed integer type with the ability to hold a pointer to 113.Vt void , 114that can later be converted back to a pointer to 115.Vt void . 116.Pp 117The type 118.Vt uintptr_t 119provides an unsigned integer type with the ability to hold a pointer to 120.Vt void , 121that can later be converted back to a pointer to 122.Vt void . 123.Sh SEE ALSO 124.Xr inttypes 3 , 125.Xr limits 3 , 126.Xr stdbool 3 , 127.Xr unistd 3 128.Sh STANDARDS 129The 130.In stdint.h 131header conforms to 132.St -isoC-99 133and 134.St -p1003.1-2001 . 135.Sh HISTORY 136The 137.In stdint.h 138header was first introduced in 139.Nx 1.6 . 140