1.\" Copyright (c) 2002 Mike Barcroft <mike@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD: src/share/man/man7/stdint.7,v 1.5 2003/09/08 19:57:21 ru Exp $ 26.\" 27.Dd March 22, 2009 28.Dt STDINT 7 29.Os 30.Sh NAME 31.Nm stdint 32.Nd "standard integer types" 33.Sh SYNOPSIS 34.In stdint.h 35.Sh DESCRIPTION 36The 37.In stdint.h 38header provides source-portable integer types of a specific 39size, smallest memory footprint with a minimum size, fastest 40access speed with a minimum size, largest integer size, and 41those capable of storing pointers. 42.Pp 43The types 44.Vt int8_t , 45.Vt int16_t , 46.Vt int32_t , 47and 48.Vt int64_t 49provide a signed integer type of width 8, 16, 32, or 64 bits, respectively. 50The types 51.Vt uint8_t , 52.Vt uint16_t , 53.Vt uint32_t , 54and 55.Vt uint64_t 56provide an unsigned integer type of width 8, 16, 32, or 64 bits, respectively. 57These integer types should be used when a specific size is required. 58.Pp 59The types 60.Vt int_fast8_t , 61.Vt int_fast16_t , 62.Vt int_fast32_t , 63and 64.Vt int_fast64_t 65provide the fastest signed integer type with a width 66of at least 8, 16, 32, or 64 bits, respectively. 67The types 68.Vt uint_fast8_t , 69.Vt uint_fast16_t , 70.Vt uint_fast32_t , 71and 72.Vt uint_fast64_t 73provide the fastest unsigned integer type with a width 74of at least 8, 16, 32, or 64 bits, respectively. 75These types should be used when access speed is 76paramount, and when a specific size is not required. 77.Pp 78The types 79.Vt int_least8_t , 80.Vt int_least16_t , 81.Vt int_least32_t , 82and 83.Vt int_least64_t 84provide the smallest memory footprint signed integer type with 85a width of at least 8, 16, 32, or 64 bits, respectively. 86The types 87.Vt uint_least8_t , 88.Vt uint_least16_t , 89.Vt uint_least32_t , 90and 91.Vt uint_least64_t 92provide the smallest memory footprint unsigned integer type with 93a width of at least 8, 16, 32, or 64 bits, respectively. 94These types should be used when memory storage is of 95concern, and when a specific size is not required. 96.Pp 97The type 98.Vt intmax_t 99provides a signed integer type large 100enough to hold any other signed integer. 101The type 102.Vt uintmax_t 103provides an unsigned integer type large 104enough to hold any other unsigned integer. 105These types are generally the largest signed and unsigned 106integer types available on a specific architecture. 107.Pp 108The type 109.Vt intptr_t 110provides a signed integer type with the ability to hold a pointer to 111.Vt void , 112that can later be converted back to a pointer to 113.Vt void . 114and the result will compare equal to the original pointer. 115.Pp 116The type 117.Vt uintptr_t 118provides an unsigned integer type with the ability to hold a pointer to 119.Vt void , 120that can later be converted back to a pointer to 121.Vt void . 122and the result will compare equal to the original pointer. 123.Pp 124The 125.Fn INTX_C 126expands to an integer constant expression corresponding to the type 127.Vt int_leastX_t . 128The 129.Fn UINTX_C 130expands to an integer constant expression corresponding to the type 131.Vt uint_leastX_t . 132For example, 133.Fn UINT64_C 0x123 134expands to integer constant 135.Li 0x123ULL . 136.Pp 137The 138.Fn INTMAX_C 139macro expands to an integer constant expression having the value specified 140by its argument and the type 141.Vt intmax_t . 142The 143.Fn UINTMAX_C 144macro expands to an integer constant expression having the value specified 145by its argument and the type 146.Vt uintmax_t . 147.Sh STANDARDS 148The 149.In stdint.h 150header conforms to 151.St -isoC-99 152and 153.St -p1003.1-2001 . 154