1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)atoi.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/lib/libc/stdlib/atoi.3,v 1.14 2007/10/19 06:23:39 davidxu Exp $ 34.\" $DragonFly: src/lib/libc/stdlib/atoi.3,v 1.2 2003/06/17 04:26:46 dillon Exp $ 35.\" 36.Dd June 4, 1993 37.Dt ATOI 3 38.Os 39.Sh NAME 40.Nm atoi 41.Nd convert 42.Tn ASCII 43string to integer 44.Sh LIBRARY 45.Lb libc 46.Sh SYNOPSIS 47.In stdlib.h 48.Ft int 49.Fn atoi "const char *nptr" 50.Sh DESCRIPTION 51The 52.Fn atoi 53function converts the initial portion of the string pointed to by 54.Fa nptr 55to 56.Vt int 57representation. 58.Pp 59It is equivalent to: 60.Bd -literal -offset indent 61(int)strtol(nptr, NULL, 10); 62.Ed 63.Pp 64The 65.Fn atoi 66function has been deprecated by 67.Fn strtol 68and should not be used in new code. 69.Sh ERRORS 70The function 71.Fn atoi 72need not affect the value of 73.Va errno 74on an error. 75.Sh SEE ALSO 76.Xr atof 3 , 77.Xr atol 3 , 78.Xr strtod 3 , 79.Xr strtol 3 , 80.Xr strtoul 3 81.Sh STANDARDS 82The 83.Fn atoi 84function conforms to 85.St -p1003.1-90 , 86.St -isoC , 87and 88.St -isoC-99 . 89