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.Dd September 15, 2002 26.Dt STDINT 7 27.Os 28.Sh NAME 29.Nm stdint 30.Nd "standard integer types" 31.Sh SYNOPSIS 32.In stdint.h 33.Sh DESCRIPTION 34The 35.In stdint.h 36header provides source-portable integer types of a specific 37size, smallest memory footprint with a minimum size, fastest 38access speed with a minimum size, largest integer size, and 39those capable of storing pointers. 40.Pp 41The types 42.Vt int8_t , 43.Vt int16_t , 44.Vt int32_t , 45and 46.Vt int64_t 47provide a signed integer type of width 8, 16, 32, or 64 bits, respectively. 48The types 49.Vt uint8_t , 50.Vt uint16_t , 51.Vt uint32_t , 52and 53.Vt uint64_t 54provide an unsigned integer type of width 8, 16, 32, or 64 bits, respectively. 55These integer types should be used when a specific size is required. 56.Pp 57The types 58.Vt int_fast8_t , 59.Vt int_fast16_t , 60.Vt int_fast32_t , 61and 62.Vt int_fast64_t 63provide the fastest signed integer type with a width 64of at least 8, 16, 32, or 64 bits, respectively. 65The types 66.Vt uint_fast8_t , 67.Vt uint_fast16_t , 68.Vt uint_fast32_t , 69and 70.Vt uint_fast64_t 71provide the fastest unsigned integer type with a width 72of at least 8, 16, 32, or 64 bits, respectively. 73These types should be used when access speed is 74paramount, and when a specific size is not required. 75.Pp 76The types 77.Vt int_least8_t , 78.Vt int_least16_t , 79.Vt int_least32_t , 80and 81.Vt int_least64_t 82provide the smallest memory footprint signed integer type with 83a width of at least 8, 16, 32, or 64 bits, respectively. 84The types 85.Vt uint_least8_t , 86.Vt uint_least16_t , 87.Vt uint_least32_t , 88and 89.Vt uint_least64_t 90provide the smallest memory footprint unsigned integer type with 91a width of at least 8, 16, 32, or 64 bits, respectively. 92These types should be used when memory storage is of 93concern, and when a specific size is not required. 94.Pp 95The type 96.Vt intmax_t 97provides a signed integer type large 98enough to hold any other signed integer. 99The type 100.Vt uintmax_t 101provides an unsigned integer type large 102enough to hold any other unsigned integer. 103These types are generally the largest signed and unsigned 104integer types available on a specific architecture. 105.Pp 106The type 107.Vt intptr_t 108provides a signed integer type with the ability to hold a pointer to 109.Vt void , 110that can later be converted back to a pointer to 111.Vt void . 112.Pp 113The type 114.Vt uintptr_t 115provides an unsigned integer type with the ability to hold a pointer to 116.Vt void , 117that can later be converted back to a pointer to 118.Vt void . 119.Pp 120Additionally, the 121.In stdint.h 122header defines some macros, but none of them are documented here. 123.Sh STANDARDS 124The 125.In stdint.h 126header conforms to 127.St -isoC-99 128and 129.St -p1003.1-2001 . 130.Sh HISTORY 131The 132.In stdint.h 133header was first introduced in 134.Fx 5.0 . 135